跨走滑断层简支梁桥模型试验研究  

Model test study on simply supported beam bridge model crossing strike-slip fault

作　　者：谢礼立[1,2] 陈睿致 徐龙军 刘秒 Xie Lili;Chen Ruizhi;Xu Longjun;Liu Miao(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;State Key Laboratory of Precision Blasting,Jianghan University,Wuhan 430056,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,哈尔滨150080 [2]江汉大学精细爆破国家重点实验室,武汉430056

出　　处：《东南大学学报（自然科学版）》2024年第3期513-523,共11页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金重点资助项目(U2139207);湖北省自然科学基金(创新群体)重点资助项目(2023AFA030)。

摘　　要：为了探究简支梁桥在地震(活动断层)作用下反复出现的落梁震害的发生原因及其破坏模式,根据试验功能和模型参数需求,设计制作了一套能够模拟断层两盘间产生相对三维运动的试验装置.以跨越走滑断层的简支梁桥为研究对象,通过模型试验研究了其在断层作用下的损毁过程,分析了落梁破坏特征和结构失效模式.结果表明:支座布置显著影响落梁行为,主梁移动、倾斜等过程会加剧桥墩损伤,并可能诱发桥梁的进一步垮塌;断层错动引起土体挤压效应,导致近断层区土压力普遍上升,边跨区土压力变化较小,桩基不同深度土压力变化呈现特定顺序.试验所得数据和结论能够为后续研究提供试验参考,有助于指导未来抗震设计和结构的断层适应性设计.A set of experimental apparatus capable of simulating the relative three-dimensional motion between two fault plates was designed and manufactured according to the test function and model parameter requirements to investigate the causes and failure modes of the repeated“beam falling”seismic damage of simply supported beam bridges under earthquakes(active faults).Taking a simply supported beam bridge crossing a strike-slip fault as the research object,the damage process under fault action was studied through model tests,and the failure characteristics and structural failure modes of girder falling were analyzed.The results show that the bearing arrangement significantly affects the girder falling behavior,and the processes such as main girder movement and tilting can aggravate the damage of bridge piers and may induce further collapse of bridges;the fault dislocation causes the soil compression effect,causing a general increase in earth pressure in the near-fault zone,while the earth pressure changes in the side-span zone are relatively small,and the earth pressure changes at different depths of pile foundations exhibit a specific order.The data and conclusions obtained from the experiments can provide experimental references for subsequent research and help guide future seismic design and fault-adaptive design of structures.

关 键 词：跨断层桥梁 活断层 试验装置 桥梁支座 倒塌分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]