跨活动断裂带桥梁抗震模拟与性能研究  

Seismic Simulation and Performances Study of Bridges across Active Fault Zones

作　　者：庄庆泰 魏良军 王爽 ZHUANG Qing-tai;WEI Liang-jun;WANG Shuang(China Highway Engineering Consulting Corporation,Beijing 100089,China;Wuhan Longfang Engineering Technology Corporation,Wuhan 430100,China)

机构地区：[1]中国公路工程咨询集团有限公司,北京市100089 [2]武汉隆方工程技术有限公司,武汉市430100

出　　处：《公路》2025年第3期439-449,共11页Highway

摘　　要：跨越活动断裂带的桥梁抗震性能与其抗震设计方案直接相关。以跨越云南鲁甸地震主断裂带“龙树—猴子坡”断裂的桥梁为研究对象,在抗震概念设计基础上给出设计方案,采用数值模拟实现减隔震支座、挡块、伸缩缝、缓冲装置及桩基础的模拟。考虑了近场效应的设计反应谱以及用于模拟断层地面运动的3条人工波和工况组合,从墩柱和桩基的内力响应、弯曲能力和斜截面抗剪强度等3个方面研究结构的抗震性能,分析减隔震支座的地震响应,为跨活动断裂带桥梁结构的抗震设计提供参考。Seismic simulation and performance of bridges across active fracture zones are directly related to the seismic design solutions of the structures.This paper takes the Yingpan Bridge which spans the Ludian earthquake fault zone in Yunnan as the object of study.Seismic design solutions are given on the basis of conceptual design principles for seismic resistance.Simulations of vibration isolation bearings,baffles,expansion joints,buffering devices,and pile foundations are carried out by finite elements.The design response spectrum considering the near-field effect,three artificial waves that used for simulation of fault motion and the combination of operating conditions are studied.The seismic performance of bridge structure is analyzed from the internal force response of pier column and pile,bending capability and shear strength of inclined section of pier column.The seismic response of the damping and isolation bearing are given to provide reference for seismic design of bridge structures across active fault zones.

关 键 词：桥梁抗震 活动断裂带 断层地面运动模拟 抗震性能 减隔震支座 支座时效分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]