考虑桩-土相互作用的大跨钢桁架-混凝土斜拉桥地震响应研究  

Study on the Seismic Response of Long-span Steel Truss-concrete Cable-stayed Bridge Considering Pile-soil Interaction

作　　者：陈平 CHEN Ping(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430000,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430000

出　　处：《交通科技》2023年第3期90-93,98,共5页Transportation Science & Technology

摘　　要：对于深桩基础的半漂浮体系斜拉桥,在抗震分析中采用刚性地基进行假定处理偏不安全。为探究桩-土相互作用对斜拉桥地震响应的影响,文中结合实际工程,基于黏弹性吸收边界,通过有限元方法模拟桩-土接触行为,研究土体-桩基-桥墩-上部结构系统在地震作用下的动力响应。结果表明,考虑桩-土相互作用后,桥梁结构整体位移与主梁内力增加,下部结构内力减小。In the seismic analysis of the semi-floating cable-stayed bridge with deep pile foundation,it is unsafe to use the rigid base assumption.To explore the influence of pile-soil interaction on the seismic response of bridge,based on a practical engineering and the viscoelastic absorption boundary theory,the pile-soil contact behavior is simulated by finite element method.The dynamic response of the soil-pile-pier-superstructure system under the earthquake action is studied.The results show that the overall displacement of the structure and the internal force of the main beam increase as considering the pile-soil interaction,and the internal force of the substructure decreases.

关 键 词：土-结构动力相互作用 地震分析 斜拉桥 结构动力响应 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]