This page has only limited features, please log in for full access.

Unclaimed
Haijun Zhou
Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 24 July 2021 in Engineering Structures
Reads 0
Downloads 0

NiTi Shape Memory Alloy (SMA) has the potential for use as cross-ties to mitigate cable vibration due to its superelasticity and high damping capacity. However, recent studies revealed that the fatigue problem of the NiTi SMA should be addressed. This paper investigates the fatigue characteristic of SMA strands. The superelastic and structural fatigue characteristics of SMA strands were tested under uniaxial cyclic tensile loading at different strain amplitudes. The maximum stress, residual strain, and dissipated energy were derived from a superplastic fatigue test with 2000 cycles. The test results showed that the parameter values related to the superelastic behavior of the SMA strand decreased in the early stage and then stabilized. A structural fatigue test conducted at strain amplitudes of 0.3% to 2.5% indicated that the structural fatigue life of the SMA strand decreased with increasing strain amplitude; the fatigue life reached two million cycles at the strain amplitude of 0.3%. The free vibration test result indicated that the SMA cross-tie significantly increased the frequency and moderately increased the damping ratio of the cable net. An optimal cross-tie location existed in each vibration mode with the maximum damping ratio.

ACS Style

Xia Yang; Haijun Zhou; Xin Yang; Xianbao Zhou; Sara Ying Zhang; Yanliang Du. Shape memory alloy strands as cross-ties: Fatigue behavior and model-cable net tests. Engineering Structures 2021, 245, 112828 .

AMA Style

Xia Yang, Haijun Zhou, Xin Yang, Xianbao Zhou, Sara Ying Zhang, Yanliang Du. Shape memory alloy strands as cross-ties: Fatigue behavior and model-cable net tests. Engineering Structures. 2021; 245 ():112828.

Chicago/Turabian Style

Xia Yang; Haijun Zhou; Xin Yang; Xianbao Zhou; Sara Ying Zhang; Yanliang Du. 2021. "Shape memory alloy strands as cross-ties: Fatigue behavior and model-cable net tests." Engineering Structures 245, no. : 112828.

Journal article
Published: 22 April 2021 in Powder Technology
Reads 0
Downloads 0

Magnesium phosphate cement (MPC) has been applied in grouting engineering due to its features of quick setting, high early-strength, and perfect volume stability. The rheological properties (RPs) of MPC, being vitally important for site operation, need to be studied further. Sodium tripolyphosphate (STP) is one type of high-efficiency retarders used in MPC. This study investigated the effects of STP content on the RPs of MPC pastes, and the mechanisms were studied by characterizing the zeta potential, 1H NMR relaxation signal, water film thickness, mineral changes, and electrical impedance. Experimental results indicate that the plastic viscosity (η) increases gradually and the yield stress (τ0) decreases firstly and then increases with increasing the STP content. The influencing mechanisms of STP need to be distinguished by analyzing η and τ0 respectively. The water film thickness and the amount of intermediate hydration products within 15 min of hydration is directly related to the change in η. The porosity and distribution of free water obtained from 1H NMR in MPC slurry are the dominant factor for τ0, and followed by the diffused double layer. It is noteworthy that zeta potential is not an effective measure for studying the RPs of MPC. Results of electrical impedance also explain the mechanisms of STP retarding the hydration and improving the early-term strength of MPC.

ACS Style

Cong Ma; Yuantao Liu; Haijun Zhou; Fuqiang He; Yange Li; Weixin Ren; Yanliang Du. Influencing mechanism of sodium tripolyphosphate on the rheological properties of magnesium phosphate cement. Powder Technology 2021, 387, 406 -414.

AMA Style

Cong Ma, Yuantao Liu, Haijun Zhou, Fuqiang He, Yange Li, Weixin Ren, Yanliang Du. Influencing mechanism of sodium tripolyphosphate on the rheological properties of magnesium phosphate cement. Powder Technology. 2021; 387 ():406-414.

Chicago/Turabian Style

Cong Ma; Yuantao Liu; Haijun Zhou; Fuqiang He; Yange Li; Weixin Ren; Yanliang Du. 2021. "Influencing mechanism of sodium tripolyphosphate on the rheological properties of magnesium phosphate cement." Powder Technology 387, no. : 406-414.

Journal article
Published: 02 April 2021 in Journal of Building Engineering
Reads 0
Downloads 0

In comparison to other accelerating curing methods in cement-based materials, the direct electric curing (DEC) has unique advantages of easily operating and high-quality controlling. Through employing the fixed voltage and frequency of alternating current, the influence of DEC time ranging from 0 to 24 hours on Portland cement was investigated. The optimal DEC time was proposed by measuring the flexural strength, compressive strength, pore structure, capillary water absorption. The influencing mechanism of DEC on the properties of cement was studied by using TGA and XRD analysis. This study also compared the potential CO2 emission of four methods for preparing high early-strength cement-based materials. The results indicate that short time, i.e., within 2 hours, of DEC cannot improve both early-term and middle-term strength. The optimal DEC time is about 6 hours, through which the increment in 1-day and 28-day strength, improvement of pore structure and capillary water absorption can be obtained. Superfluous DEC decreases the middle-term strength and makes the pore structure much coarser because delayed ettringite formation (DEF) was observed in 24 hours of DEC cured specimens. Judged only by strength requirement, DEC is indeed much cleaner than steam curing, but it has no advantage over the methods of Portland cement with composite early-strength agent or Portland cement with sulphoaluminate cement. While considering CO2 emission, cost, durability and strength requirement together, DEC is the most effective and environmentally friendly method.

ACS Style

Cong Ma; Jiahua Peng; Haijun Zhou; Rui Zhou; Weixin Ren; Yanliang Du. An effective method for preparing high early-strength cement-based materials: The effects of direct electric curing on Portland cement. Journal of Building Engineering 2021, 43, 102485 .

AMA Style

Cong Ma, Jiahua Peng, Haijun Zhou, Rui Zhou, Weixin Ren, Yanliang Du. An effective method for preparing high early-strength cement-based materials: The effects of direct electric curing on Portland cement. Journal of Building Engineering. 2021; 43 ():102485.

Chicago/Turabian Style

Cong Ma; Jiahua Peng; Haijun Zhou; Rui Zhou; Weixin Ren; Yanliang Du. 2021. "An effective method for preparing high early-strength cement-based materials: The effects of direct electric curing on Portland cement." Journal of Building Engineering 43, no. : 102485.

Journal article
Published: 01 April 2021 in Construction and Building Materials
Reads 0
Downloads 0

Magnesium phosphate cement (MPC) has been used as grouting materials with unique advantages of quick setting and high early strength. The rheological properties (RPs) of MPC, being vitally crucial for site operation, need to be studied further. This study added fly ash (FA) and silica fume (SF) into MPC to prepare MPC-FA and MPC-SF pastes, and the RPs were measured. The influencing mechanisms of FA and SF on the RPs were studied by measuring the zeta potential, hydration heat, 1H nuclear magnetic resonance (NMR) relaxation signal, water film thickness, and mineral changes. Experimental results indicate that the rheological parameters can also be analyzed by using the Bingham model. FA and SF increase the yield stress (τ0), but they have different effects on plastic viscosity (η). The η value increases remarkably with an increased FA content, and it decreases slightly when increasing the SF content. The mechanisms of FA and SF on RPs of MPC can be explained from three aspects, i.e., hydration process, water film thickness and zeta potential. FA accelerates the hydration and makes the inflection points of 1H NMR relaxation signal sharply ahead of schedule. The decrease in free water reduces the water film thickness among solid particles correspondingly. Likewise, the presence of FA decreases the zeta potential value significantly. Hydration is the most important factor for the rheological behavior of MPC paste, followed by the separation distance of the particles and followed by the surface charge.

ACS Style

Cong Ma; Yuantao Liu; Haijun Zhou; Zhengwu Jiang; Weixin Ren; Fuqiang He. Influencing mechanism of mineral admixtures on rheological properties of fresh magnesium phosphate cement. Construction and Building Materials 2021, 288, 123130 .

AMA Style

Cong Ma, Yuantao Liu, Haijun Zhou, Zhengwu Jiang, Weixin Ren, Fuqiang He. Influencing mechanism of mineral admixtures on rheological properties of fresh magnesium phosphate cement. Construction and Building Materials. 2021; 288 ():123130.

Chicago/Turabian Style

Cong Ma; Yuantao Liu; Haijun Zhou; Zhengwu Jiang; Weixin Ren; Fuqiang He. 2021. "Influencing mechanism of mineral admixtures on rheological properties of fresh magnesium phosphate cement." Construction and Building Materials 288, no. : 123130.

Journal article
Published: 24 February 2021 in Construction and Building Materials
Reads 0
Downloads 0

Magnesium phosphate cement (MPC) with unique advantages of quick setting and high early-strength has been used as grouting materials. The rheological properties of MPC, being vitally important for site operation, need to be studied further. Dead burnt magnesia (MgO) and phosphate (ADP) are the main raw materials for preparing MPC. This study measured the rheological properties with different M/P ratios, and the mechanisms of M/P ratio were studied by characterizing the zeta potential, 1H NMR relaxation signal, water film thickness, mineral changes and electrical impedance. Experimental results indicate that both the yield stress (τ0) and plastic viscosity (η) decrease firstly and then increase gradually with increasing the M/P ratio from 2.5:1 to 4.5:1. Higher M/P ratio decreases the interparticle water film thickness and accelerates the initial hydration rate remarkably, which is responsible for the change in rheological parameters. Low field NMR, TG-DTG analysis and Nyquist plots confirm the quicker initial hydration in MPC with higher M/P ratio. The change in hydration products is very slight during the rheological property measurements. Nyquist plots show that the MPC paste with lower M/P ratios has more compact microstructure and lower porosity at several hours. In a word, initial hydration rate is the most important factor influencing the rheological properties of MPC, and the separation distance among solid particles is the secondary factor.

ACS Style

Cong Ma; Gege Chen; Zhengwu Jiang; Haijun Zhou; Hao Yao; Rui Zhou; Weixin Ren. Rheological properties of magnesium phosphate cement with different M/P ratios. Construction and Building Materials 2021, 282, 122657 .

AMA Style

Cong Ma, Gege Chen, Zhengwu Jiang, Haijun Zhou, Hao Yao, Rui Zhou, Weixin Ren. Rheological properties of magnesium phosphate cement with different M/P ratios. Construction and Building Materials. 2021; 282 ():122657.

Chicago/Turabian Style

Cong Ma; Gege Chen; Zhengwu Jiang; Haijun Zhou; Hao Yao; Rui Zhou; Weixin Ren. 2021. "Rheological properties of magnesium phosphate cement with different M/P ratios." Construction and Building Materials 282, no. : 122657.

Research article
Published: 23 November 2020 in SN Applied Sciences
Reads 0
Downloads 0

In this paper, the records of steel bar mechanical behavior that are similar to condition-specific data are sifted from the corroded steel bar database based on a similarity measure method. The similarity of mechanical behavior between the corroded steel bar database and the corroded steel samples under certain conditions are analyzed by the similarity measure S. The sifted records can be used for linear regression analysis and combined with limited condition-specific data to obtain a larger coefficient of determination \(R^{2}\) as there are more similar steel bar corrosion characteristics that are relevant to the condition-specific data. It is found that nearly all of the sifted records in the database share the same certain conditions which are similar to the condition-specific data.

ACS Style

Haijun Zhou; Zhiheng Zhong; Zhiyao Lin; Jian Liu; Feng Xing. Re-analyzing the mechanical properties of corroded steel bar based on similarity measure. SN Applied Sciences 2020, 2, 1 -13.

AMA Style

Haijun Zhou, Zhiheng Zhong, Zhiyao Lin, Jian Liu, Feng Xing. Re-analyzing the mechanical properties of corroded steel bar based on similarity measure. SN Applied Sciences. 2020; 2 (12):1-13.

Chicago/Turabian Style

Haijun Zhou; Zhiheng Zhong; Zhiyao Lin; Jian Liu; Feng Xing. 2020. "Re-analyzing the mechanical properties of corroded steel bar based on similarity measure." SN Applied Sciences 2, no. 12: 1-13.

Journal article
Published: 03 September 2020 in Materials
Reads 0
Downloads 0

Chloride-induced steel corrosion is the most concerning issue for the durability of concrete structures. Concrete and steel samples were obtained from a 30-year-old reinforced concrete bridge. The chloride content was measured by a potentiometric titration method and the microstructure of concrete was obtained by scanning electron microscopy and mercury intrusion porosimetry. The rust phases of the steel were detected by X-ray diffraction and Raman analysis. It was found that the convection depth for chloride transport in cracked concrete was significantly larger than that in uncracked concrete. The concrete in a pier column facing upstream had greater porosity due to the water impact and calcium leaching. The coefficients of variability of chloride diffusivity of concrete for the bridge deck and the pier column were significantly different. Rust phases including lepidocrocite, goethite, akaganeite, magnetite, and maghemite were detected using Raman spectroscopy and X-ray diffraction. The major phases of steel rust in the atmospheric zone were lepidocrocite and goethite, while they were lepidocrocite and maghemite in the tidal zone. The results of this study would provide information concerning the chloride-induced steel corrosion under a marine environment in order to predict long-term behaviors of a reinforced concrete structure.

ACS Style

Jun Liu; Zhilu Jiang; Yulong Zhao; Hao Zhou; Xiaodong Wang; Haijun Zhou; Feng Xing; Shanglin Li; Jihua Zhu; Wei Liu. Chloride Distribution and Steel Corrosion in a Concrete Bridge after Long-Term Exposure to Natural Marine Environment. Materials 2020, 13, 3900 .

AMA Style

Jun Liu, Zhilu Jiang, Yulong Zhao, Hao Zhou, Xiaodong Wang, Haijun Zhou, Feng Xing, Shanglin Li, Jihua Zhu, Wei Liu. Chloride Distribution and Steel Corrosion in a Concrete Bridge after Long-Term Exposure to Natural Marine Environment. Materials. 2020; 13 (17):3900.

Chicago/Turabian Style

Jun Liu; Zhilu Jiang; Yulong Zhao; Hao Zhou; Xiaodong Wang; Haijun Zhou; Feng Xing; Shanglin Li; Jihua Zhu; Wei Liu. 2020. "Chloride Distribution and Steel Corrosion in a Concrete Bridge after Long-Term Exposure to Natural Marine Environment." Materials 13, no. 17: 3900.

Journal article
Published: 25 August 2020 in Advances in Engineering Software
Reads 0
Downloads 0

Missing time series data in a structural health monitoring system remains a problem in some real-time applications, such as the calculation of cable force. To solve this problem, several algorithms have been proposed to impute missing data. However, studies on extracting temporal correlations from different dimensions to improve imputation have rarely been conducted. In this study, a matrix containing correlations between days and within one day is constructed, and an amputation method based on principal component analysis (PCA) is extended to reconstruct the matrix. We extend PCA in the form of probability—that is, probabilistic principal component analysis (PPCA) to avoid overfitting. The performance of the proposed method is systematically evaluated in two different scenarios: random missing data scenario and continuous missing data scenario. The results indicate that fully extracting temporal correlations from measured values can improve the estimation of missing values. PPCA also outperforms PCA in two scenarios, particularly the continuous missing data scenario, suggesting that the probability framework can enhance the accuracy of imputation. Thus, the imputation errors can be markedly improved if temporal correlations from different dimensions are appropriately considered.

ACS Style

Linchao Li; Hanlin Liu; Haijun Zhou; ChaoDong Zhang. Missing data estimation method for time series data in structure health monitoring systems by probability principal component analysis. Advances in Engineering Software 2020, 149, 102901 .

AMA Style

Linchao Li, Hanlin Liu, Haijun Zhou, ChaoDong Zhang. Missing data estimation method for time series data in structure health monitoring systems by probability principal component analysis. Advances in Engineering Software. 2020; 149 ():102901.

Chicago/Turabian Style

Linchao Li; Hanlin Liu; Haijun Zhou; ChaoDong Zhang. 2020. "Missing data estimation method for time series data in structure health monitoring systems by probability principal component analysis." Advances in Engineering Software 149, no. : 102901.

Research article
Published: 04 July 2020 in Structural Health Monitoring
Reads 0
Downloads 0

Missing data, especially a block of missing data, inevitably occur in structural health monitoring systems. Because of their severe negative effects, many methods that use measured data to infer missing data have been proposed in previous research to solve the problem. However, capturing complex correlations from raw measured signal data remains a challenge. In this study, empirical mode decomposition is combined with a long short-term memory deep learning network for the recovery of the measured signal data. The proposed hybrid method converts the missing data imputation task as a time series prediction task, which is then solved by a “divide and conquer” strategy. The core concept of this strategy is the prediction of the subsequences of the raw measured signal data, which are decomposed by empirical mode decomposition rather than directly predicted, as the decomposition can assist in the modeling of the irregular periodic changes of the measured signal data. In addition, the long short-term memory network in the hybrid model can remember more long-range correlations of subsequences than can the traditional artificial neural network. Three widely used prediction models, namely, the autoregressive integrated moving average, support vector regression, and artificial neural network models, are also implemented as benchmark models. Raw acceleration data collected from a cable-stayed bridge are used to evaluate the performance of the proposed method for missing measured signal data imputation. The recovery results of the measured signal data demonstrate that the proposed hybrid method exhibits excellent performance from two perspectives. First, the decomposition by empirical mode decomposition can improve the accuracy of the core long short-term memory prediction model. Second, the long short-term memory model outperforms other benchmark models because it can fit more microscopic changes of measured values. The experiments conducted in this study also suggest that the change patterns of raw measured signal data are complex, and it is therefore important to extract the features before modeling.

ACS Style

Linchao Li; Haijun Zhou; Hanlin Liu; ChaoDong Zhang; Junhui Liu. A hybrid method coupling empirical mode decomposition and a long short-term memory network to predict missing measured signal data of SHM systems. Structural Health Monitoring 2020, 1 .

AMA Style

Linchao Li, Haijun Zhou, Hanlin Liu, ChaoDong Zhang, Junhui Liu. A hybrid method coupling empirical mode decomposition and a long short-term memory network to predict missing measured signal data of SHM systems. Structural Health Monitoring. 2020; ():1.

Chicago/Turabian Style

Linchao Li; Haijun Zhou; Hanlin Liu; ChaoDong Zhang; Junhui Liu. 2020. "A hybrid method coupling empirical mode decomposition and a long short-term memory network to predict missing measured signal data of SHM systems." Structural Health Monitoring , no. : 1.

Journal article
Published: 10 June 2020 in Engineering Failure Analysis
Reads 0
Downloads 0

This paper presents a case study on the failure of a reinforced concrete bridge due to marine environment corrosion in eastern Shenzhen, China. Over approximately 20 years, the concrete of the bridge pier had become cracked and spalled, and the stirrups were fractured due to the corrosion. Inspection and assessment of the concrete strength, cover depth, carbonation depth, and corrosion potential is carried out in this work. A sample of 29 corroded steel bars and 13 corroded stirrups collected from the bridge are also investigated for corrosion mass loss and mechanical testing in the laboratory. Findings show that the mechanical parameters of the corroded steel bars are gradually degraded with the increase of mass loss ratio. The chloride ion profile of the bridge structure concrete is also analyzed.

ACS Style

Haijun Zhou; Siyu Chen; Yanliang Du; Zhiyao Lin; Xuebing Liang; Jun Liu; Feng Xing. Field test of a reinforced concrete bridge under marine environmental corrosion. Engineering Failure Analysis 2020, 115, 104669 .

AMA Style

Haijun Zhou, Siyu Chen, Yanliang Du, Zhiyao Lin, Xuebing Liang, Jun Liu, Feng Xing. Field test of a reinforced concrete bridge under marine environmental corrosion. Engineering Failure Analysis. 2020; 115 ():104669.

Chicago/Turabian Style

Haijun Zhou; Siyu Chen; Yanliang Du; Zhiyao Lin; Xuebing Liang; Jun Liu; Feng Xing. 2020. "Field test of a reinforced concrete bridge under marine environmental corrosion." Engineering Failure Analysis 115, no. : 104669.

Journal article
Published: 25 January 2020 in Materials
Reads 0
Downloads 0

NiTi Shape Memory Alloy (SMA) has been widely studied in the field of structural vibration control, and the results show that the fatigue life of the SMA is a key factor of the vibration control system. In this paper, the fatigue test is carried out in Dynamic Mechanical Analyzer (DMA + 1000) to analyze how the changes of temperature and strain amplitude affecting the main fatigue parameters. The test results show that when the test temperature is higher than Austenite finish temperature (Af), the fatigue properties of SMAs are significantly affected by temperature. With the increase of temperature, the fatigue life becomes shorter and the energy consumption decreases, while the area of hysteresis curve, the stress amplitude, and effective modulus increase.

ACS Style

Caikui Lin; Zeqiang Wang; Xin Yang; Haijun Zhou. Experimental Study on Temperature Effects on NiTi Shape Memory Alloys under Fatigue Loading. Materials 2020, 13, 573 .

AMA Style

Caikui Lin, Zeqiang Wang, Xin Yang, Haijun Zhou. Experimental Study on Temperature Effects on NiTi Shape Memory Alloys under Fatigue Loading. Materials. 2020; 13 (3):573.

Chicago/Turabian Style

Caikui Lin; Zeqiang Wang; Xin Yang; Haijun Zhou. 2020. "Experimental Study on Temperature Effects on NiTi Shape Memory Alloys under Fatigue Loading." Materials 13, no. 3: 573.

Journal article
Published: 20 January 2020 in Probabilistic Engineering Mechanics
Reads 0
Downloads 0

A methodology is proposed for efficient and accurate modeling and simulation of correlated non-Gaussian wind velocity time histories along long-span structures at an arbitrarily large number of points. Currently, the most common approach is to model wind velocities as discrete components of a stochastic vector process, characterized by a Cross-Spectral Density Matrix (CSDM). To generate sample functions of the vector process, the Spectral Representation Method is one of the most commonly used, involving a Cholesky decomposition of the CSDM. However, it is a well-documented problem that as the length of the structure – and consequently the size of the vector process – increases, this Cholesky decomposition breaks down numerically. This paper extends a methodology introduced by the second and fourth authors to model wind velocities as a Gaussian stochastic wave (continuous in both space and time) by considering the stochastic wave to be non-Gaussian. The non-Gaussian wave is characterized by its frequency–wavenumber (FK) spectrum and marginal probability density function (PDF). This allows the non-Gaussian wind velocities to be modeled at a virtually infinite number of points along the length of the structure. The compatibility of the FK spectrum and marginal PDF according to translation process theory is secured using an extension of the Iterative Translation Approximation Method introduced by the second and third authors, where the underlying Gaussian FK spectrum is upgraded iteratively using the directly computed (through translation process theory) non-Gaussian FK spectrum. After a small number of computationally extremely efficient iterations, the underlying Gaussian FK spectrum is established and generation of non-Gaussian sample functions of the stochastic wave is straightforward without the need of iterations. Numerical examples are provided demonstrating that the simulated non-Gaussian wave samples exhibit the desired spectral and marginal PDF characteristics.

ACS Style

Haijun Zhou; George Deodatis; Michael Shields; Brett Benowitz. Simulation of wind velocity time histories on long span structures modeled as non-Gaussian stochastic waves. Probabilistic Engineering Mechanics 2020, 59, 103016 .

AMA Style

Haijun Zhou, George Deodatis, Michael Shields, Brett Benowitz. Simulation of wind velocity time histories on long span structures modeled as non-Gaussian stochastic waves. Probabilistic Engineering Mechanics. 2020; 59 ():103016.

Chicago/Turabian Style

Haijun Zhou; George Deodatis; Michael Shields; Brett Benowitz. 2020. "Simulation of wind velocity time histories on long span structures modeled as non-Gaussian stochastic waves." Probabilistic Engineering Mechanics 59, no. : 103016.

Journal article
Published: 09 December 2019 in Applied Sciences
Reads 0
Downloads 0

Wind characteristics (e.g., mean wind speed, gust factor, turbulence intensity and integral scale, etc.) are quite scattered in different measurement conditions, especially during typhoon and/or hurricane processes, which results in the structural engineer ambiguously determining the wind parameters in wind-resistant design of buildings and structures in cyclone-prone regions. In tropical cyclones (including typhoons and hurricanes), the inconsistent wind characteristics may be in part ascribed to the complex flow structure with the coexistence of both mechanical and convective turbulence in the boundary layer of tropical cyclones. Another significant contribution to the scattered wind characteristics is due to various measurement conditions (e.g., terrain exposure and height) and data processing schemes (e.g., averaging time). The removal of the inconsistency in the field-measurement system may offer a more rational comparison of measured wind data from various observation platforms, and hence facilitates a better identification scheme of the wind characteristics to guide the urban planning design and wind-resistant design of buildings and structures. In this study, an analytical framework was firstly proposed to eliminate the potential observation-related effects in wind characteristics and then the wind characteristics of seven field measured tropical cyclones (four typhoons and three hurricanes) were comparatively investigated. Specifically, field measurements of wind characteristics were converted to a standard reference station with a roughness length of 0.03 m, observation duration of 10 min for mean wind and averaging time of 3 s for gusty wind at a 10 m height. The differences of the measured wind characteristics between the typhoons and hurricanes were highlighted. The standardized turbulent wind characteristics under the analytical framework for typhoons and hurricanes were compared with the corresponding recommendations in standard of American Society of Civil Engineers (ASCE 7-10) and Architectural Institute of Japan Recommendations for Loads on Buildings (AIJ-RLB-2004).

ACS Style

Lixiao Li; Yizhuo Zhou; Haifeng Wang; Haijun Zhou; Xuhui He; And Teng Wu; Zhou. An Analytical Framework for the Investigation of Tropical Cyclone Wind Characteristics over Different Measurement Conditions. Applied Sciences 2019, 9, 5385 .

AMA Style

Lixiao Li, Yizhuo Zhou, Haifeng Wang, Haijun Zhou, Xuhui He, And Teng Wu, Zhou. An Analytical Framework for the Investigation of Tropical Cyclone Wind Characteristics over Different Measurement Conditions. Applied Sciences. 2019; 9 (24):5385.

Chicago/Turabian Style

Lixiao Li; Yizhuo Zhou; Haifeng Wang; Haijun Zhou; Xuhui He; And Teng Wu; Zhou. 2019. "An Analytical Framework for the Investigation of Tropical Cyclone Wind Characteristics over Different Measurement Conditions." Applied Sciences 9, no. 24: 5385.

Journal article
Published: 13 November 2019 in Engineering Structures
Reads 0
Downloads 0

Twelve reinforced concrete (RC) pier specimens were developed and partially corroded to simulate severe corrosion in splash and tidal zones. Six target corrosion levels were applied to rebars and stirrups using an electrochemical accelerated corrosion technique. Axial compression loading and cyclic loading tests were carried out with six specimens per group. The test results showed that mechanical parameters of pier specimens degraded with an increase in corrosion. The ultimate load, ductility factor, energy dissipation decreased by 29.96%, 9.26%, 67.44% for axial compression specimen with 15.82% rebar mass loss compared to those of intact specimen; for cyclic loading specimens, they decreased by 10.69%, 21.47%, 57.46% with 15.71% rebar mass loss, respectively. Comparative analysis showed that the difference for the degradation level of dimensionless parameters was not obvious between axial compression loading and cyclic loading tests. Findings also showed that for severely corroded specimens, the plastic hinge zone transferred from the bottom of RC piers to the splash and tidal zones. Although the extent of the degradation of the results between the published paper and this test shows significant variations; degradation of dimensionless energy dissipation was always the most serious one.

ACS Style

Haijun Zhou; Yanan Xu; Yanrong Peng; Xuebing Liang; Dawang Li; Feng Xing. Partially corroded reinforced concrete piers under axial compression and cyclic loading: An experimental study. Engineering Structures 2019, 203, 109880 .

AMA Style

Haijun Zhou, Yanan Xu, Yanrong Peng, Xuebing Liang, Dawang Li, Feng Xing. Partially corroded reinforced concrete piers under axial compression and cyclic loading: An experimental study. Engineering Structures. 2019; 203 ():109880.

Chicago/Turabian Style

Haijun Zhou; Yanan Xu; Yanrong Peng; Xuebing Liang; Dawang Li; Feng Xing. 2019. "Partially corroded reinforced concrete piers under axial compression and cyclic loading: An experimental study." Engineering Structures 203, no. : 109880.

Journal article
Published: 01 November 2019 in Composites Part B: Engineering
Reads 0
Downloads 0
ACS Style

Jian Song; Lu Liu; Lixiao Li; Haijun Zhou; Wenzhao Zhou; Xiang Li; Weidong Wen. Thermo-mechanical responses of notched layer-to-layer 3D angle-interlock woven composites. Composites Part B: Engineering 2019, 176, 1 .

AMA Style

Jian Song, Lu Liu, Lixiao Li, Haijun Zhou, Wenzhao Zhou, Xiang Li, Weidong Wen. Thermo-mechanical responses of notched layer-to-layer 3D angle-interlock woven composites. Composites Part B: Engineering. 2019; 176 ():1.

Chicago/Turabian Style

Jian Song; Lu Liu; Lixiao Li; Haijun Zhou; Wenzhao Zhou; Xiang Li; Weidong Wen. 2019. "Thermo-mechanical responses of notched layer-to-layer 3D angle-interlock woven composites." Composites Part B: Engineering 176, no. : 1.

Journal article
Published: 11 July 2019 in Structural Control and Health Monitoring
Reads 0
Downloads 0
ACS Style

Haijun Zhou; Xianbao Zhou; Guozao Yao; Limin Sun; Feng Xing. Free vibration of two taut cables interconnected by a damper. Structural Control and Health Monitoring 2019, 26, 1 .

AMA Style

Haijun Zhou, Xianbao Zhou, Guozao Yao, Limin Sun, Feng Xing. Free vibration of two taut cables interconnected by a damper. Structural Control and Health Monitoring. 2019; 26 (10):1.

Chicago/Turabian Style

Haijun Zhou; Xianbao Zhou; Guozao Yao; Limin Sun; Feng Xing. 2019. "Free vibration of two taut cables interconnected by a damper." Structural Control and Health Monitoring 26, no. 10: 1.

Research article
Published: 15 October 2018 in International Journal of Distributed Sensor Networks
Reads 0
Downloads 0

Wind loads are the dominant loads for large-scale buildings and structures in tropical cyclone-prone regions; however, wind characteristics in tropical cyclones are still far from being understood. In this study, wind characteristics concerned in engineering applications, for example, wind attack angle, friction velocity, drag coefficient, turbulence intensity, integral scale, gust factor, and peak factor, were carefully investigated based on field measurements in typhoon Hagupit and were compared with measurements in typhoon Maemi and three hurricanes in literatures. The results show that drag coefficient increases with mean wind speeds at low levels and then decreases gradually at wind speed greater than 22.45 m/s in typhoon Hagupit over sea surface; turbulence intensities in front-side eyewall region are greater than those in back-side eyewall regions both in typhoons and hurricanes; the ratio between longitudinal integral scale and lateral integral scale, [Formula: see text], is scattered, but the ratio between longitudinal integral scale and vertical integral scale, [Formula: see text], is closer both in typhoons and hurricanes; the gust factor in typhoon Hagupit is 1.25 over open sea surface and 1.42 over open flat terrain; the peak factor is about 2.4.

ACS Style

Lixiao Li; Yiqing Xiao; Haijun Zhou; Feng Xing; Lili Song. Turbulent wind characteristics in typhoon Hagupit based on field measurements. International Journal of Distributed Sensor Networks 2018, 14, 1 .

AMA Style

Lixiao Li, Yiqing Xiao, Haijun Zhou, Feng Xing, Lili Song. Turbulent wind characteristics in typhoon Hagupit based on field measurements. International Journal of Distributed Sensor Networks. 2018; 14 (10):1.

Chicago/Turabian Style

Lixiao Li; Yiqing Xiao; Haijun Zhou; Feng Xing; Lili Song. 2018. "Turbulent wind characteristics in typhoon Hagupit based on field measurements." International Journal of Distributed Sensor Networks 14, no. 10: 1.

Research article
Published: 23 August 2018 in Structural Control and Health Monitoring
Reads 0
Downloads 0

Recent numerical studies showed the combined effects of mass and viscous damper would behave like that of semiactive damper with “negative stiffness properties.” This paper analytically studied the characteristic equation of the cable‐mass‐damper system derived with help of the transfer matrix method. After the expansion of the complex frequency equation in terms of real and imaginary parts, the special limiting solutions are obtained, together with three different classified mode behaviors. Asymptotic approximate formulations for damper and concentrated mass close to the cable end are developed provided that both the nondimensional mass coefficient and the frequency shift between the free and damped cable system are small. The influences of the nondimensional mass coefficient and its location on the maximum cable vibration damping and the corresponding optimal damper constant are also studied as the damper is installed near the cable anchorage and the mass is moved along the cable axis. When the damper and concentrated mass are located at the same position, the mode behaviors are investigated in three regimes by means of varying the nondimensional mass coefficient. The general solutions for the arbitrary location of damper and concentrated mass along the cable axis are further discussed. It is found that the concentrated mass will significantly affect the system damping, especially when the concentrated mass and the damper are located at the same half wave of the mode shape.

ACS Style

Haijun Zhou; Xigui Huang; Ning Xiang; Jiawei He; Limin Sun; Feng Xing. Free vibration of a taut cable with a damper and a concentrated mass. Structural Control and Health Monitoring 2018, 25, e2251 .

AMA Style

Haijun Zhou, Xigui Huang, Ning Xiang, Jiawei He, Limin Sun, Feng Xing. Free vibration of a taut cable with a damper and a concentrated mass. Structural Control and Health Monitoring. 2018; 25 (11):e2251.

Chicago/Turabian Style

Haijun Zhou; Xigui Huang; Ning Xiang; Jiawei He; Limin Sun; Feng Xing. 2018. "Free vibration of a taut cable with a damper and a concentrated mass." Structural Control and Health Monitoring 25, no. 11: e2251.

Research article
Published: 02 July 2018 in International Journal of Corrosion
Reads 0
Downloads 0

Reinforcement corrosion is a major cause of degradation in reinforced concrete structures. The fragile rust layer and cracking and spalling of the cover caused by splitting stress due to rust expansion can alter bond behaviors significantly. Despite extensive experimental tests, no stochastic model has yet incorporated randomness into the bond parameters model. This paper gathered published experimental data on the bond-slip parameters of pull-out specimens and beam-end specimens. Regression analysis was carried out to identify the best fit of bond strength and the corresponding slip value in the context of different corrosion levels from the recollected test results. An F-test confirmed the regression effect to be significant. Residual data were also analyzed and found to be well described by a normal distribution. Crack width data of the tested specimens were also collected. A regression analysis of the bond strength and maximum crack width was carried out given the comparative simplicity of measuring crack width versus rebar area loss. Results indicate that maximum crack width can also be used to predict bond strength degradation with similar variation magnitude.

ACS Style

H. J. Zhou; Y. F. Zhou; Y. N. Xu; Z. Y. Lin; F. Xing; L. X. Li. Regression Analysis of Bond Parameters between Corroded Rebar and Concrete Based on Reported Test Data. International Journal of Corrosion 2018, 2018, 1 -18.

AMA Style

H. J. Zhou, Y. F. Zhou, Y. N. Xu, Z. Y. Lin, F. Xing, L. X. Li. Regression Analysis of Bond Parameters between Corroded Rebar and Concrete Based on Reported Test Data. International Journal of Corrosion. 2018; 2018 ():1-18.

Chicago/Turabian Style

H. J. Zhou; Y. F. Zhou; Y. N. Xu; Z. Y. Lin; F. Xing; L. X. Li. 2018. "Regression Analysis of Bond Parameters between Corroded Rebar and Concrete Based on Reported Test Data." International Journal of Corrosion 2018, no. : 1-18.

Conference paper
Published: 01 January 2018 in Proceedings of the 8th International Conference on Computational Stochastic Mechanics (CSM 8)
Reads 0
Downloads 0
ACS Style

George Deodatis; Haijun Zhou; Michael Shields; Brett Benowitz. Simulation of Wind Velocity Time Histories on Long Span Structures Modeled as Non-Gaussian Stochastic Waves. Proceedings of the 8th International Conference on Computational Stochastic Mechanics (CSM 8) 2018, 1 .

AMA Style

George Deodatis, Haijun Zhou, Michael Shields, Brett Benowitz. Simulation of Wind Velocity Time Histories on Long Span Structures Modeled as Non-Gaussian Stochastic Waves. Proceedings of the 8th International Conference on Computational Stochastic Mechanics (CSM 8). 2018; ():1.

Chicago/Turabian Style

George Deodatis; Haijun Zhou; Michael Shields; Brett Benowitz. 2018. "Simulation of Wind Velocity Time Histories on Long Span Structures Modeled as Non-Gaussian Stochastic Waves." Proceedings of the 8th International Conference on Computational Stochastic Mechanics (CSM 8) , no. : 1.