近断层桥梁水平向抗震设计规准反应谱修正  

Modification of the horizontal seismic design gauge response spectrum for near-fault bridges

作　　者：谢皓宇 于雯 唐光武 刘海明[1,2] 刘怀林 XIE Haoyu;YU Wen;TANG Guangwu;LIU Haiming;LIU Huailin(State Key Laboratory of Bridge Safety and Resilience,Chongqing 400067,China;CMCT Research&Design Institute Co.,Ltd.,Chongqing 400067,China;Road&Bridge International Communication Technology Co.,Ltd.,Beijing 101399,China)

机构地区：[1]桥梁工程安全与韧性全国重点实验室,重庆400067 [2]招商局重庆交通科研设计院有限公司,重庆400067 [3]中交路建交通科技有限公司,北京101399

出　　处：《地震工程与工程振动》2025年第1期187-194,共8页Earthquake Engineering and Engineering Dynamics

基　　金：重庆市自然科学基金项目(CSTB2023NSCQ-MSX0775);重庆市交通科技项目(CQJT-ZCXM2024-07);国家自然科学基金项目(12032008)。

摘　　要：现行桥梁抗震设计规范中设计反应谱主要基于远场观测记录获得,不能准确反映近断层区域的地震动特性和结构地震响应特性,因此近断层区域的桥梁抗震设计可能偏于不安全。基于此,通过美国太平洋地震研究中心数据库按照震源距、矩震级以及地面峰值加速度(peak ground acceleration,PGA)为原则筛选了近断层地震动时程,以场地地基条件和PGA作为分组原则计算了平均谱,再基于最小二乘分段拟合方法对其标定,得到了近断层地震水平向设计规准反应谱的放大系数、衰减指数以及特征周期等3项主要参数的统计推荐值,最后调整并提出了考虑近断层地震特性的规准反应谱,可以为我国桥梁抗震设计规范中近断层地震动作用的体现提供依据。The current seismic design codes for bridges primarily rely on design response spectra derived from far-field observational records,which fail to accurately reflect the ground motion characteristics and structural seismic response characteristics in near-fault regions.As a result,the seismic design for bridges in near-fault regions may be unsafe.To address the issue,near-fault ground motion time histories are selected from the Pacific Earthquake Engineering Research Center(PEER)database based on principles including source distance,moment magnitude,and peak ground acceleration(PGA).Average spectra are calculated using site foundation conditions and PGA as grouping principles,and then calibrated using a least-squares piecewise fitting method.This process yields statistical recommendations for three key parameters of the near-fault horizontal design gauge response spectrum:amplification factor,attenuation index,and characteristic period.Finally,adjustments were made to propose a gauge response spectrum that considers near-fault earthquake characteristics,providing a basis for incorporating near-fault ground motion effects into China s seismic design codes for bridges.

关 键 词：桥梁抗震设计 近断层地震动 最小二乘标定 水平向设计反应谱 

分 类 号：P315.9[天文地球—地震学]