To study the improvement effect of different seismic reinforcement methods on the seismic performance of service beam bridges, the seismic performance of piers and bearings of bridges during frequent ground motion, rare ground motion and very rare ground motion is evaluated based on the vulnerability analysis method of incremental dynamic analysis(IDA). Three seismic reinforcement methods have been designed for engineering comparison, including wrapping fiber reinforced polymer(FRP)materials around piers, installing metal dampers, and installing cable restrainer. The finite element dynamic analysis model of the whole bridge was established with the help of OpenSees platform. Considering the uncertainty of ground motion and traveling wave effects, 130 ground motions were selected for IDA to obtain IDA curve clusters of uniform excitation and non-uniform excitation ground motion. Based on the capacity-demand ratio model, the curvature and displacement are used as damage measures to define the seismic damage states of piers and bearings respectively, and the seismic vulnerability curves are plotted to conduct a vulnerability comparison analysis of the seismic performance of bridges under different seismic strengthening methods. The research results show that: wrapping FRP materials has a significant effect on improving the seismic performance of bridge piers. After adopting the FRP reinforcement scheme, the probability of pier being slightly damaged under very rare ground motion can be reduced by 53.73%; The installation of metal dampers can effectively control the degree of bearing damage. Under major earthquake, the probability of the bearing exceeding a slight damage state after shock absorption is only 13.57%, and the bearing is likely to be in intact state; The installation of cable restrainer has little benefit in improving the seismic performance of bridges; Considering the traveling wave effect will reduce the damage exceeding probability of the pier, Compared with the damage exceeding probability of the pier under uniform excitation ground motion, before and after adopting FPR seismic reinforcement measures, the reduction amplitude of damage exceeding probability under non-uniform excitation ground motion of the pier is 19.88% and 22.07%, respectively. The traveling wave effect has little effect on the damage exceeding probability of the bearing.
SuWei, LiXiao-bo, WangYu-quan, et al. Explicit analytical method for typical isolated system of railway bridges[J]. Journal of Railway Science and Engineering, 2025, 22(2): 712-722.
LiLi-feng, TangJia-hao, HuRui, et al. Evaluation method of reasonable aseismic system for medium-span continuous girder bridges based on fragility[J]. Journal of Railway Science and Engineering, 2022, 19(12): 3665-3677.
[9]
LiJian-ning, YuLu-song, LiZi-qi, et al. Study on seismic performance of long-span railway continuous girder bridges in high seismic intensity region[J]. International Journal of Critical Infrastructures, 2020, 16(4): 310-327.
[10]
XiaXiu-shen, WuSui-wen, WeiXing-han, et al. Experimental and numerical study on seismic behavior of a self-centering railway bridge pier[J]. Earthquakes and Structures, 2021, 21: 173-183.
HuDong-yang, LiCong-lin, ChenKe-jian, et al. Research on application of damping tenon in high-speed railway continuous beam bridges in high-intensity seismic area[J]. Journal of Railway Science and Engineering, 2021, 18(9): 2255-2263.
LinYuan-zheng, TianShi-zhu. Tests for aseismic performances of a RC continuous girder bridge retrofitted by FRP jacket[J]. Journal of Vibration and Shock, 2016, 35(5): 21-26, 38.
ZhuLi-hua, LiGang, DongZhi-qian, et al. An experimental study and numerical simulation of lattice-shaped friction devices[J]. Journal of Vibration and Shock, 2020, 39(4): 96-105.
[21]
ZhouL X, WangX W, YeA J. Low cycle fatigue performance investigation on transverse steel dampers for bridges under ground motion sequences using shake-table tests[J]. Engineering Structures, 2019, 196: No.109328.
LiJian-zhong, TangHu. Study on transverse seismic design of small and medium span bridges with elastomeric bearing pads[J]. China Civil Engineering Journal, 2016, 49(11): 69-78.
LiYue, LiZhi, LiChong. Bridge vulnerability under the influence of bearing friction-slip and performance degradation of stoppers[J]. China Civil Engineering Journal, 2020, 53(Sup.2): 280-287.
HanLu-lu. Research of reinforcement of existing simply supported girder bridge based on seismic vulnerability[D]. Chengdu: School of Civil Engineering,Southwest Jiaotong University, 2020.
XiangChang-sheng, ZhaoJing. Influence of different dampers on transverse seismic performance of continuous beam bridges[J]. Journal of Shenyang Jianzhu University(Natural Science),2022, 38(1): 102-110.
ZhouYing, GuAn-qi. Displacement-based seismic design of self-centering shear walls under four-level seismic fortifications[J]. Journal of Building Structures, 2019, 40(3): 118-126.