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.
作者
陈令坤
王璐
翟晨程
陈雯昕
朱利明
王尧周
张清华
张楠
李乔
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)
出处
《地球科学》
EI
CAS
CSCD
北大核心
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)。
