Page 282 - 《振动工程学报》2025年第8期

第 38 卷第 8 期 振 动 工 程 学 报 Vol. 38 No. 8
2025 年 8 月 Journal of Vibration Engineering Aug. 2025

近断层峡谷场地深水刚构桥地震响应参数

敏感性研究

孟思博 ， 魏石涛 ， 刘中宪 1，2 ， 程 喜 ， 李文轩 2
2
1
3
（1. 天津城建大学天津市土木建筑结构防护与加固重点实验室，天津 300384； 2. 天津城建大学土木工程学院，
天津 300384； 3. 中铁十九局集团广州工程有限公司， 广东 广州 511455）

摘要: 峡谷地区大量高墩刚构桥位于近地震活动断层（以下简称近断层）区域，若跨河流或位于库区等有水环境，其抗震分析应
综合考虑近断层效应、场地效应和流固耦合作用，目前多采用近断层地震记录作为一致输入，可能低估桥梁地震响应，且对震
源、场地参数与桥梁地震响应相关性缺乏探讨。本文结合随机有限断层法和边界元法生成近断层上覆水层峡谷场地多维多点
地震动加速度，开展近断层峡谷场地深水大跨高墩刚构桥地震响应分析。以从震源到结构全物理过程的视角，研究桥墩、支座
响应对震源、场地参数的敏感性。结果表明：桥梁地震响应对断层破裂面尺寸最为敏感，整体上，震源参数对桥梁地震响应的
影响较场地参数更为显著；场地效应导致主墩纵、横桥向曲率延性比均值相差 85%、88%；桥梁主墩和支座对各参数敏感性存
在差异；断层倾角处于 33°~60°之间时，桥梁地震响应呈现先增大后减小的趋势，主墩曲率延性比可相差 35%；水层对地震动
具有抑制效应，但动水压力对其地震响应的放大作用更突出。
关键词: 近断层地震动； 局部场地效应； 深水刚构桥； 敏感性
+
中图分类号: U441 .2 文献标志码: A DOI：10.16385/j.cnki.issn.1004‑4523.202309066

Parametric sensitivity study of seismic response for deep-water

rigid frame bridge in near-fault canyon sites

1，2
3
1
2
MENG Sibo ， WEI Shitao ， LIU Zhongxian ， CHENG Xi ， LI Wenxuan 2
（1.Tianjin Key Laboratory of Structural Protection and Reinforcement for Civil Engineering and Architecture，
Tianjin Chengjian University， Tianjin 300384， China； 2.School of Civil Engineering， Tianjin Chengjian University，
Tianjin 300384， China； 3.China Railway 19th Bureau Group Guangzhou Engineering Co.， Ltd.， Guangzhou 511455， China）
Abstract: A large number of high-pier rigid frame bridges in the canyon areas are located in near-fault regions （hereinafter referred
to as near-fault）， and the seismic analyses should comprehensively consider the near-fault effect， site effect， and fluid-structure in‑
teraction when they are located in the water environment such as rivers， reservoirs， etc. Currently， most near-fault seismic records
are used as consistent inputs， which may underestimate the seismic response of the bridges. At the same time， the discussion on
the correlation between the seismic sources， site parameters， and seismic response of the bridges is unexplored. In this paper， the
stochastic finite fault method and the boundary element method are combined to generate the multi-dimensional and multi-point
ground motions of the overlying water-layer canyon sites near faults， and the analysis of the seismic response of the deep-water，
large-span， high-pier rigid frame bridge in the near-fault canyon site is developed. The sensitivity of the response of piers and bear‑
ings to the seismic source and site parameters is investigated from the perspective of the whole physical process between the seismic
source and the structure. The results indicate that the bridge response is most sensitive to the rupture surface size. On the whole，
the influence of source parameters on the bridge response is more significant than that of site parameters. The site effect leads to the
difference of the mean values of curvature ductility ratios of two main piers in longitudinal and transverse directions to be 85% and
88%. There are differences in the sensitivities of the main piers and bearings to each parameter. When the dip angle of the fault is
between 33°~60°， the seismic response of the bridge shows a trend of increasing first and then decreasing， and the curvature ductili‑
ty ratio of the main pier can differ by 35%. The water layer has an inhibitory effect on ground motions； however， the amplification
effect of hydrodynamic pressures on the seismic response of the bridge is more prominent.

收稿日期: 2023‑09‑23； 修订日期: 2023‑11‑23
基金项目: 国家自然科学基金资助项目（52238012）；天津市自然科学基金资助项目（22JCQNJC00030）