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D. Jiang
Department of Civil Engineering, School of Science, Nanjing University of Science and Technology, Nanjing, 210094, China

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Review article
Published: 21 May 2021 in Ocean Engineering
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In recent years, Very Large Floating Structures (VLFS) technology has attracted much attention for its sustainable and eco-friendly approach in creating land from the sea. Owing to the massive size, VLFS are usually fabricated as a number of floating modules in shipyards, towed to site and connected on sea. To ensure the functionality of such connected VLFS, effective connector systems are essential. The connector system must address issues related to the relative motion between adjacent modules and be able to sustain forces as a result of wave motion. This paper presents a critical review on the research and development in connector systems for modularized VLFS. Various design concepts for connector systems are first categorized and their working principles outlined. Research studies on hydroelastic analysis of VLFS and the effectiveness of connector systems in reducing the hydroelastic responses and internal stress resultants in connectors are also reviewed. In addition, potential technical challenges on the determination of connector stiffness in practical designs are discussed. Finally, some recommendations and suggestions for future practice are provided.

ACS Style

D. Jiang; K.H. Tan; C.M. Wang; J. Dai. Research and development in connector systems for Very Large Floating Structures. Ocean Engineering 2021, 232, 109150 .

AMA Style

D. Jiang, K.H. Tan, C.M. Wang, J. Dai. Research and development in connector systems for Very Large Floating Structures. Ocean Engineering. 2021; 232 ():109150.

Chicago/Turabian Style

D. Jiang; K.H. Tan; C.M. Wang; J. Dai. 2021. "Research and development in connector systems for Very Large Floating Structures." Ocean Engineering 232, no. : 109150.

Journal article
Published: 21 April 2021 in Ocean Engineering
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Large floating structures such as platforms, breakwaters and piers, have been constructed in many countries in coastal areas in a bid to increase land space. Due to construction ease and operational flexibility, these facilities are commonly consisted of relatively small floating units that are subsequently connected on sea. This paper first describes box-like structural systems for concrete floating structures. Finite element (FE) analyses are then performed to assess the structural performance of concrete floating structures when subjected to self-weight, imposed live load, hydrostatic pressure and buoyancy force. The effects of geometrical shapes, cell numbers and slab thickness on the structural performance of box-like floating modules are investigated. Results indicate the need to provide prestressing steels so as to prevent cracking in the concrete modules. Besides, material requirements for different configurations were compared to provide the most economical solution for box-like concrete floating units. Furthermore, global responses of modular multi-purpose floating structures with different geometrical shapes were investigated via hydroelastic analyses using self-developed hybrid boundary element (BE) – FE code. Global flexural stresses are found to be quite high for rigidly-interconnected large floating structures due to regular wave loadings, especially when the geometrical aspect ratio becomes large. The use of hinge joints is effective in reducing bending moments but it relatively increases the vertical deflections. A trade-off should be considered between internal loads and structural motions in the conceptual design of large floating structure system.

ACS Style

D. Jiang; K.H. Tan; J. Dai; K.K. Ang; H.P. Nguyen. Behavior of concrete modular multi-purpose floating structures. Ocean Engineering 2021, 229, 108971 .

AMA Style

D. Jiang, K.H. Tan, J. Dai, K.K. Ang, H.P. Nguyen. Behavior of concrete modular multi-purpose floating structures. Ocean Engineering. 2021; 229 ():108971.

Chicago/Turabian Style

D. Jiang; K.H. Tan; J. Dai; K.K. Ang; H.P. Nguyen. 2021. "Behavior of concrete modular multi-purpose floating structures." Ocean Engineering 229, no. : 108971.

Journal article
Published: 24 June 2020 in Journal of Marine Science and Engineering
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As a potential option for transportation applications in coastal areas, curved floating bridges with a same small specified rise to span ratio of 0.134, supported by multiple pontoons, are investigated in this paper. Two conceptual curved bridges are proposed following a circular arc shape with different span lengths (500 and 1000 m). Both bridges are end-connected to the shoreline without any underwater mooring system, while the end-connections can be either all six degrees of freedom (D.O.F) fixed or two rotational D.O.F released. Eigen value analysis is carried out to identify the modal parameters of the floating bridge system. Static and dynamic analysis under extreme environmental conditions are performed to study the pontoon motions as well as structural responses of the bridge deck. Deflections and internal forces (axial forces, shear forces, and bending moment) are thoroughly studied with the variation of the span length and end support conditions in terms of the same specified small rise-span ratio. The ratio of axial force to horizontal bending moment are presented. From the study, it is found that the current parameters for the bridge are relatively reasonable regarding responses. However, the small rise-span does not provide enough arch effects. A higher rise-span ratio or stiffer bridge cross-sectional property is preferred, especially for the long bridge. In addition, the flexible end connections are preferred considering the structural responses at the end regions.

ACS Style

Ling Wan; Dongqi Jiang; Jian Dai. Numerical Modelling and Dynamic Response Analysis of Curved Floating Bridges with a Small Rise-Span Ratio. Journal of Marine Science and Engineering 2020, 8, 467 .

AMA Style

Ling Wan, Dongqi Jiang, Jian Dai. Numerical Modelling and Dynamic Response Analysis of Curved Floating Bridges with a Small Rise-Span Ratio. Journal of Marine Science and Engineering. 2020; 8 (6):467.

Chicago/Turabian Style

Ling Wan; Dongqi Jiang; Jian Dai. 2020. "Numerical Modelling and Dynamic Response Analysis of Curved Floating Bridges with a Small Rise-Span Ratio." Journal of Marine Science and Engineering 8, no. 6: 467.

Journal article
Published: 15 July 2019 in Applied Sciences
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Shear walls are effective lateral load resisting elements in high-rise buildings. This paper presents an experimental study of the seismic performance of a composite shear wall system that consists of high-strength concrete walls with the embedded steel plate. Two sets of wall specimens with different aspect ratios (height/width, 1.5 and 2.7) were constructed and tested under quasi-static reversed cyclic loading, including five reinforced concrete shear walls (RCSW) and six reinforced concrete-steel plate shear walls (RCSPSW). The progression of damage, failure modes, and load-displacement responses of test specimens were studied and compared based on experimental observations. The test results indicated that high-strength (HS) RCSPSW system showed superior lateral load strength and acceptable deformation capability. The axial compressive load was found to have an indispensable effect on the ductility of both RCSW and RCSPSW, and an upper limit of axial compression ratio (0.5) is recommended for the application of HS RCSPSW in engineering practices. In addition, the design strength models were suggested for predicting the shear and flexure peak strength values of RCSPSW systems, and their applicability and reliability were verified by comparing with test results.

ACS Style

Dongqi Jiang; Congzhen Xiao; Tao Chen; Yuye Zhang. Experimental Study of High-Strength Concrete-Steel Plate Composite Shear Walls. Applied Sciences 2019, 9, 2820 .

AMA Style

Dongqi Jiang, Congzhen Xiao, Tao Chen, Yuye Zhang. Experimental Study of High-Strength Concrete-Steel Plate Composite Shear Walls. Applied Sciences. 2019; 9 (14):2820.

Chicago/Turabian Style

Dongqi Jiang; Congzhen Xiao; Tao Chen; Yuye Zhang. 2019. "Experimental Study of High-Strength Concrete-Steel Plate Composite Shear Walls." Applied Sciences 9, no. 14: 2820.

Journal article
Published: 08 October 2018 in International Journal of Structural Stability and Dynamics
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This paper is concerned with a numerical study on the dynamic response of a high-speed rail (HSR) system subjected to unsupported sleepers using the moving element method (MEM). A three-phase computational scheme in conjunction with the MEM is proposed to account for the motion of the unsupported sleepers in relation to the truncated rail segment in the moving coordinate system. The accuracy of the proposed computational scheme is examined by comparison with available analytical results in the literature and against the finite element method using commercial software. A parametric study is conducted using a computational model consisting of a 10-degree of freedom train model and a three-layer ballasted track model to investigate the effect of unsupported sleepers on the dynamic response of the HSR system. Various factors affecting the response of the HSR system, including the speed of the train, the number of unsupported sleepers and the distance between the unsupported sleepers, are examined and discussed.

ACS Style

Jian Dai; Kok Keng Ang; Dongqi Jiang; Van Hai Luong; Minh Thi Tran. Dynamic Response of High-Speed Train-Track System Due to Unsupported Sleepers. International Journal of Structural Stability and Dynamics 2018, 18, 1 .

AMA Style

Jian Dai, Kok Keng Ang, Dongqi Jiang, Van Hai Luong, Minh Thi Tran. Dynamic Response of High-Speed Train-Track System Due to Unsupported Sleepers. International Journal of Structural Stability and Dynamics. 2018; 18 (10):1.

Chicago/Turabian Style

Jian Dai; Kok Keng Ang; Dongqi Jiang; Van Hai Luong; Minh Thi Tran. 2018. "Dynamic Response of High-Speed Train-Track System Due to Unsupported Sleepers." International Journal of Structural Stability and Dynamics 18, no. 10: 1.

Technical paper
Published: 05 June 2018 in Structural Concrete
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Prestressed concrete (PC) tanks have been widely used in industrial applications and are commonly constructed as base‐supported structures. In land–space constrained cities, it may be viable to construct such facilities as floating structures on sea areas. Several innovative conceptual designs of floating fuel storage tanks, including double‐ and single‐hull structures, are first proposed in this paper. For this new type of fuel storage facility, the self‐weight and in‐fill fuel are balanced by buoyancy forces, and there is no need for massive foundations. Due to the absence of specific guidelines, many design concerns have to be addressed before a fully functional PC floating fuel storage facility can be designed and operated economically. In this study, finite‐element analyses are performed to investigate the structural behavior of floating fuel storage tanks of various design options. To mobilize the buoyancy and hydrostatic load effects during filling operations, water ballasting and the use of in‐fill expanded polystyrene foam were examined to optimize the performance of proposed concepts. Analysis results indicate that single‐hull tanks show better performance than double‐hull tanks because the hydrostatic pressure on the tank wall due to outside seawater and in‐fill fuel are balanced to a great extent. Following the principles of load‐balancing and allowable stress design approach, prestressing steel requirements are determined for the selected tank concept.

ACS Style

Dongqi Jiang; Kiang Hwee Tan; Jian Dai; Khim Chye Gary Ong; Sonal Heng. Structural performance evaluation of innovative prestressed concrete floating fuel storage tanks. Structural Concrete 2018, 20, 15 -31.

AMA Style

Dongqi Jiang, Kiang Hwee Tan, Jian Dai, Khim Chye Gary Ong, Sonal Heng. Structural performance evaluation of innovative prestressed concrete floating fuel storage tanks. Structural Concrete. 2018; 20 (1):15-31.

Chicago/Turabian Style

Dongqi Jiang; Kiang Hwee Tan; Jian Dai; Khim Chye Gary Ong; Sonal Heng. 2018. "Structural performance evaluation of innovative prestressed concrete floating fuel storage tanks." Structural Concrete 20, no. 1: 15-31.

Journal article
Published: 01 May 2018 in Marine Structures
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ACS Style

Dongqi Jiang; Kiang Hwee Tan; Cm Wang; Khim Chye Gary Ong; Helge Bra; Jingzhe Jin; Min Ook Kim. Analysis and design of floating prestressed concrete structures in shallow waters. Marine Structures 2018, 59, 301 -320.

AMA Style

Dongqi Jiang, Kiang Hwee Tan, Cm Wang, Khim Chye Gary Ong, Helge Bra, Jingzhe Jin, Min Ook Kim. Analysis and design of floating prestressed concrete structures in shallow waters. Marine Structures. 2018; 59 ():301-320.

Chicago/Turabian Style

Dongqi Jiang; Kiang Hwee Tan; Cm Wang; Khim Chye Gary Ong; Helge Bra; Jingzhe Jin; Min Ook Kim. 2018. "Analysis and design of floating prestressed concrete structures in shallow waters." Marine Structures 59, no. : 301-320.

Conference paper
Published: 02 February 2018 in MATEC Web of Conferences
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It is very common in the ballasted track system that sleepers are not well supported by the ballast materials due to the uneven settlement of the ballast under repeated train passage. These unsupported track elements are often termed as hanging sleepers and they can lead to undesirable effects due to increased dynamic response of the train-track system, especially when the speed of the train is high. In this paper, we present a computation scheme in conjunction with the moving element method for the analysis of high-speed train-track dynamics accounting for hanging sleepers. The proposed computational scheme will be first verified by comparison with available analytical results. The dynamic response of a high-speed train traveling on a ballasted track considering unsupported sleepers is next investigated. Various factors affecting the response of the high-speed rail system including the speed of the train, the number of hanging sleepers and the pattern of the hanging sleepers will be examined and discussed.

ACS Style

Jian Dai; Kok Keng Ang; Dongqi Jiang. Moving element analysis of high-speed rail system accounting for hanging sleepers. MATEC Web of Conferences 2018, 148, 05007 .

AMA Style

Jian Dai, Kok Keng Ang, Dongqi Jiang. Moving element analysis of high-speed rail system accounting for hanging sleepers. MATEC Web of Conferences. 2018; 148 ():05007.

Chicago/Turabian Style

Jian Dai; Kok Keng Ang; Dongqi Jiang. 2018. "Moving element analysis of high-speed rail system accounting for hanging sleepers." MATEC Web of Conferences 148, no. : 05007.

Research article
Published: 01 March 2017 in Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit
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In this paper, a computational scheme in conjunction with the moving element method has been proposed to investigate the dynamic response of a high-speed rail system in which the discrete sleepers on the subgrade support the railway track. The track foundation is modeled as a beam supported by uniformly spaced discrete spring-damper units. The high-speed train is modeled as a moving sprung-mass system that travels over the track. The effect of the stiffness of the discrete supports, train speed, and railhead roughness on the dynamic behavior of the train–track system has been investigated. As a comparison, the response of a continuously supported high-speed rail system that uses a foundation stiffness equivalent to that of a discretely supported track has been obtained. The difference in results between the “equivalent” continuously supported and the discretely supported high-speed rails has been compared and discussed. In general, the study found that a high-speed train that travels over a discretely supported track produces more severe vibrations than that travels over a continuously supported track of equivalent foundation stiffness.

ACS Style

Jian Dai; Kok Keng Ang; Minh Thi Tran; Van Hai Luong; Dongqi Jiang. Moving element analysis of discretely supported high-speed rail systems. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 2017, 232, 783 -797.

AMA Style

Jian Dai, Kok Keng Ang, Minh Thi Tran, Van Hai Luong, Dongqi Jiang. Moving element analysis of discretely supported high-speed rail systems. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit. 2017; 232 (3):783-797.

Chicago/Turabian Style

Jian Dai; Kok Keng Ang; Minh Thi Tran; Van Hai Luong; Dongqi Jiang. 2017. "Moving element analysis of discretely supported high-speed rail systems." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 232, no. 3: 783-797.

Journal article
Published: 01 December 2016 in Journal of Bridge Engineering
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A new bridge type called a spread slab-beam bridge was developed recently by using the same concept as that used for spread box beam bridges, in which the beams are spaced apart. This paper presents an evaluation of the new bridge system in terms of design and constructability and investigates the challenges encountered during construction. Forty-four bridge geometries were designed by using standard Texas DOT (TxDOT) slab-beam types to determine the feasible design space. One of the most aggressive geometries with widely spaced slab beams was constructed at full scale. On the basis of the research findings, it was concluded that spread slab beams with a topped panelized deck provide a viable construction method for short-span bridges. Results of a shear-design check show that the standard interface shear reinforcement must be doubled for the first quarter of the span length for more aggressive designs. Larger-than-expected camber of the precast slab beams might cause construction challenges and delays. A 30% increase in standard camber estimates can be used for construction purposes. High differential temperatures together with drying shrinkage might lead to early-age longitudinal deck cracking. Care should be taken during concrete curing to avoid factors that contribute to large temperature changes in the deck.

ACS Style

Tevfik Terzioglu; Dongqi Jiang; Mary Beth D. Hueste; John B. Mander; Tevfik Terzioglu S.M.Asce; Mary Beth D. Hueste M.Asce. Design and Constructability of Spread Slab-Beam Bridges. Journal of Bridge Engineering 2016, 21, 04016089 .

AMA Style

Tevfik Terzioglu, Dongqi Jiang, Mary Beth D. Hueste, John B. Mander, Tevfik Terzioglu S.M.Asce, Mary Beth D. Hueste M.Asce. Design and Constructability of Spread Slab-Beam Bridges. Journal of Bridge Engineering. 2016; 21 (12):04016089.

Chicago/Turabian Style

Tevfik Terzioglu; Dongqi Jiang; Mary Beth D. Hueste; John B. Mander; Tevfik Terzioglu S.M.Asce; Mary Beth D. Hueste M.Asce. 2016. "Design and Constructability of Spread Slab-Beam Bridges." Journal of Bridge Engineering 21, no. 12: 04016089.

Journal article
Published: 01 November 2016 in Engineering Structures
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ACS Style

Dongqi Jiang; Tevfik Terzioglu; Mary Beth D. Hueste; John B. Mander; Gary T. Fry. Experimental study of an in-service spread slab beam bridge. Engineering Structures 2016, 127, 525 -535.

AMA Style

Dongqi Jiang, Tevfik Terzioglu, Mary Beth D. Hueste, John B. Mander, Gary T. Fry. Experimental study of an in-service spread slab beam bridge. Engineering Structures. 2016; 127 ():525-535.

Chicago/Turabian Style

Dongqi Jiang; Tevfik Terzioglu; Mary Beth D. Hueste; John B. Mander; Gary T. Fry. 2016. "Experimental study of an in-service spread slab beam bridge." Engineering Structures 127, no. : 525-535.

Journal article
Published: 01 November 2016 in Journal of Bridge Engineering
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The Texas Department of Transportation (TxDOT) uses precast prestressed concrete slab beams in a side-by-side configuration for short-span bridges in low-clearance areas. To reduce costs, a new bridge type called a spread slab beam bridge was recently developed using the same concept as spread box beam bridges in which the beams are spaced apart. A full-scale spread slab beam bridge was constructed and tested under static and dynamic vehicular loads to evaluate constructability and structural performance. The load-distribution behavior was investigated through field testing, and experimental live-load distribution factors (LLDFs) were evaluated using alignments that provided the most adverse loading cases. The measured response provides detailed experimental data to validate computational modeling techniques for this new class of bridge systems. Research findings show that spread slab beam systems provide a viable construction method for short-span bridges, and that the desired performance was achieved for in-service loading. During field testing, the beam live-load deflections were within the design limits, and no significant cracking or reduction in the overall stiffness of the bridge was observed.

ACS Style

Tevfik Terzioglu; Dongqi Jiang; Mary Beth D. Hueste; John B. Mander; Gary T. Fry. Experimental Investigation of a Full-Scale Spread Slab Beam Bridge. Journal of Bridge Engineering 2016, 21, 04016082 .

AMA Style

Tevfik Terzioglu, Dongqi Jiang, Mary Beth D. Hueste, John B. Mander, Gary T. Fry. Experimental Investigation of a Full-Scale Spread Slab Beam Bridge. Journal of Bridge Engineering. 2016; 21 (11):04016082.

Chicago/Turabian Style

Tevfik Terzioglu; Dongqi Jiang; Mary Beth D. Hueste; John B. Mander; Gary T. Fry. 2016. "Experimental Investigation of a Full-Scale Spread Slab Beam Bridge." Journal of Bridge Engineering 21, no. 11: 04016082.