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学者姓名:韩强

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< Page ,Total 42 >
Quantitative Assessment Framework for the Postearthquake Traffic Flow Capacity of Bridges Based on the Loss Model of Vertical Load-Carrying Capacity SCIE
期刊论文 | 2024 , 29 (3) | JOURNAL OF BRIDGE ENGINEERING
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Abstract :

This paper aimed to propose an analytical framework for assessing the postearthquake traffic flow capacity of girder bridges based on the loss model of vertical load-carrying capacity. For this purpose, a loss model of the vertical load-carrying capacity of a reinforced concrete (RC) column associated with the residual drift ratio and the damage level (i.e., the modified Park-Ang index) was developed to determine the postearthquake vertical load-carrying capacity accurately and quantitatively. Subsequently, the probability seismic demand analysis (PSDA) was performed to obtain the probability distribution functions (PDFs) of engineering demand parameters (EDPs) (i.e., the residual drift and the damage indicator) and the PDF of postearthquake vertical load-carrying capacity was determined based on the developed loss model. Furthermore, the reliability analysis was utilized to calculate the postearthquake reliability index of a bridge by adjusting the mean values of the live load (which reflects the traffic flow capacity), and the postearthquake traffic flow capacity could then be quantitatively determined based on the live load ratio at a target reliability index. Finally, the proposed framework was implemented on a single-column bridge to demonstrate its efficiency. Compared to traditional qualitative and subjective postearthquake functionality assessment of the damaged bridge, the proposed analytical approach offered a mathematical model for the decision-making process.

Keyword :

Residual drift ratio Residual drift ratio Postearthquake traffic flow capacity of bridges Postearthquake traffic flow capacity of bridges Reliability indicator Reliability indicator Damage level Damage level Assessment framework Assessment framework Loss model of the vertical load-carrying capacity Loss model of the vertical load-carrying capacity

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GB/T 7714 Dong, Huihui , Ma, Rui , Han, Qiang et al. Quantitative Assessment Framework for the Postearthquake Traffic Flow Capacity of Bridges Based on the Loss Model of Vertical Load-Carrying Capacity [J]. | JOURNAL OF BRIDGE ENGINEERING , 2024 , 29 (3) .
MLA Dong, Huihui et al. "Quantitative Assessment Framework for the Postearthquake Traffic Flow Capacity of Bridges Based on the Loss Model of Vertical Load-Carrying Capacity" . | JOURNAL OF BRIDGE ENGINEERING 29 . 3 (2024) .
APA Dong, Huihui , Ma, Rui , Han, Qiang , Du, Xiuli . Quantitative Assessment Framework for the Postearthquake Traffic Flow Capacity of Bridges Based on the Loss Model of Vertical Load-Carrying Capacity . | JOURNAL OF BRIDGE ENGINEERING , 2024 , 29 (3) .
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Intelligent identification of moving forces based on visual perception SCIE
期刊论文 | 2024 , 214 | MECHANICAL SYSTEMS AND SIGNAL PROCESSING
WoS CC Cited Count: 11
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Abstract :

The task of identifying moving forces presents a challenging inverse problem for bridge health monitoring and condition assessment. Existing methods for identifying moving loads rely on complex structural response measurement equipment, resulting in inefficiency and elevated costs. To address these challenges, this study introduces an innovative intelligent identification method for moving forces on bridges using visual perception techniques. The proposed method utilizes cameras to capture displacement changes at specific points on the bridge surface to reconstruct moving forces in the time domain. Initially, numerical simulations were conducted to ascertain the feasibility and robustness of identifying moving forces based solely on the structural displacement response. This phase also investigates the influence of different measurement point combinations on identification accuracy. Subsequently, the accuracy of the proposed method in measuring the dynamic displacement response of the structure was carefully evaluated by an outdoor shaking table test. Furthermore, a meticulously designed simply supported beam model was fabricated, followed by the execution of precise vehicle-bridge coupling dynamic experiments. This phase rigorously validates the effectiveness and accuracy of the proposed moving force identification method at varying vehicle speeds. The obtained results substantiate the proposed approach's capability not only to comprehensively capture bridge response data for fullarea monitoring but also to consistently and reliably identify information on moving vehicle forces. This study underscores a pioneering application of intelligent visual perception technology in the field of identifying moving forces. The introduced noncontact intelligent identification method is an effective solution for monitoring moving forces on bridges, which has a wide range of applications in the future.

Keyword :

Bridge health monitoring Bridge health monitoring Intelligent identification Intelligent identification Moving force identification Moving force identification Visual perception Visual perception Vehicle-bridge coupling Vehicle-bridge coupling

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GB/T 7714 Zhang, Shengfei , Ni, Pinghe , Wen, Jianian et al. Intelligent identification of moving forces based on visual perception [J]. | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2024 , 214 .
MLA Zhang, Shengfei et al. "Intelligent identification of moving forces based on visual perception" . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING 214 (2024) .
APA Zhang, Shengfei , Ni, Pinghe , Wen, Jianian , Han, Qiang , Du, Xiuli , Fu, Jinlong . Intelligent identification of moving forces based on visual perception . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2024 , 214 .
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Non-contact impact load identification based on intelligent visual sensing technology SCIE
期刊论文 | 2024 , 23 (6) , 3525-3544 | STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
WoS CC Cited Count: 6
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Abstract :

Accurate identification of impact loads is vital for structural assessment and design. Traditional methods rely on complex equipment, such as accelerometers or strain gauge, which can be expensive and prone to failure. This study introduces a non-contact intelligent identification approach incorporating visual sensing technology, providing a convenient means to identify impact loads. Numerical simulations explore the differences in identifying impact forces through acceleration and displacement responses, particularly by considering such variables as measurement noise and number of measurement points. A meticulously designed experiment verified the feasibility of the proposed method for measuring the displacement and velocity of rapidly moving targets, and evaluated its performance in terms of accuracy. A series of impact loading experiments were conducted on a simply supported girder bridge model to validate the effectiveness of the proposed impact force identification method. Results indicate strong agreement between displacement response measurements and percentile meters. The proposed non-contact method accurately identifies single or continuous impact loads, with a minimum peak relative error of 0.2%. This study represents a pioneering application of intelligent visual sensing technology in the field of impact load identification. Moreover, the current research introduces a novel approach to address the challenges faced by conventional methods in identifying impact loads. Future research can leverage the groundwork laid by this study to further optimize and expand the proposed method, enhancing its capabilities and fully harnessing its potential to offer advanced solutions in structural health monitoring.

Keyword :

intelligent visual perception intelligent visual perception bridge impact loads bridge impact loads Structural health monitoring Structural health monitoring Tikhonov regularization Tikhonov regularization dynamic load identification dynamic load identification

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GB/T 7714 Zhang, Shengfei , Ni, Pinghe , Wen, Jianian et al. Non-contact impact load identification based on intelligent visual sensing technology [J]. | STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL , 2024 , 23 (6) : 3525-3544 .
MLA Zhang, Shengfei et al. "Non-contact impact load identification based on intelligent visual sensing technology" . | STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL 23 . 6 (2024) : 3525-3544 .
APA Zhang, Shengfei , Ni, Pinghe , Wen, Jianian , Han, Qiang , Du, Xiuli , Xu, Kun . Non-contact impact load identification based on intelligent visual sensing technology . | STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL , 2024 , 23 (6) , 3525-3544 .
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Quasi-static tests of full-scale precast canopy beam-column joints with UHPC-filled grouted corrugated ducts connection SCIE
期刊论文 | 2024 , 96 | JOURNAL OF BUILDING ENGINEERING
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Abstract :

The traditional reinforced concrete canopy using cast-in-place (CIP) technology, is associated with problems such as long construction period, high environmental pollution, and low construction quality. Prefabricated assembly technology, due to its modern and highly industrialized characteristics, provides a promising solution to address the mentioned challenges. In this study, an innovative Ultra High-Performance concrete (UHPC)-filled grouted corrugated duct connection (UGCDC) approach was introduced for prefabricated canopy beam-column joints, considering the structural characteristics of the canopy. To evaluate the seismic behavior of canopy beam-column joints utilizing the UGCDC method, three comprehensive full-scale quasi-static experiments were conducted. Meanwhile, relevant seismic behavior indexes were extracted from the hysteresis curve, and the seismic performance of canopy joints was assessed by analyzing the effects of different research parameters on seismic behavior indicators. In addition, based on the OpenSees platform, a fiber finite element model (FEM) was established that incorporated the bond-slip behavior at the UGCDC joint. The research results indicated that the seismic behavior of canopy beam-column joints using UGCDC is basically consistent with that of CIP joints, and setting a shear key in UGCDC joints can improve ductility by 22.4 %. In terms of bearing capacity, there is not much difference among the three specimens, but in terms of initial stiffness, the specimen using UGCDC and shear key and the specimen using UGCDC have increased by 6.0 % and 9.6 % compared to CIP specimen, respectively. The developed FEM can predict the hysteresis characteristic of canopy joints using UGCDC. UGCDC method is a reliable connection form for canopy beam-column connection joint, which is suitable for medium to high intensity earthquake areas. Finally, a seismic performance assessment method of prefabricated canopy beam-column joints using UGCDC was proposed.

Keyword :

Prefabricated canopy Prefabricated canopy Seismic performance Seismic performance Beam-column joints Beam-column joints Simplified fiber model Simplified fiber model UHPC-Filled grouted corrugated ducts UHPC-Filled grouted corrugated ducts connection connection

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GB/T 7714 Su, Sibo , Zhang, Guangda , Han, Qiang et al. Quasi-static tests of full-scale precast canopy beam-column joints with UHPC-filled grouted corrugated ducts connection [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 96 .
MLA Su, Sibo et al. "Quasi-static tests of full-scale precast canopy beam-column joints with UHPC-filled grouted corrugated ducts connection" . | JOURNAL OF BUILDING ENGINEERING 96 (2024) .
APA Su, Sibo , Zhang, Guangda , Han, Qiang , Xu, Li , Zhou, Daxing , Du, Xiuli . Quasi-static tests of full-scale precast canopy beam-column joints with UHPC-filled grouted corrugated ducts connection . | JOURNAL OF BUILDING ENGINEERING , 2024 , 96 .
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Probabilistic model updating of civil structures with a decentralized variational inference approach SCIE
期刊论文 | 2024 , 209 | MECHANICAL SYSTEMS AND SIGNAL PROCESSING
WoS CC Cited Count: 14
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Abstract :

The quantification of uncertainties in civil structures poses a significant challenge due to the need to update a large number of unknown parameters, which can significantly increase the computational workload. A potential solution to this problem is the use of Approximate Bayesian Computation (ABC) approaches, which have gained attention in recent years. However, most existing ABC methods are limited in their ability to handle a large number of unknowns. To address this limitation, this study proposes a decentralized approach for uncertainty quantification in civil structures. In this approach, the structure is divided into several parts, and the uncertainties in each part are estimated independently. The proposed method utilizes the wavelet domain technique to eliminate the interfacial force of the target part and employs a recently developed variational inference approach to quantify the uncertainty in the target substructure. A three-span beam, a 2D truss, and an eight-story building were tested to evaluate the efficiency and feasibility of this approach. The results show that uncertainties in large structures can be estimated and that the proposed method is robust to high levels of measurement noise.

Keyword :

Decentralized Decentralized Variational inference Variational inference Approximated Bayesian computation Approximated Bayesian computation Bayesian inference Bayesian inference

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GB/T 7714 Ni, Pinghe , Han, Qiang , Du, Xiuli et al. Probabilistic model updating of civil structures with a decentralized variational inference approach [J]. | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2024 , 209 .
MLA Ni, Pinghe et al. "Probabilistic model updating of civil structures with a decentralized variational inference approach" . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING 209 (2024) .
APA Ni, Pinghe , Han, Qiang , Du, Xiuli , Fu, Jinlong , Xu, Kun . Probabilistic model updating of civil structures with a decentralized variational inference approach . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2024 , 209 .
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Life-cycle seismic performance of Q690 steel columns with H-section under various bi-directional cyclic loading paths SCIE
期刊论文 | 2024 , 306 | ENGINEERING STRUCTURES
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Abstract :

The ageing effect in the life-cycle assessment should be considered for the high-strength steel structures constructed in corrosive environments and high-seismicity zones. Additionally, the structures can suffer multidimensional seismic excitations because of the spatial effect of ground motions. Therefore, this study aims to investigate the impact of different loading protocols on the mechanical properties of Q690 steel columns with Hsection during the whole life-cycle. Firstly, numerical methods considering time-varying corrosion process are used to simulate the ageing steel columns. After that, the nonlinear hysteretic behaviors of the ageing steel columns under different loading protocols are investigated. The factor of resistance degradation (the degree of degradation of ultimate resistance) is employed to quantify the effect of loading protocols on ageing steel columns. Finally, the biaxial ultimate interaction curve considering the ageing effect and a practical design process are proposed. The findings demonstrate that the steel columns exhibit different mechanical properties under various loading protocols, and the coupling direction of bi-directional displacement loads influences the degree of degradation of ultimate resistance. As service time increases, the factor of resistance degradation of steel columns gradually reduces by up to 40%. The proposed biaxial ultimate interaction curve has acceptable accuracy. These findings emphasize the importance of employing the unfavorable loading protocols in conducting the seismic design of the steel columns in different life-cycle stages.

Keyword :

Life-cycle stages Life-cycle stages Loading paths Loading paths Seismic performance Seismic performance Bi-directional cyclic loading Bi-directional cyclic loading Ageing effect Ageing effect H-section columns H-section columns Corrosion Corrosion

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GB/T 7714 Zhang, Qiang , Han, Qiang , Wen, Jianian . Life-cycle seismic performance of Q690 steel columns with H-section under various bi-directional cyclic loading paths [J]. | ENGINEERING STRUCTURES , 2024 , 306 .
MLA Zhang, Qiang et al. "Life-cycle seismic performance of Q690 steel columns with H-section under various bi-directional cyclic loading paths" . | ENGINEERING STRUCTURES 306 (2024) .
APA Zhang, Qiang , Han, Qiang , Wen, Jianian . Life-cycle seismic performance of Q690 steel columns with H-section under various bi-directional cyclic loading paths . | ENGINEERING STRUCTURES , 2024 , 306 .
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Resilience-based post-earthquake restoration scheduling for urban interdependent transportation-electric power network SCIE
期刊论文 | 2024 | STRUCTURE AND INFRASTRUCTURE ENGINEERING
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Abstract :

As critical lifeline systems, transportation network (TN) and electric power network (EPN) are highly susceptible to natural hazards, such as earthquakes during their service life. At the same time, restoration of damaged TN and EPN is essential to support the post-earthquake reconstruction and emergency rescue in affected areas. Restoration strategies were traditionally developed for TN or EPN separately. However, neglecting the potential interconnection between these two networks in the recovery phase may lead to detrimental consequences, as in real-world scenarios, the obtained strategy may be less efficient or even unfeasible given that recovery of one system is usually dependent on the others for service provision. Accordingly, this paper presents a resilience-based framework for post-earthquake restoration of interdependent transportation-electric power networks. In this framework, restoration independencies and functionality dependencies are introduced to represent the interaction between TN and EPN. Then, a bi-level optimization model with the objective of maximizing seismic resilience is established to characterize the network recovery problem. Furthermore, a solution algorithm that incorporates a genetic algorithm and a chromosome validity test operator is designed to obtain the near-optimal solution. Finally, the proposed framework is illustrated through two numerical examples.

Keyword :

restoration scheduling restoration scheduling Decision optimization Decision optimization electric power network electric power network transportation network transportation network seismic resilience seismic resilience

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GB/T 7714 Zhang, Wangxin , Han, Qiang , Dong, Huihui et al. Resilience-based post-earthquake restoration scheduling for urban interdependent transportation-electric power network [J]. | STRUCTURE AND INFRASTRUCTURE ENGINEERING , 2024 .
MLA Zhang, Wangxin et al. "Resilience-based post-earthquake restoration scheduling for urban interdependent transportation-electric power network" . | STRUCTURE AND INFRASTRUCTURE ENGINEERING (2024) .
APA Zhang, Wangxin , Han, Qiang , Dong, Huihui , Wen, Jianian , Xu, Chengshun . Resilience-based post-earthquake restoration scheduling for urban interdependent transportation-electric power network . | STRUCTURE AND INFRASTRUCTURE ENGINEERING , 2024 .
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Shear Behavior of Y-Shaped Perfobond Rib Shear Connector with UHPC Grout SCIE
期刊论文 | 2024 , 150 (9) | JOURNAL OF STRUCTURAL ENGINEERING
WoS CC Cited Count: 1
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Abstract :

To improve shear capacity, as well as reduce on-site casting and steel consumption, a novel Y-shaped perfobond rib (Y-PBL) shear connector with ultra-high-performance concrete (UHPC) grout was proposed. The shear behavior of the Y-PBL shear connector was investigated by six groups of pushout specimens. Their failure modes, load-slip curves, load-separation curves, strain analysis, and shear transfer mechanisms were discussed. Subsequently, finite-element analysis (FEA) models were established to study the effect of parameters on the shear behavior of the Y-PBL shear connector, as well as to compare the shear capacity contributions with straight-shaped PBL (S-PBL) shear connectors. Analytical models were proposed to predict the shear capacity of the Y-PBL shear connector. The results reveal that the proposed Y-PBL shear connector has superior shear capacity and stiffness. The contribution of the perforating rebar is minor compared with the end-bearing effect of UHPC. The analytical predictions agree well with the experimental and FEA results. This study can be used to guide the design and application of the Y-PBL shear connector in steel-concrete composite bridges.

Keyword :

Ultra-high-performance concrete (UHPC) Ultra-high-performance concrete (UHPC) Perfobond rib shear connector Perfobond rib shear connector Analytical model Analytical model Shear behavior Shear behavior Shear transfer mechanism Shear transfer mechanism

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GB/T 7714 Ni, Yulong , Hu, Menghan , Jia, Zhenlei et al. Shear Behavior of Y-Shaped Perfobond Rib Shear Connector with UHPC Grout [J]. | JOURNAL OF STRUCTURAL ENGINEERING , 2024 , 150 (9) .
MLA Ni, Yulong et al. "Shear Behavior of Y-Shaped Perfobond Rib Shear Connector with UHPC Grout" . | JOURNAL OF STRUCTURAL ENGINEERING 150 . 9 (2024) .
APA Ni, Yulong , Hu, Menghan , Jia, Zhenlei , Han, Qiang . Shear Behavior of Y-Shaped Perfobond Rib Shear Connector with UHPC Grout . | JOURNAL OF STRUCTURAL ENGINEERING , 2024 , 150 (9) .
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Experimental and numerical studies on hysteresis performance of U-shaped SMA-steel plates damper SCIE
期刊论文 | 2024 , 219 | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
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This study developed a novel prefabricated self-centering U-shaped SMA-Steel hybrid plate damper (SMA-SteelUD) based on the excellent characteristics of SMA, to reduce the residual deformation of the conventional Ushaped Steel plate damper under severe earthquakes. The developed SMA-Steel-UD consisted of U-shaped SMA plates (SMA-Us) and U-shaped steel plates (Steel-Us) assembled in parallel, and its working principle was introduced and the analytical model was established. Then, the mechanical properties of SMA plate were firstly investigated experimentally, and the test results showed that the SMA plate behaved large self-centering capacity and great deformability. Subsequently, the quasi-static cyclic loading tests of the components of the damper including U-shaped SMA plate damper (SMA-UD) and U-shaped Steel plate damper (Steel-UD) and the whole damper were carried out to investigate the hysteretic performance, and to further validate the established analytical model. The experimental results showed that the SMA-Steel-UD exhibited satisfactory flag-shape hysteresis behavior with excellent self-centering ability and stable energy dissipation capacity, and owned a large deformation capacity. Parametric studies were further performed to evaluate the influences of the key parameters of SMA-Steel-UD on the hysteretic performance. To ensure the excellent self-centering capacity of the damper, the total self-centering force of the U-shaped SMA plates should be greater than the total yield force of the U-shaped steel plates.

Keyword :

Shape memory alloy (SMA) plate Shape memory alloy (SMA) plate SMA-steel-UD SMA-steel-UD Self-centering capacity Self-centering capacity Hysteresis performance Hysteresis performance Quasi-static cyclic loading test Quasi-static cyclic loading test

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GB/T 7714 Hu, Xiao , Dong, Huihui , Su, Can et al. Experimental and numerical studies on hysteresis performance of U-shaped SMA-steel plates damper [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 219 .
MLA Hu, Xiao et al. "Experimental and numerical studies on hysteresis performance of U-shaped SMA-steel plates damper" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 219 (2024) .
APA Hu, Xiao , Dong, Huihui , Su, Can , Han, Qiang , Du, Xiuli . Experimental and numerical studies on hysteresis performance of U-shaped SMA-steel plates damper . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 219 .
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Seismic performance of RC bridges with double-column medium height bents retrofitted with SCEBs under near-field ground motions SCIE
期刊论文 | 2024 , 22 (5) , 2615-2641 | BULLETIN OF EARTHQUAKE ENGINEERING
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Abstract :

RC double-column medium height bents (DCMBs) are widely applied in the mountain areas as the substructure of highway bridges, and the two columns are normally connected by RC link beams to enhance the lateral stability. However, serious damage and/or large residual displacement were repeatedly observed in the DCMBs after many major earthquakes, which may make the bridges lose functionality and have to be demolished and rebuilt. In order to improve the seismic performance of the bridges, a novel self-centering variable friction dissipation brace (SCVFB) using SMA plates is developed to replace the traditional RC link beams in the DCMBs in this study. The mechanical properties of the shape memory alloy (SMA) plate were investigated experimentally. Then, the analytical model of the DCMBs with inverted-V SCVFBs (DCMB-SVFB) is built, and the corresponding design philosophies of the SCVFB in the DCMB are proposed based on the concept of structural fuse. Subsequently, the hysteretic behaviors of the DCMB-SCVFB in the transverse direction are analyzed, and the dynamic responses of the whole bridge under near-field ground motions are also investigated. For comparison, the seismic behaviors of the bridges with original bents (the bridges with and without link beams) and the bridges retrofitted with buckling restrained braces (BRBs) are also presented. The results show that the SCVFB has stable energy dissipation capability and excellent self-centering ability, even without the need of prestressing. Compared with the original bridge, the bridges with SCVFBs and BRBs are featured by higher strength, larger stiffness, better energy dissipation capacity, and less damage. In particular, the SCVFB can effectively reduce the residual displacement of the bridge and quickly restore the traffic capacity.

Keyword :

Seismic performance Seismic performance Self-centering ability Self-centering ability Shape memory alloy (SMA) plate Shape memory alloy (SMA) plate Self-centering variable friction energy dissipation brace Self-centering variable friction energy dissipation brace RC bridges with double-column medium height bents RC bridges with double-column medium height bents

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GB/T 7714 Dong, Huihui , Hu, Xiao , Du, Xiuli et al. Seismic performance of RC bridges with double-column medium height bents retrofitted with SCEBs under near-field ground motions [J]. | BULLETIN OF EARTHQUAKE ENGINEERING , 2024 , 22 (5) : 2615-2641 .
MLA Dong, Huihui et al. "Seismic performance of RC bridges with double-column medium height bents retrofitted with SCEBs under near-field ground motions" . | BULLETIN OF EARTHQUAKE ENGINEERING 22 . 5 (2024) : 2615-2641 .
APA Dong, Huihui , Hu, Xiao , Du, Xiuli , Wen, Jianian , Han, Qiang . Seismic performance of RC bridges with double-column medium height bents retrofitted with SCEBs under near-field ground motions . | BULLETIN OF EARTHQUAKE ENGINEERING , 2024 , 22 (5) , 2615-2641 .
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