摘要
跨越活动断层的桥梁和隧道等工程结构面临巨大的地震风险,断层破裂产生的脉冲效应和永久位移是造成跨断层结构破坏的主要原因。研究跨断层工程的地震响应并采取相应的抗震设防措施显得十分重要,而合理的地震动输入是揭示跨断层结构地震破坏机理的基础。但目前缺乏跨越断层两侧的实际地震动记录,各类规范也没有提供合理的面向跨断层工程的输入地震动的模拟方法。为了分析跨断层工程输入地震动的研究现状,文中总结了相关研究提出的断层区域地震动的几种模拟方法,重点对基于脉冲函数和基于断层物理机制的方法进行详细介绍,分析其特点和存在的问题;综述了在上述方法模拟的断层地震动激励下跨断层梁式桥、缆索承重桥梁的地震响应特征。结果表明:断层地震动非常复杂,模拟方法不仅需要考虑脉冲效应、上下盘效应以及永久位移特征,而且应合理地考虑断层两侧地震动的空间相关性和相干性,才能为跨断层工程提供合理的输入地震动。
Engineering structures such as bridges and tunnels that crossing the fault zone face a greater risk of damage under the effect of earthquakes.The pulse effect and the permanent displacement caused by fault rupture are the main causes of structural damage across the fault.It is very important to research the seismic response of fault-crossing bridges and take corresponding seismic fortification measures.Reasonable ground motion input is the basis to explain the seismic failure mechanism of fault-crossing structures.However,there is currently a lack of actual fault ground motion records across both sides of the fault,and various specifications have not provided reasonable simulation methods for input ground motion for fault-crossing engineering.In order to analyze the research status of input ground motion for fault-crossing structures,this paper summarizes several simulation methods of the ground motions in the fault region.The commonly used methods based on pulse function and fault physical mechanism are introduced in detail,and their characteristics and problems are analyzed.The seismic response characteristics of beam bridges and cable-supported bridges across faults under fault ground motion excitation simulated by the above methods are summarized.The results show that the fault ground motions are very complex.The simulation methods should not only consider the pulse effect,hanging-wall effect and permanent displacement characteristics,but also reasonably consider the spatial correlation and coherence of ground motion on both sides of the fault,so as to provide reasonable input ground motion for fault-crossing structures.
作者
盛兆琦
胡进军
谢礼立
SHENG Zhaoqi;HU Jinjun;XIE Lili(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2023年第1期1-13,共13页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金重点项目(U1939210,U2139207)
四川省交通运输科技项目(2018-ZL-01)。
关键词
跨断层桥梁
输入地震动
地震动模拟
地震响应
脉冲型地震动
fault-crossing structure
input ground motion
ground motion simulation
seismic response
pulse type ground motion
作者简介
盛兆琦(1997-),男,硕士研究生,主要从事地震工程方面的研究.E-mail:shengzhaoq.iem@qq.com;通讯作者:胡进军(1978-),男,研究员,博士,主要从事地震动模型与强度指标方面的研究.E-mail:hujinjun@iem.ac.cn。
