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Prof. Dr. Zheng Lu
Research Institute of Structural Engineering and Disaster Reduction, College of Civil Engineering, Tongji University, Shanghai, China

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0 Numerical Simulation
0 passive control
0 Shaking Table Test
0 seismic behavior
0 Tuned Mass Damper

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seismic performance
Numerical Simulation
Tuned Mass Damper
Shaking Table Test
Dynamic response
passive control
debris flow
structural control
seismic behavior
Seismic response

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Research article
Published: 11 May 2021 in Journal of Vibration and Control
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To mitigate the adverse structural responses, an improved version of the traditional tuned vibration absorber has been proposed based on the shape memory alloy spring, referred as the shape memory alloy-spring tuned vibration absorber. The finite element numerical models of the multi-degree-of-freedom structure (e.g., transmission tower) and shape memory alloy-spring tuned vibration absorber are developed by using the commercial software ANSYS, and the nonlinear behavior of the shape memory alloy spring is validated based on a previous experimental study. The damping mechanism of the shape memory alloy-spring tuned vibration absorber attached to a multi-degree-of-freedom structure under seismic excitations is investigated, and the nonlinear hysteretic behavior of the shape memory alloy spring is also discussed. The results show that the proposed damper has a two-stage damping mechanism, and its control performance is remarkable. Because the coupled system response is sensitive to the amplitude level, the optimal configuration of the shape memory alloy-spring tuned vibration absorber can be obtained by parametric analysis. Particularly, because of the nonlinear target energy transfer and transient resonance capture mechanism, the shape memory alloy-spring tuned vibration absorber exhibits stable control ability under different seismic waves, indicating a good stability in vibration control of a multi-degree-of-freedom system.

ACS Style

Zheng Lu; Kunjie Rong; Li Tian; Canxing Qiu; Jiang Du. Studies on the damping mechanism of shape memory alloy-spring tuned vibration absorber attached to a multi-degree-of-freedom structure. Journal of Vibration and Control 2021, 1 .

AMA Style

Zheng Lu, Kunjie Rong, Li Tian, Canxing Qiu, Jiang Du. Studies on the damping mechanism of shape memory alloy-spring tuned vibration absorber attached to a multi-degree-of-freedom structure. Journal of Vibration and Control. 2021; ():1.

Chicago/Turabian Style

Zheng Lu; Kunjie Rong; Li Tian; Canxing Qiu; Jiang Du. 2021. "Studies on the damping mechanism of shape memory alloy-spring tuned vibration absorber attached to a multi-degree-of-freedom structure." Journal of Vibration and Control , no. : 1.

Technical paper
Published: 06 April 2021 in Structural Concrete
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A new type of connection between shear walls is proposed for the shear wall with precast concrete hollow molds (PCHM). The overlapping reinforcements are inserted into the PCHM before pouring concrete into the hollow in this method. Full‐scale test specimens are tested under low cyclic loading test to analyze their seismic performance, such as failure modes, hysteretic characters, stiffness degradation, energy dissipation, and ductility. For the precast specimen, although the penetrating crack appears at the horizontal connection, there is no large slippage leading to anchorage failure and disengagement of interfaces. Generally, compared with cast‐in‐situ shear walls, shear walls with PCHM have no large difference in bearing capacity, failure mode, stiffness degradation, energy dissipation and ductility. Therefore, the proposed shear wall with the new type of connection method is worth popularizing and utilizing in practical engineering projects with similar design procedure to cast‐in‐situ structures.

ACS Style

Xin Zhang; Yan Wang; Zheng Lu; Yao Yuan. Experimental study on seismic performance of shear wall with precast concrete hollow molds. Structural Concrete 2021, 22, 1445 -1461.

AMA Style

Xin Zhang, Yan Wang, Zheng Lu, Yao Yuan. Experimental study on seismic performance of shear wall with precast concrete hollow molds. Structural Concrete. 2021; 22 (3):1445-1461.

Chicago/Turabian Style

Xin Zhang; Yan Wang; Zheng Lu; Yao Yuan. 2021. "Experimental study on seismic performance of shear wall with precast concrete hollow molds." Structural Concrete 22, no. 3: 1445-1461.

Research article
Published: 17 March 2021 in The Structural Design of Tall and Special Buildings
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This paper puts forward a new type of the precast hollow shear wall. Focusing on seismic performance, the low‐frequency cyclic loading tests of five precast specimens and two cast‐in‐situ specimens in full size are conducted for comparison. The yielding and failure mechanism of specimens are analyzed and compared. The reliability of the vertical connection of precast hollow shear wall structure under the seismic effect is studied. The effects of axial compression ratio, single reinforcement connection in the central part, and confined stirrup for lapped reinforcements in boundary elements are also tested through experiments. The result shows that the failure mechanism of the precast specimen is basically same as the cast‐in‐situ specimen. The hysteretic curve of the precast specimen is plumper. And the energy dissipation capacity of precast specimen is superior to that of cast‐in‐situ specimen. In addition, the experimental data show that the buckled stirrup encryption for lapped steel in boundary elements will not increase the seismic performance of the proposed precast specimen. On the whole, the seismic performance of the proposed precast hollow shear wall can meet the safety requirements. Hence, it can be used in actual engineering project replacing cast‐in‐situ shear wall.

ACS Style

Xin Zhang; Xiangqian Liu; Zheng Lu; Jiarong Xu. Experimental study on seismic performance of precast hollow shear walls. The Structural Design of Tall and Special Buildings 2021, 30, e1856 .

AMA Style

Xin Zhang, Xiangqian Liu, Zheng Lu, Jiarong Xu. Experimental study on seismic performance of precast hollow shear walls. The Structural Design of Tall and Special Buildings. 2021; 30 (9):e1856.

Chicago/Turabian Style

Xin Zhang; Xiangqian Liu; Zheng Lu; Jiarong Xu. 2021. "Experimental study on seismic performance of precast hollow shear walls." The Structural Design of Tall and Special Buildings 30, no. 9: e1856.

Journal article
Published: 24 February 2021 in Structures
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This paper takes common masonry structures built in mountainous areas prone to debris flow as a research object and proposes carbon fiber-reinforced polymer (CFRP) to improve the resistance of the structures under debris flow impacts. According to a series of impact loading tests on an unreinforced model (hereinafter referred to as UM) and a CFRP-strengthened model (hereinafter referred to as CM), dynamic responses and failure mechanisms of these two structures under debris flow impacts are analyzed. To simulate the impact of large boulders in debris flows, steel balls with different diameters are placed on a loading device, and they roll down along the track from different heights to input homologous impact energy to the scaled models. The test results reveal that the maximum peak acceleration of the CM is only 51.3% of that of the UM, and the peak displacement of the CM is 50% of that of the UM, while the residual displacement is 65% of that of the UM (under the loading case G6 in this paper). When the models reach the serviceability limit state (defined in this paper), the absorbed impact energy of the CM is 7.35 times that of the UM. The test results show that CFRP is an effective reinforcement material to significantly improve structural bearing capacity and reduce dynamic response of structures under debris flow impacts. This study will be helpful for building construction and reinforcement in mountainous areas prone to debris flow impact.

ACS Style

Peizhen Li; Shiran Xu; Zheng Lu; Jin Li. Experimental study on the performance of CFRP-strengthened masonry structures under debris flow impacts. Structures 2021, 31, 602 -612.

AMA Style

Peizhen Li, Shiran Xu, Zheng Lu, Jin Li. Experimental study on the performance of CFRP-strengthened masonry structures under debris flow impacts. Structures. 2021; 31 ():602-612.

Chicago/Turabian Style

Peizhen Li; Shiran Xu; Zheng Lu; Jin Li. 2021. "Experimental study on the performance of CFRP-strengthened masonry structures under debris flow impacts." Structures 31, no. : 602-612.

Journal article
Published: 01 February 2021 in Journal of Structural Engineering
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In this paper, an innovative low-yield-point corrugated steel plate damper (LCSPD) was proposed, which consisted of two corrugated webs as the shear component and two outer corrugated plates as the bending component. Four LCSPDs were studied by varying the corrugation directions and arrangement forms. The lateral strength, energy dissipation, ductility, hysteretic behavior, and equivalent viscous damping coefficient of the LCSPDs were estimated by quasi-static tests. A finite element analysis was carried out based on the variables of web thickness and aspect ratio, and the validity of the finite element analysis was confirmed by comparing the results of the model with the experimental results. Comparing the horizontal low-yield-point corrugated steel plate dampers (LCSPD_H) with the vertical low-yield-point corrugated steel plate dampers (LCSPD_V), Damper specimen LCSPD_H exhibited better energy dissipation and ductility. Finally, a simplified formula was proposed to estimate the shear-carrying capacity of the LCSPDs, and the calculated results agreed well with the experimental results.

ACS Style

Wei Wang; Jiangliang Song; Wanzhi Wang; Xiaobo Ding; Zheng Lu. Experimental Investigation of the Seismic Behavior of Low-Yield-Point Corrugated Steel Plate Dampers. Journal of Structural Engineering 2021, 147, 04020335 .

AMA Style

Wei Wang, Jiangliang Song, Wanzhi Wang, Xiaobo Ding, Zheng Lu. Experimental Investigation of the Seismic Behavior of Low-Yield-Point Corrugated Steel Plate Dampers. Journal of Structural Engineering. 2021; 147 (2):04020335.

Chicago/Turabian Style

Wei Wang; Jiangliang Song; Wanzhi Wang; Xiaobo Ding; Zheng Lu. 2021. "Experimental Investigation of the Seismic Behavior of Low-Yield-Point Corrugated Steel Plate Dampers." Journal of Structural Engineering 147, no. 2: 04020335.

Conference paper
Published: 20 December 2020 in Vibration Engineering for a Sustainable Future
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In this paper, the vibration control effect of multiunit impact damper (MUID) under stationary random excitation is studied, based on both the elastic and nonlinear benchmark structures. The benchmark structure is a steel frame, which can calculate the nonlinear response by considering the material nonlinearity at the ends of the beam and column. The control effects of the MUID on elastic and nonlinear structures are compared to analyze the influence of structural nonlinearity on the performance of MUID. The results show that a lightweight MUID with reasonable parameters can significantly reduce the root-mean-square (RMS) displacement response of the benchmark structure. Furthermore, the structural nonlinearity will lead to a decrease in the vibration control performance of the MUID. The reasons for this phenomenon are that the effective momentum exchange and energy dissipation of the MUID will decrease when the benchmark structure responds in a nonlinear state.

ACS Style

Zheng Lu; Naiyin Ma; Hengrui Zhang. Study on the Influence of Structural Nonlinearity on the Performance of Multiunit Impact Damper. Vibration Engineering for a Sustainable Future 2020, 297 -303.

AMA Style

Zheng Lu, Naiyin Ma, Hengrui Zhang. Study on the Influence of Structural Nonlinearity on the Performance of Multiunit Impact Damper. Vibration Engineering for a Sustainable Future. 2020; ():297-303.

Chicago/Turabian Style

Zheng Lu; Naiyin Ma; Hengrui Zhang. 2020. "Study on the Influence of Structural Nonlinearity on the Performance of Multiunit Impact Damper." Vibration Engineering for a Sustainable Future , no. : 297-303.

Full paper
Published: 27 October 2020 in Macromolecular Materials and Engineering
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In this work, a ternary blend of polyolefin elastomer (POE), lauric acid (LA), and poly(ε‐caprolactone) (PCL) with triple‐shape memory effect (triple‐SME) is reported. LA and PCL exhibit distinct thermal transitions and construct two reversible switching networks capable of fixing and releasing different temporary shapes under a mild condition. The ternary blend shows excellent triple‐shape memory properties and good toughness. Besides, the permanent shape can be reconfigured by a simple thermal treatment. These particular features make the novel blend a competitive candidate for diverse applications. And the creative combination of crystalline small molecule and semicrystalline polymer expands the freedom for producing triple‐shape memory polymers (triple‐SMPs).

ACS Style

Zhenlei Zhang; Jiang Du; Wanwen Shan; Tianbin Ren; Zheng Lu. A Facile Approach toward Thermoplastic Triple‐Shape Memory Polymers. Macromolecular Materials and Engineering 2020, 306, 1 .

AMA Style

Zhenlei Zhang, Jiang Du, Wanwen Shan, Tianbin Ren, Zheng Lu. A Facile Approach toward Thermoplastic Triple‐Shape Memory Polymers. Macromolecular Materials and Engineering. 2020; 306 (1):1.

Chicago/Turabian Style

Zhenlei Zhang; Jiang Du; Wanwen Shan; Tianbin Ren; Zheng Lu. 2020. "A Facile Approach toward Thermoplastic Triple‐Shape Memory Polymers." Macromolecular Materials and Engineering 306, no. 1: 1.

Research article
Published: 25 October 2020 in Journal of Vibration and Control
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Tremor is an involuntary movement that makes many patients suffer, and passive absorbers used in wearable robot are proved to be effective for tremor suppression. A particle damper is a kind of a passive vibration control device taking advantage of energy dissipation and momentum exchange caused by particle collisions. To apply particle damping technology in reducing tremor amplitude in the human hand, this study establishes a mechanical model of the particle damper for tremor suppression and obtains its steady-state solutions under simplified tremor excitation. The accuracy of steady-state solutions and the particle damper effectiveness in reducing tremor is validated by numerical simulations and experimental studies. To further explore its damping mechanism, some important damper parameters are then analyzed. It is shown that increasing the particle mass leads to an increase of the particle damper performance for tremor suppression, but it has an upper limit. The provided damping of the particle damper becomes approximately independent of the tremor frequency and the tremor amplitude within a certain range, which indicates that a particle damper with reasonable design is suitable for tremor suppression.

ACS Style

Zheng Lu; Zhikuang Huang. Analytical and experimental studies on particle damper used for tremor suppression. Journal of Vibration and Control 2020, 1 .

AMA Style

Zheng Lu, Zhikuang Huang. Analytical and experimental studies on particle damper used for tremor suppression. Journal of Vibration and Control. 2020; ():1.

Chicago/Turabian Style

Zheng Lu; Zhikuang Huang. 2020. "Analytical and experimental studies on particle damper used for tremor suppression." Journal of Vibration and Control , no. : 1.

Journal article
Published: 24 September 2020 in Applied Acoustics
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This study proposes an improved equivalent simplified method coupled with the finite element method (ESM-FEM) to investigate the control performance of the particle tuned mass damper (PTMD) attached to the multi-degree-of-freedom (MDOF) structure (e.g. transmission tower). To validate the proposed method, the coupled system responses from the ESM-FEM method are compared to the results of the previous study under the free vibration and seismic excitation. The transmission tower is modeled by the FEM in Abaqus, while the PTMD is simulated by the ESM in Python. The damping mechanism of the PTMD-MDOF system is investigated based on the ESM-FEM method, and the PTMD’s control effect is evaluated. Besides, the reliability of the system’s control performance is also discussed. The results show that the ESM-FEM method is reasonable for evaluating the damping performance of the coupled system, and its accuracy is validated by the experimental data and Matlab program. Meanwhile, the proposed method makes it easier to obtain the damping force to further better understand the damping mechanism of the coupled system. Furthermore, the PTMD system has good robustness, and its control performance is less sensitive to unpredictable seismic excitations.

ACS Style

Kunjie Rong; Zheng Lu. An improved ESM-FEM method for seismic control of particle tuned mass damper in MDOF system. Applied Acoustics 2020, 172, 107663 .

AMA Style

Kunjie Rong, Zheng Lu. An improved ESM-FEM method for seismic control of particle tuned mass damper in MDOF system. Applied Acoustics. 2020; 172 ():107663.

Chicago/Turabian Style

Kunjie Rong; Zheng Lu. 2020. "An improved ESM-FEM method for seismic control of particle tuned mass damper in MDOF system." Applied Acoustics 172, no. : 107663.

Research article
Published: 15 August 2020 in Structural Control and Health Monitoring
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Particle tuned mass dampers (PTMDs) have attracted recent attention for reducing seismic demands on large structures. Yet, research on the control performance of PTMDs for soil–structure interaction (SSI) systems under earthquake excitations is non‐existent. This paper presents a comprehensive investigation on the effectiveness of PTMD devices for pile‐supported multistory frames through shaking table tests and simulations with validated numerical models. Particle damping effectiveness is analyzed through comparisons with systems lacking external damping. The test results show that the mitigation effects of PTMDs on the maximum structural accelerations and displacements decrease when SSI effects are present and that particle damping improves control performance of conventional TMDs. Detailed finite element models of the tested specimens are also constructed—including SSI effects—and validated initially against the test data. In these models, the soil nonlinearities are considered using a bounding surface plasticity model, and the PTMD devices are simplified to an equivalent single‐particle damper using an analytical model. The validated numerical models can be used in further parametric studies involving optimal PTMD design and deployment within a performance‐based seismic engineering framework.

ACS Style

Shutong Liu; Zheng Lu; Peizhen Li; Wenyang Zhang; Ertugrul Taciroglu. Effectiveness of particle tuned mass damper devices for pile‐supported multi‐story frames under seismic excitations. Structural Control and Health Monitoring 2020, 1 .

AMA Style

Shutong Liu, Zheng Lu, Peizhen Li, Wenyang Zhang, Ertugrul Taciroglu. Effectiveness of particle tuned mass damper devices for pile‐supported multi‐story frames under seismic excitations. Structural Control and Health Monitoring. 2020; ():1.

Chicago/Turabian Style

Shutong Liu; Zheng Lu; Peizhen Li; Wenyang Zhang; Ertugrul Taciroglu. 2020. "Effectiveness of particle tuned mass damper devices for pile‐supported multi‐story frames under seismic excitations." Structural Control and Health Monitoring , no. : 1.

Research article
Published: 03 August 2020 in Structure and Infrastructure Engineering
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In this study, shaking table tests were performed on a 1/8-scaled test model equipped with and without a tuned mass damper (TMD) to validate the effectiveness of TMD on a transmission tower under seismic excitations and to investigate its damping mechanism. Based on the experimental results, the vibration control performance of TMD and the effects of earthquake characteristics were analysed. The results showed that TMD had efficient control effects on the transmission tower responses, but the control performance varied. Moreover, the vibration control performance was related to the earthquake types and decreased with the increase in excitation intensity. The vibration control performance along the height was also analysed comprehensively. Finally, the dynamic responses of the transmission tower model with TMD were simulated using the finite element software, ANSYS, which agreed well with the shaking table test results. Based on the finite element model, the effect of the damping ratio of TMD on the vibration control performance was determined through a parametric study, indicating that adding the damping ratio can improve the vibration control performance within a specific range. The experimental results and the numerical simulation method reported in this paper are applicable in transformation towers located in active seismic areas.

ACS Style

Bin Zhao; Di Wu; Zheng Lu. Shaking table test and numerical simulation of the vibration control performance of a tuned mass damper on a transmission tower. Structure and Infrastructure Engineering 2020, 1 -15.

AMA Style

Bin Zhao, Di Wu, Zheng Lu. Shaking table test and numerical simulation of the vibration control performance of a tuned mass damper on a transmission tower. Structure and Infrastructure Engineering. 2020; ():1-15.

Chicago/Turabian Style

Bin Zhao; Di Wu; Zheng Lu. 2020. "Shaking table test and numerical simulation of the vibration control performance of a tuned mass damper on a transmission tower." Structure and Infrastructure Engineering , no. : 1-15.

Journal article
Published: 03 August 2020 in Soil Dynamics and Earthquake Engineering
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Soil-structure interaction (SSI) phenomena subjected to seismic loadings are investigated in this study. Firstly, shaking table tests on dynamic soil‐structure interaction subjected to seismic loadings are carried out, and SSI effects are analyzed through a comparative study between the soil-structure system and the rigid foundation condition. Then, a corresponding numerical model on the SSI tests is presented. In the finite element model, a bounding surface plasticity model and an equivalent linear method are separately used for simulating the nonlinear behavior of soil. It turns out that the calculated results by the bounding surface plasticity model agree much better with the experimental results. Finally, the effects of different soil types and structural properties on soil-structure interaction are discussed by numerical parametric study. The results show that SSI effects noticeably mitigate the dynamic response of structure, and the closer the frequency of superstructure to the soil frequency, the more obvious the effect of soil-structure interaction. With increased shear wave velocity of soil, the impact of soil-structure interaction weakens. It is important for studying the impact of SSI on structural responses and practical engineering design purposes.

ACS Style

Shutong Liu; Peizhen Li; Wenyang Zhang; Zheng Lu. Experimental study and numerical simulation on dynamic soil‐structure interaction under earthquake excitations. Soil Dynamics and Earthquake Engineering 2020, 138, 106333 .

AMA Style

Shutong Liu, Peizhen Li, Wenyang Zhang, Zheng Lu. Experimental study and numerical simulation on dynamic soil‐structure interaction under earthquake excitations. Soil Dynamics and Earthquake Engineering. 2020; 138 ():106333.

Chicago/Turabian Style

Shutong Liu; Peizhen Li; Wenyang Zhang; Zheng Lu. 2020. "Experimental study and numerical simulation on dynamic soil‐structure interaction under earthquake excitations." Soil Dynamics and Earthquake Engineering 138, no. : 106333.

Journal article
Published: 13 July 2020 in Applied Acoustics
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In this study, a shaking table test was performed to systematically explore the damping mechanism of buffered impact dampers. Parameters such as mass ratio, gap clearance, excitation characteristics and material properties were analyzed. Seven buffered materials were chosen in this study, and experiments on both buffered container and buffered particle were carried out. New concept “collision hardness” was proposed and further validated to evaluate how material properties affect the damping effect, which proved to be a vital index affecting momentum exchange, thus providing guidance for material selection. Results show that the damper’s reduction effect generally increases with the increase of mass ratio; the gap clearance should be moderate if a better reduction effect is expected; the optimal gap clearance is related to excitation characteristics. Damper with small collision hardness performs better, and the coefficient of restitution does not greatly affect the damping performance, because it reflects the coupled influences of momentum exchange and energy dissipation which counteracts with each other. In practical engineering, mass ratio is suggested to be considered before gap clearance in the design, and the damper with a hard particle and soft inner wall of the container is recommended.

ACS Style

Yan Wang; Zheng Lu; Jiang Du. Experimental study on damping mechanism of buffered impact dampers. Applied Acoustics 2020, 170, 107492 .

AMA Style

Yan Wang, Zheng Lu, Jiang Du. Experimental study on damping mechanism of buffered impact dampers. Applied Acoustics. 2020; 170 ():107492.

Chicago/Turabian Style

Yan Wang; Zheng Lu; Jiang Du. 2020. "Experimental study on damping mechanism of buffered impact dampers." Applied Acoustics 170, no. : 107492.

Journal article
Published: 02 July 2020 in Engineering Structures
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A rocking steel frame is proposed in this paper, which can reduce the plastic deformation of the main structural components under strong earthquake actions and can be easily repaired after earthquakes. Three 1:2 testing steel frames (buckling-restrained braced steel frame, rocking steel frame with rigid beam-column joint and rocking steel frame with semi-rigid beam-column joint) are designed and manufactured. The pseudo-static tests on the three specimens are carried out respectively. The hysteretic curves, skeleton curves, stiffness degradation rules and other parameters of the three specimens are compared and analyzed to study the seismic performance and damage characteristics of the rocking steel frame. The effect of beam-column joint form on the seismic performance of the rocking steel frame is investigated. In addition, the corresponding numerical analysis and modelling methods are introduced. The results indicate that the rocking structure can effectively reduce the damage of beams and columns. The RBS (rigid beam-column joint with reduced beam section) on the beam end can effectively transfer plastic hinge to the beam end, thus protecting the beam-column joints. It can be also concluded from the results that compared with rigid beam-column joint, semi-rigid beam-column joint has greater superiority and better seismic performance, which can protect the main components more effectively.

ACS Style

Guowei Zhang; Qiaoqiao Fan; Zheng Lu; Ziwei Zhao; Zuoshuai Sun. Experimental and numerical study on the seismic performance of rocking steel frames with different joints under earthquake excitation. Engineering Structures 2020, 220, 110974 .

AMA Style

Guowei Zhang, Qiaoqiao Fan, Zheng Lu, Ziwei Zhao, Zuoshuai Sun. Experimental and numerical study on the seismic performance of rocking steel frames with different joints under earthquake excitation. Engineering Structures. 2020; 220 ():110974.

Chicago/Turabian Style

Guowei Zhang; Qiaoqiao Fan; Zheng Lu; Ziwei Zhao; Zuoshuai Sun. 2020. "Experimental and numerical study on the seismic performance of rocking steel frames with different joints under earthquake excitation." Engineering Structures 220, no. : 110974.

Journal article
Published: 26 June 2020 in Engineering Structures
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A series of large-scale shaking table tests of tall buildings with nonlinear viscous dampers on soft soils in pile group foundations are performed to better understand the effect of the seismic pile-soil-structure interaction (PSSI) on the dynamic responses of the pile, soil, structure and the performance of the viscous dampers. Two different models are investigated, including a fixed-base structure with viscous dampers, representing the situation ignoring the soil-structure interaction (SSI) and a structure with viscous dampers supported by 3-by-3 pile group foundation in soft soil within a shear laminar soil container. The superstructure is a 12-story reinforced concrete (RC) frame. The seismic excitations of Shanghai Bedrock waves, 1995 Kobe earthquake and 1999 Chi-Chi earthquake events are selected and used in the shaking table tests. Finally, a three-dimensional numerical model is developed and verified to be appropriate for capturing the dynamic responses of soil-pile-structure with viscous dampers. Based on the experimental results, the PSSI system has longer natural periods and the frequencies decrease more lightly than the fixed-base structure after the tests. In addition, the influences of PSSI on the frequencies are much greater than the damping ratio. Moreover, by comparing with the fixed-base conditions, PSSI tends to decrease elastic-plastic inter-story drift of the structure more greatly than the acceleration and shear force. However, the overall deformation of the structure may increase due to the obvious and large rocking and translational components. More interestingly, the hysteretic performance and the efficiency of viscous dampers on mitigating the structural dynamic responses are reduced by the PSSI effect compared with the fixed-base models. Consequently, ignoring the SSI effects may result in unrealistic results of the seismic responses of the superstructure and overstate the performance of the nonlinear viscous dampers. It is of great importance to consider the seismic SSI effect in the design of viscous dampers and structures.

ACS Style

Jinping Yang; Zheng Lu; Peizhen Li. Large-scale shaking table test on tall buildings with viscous dampers considering pile-soil-structure interaction. Engineering Structures 2020, 220, 110960 .

AMA Style

Jinping Yang, Zheng Lu, Peizhen Li. Large-scale shaking table test on tall buildings with viscous dampers considering pile-soil-structure interaction. Engineering Structures. 2020; 220 ():110960.

Chicago/Turabian Style

Jinping Yang; Zheng Lu; Peizhen Li. 2020. "Large-scale shaking table test on tall buildings with viscous dampers considering pile-soil-structure interaction." Engineering Structures 220, no. : 110960.

Journal article
Published: 10 May 2020 in Journal of Sound and Vibration
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In this paper, stochastic response control of particle damper system that is subjected to random seismic excitation is studied and the corresponding damping mechanism is further discussed. Based on the principle of multi-particle damper equivalent to a single particle damper, the nonlinear particle damper is equivalent to a linear system by the equivalent linearization method, and the mathematical expression of stochastic response of the particle damper system is obtained. The non-stationary response and stationary response of the particle damper system are subsequently compared, and the parametric study is conducted based on the stationary response of the particle damper system. It is shown that for a given particle damper system under random seismic excitation, there is an optimal gap clearance to minimize the structural response and this is the key parameter; the mass ratio is closely related to the gap clearance and in practice, the appropriate mass ratio should be properly selected; particle damper can also suppress the vibration response of the primary structure well over a wide frequency range, showing its strong robustness. Certain design suggestions are herein proposed. Finally, a numerical analysis and an experimental study are carried out to verify the viability and reliability of the stochastic vibration analysis of the particle damper system.

ACS Style

Zheng Lu; Yuan Liao; Zhikuang Huang. Stochastic response control of particle dampers under random seismic excitation. Journal of Sound and Vibration 2020, 481, 115439 .

AMA Style

Zheng Lu, Yuan Liao, Zhikuang Huang. Stochastic response control of particle dampers under random seismic excitation. Journal of Sound and Vibration. 2020; 481 ():115439.

Chicago/Turabian Style

Zheng Lu; Yuan Liao; Zhikuang Huang. 2020. "Stochastic response control of particle dampers under random seismic excitation." Journal of Sound and Vibration 481, no. : 115439.

Research article
Published: 04 May 2020 in Journal of Vibration and Control
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In this article, the vibration control effect of the multiunit impact damper under stationary random excitation and seismic excitation is studied, based on both the elastic and nonlinear benchmark structures. The benchmark structure is a nonlinear steel frame structure, which can calculate the nonlinear response by considering the material nonlinearity at the ends of the beam and column. To analyze the influence of various system parameters on the performance of the multiunit impact damper, such as the number of units, mass ratio, damping ratio, and gap clearance, a great number of parameter studies are carried out. In addition, the control effects of the multiunit impact damper on elastic and nonlinear structures are compared to analyze the influence of structural nonlinearity on the performance of the multiunit impact damper. The results show that a lightweight multiunit impact damper with reasonable parameters can significantly reduce the root mean square displacement response of the benchmark structure. Furthermore, the structural nonlinearity will lead to a decrease in the vibration control performance of the multiunit impact damper. The reasons for this phenomenon are that the effective momentum exchange and energy dissipation of the multiunit impact damper will decrease when the benchmark structure responds in a nonlinear state.

ACS Style

Zheng Lu; Naiyin Ma; Hengrui Zhang. Study on the influence of structural nonlinearity on the performance of multiunit impact damper. Journal of Vibration and Control 2020, 27, 197 -207.

AMA Style

Zheng Lu, Naiyin Ma, Hengrui Zhang. Study on the influence of structural nonlinearity on the performance of multiunit impact damper. Journal of Vibration and Control. 2020; 27 (1-2):197-207.

Chicago/Turabian Style

Zheng Lu; Naiyin Ma; Hengrui Zhang. 2020. "Study on the influence of structural nonlinearity on the performance of multiunit impact damper." Journal of Vibration and Control 27, no. 1-2: 197-207.

Chapter
Published: 28 March 2020 in Environmental and Human Impact of Buildings
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The previous chapter carries out the performance analysis of particle dampers attached to single-degree-of-freedom (SDOF) structures, with an emphasis on the structural dynamic characteristics under correlated stationary random excitations in the x and y directions. Based on such investigation, in this chapter, the main structures are generalized to multi-degree-of-freedom (MDOF) ones, and the damping performance of particle dampers attached to MDOF structures is systematically analyzed. Especially, the external excitations have been expanded from stationary random excitations to nonstationary random excitations, which are more consistent with the actual situation (Lu et al in J Vib Control 17(10):1454–1471, 2011, [1], Lu et al in Sturct Control Health Monit 18(1):79–98, 2011, [2] and Lu et al in J Sound Vib 329(26):5415–5433, 2010, [3]).

ACS Style

Zheng Lu; Sami F. Masri; Xilin Lu. Performance Analysis of Particle Dampers Attached to Multi-degree-of-Freedom (MDOF) Structures. Environmental and Human Impact of Buildings 2020, 171 -186.

AMA Style

Zheng Lu, Sami F. Masri, Xilin Lu. Performance Analysis of Particle Dampers Attached to Multi-degree-of-Freedom (MDOF) Structures. Environmental and Human Impact of Buildings. 2020; ():171-186.

Chicago/Turabian Style

Zheng Lu; Sami F. Masri; Xilin Lu. 2020. "Performance Analysis of Particle Dampers Attached to Multi-degree-of-Freedom (MDOF) Structures." Environmental and Human Impact of Buildings , no. : 171-186.

Chapter
Published: 28 March 2020 in Environmental and Human Impact of Buildings
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The concept of particle damping could be traced back to 1937, when Paget [1] was studying the vibration attenuation problem of the turbine blades, during which he invented the impact damper.

ACS Style

Zheng Lu; Sami F. Masri; Xilin Lu. Origination, Development and Applications of Particle Damping Technology. Environmental and Human Impact of Buildings 2020, 21 -51.

AMA Style

Zheng Lu, Sami F. Masri, Xilin Lu. Origination, Development and Applications of Particle Damping Technology. Environmental and Human Impact of Buildings. 2020; ():21-51.

Chicago/Turabian Style

Zheng Lu; Sami F. Masri; Xilin Lu. 2020. "Origination, Development and Applications of Particle Damping Technology." Environmental and Human Impact of Buildings , no. : 21-51.

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Published: 28 March 2020 in Environmental and Human Impact of Buildings
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Since semi-active control can provide adaptability comparable to active control without installing large energy sources, semi-active control devices have attracted considerable attention in recent years. In fact, many devices can operate on battery power, which is important in extreme situations such as typhoons, tornadoes, earthquakes, where structural main power supply failures occur. According to the currently accepted definition, the semi-active control device does not increase the mechanical energy (including structure and device) of the control system, but has the property of being dynamically changeable to minimize the response of the structural system. Therefore, semi-active control systems do not have the potential to reduce the stability of structural systems (in limited input/limited output frames) compared to active control systems.

ACS Style

Zheng Lu; Sami F. Masri; Xilin Lu. Semi-active Control Particle Damping Technology. Environmental and Human Impact of Buildings 2020, 331 -369.

AMA Style

Zheng Lu, Sami F. Masri, Xilin Lu. Semi-active Control Particle Damping Technology. Environmental and Human Impact of Buildings. 2020; ():331-369.

Chicago/Turabian Style

Zheng Lu; Sami F. Masri; Xilin Lu. 2020. "Semi-active Control Particle Damping Technology." Environmental and Human Impact of Buildings , no. : 331-369.