复杂艰险构造区铁路桥梁系统地震响应分析Part Ⅰ:断层效应影响  

Seismic Response of Railway Bridges in Active Complex Tectonic Zones Part Ⅰ: Effects of Fault Effects

作　　者：陈令坤[1,2] 王璐 翟晨程 陈雯昕 朱利明 王尧周 张清华 张楠[5] 李乔[2] Chen Lingkun;Wang Lu;Zhai Chencheng;Chen Wenxin;Zhu Liming;Wang Yaozhou;Zhang Qinghua;Zhang Nan;Li Qiao(College of Architectural Science and Engineering,Yangzhou University,Yangzhou 225127,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;College of Transportation Engineering,Nanjing Tech University,Nanjing 210009,China;SUTCG Railway Transportation Design Institute,Nanjing 210017,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]西南交通大学土木工程学院,四川成都610031 [3]南京工业大学交通运输工程学院,江苏南京210009 [4]苏交科集团轨道交通设计院,江苏南京210017 [5]北京交通大学土木建筑工程学院,北京100044

出　　处：《地球科学》2022年第3期867-879,共13页Earth Science

基　　金：国家重点研发计划“交通基础设施”重点专项(No.2021YFB2600600);2018年度江苏省建设系统科技项目——江苏省防灾减灾抗震“四新”技术专题研究(No.2018ZD039);高速铁路基础研究联合基金项目(No.U1934207);轨道交通安全教育部重点实验室2019年开放基金项目(No.2019JZZ01);湖南创新型省份建设专项经费资助项目(No.2019RS3009);湖南创新型省份建设专项(No.2019RS3009);国家自然科学基金项目(Nos.52178180,51878561);中南大学创新驱动项目(No.502501006)。

摘　　要：近断层地震对桥梁的影响日益引起关注.本研究提出了桥梁‒土‒桩基全局建模方法,强调了更详细的桥墩及土壤非线性的真正好处,它可以比一系列轴载更真实地描述物理现象.协同SHAKE91程序并利用p-y曲线、t-z曲线和q-z曲线建立土‒桩基非线性模型,采用双线性模型模拟桥墩及桩基础的滞回特性,建立不良地质发育区铁路桥梁‒土‒桩基多跨简支梁桥体系模型,计算其弹塑性地震响应,分析A_(p)/v_(p)等对桥梁的弹塑性地震响应的影响.研究结果表明:桥梁横竖向响应受A_(p)/v_(p)影响特点不同,相比墩底固结工况,考虑桩基后桥梁横向地震响应减小;对于竖向响应,在A_(p)/v_(p)>10时桥梁竖向地震响应降低,说明竖向地震在较高频率影响桥梁地震响应.There is a growing worry about the impact of near-fault earthquakes on bridges.This paper presents a bridge-soil-pile foundation global modeling technique that stresses the actual advantages of more comprehensive abutment and soil nonlinearity,which may reflect physical events more accurately than a sequence of axial loads.The nonlinear soil-pile foundation model is established using p-y,t-z,and q-z curves and the SHAKE91 program.The bilinear model is employed to simulate the hysteretic characteristics of the pier and pile;the high-speed railway bridge-soil-pile model is established in this paper.The elastic-plastic seismic response of a high-speed railway bridge subjected to the near-fault ground motions and the A_(p)/v_(p) ratio on the seismic response of the bridge-pile system is analyzed.The results indicate that the A_(p)/v_(p) ratio influences the bridge's lateral and vertical response in different ways.In contrast with the fixed base bridge,the lateral response of the bridge decreases for the bridge-foundation system.On the other hand,for the same bridge-foundation system,the vertical response decreases when A_(p)/v_(p) is greater than 10,which demonstrates the vertical NF ground motion impacts the seismic response of the bridge in the high-frequency range.

关 键 词：近断层地震 铁路桥梁 P-Y曲线 A_(p)/v_(p)工程地质 

分 类 号：P642[天文地球—工程地质学]