摘要
为研究海底地震动作用下桥梁的抗震性能,以某近海桥梁引桥段为例,利用ABAQUS软件建立其有限元分析模型。基于一维波动理论与流体动力学方程,利用谱表示法模拟海底地震动。采用概率性地震需求分析方法(PSDA)对桥梁进行易损性分析,分别绘制桥墩在海底和陆地地震动作用下的超越概率曲线并对比分析。结果表明:相对于陆地地震动,海底地震动会显著增加桥墩的损伤概率,最大增幅高达23.44%;同时,对比于陆地地震动,海底地震动作用下桥梁易损墩柱发生变化。可见,基于陆地地震动进行近海桥梁抗震性能研究会低估桥墩的损伤并错估桥梁易损部位,导致计算结果失准。
Here,to study seismic performance of bridges under offshore ground motion,taking the approach segment of a certain offshore bridge as an example,its finite element analysis model based on ABAQUS was established.Based on the 1-D wave theory and hydrodynamic equation,the spectral representation method was used to simulate offshore ground motion.The vulnerability of the bridge was analyzed by using the probabilistic seismic demand analysis(PSDA)method,and transcendental probability curves of bridge piers under offshore and onshore ground motions,respectively were drawn and analyzed contrastively.The results showed that compared with onshore ground motion,offshore ground motion can significantly increase the damage probability of piers,and the maximum increase amplitude reaches 23.44%;compared with onshore ground motion,the bridge vulnerable pier column changes under offshore ground motion;the seismic performance study of offshore bridges based on onshore ground motion can underestimate damage of piers and mis-estimate bridge’s vulnerable parts to cause inaccurate calculation results.
作者
王德斌
李新
孙治国
王东升
陈宝魁
WANG Debin;LI Xin;SUN Zhiguo;WANG Dongsheng;CHEN Baokui(School of Civil Engineering,Dalian Jiaotong University,Dalian 116028,China;School of Civil Engineering,Institute of Disaster Prevention,Beijing 101601,China;School of Civil and Transporting Engineering,Hebei University of Technology,Tianjin 300401,China;School of Architecture Engineering,Nanchang University,Nanchang 330031,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第17期131-136,174,共7页
Journal of Vibration and Shock
基金
国家重点研发计划(2016YFC0701108)
国家自然科学基金(51678150)
辽宁省自然科学基金(20170540134)
大连理工大学海岸和近海工程国家重点实验室基金(LP1617)。
关键词
桥梁工程
连续梁桥
易损性曲线
海底地震动
数值分析
bridge engineering
continuous beam bridge
vulnerability curve
offshore ground motion
numerical simulation
