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学者姓名:韩强

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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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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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Flexural Behavior and Model of Curved Bolt Connections with UHPC Grout and CFRP Tendons for Prefabricated Concrete Panels SCIE
期刊论文 | 2024 , 29 (5) | JOURNAL OF BRIDGE ENGINEERING
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Abstract :

Connections between prefabricated concrete panels (PCPs) are susceptible to cracking and damage, attracting the attention of bridge engineers. Curved bolt connections have ideal flexural performance when they have an appropriate anchorage distance. High-performance materials, such as ultrahigh-performance concrete (UHPC) and carbon fiber-reinforced polymer (CFRP) bars, bring solutions to further reduce construction resources on-site and improve the durability and mechanical properties of curved bolt connections. In this paper, curved bolt connections with UHPC grout and CFRP tendons (UHPC-CFRP connections) for PCPs were proposed. Prediction models for the flexural capacity, cracking moment, and deflection of UHPC-CFRP connections were proposed. Full-scale flexural tests were carried out to study their working mechanism, and their flexural performances were compared with those of ordinary curved bolt connections. Three-dimensional finite-element numerical models were developed, and the influences of important design factors on flexural capacity were discussed. Both experimental and numerical results showed that the flexural behavior of the PCPs with UHPC-CFRP connections is more desirable than that of curved bolt connections with ordinary materials. The improved models are effective for predicting the flexural response of PCPs with UHPC-CFRP connections.

Keyword :

Prefabricated concrete panels (PCPs) Prefabricated concrete panels (PCPs) Flexural performance prediction Flexural performance prediction Curved carbon fiber-reinforced polymer (CFRP) Curved carbon fiber-reinforced polymer (CFRP) Curved bolt connections Curved bolt connections Ultrahigh-performance concrete (UHPC) Ultrahigh-performance concrete (UHPC)

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GB/T 7714 Hu, Menghan , Jia, Zhenlei , Ni, Yulong et al. Flexural Behavior and Model of Curved Bolt Connections with UHPC Grout and CFRP Tendons for Prefabricated Concrete Panels [J]. | JOURNAL OF BRIDGE ENGINEERING , 2024 , 29 (5) .
MLA Hu, Menghan et al. "Flexural Behavior and Model of Curved Bolt Connections with UHPC Grout and CFRP Tendons for Prefabricated Concrete Panels" . | JOURNAL OF BRIDGE ENGINEERING 29 . 5 (2024) .
APA Hu, Menghan , Jia, Zhenlei , Ni, Yulong , Han, Qiang . Flexural Behavior and Model of Curved Bolt Connections with UHPC Grout and CFRP Tendons for Prefabricated Concrete Panels . | JOURNAL OF BRIDGE ENGINEERING , 2024 , 29 (5) .
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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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Seismic performance of the self-centering rocking columns with SMA L-shaped plates SCIE
期刊论文 | 2024 , 60 | STRUCTURES
WoS CC Cited Count: 2
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Abstract :

Shape memory alloy (SMA) as a high-performance material with intelligent properties, has been recognized as a promising alternative solution for achieving self-centering of the structure. In this study, based on the excellent characteristics of SMA, SMA L-shaped plate was developed and applied to install on the rocking interface of the rocking column to enhance the seismic resilience, and the seismic performance of the self-centering rocking columns with SMA L-shaped plates was investigated through experiment and numerical simulation. To this end, the mechanical properties of SMA plate were firstly investigated experimentally. Then the quasi-static cyclic loading tests of the rocking column with SMA L-shaped plates were carried out, and its hysteresis behavior was investigated under different loading protocols with varying displacement amplitudes. For comparison, a rocking column with steel L-shaped plates was also tested. The experimental results showed that the rocking column with SMA L-shaped plates exhibited excellent flag-shape hysteresis behavior with satisfactory self-centering ability and stable energy dissipation capacity, and owned a large deformation capacity. Subsequently, the dynamic responses of the self-centering rocking column with SMA L-shaped plates were investigated by numerical simulation. It is found that compared to the steel L-shaped plates, the SMA L-shaped plates can effectively reduce the residual displacement responses of the rocking column and quickly restore to normal operation.

Keyword :

Seismic performance Seismic performance Self-centering rocking columns Self-centering rocking columns SMA L-shaped plates SMA L-shaped plates Quasi-static cyclic loading tests Quasi-static cyclic loading tests Shape memory alloy (SMA) Shape memory alloy (SMA)

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GB/T 7714 Jia, Xianzhuo , Dong, Huihui , Su, Can et al. Seismic performance of the self-centering rocking columns with SMA L-shaped plates [J]. | STRUCTURES , 2024 , 60 .
MLA Jia, Xianzhuo et al. "Seismic performance of the self-centering rocking columns with SMA L-shaped plates" . | STRUCTURES 60 (2024) .
APA Jia, Xianzhuo , Dong, Huihui , Su, Can , Han, Qiang . Seismic performance of the self-centering rocking columns with SMA L-shaped plates . | STRUCTURES , 2024 , 60 .
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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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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
WoS CC Cited Count: 5
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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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Seismic resilience of RC bridge with self-centering energy dissipation braces using SMA U-shaped plates SCIE
期刊论文 | 2024 , 181 | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
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Abstract :

The seismic resilience-based design of infrastructures is a current hot research topic, and such design is an extension of the performance-based design philosophy. The seismic resilient structures can quickly recover their full functionality by minor or no repair after earthquakes, which considers primarily the structural functionality after repairs and the cost required to restore its functionality. To enhance structural seismic resilience, the application of self-centering energy dissipation braces (SCEBs) is considered as a good solution, in particular, the damaged braces are easy to repair or replace. In this paper, a novel SCEB using the SMA U-shaped plates (SCEBSMAU) is developed, and quasi-static tests are performed to investigate its hysteresis behavior. For comparison, a pure energy dissipation brace using steel U-shaped plates (EDB-SU) is also tested. Then, nonlinear dynamic time history and fragility analysis methods (considering the maximum and residual drift ratios as the engineering demand parameters) are employed to assess the seismic performance of RC bridges with SCEB-SMAUs and EDBSUs. Subsequently, the seismic resilience and economic losses of the bridges with and without braces are further investigated, and a comparative assessment of the bridges with EDB-SUs and SCEB-SMAUs is emphasized in various hazard scenarios. The results show that both SCEB-SMAU and EDB-SU can significantly improve seismic resilience and reduce economic losses. In particular, the EDB-SU can be slightly more effective in improving seismic resilience and reducing economic losses under a small PGA, while SCEB-SMAU is much more effective under a high PGA.

Keyword :

Self-centering energy dissipation brace Self-centering energy dissipation brace Post-earthquake economic losses Post-earthquake economic losses Seismic resilience Seismic resilience RC bridge RC bridge SMA U-Shaped plates SMA U-Shaped plates

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GB/T 7714 Dong, Huihui , Ma, Rui , Han, Qiang et al. Seismic resilience of RC bridge with self-centering energy dissipation braces using SMA U-shaped plates [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 181 .
MLA Dong, Huihui et al. "Seismic resilience of RC bridge with self-centering energy dissipation braces using SMA U-shaped plates" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 181 (2024) .
APA Dong, Huihui , Ma, Rui , Han, Qiang , Du, Xiuli . Seismic resilience of RC bridge with self-centering energy dissipation braces using SMA U-shaped plates . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 181 .
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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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Mechanical model analysis of column-footing joints with combined socket-corrugated pipe connection SCIE
期刊论文 | 2024 , 352 | COMPOSITE STRUCTURES
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Abstract :

The socket connection method is widely used in precast column, particularly in seismic regions. However, reducing the socket-depth to lower costs may lead to shear failure in the socketed part of the columns. To address this issue and achieve cost objectives, a new approach combines shallow sockets with corrugated pipes for column-footing joints. Comparative tests were conducted to investigate failure in columns with socketcorrugated pipe connections (SCPC), shallow sockets (SSC), and cast-in-place (CIP). Furthermore, finite element models were employed to validate the experimental and simplified model results. The findings suggest potential shear failure in shallow socket connections, which can be mitigated by using the combined socketcorrugated pipe method that alters force transmission paths. As the axial load ratio increases, both the ultimate lateral load capacity of the specimen and the local stresses at the column base increase. In addition, the ultimate lateral load capacity of the column and the stress of the connection reinforcement are increased by increasing the strength of the longitudinal reinforcement, consequently amplifying the extent of joint area damage. Finally, a simplified strut-and-tie model of the SCPC, validated against numerical and experimental data, accurately represents force paths, ultimate lateral load capacity and failure modes in socket joints.

Keyword :

Socket-corrugated pipe combination Socket-corrugated pipe combination Prefabricated assembly column Prefabricated assembly column Strut-and-tie model Strut-and-tie model connection connection Force transmission path Force transmission path Numerical analysis Numerical analysis

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GB/T 7714 Si, Xiaolong , Song, Yanchen , Zhang, Guangda et al. Mechanical model analysis of column-footing joints with combined socket-corrugated pipe connection [J]. | COMPOSITE STRUCTURES , 2024 , 352 .
MLA Si, Xiaolong et al. "Mechanical model analysis of column-footing joints with combined socket-corrugated pipe connection" . | COMPOSITE STRUCTURES 352 (2024) .
APA Si, Xiaolong , Song, Yanchen , Zhang, Guangda , Han, Qiang , Du, Xiuli , Liu, Bin . Mechanical model analysis of column-footing joints with combined socket-corrugated pipe connection . | COMPOSITE STRUCTURES , 2024 , 352 .
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