Bearing Simulation in Seismic Response Analysis of a Multi-Span Continuous Girder Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 1029-1033
Author(s):  
Yong Huang ◽  
Jun Jie Wang ◽  
De Yin Jin
Keyword(s):  
Seismic Performance ◽  
Response Analysis ◽  
Restoring Force ◽  
The Wenchuan Earthquake ◽  
Before And After ◽  
Continuous Girder Bridge ◽  
Girder Bridge ◽  
Bearing Damage ◽  
Strong Ground ◽  
Made In

The damage of bearing will change the boundary condition for whole bridge, if we do not take account of bearing failure, the error of structural analysis and the unreasonable in design will be made. In this paper, the effect of possible bearing damage to whole bridge during strong ground motion is studied through examining the seismic performance of a multi-span continuous girder bridge which is a real damaged bridge during the Wenchuan earthquake in 2008. Proper analytical restoring force models of bearings are proposed, which can simulate the seismic performance of the bridge before and after the bearing damage suitably.

Test and Numerical Study on the Seismic Performance of A Cable Restrainer for Girder Bridges

2019 ◽  
Author(s):  
Yitong Gu ◽  
Wancheng Yuan ◽  
Xinzhi Dang
Keyword(s):  
Seismic Performance ◽  
Numerical Study ◽  
Design Method ◽  
Lateral Displacement ◽  
Static Test ◽  
Girder Bridges ◽  
Continuous Girder Bridge ◽  
Service Conditions ◽  
Girder Bridge ◽  
Parametric Analyses

<p>In China, most of the support systems applied by short/medium span bridges are elastomeric pad bearings (EPBs). This type of support system has no reliable connections between bearings and girders as well as bearings and piers, which will cause structural damages due to large lateral displacement of bearings under earthquakes. The restrainers used currently could restrict the deformation of bridges under normal service conditions and could only restrict unidirectional displacement. Considering the disadvantages of these restrainers, a new restrainer called Connected Cable Restrainer (CCR), which can be used in short/medium span bridges supported by EPBs, is developed in this paper. The design principle, basic configuration, isolation mechanism and the design method of CCR are introduced. A pseudo static test to study the seismic performance of CCR is conducted. Seismic responses of a 3-span continuous girder bridge with CCR are simulated using OpenSees platform and parametric analyses of the two main parameters, lateral restraining displacement and restraining stiffness, are also carried out. Results show that the deformation of bridges under normal service conditions would not be restrained using CCR and the displacement responses can be mitigated effectively by using CCR through parameter optimization.</p>

Experimental Study for Seismic Performance of Confined Masonry Structure

2013 ◽  
Vol 353-356 ◽  
pp. 1826-1831
Author(s):  
Tie Jun Qu ◽  
Yan Ping Wang ◽  
Xian Yun Wang
Keyword(s):  
Seismic Performance ◽  
Dynamic Test ◽  
Hysteresis Loops ◽  
Structural Response ◽  
Time History ◽  
Design Code ◽  
Restoring Force ◽  
Static Test ◽  
Confined Masonry ◽  
Made In

A two-story masonry housing model was made in this paper. According to Intensity 7, adjusted Northridge record was selected to be the ground motion input in the pseudo-dynamic test. Pseudo-dynamic test and pseudo-static test were carried out to investigate the seismic behavior of the model structure. The time-history curves of the acceleration, velocity, displacement and restoring force of the structural response were obtained besides the time-history curves of the measuring points of the structure. Also the steel strain of the tie-columns and the hysteresis loops of the structure were obtained. The result shows multi-story confined masonry structures possess superior seismic performance if coordinated with the provision specified in the current compulsory design code and it can continue to use after appropriate dressing under the rarely earthquake.

scholarly journals Seismic Mitigation of Curved Continuous Girder Bridge Considering Collision Effect

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 129
Author(s):  
Zhengying Li ◽  
Shaobo Kang ◽  
Chuan You
Keyword(s):  
Steel Wire ◽  
Element Model ◽  
Response Analysis ◽  
Prevention Measures ◽  
Curved Bridges ◽  
Viscoelastic Dampers ◽  
Lead Rubber Bearing ◽  
Continuous Girder Bridge ◽  
Girder Bridge ◽  
Seismic Mitigation

Due to structural irregularity, curved bridgesaremore likely to cause non-uniform collisions and unseating between adjacent components when subjected to earthquakes. Based on the analysis of the collision response of curved bridges duringearthquakes, and according to the seismic characteristics of curved bridges, research was carried out on pounding mitigation and unseating prevention measures. A curved bridge with double column piers was taken as an engineering example, and a finite element model of curved bridges thatcould consider the non-uniform contact collision between adjacent components was built with ABAQUS software. Viscoelastic dampers, viscous dampers, and a lead rubber bearing were selected as the damping devices, and a steel wire rope-rubber mat was used as the pounding mitigation device to form the combinatorial seismic mitigation system. Based on the principle of energy dissipation combined with constraints, three kinds of combined seismic mitigation case were determined; a seismic response analysis was then performed. The results indicated that the three kinds of combined seismic case were effective atreducing the response topounding force, stress, damage, girder torsion and displacement, and achieved the goals of seismic mitigation and unseating prevention.

Seismic Performance Analysis of a Continuous Girder Bridge with Precast Segmental Pier

2011 ◽  
Vol 250-253 ◽  
pp. 1966-1970 ◽  
Author(s):  
Ji Ping Ge
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Plastic Hinge ◽  
Bridge Columns ◽  
Concrete Bridge ◽  
Reinforced Concrete Bridge ◽  
Continuous Girder Bridge ◽  
Girder Bridge ◽  
Plastic Hinge Method ◽  
Segmental Bridge

Based on available research results of precast segmental bridge pier, seismic performance of a continuous girder bridge with precast segmental bridge columns using match-cast dry joints was analyzed with the lumped plastic hinge method verified by experiment, the similarities and differences of seismic performance between the continuous girder bridge with precast segmental bridge columns and that of cast-in-placement reinforced concrete bridge columns were gained. Results show that the maximum displacement response of the continuous girder bridge with precast segmental bridge columns is bigger than that of the continuous girder bridge with cast-in-place reinforced concrete bridge columns. While for the residual displacement, the opposite is true. The reason is that the restoring force exists in the precast segmental bridge pier by the prestress strands. The concentrated plastic hinge method for cast-in-place reinforced concrete bridges could be used to bridges with precast segmental bridge columns.

Seismic Performance of Ductile Steel Moment-Resisting Frames Subjected to Multiple Strong Ground Motions

2019 ◽  
Vol 35 (1) ◽  
pp. 289-310 ◽  
Author(s):  
Randy Tenderan ◽  
Takanori Ishida ◽  
Yu Jiao ◽  
Satoshi Yamada
Keyword(s):  
Ductile Fracture ◽  
Ground Motion ◽  
Seismic Performance ◽  
Ground Motions ◽  
Cumulative Damage ◽  
Response Analysis ◽  
Steel Moment Resisting Frames ◽  
Strong Ground Motions ◽  
Moment Resisting ◽  
Strong Ground

This study evaluates the seismic performance of steel moment-resisting frames (SMRFs) under multiple strong ground motions. The cumulative damage of beam members is used as the main damage index. A cumulative damage formula is generated based on the experimental results of the steel beam-to-column connection test considering the ductile fracture. Local buckling of members is not considered in this study. Six SMRF models with two parameters (the number of stories and the strength of the column base) are analyzed by conducting an inelastic response analysis. Three different ground motion intensities (peak ground velocity = 0.5 m/s (design level), 0.75 m/s, and 1.0 m/s), each with five repeated excitations are used in the inelastic response analysis to simulate the occurrence of multiple strong ground motions. Stable behavior with a linear increment in cumulative damage is found in most cases, especially when the ground motion intensity is equal to the design level. However, when the intensity is greater than the design level, both ductile fracture and weak story collapse are observed in several cases.

The Anti-Seismic Performance of the Viscous Damper and E Shaped Steel Bearing

2011 ◽  
Vol 368-373 ◽  
pp. 1117-1120
Author(s):  
Ling Jun Kong ◽  
Yan Bei Chen ◽  
Xiang Liang Ning ◽  
Qi Bin Jiang
Keyword(s):  
Seismic Performance ◽  
Computational Models ◽  
Hysteresis Loops ◽  
Time History ◽  
Viscous Damper ◽  
Related Data ◽  
Large Hysteresis ◽  
Continuous Girder Bridge ◽  
Girder Bridge ◽  
Nonlinear Time History

To study the anti-seismic performance of the viscous damper and the E shaped steel bearing on the continuous girder bridge, two models of the Taibai bridge located in Xi’an are analyzed by the nonlinear time-history method and the Midas/Civil software, considering the interaction between pile and soil. The related data are obtained through the two computational models. The results show that the bending moments and shear forces of the bottom of the fixed pier are reduced and it is effective to reduce the displacements of the top of the fixed pier and the end of the girder. And, the viscous damper and the E shaped steel bearing form the large hysteresis loops, dissipate the earthquake energy and reduce the earthquake response of the bridge.

Study on Seismic Performance of Reinforced Concrete Multi-Span Cantilever Girder Bridge after Reinforcement

2013 ◽  
Vol 401-403 ◽  
pp. 728-733
Author(s):  
Xiu Fang Li ◽  
Rui Fu Wu
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Seismic Performance ◽  
Response Spectrum ◽  
Element Model ◽  
Structural Dynamic ◽  
Subspace Iteration ◽  
Practical Project ◽  
Before And After ◽  
Girder Bridge

Basing on the reinforcement of a practical project, which is a reinforced concrete multi-span cantilever girder bridge, by changing section properties to improve the bearing capacity and seismic performance of the bridge. Then, a finite element model is established and solved by using the subspace iteration method, the frequency and vibration type is compared that of the bridge before and after reinforcement, the effectiveness of the new method on the structural dynamic characteristic is verified at the same time. Then, the seismic response of the bridge is calculated and analyzed by using the response spectrum method, which can provide method for reinforcement of similar bridge.

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