海底地震动对近海桥梁易损性影响

PDF(2183 KB)

振动与冲击 ›› 2021, Vol. 40 ›› Issue (17) : 131-136.

论文

海底地震动对近海桥梁易损性影响

王德斌1，李新1，孙治国2，王东升3，陈宝魁4

作者信息 +

Effects of seabed ground motion on vulnerability of offshore bridges

WANG Debin1, LI Xin1, SUN Zhiguo2, WANG Dongsheng3, CHEN Baokui4

Author information +

文章历史 +

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。

Abstract

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.

导出引用

王德斌，李新，孙治国，王东升，陈宝魁. 海底地震动对近海桥梁易损性影响[J]. 振动与冲击, 2021, 40(17): 131-136

WANG Debin, LI Xin, SUN Zhiguo, WANG Dongsheng, CHEN Baokui. Effects of seabed ground motion on vulnerability of offshore bridges[J]. Journal of Vibration and Shock, 2021, 40(17): 131-136

参考文献

［1］胡思聪, 王连华, 李立峰, 等.非一致氯离子侵蚀下近海桥梁时变地震易损性研究［J］.土木工程学报, 2019, 52(4): 62-71.

HU Sicong, WANG Lianhua, LI Lifeng, et al.Time-dependent seismic fragility assessment of offshore bridges subject to non-uniform chloride-induced corrosion ［J］.China Civil Engineering Journal, 2019, 52(4): 62-71.
［2］李辉辉, 李立峰.考虑变量相关性的桥梁时变地震易损性研究［J］.振动与冲击, 2019, 38(9): 173-183.
LI Huihui, LI Lifeng.Bridge time-varying seismic fragility considering variables’ correlation［J］.
Journal of Vibration and Shock, 2019, 38(9): 173-183.
［3］吴文朋, 李立峰.桥梁结构系统地震易损性分析方法研究［J］.振动与冲击, 2018, 37(21): 273-280.
WU Wenpeng, LI Lifeng.System seismic fragility analysis methods for bridge structures［J］.
Journal of Vibration and Shock, 2018, 37(21): 273-280.
［4］马玉宏, 赵桂峰, 邹勤, 等.考虑橡胶支座随机性下隔震与非隔震近海桥梁地震易损性对比［J］.土木工程学报, 2016, 49(增刊1): 49-55.
MA Yuhong, ZHAO Guifeng, ZOU Qin, et al.Comparative analysis of vulnerability for offshore bridges with or without the isolated device considering randomness of the rubber bearing ［J］.China Civil Engineering Journal, 2016, 49(Suppl.1): 49-55.
［5］BOORE D M, SMITH C E.Analysis of earthquake recordings obtained from the seafloor earthquake measurement system (SEMS) instruments deployed off the coast of southern California ［J］.Bulletin of the Seismological Society of America, 1999, 89(1):260-274.
［6］LI Chao, HAO Hong, LI Hongnan, et al.Theoretical modeling and numerical simulation of seismic motions at seafloor ［J］.Soil Dynamics and Earthquake Engineering, 2015, 77: 220-225.
［7］周越, 陈苏, 李小军.基于小波方法的近海域地震动时频特性分析［J］.土木工程学报, 2016, 49(增刊1): 7-12.
ZHOU Yue, CHEN Su, LI Xiaojun.Wavelet-based time-frequency characteristic analysis on offshore ground motion ［J］.China Civil Engineering Journal, 2016, 49(Suppl.1): 7-12.
［8］CHEN B, WANG D, LI H, et al.Characteristics of earthquake ground motion on the seafloor ［J］.Journal of Earthquake Engineering, 2015, 19(6): 874-904.
［9］魏标,杨添涵,蒋丽忠.轨道结构建模精细化程度对高速铁路连续梁桥地震易损性的影响［J］.工程力学,2018,35(4):16-23.
WEI Biao, YANG Tianhan, JIANG Lizhong, The effects of model refinement of ballastless tracks on the seismic vulnerability of a continuous bridge on a high-speed railway［J］.Engineering Mechanics, 2018, 35(4): 16-23.
［10］SHI Y L, LI H W, WANG W D, et al.A fiber model based on secondary development of ABAQUS for elastic-plastic analysis ［J］.International Journal of Steel Structures, 2018, 18(5): 1560-1576.
［11］竺艳容.海洋工程波浪力学［M］.天津: 天津大学出版社, 1991.
［12］WOLF J P.Dynamic soil-structure interaction［M］.Englewood Cliffs, NJ: Prentice Hall Inc., 1985.
［13］VERSTEEG H K, MALALASEKERA W.An introduction to computational fluid dynamics: the finite volume method［M］.Englewood Cliffs, NJ: Prentice Hall Inc., 2007.
［14］LI Chao, HAO Hong, LI Hongnan, et al.Modeling and simulation of spatially correlated ground motions at multiple onshore and seafloor sites ［J］.Journal of Earthquake Engineering, 2017, 21(3): 359-383.
［15］HAO H, OLIVEIRA C S, PENZIEN J.Multiple-station ground motion processing and simulation based on SMART-1 array data ［J］.Nuclear Engineering and Design, 1989, 111(3):293-310.
［16］HAO H, GAULL B A.Estimation of strong seismic ground motion for engineering use in Perth Western Australia［J］.Soil Dynamics and Earthquake Engineering, 2009, 29(5): 909-924.
［17］LUPOI A, FRANCHIN P, PINTO P E, et al.Seismic design of bridges accounting for spatial variability of ground motion ［J］.Earthquake Engineering & Structural Dynamics, 2005, 34(4/5): 327-348.
［18］KIM S H, FENG M Q.Fragility analysis of bridges under ground motion with spatial variation ［J］.International Journal of Non-Linear Mechanics, 2003, 38(5): 705-721.
［19］ZHANG J, HUO Y.Evaluating effectiveness and optimum design of isolation devices for highway bridges using the fragility function method ［J］.Engineering Structures, 2009, 31(8): 1648-1660.