地震、波浪联合作用下深水大跨桥梁响应分析  

Response Analysis of Deep-water Large-span Bridges Under the Combined Action of Earthquakes and Waves

作　　者：苏京华 柳春光[1,2] SU Jinghua;LIU Chunguang(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;Institute of Earthquake Engineering,Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024 [2]大连理工大学建设工程学部水利工程学院工程抗震研究所,辽宁大连116024

出　　处：《水利与建筑工程学报》2022年第3期140-146,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金重点项目(51738007)。

摘　　要：深水大跨桥梁在地震作用时同样受到波浪力作用,研究地震、波浪联合作用下桥梁动力响应具有重要意义。通过ANSYS建立一个连续大跨刚构桥的整桥模型,地震波采用天津波与El Centro波,利用辐射波浪理论计算地震作用下内域水动水压力、利用基于频率降低率的附加质量比法计算外域水地震动水压力,利用绕射波浪理论计算波浪力,对比仅地震作用、仅波浪作用、两者联合作用三种工况下桥梁动力响应结果。结果表明,水体存在会增大结构地震动力响应,且增幅与地震波特性、水深、有无内域水等有关;波浪以不同波长所得波浪力施加时结构动力响应不同,影响程度较仅地震作用时小;波浪的存在会影响结构地震动力响应,应合理考虑地震与波浪的关系。Deep-water large-span bridges are also subject to wave force during seismic action,and it is of great significance to analyze the dynamic response of bridges under the combined action of earthquakes and waves.Through ANSYS,a whole bridge model of continuous large span rigid bridge is established,and the seismic wave adopts Tianjin wave and El Centro wave.The water pressure of the inner domain was calculated under the action of the radiated wave theory,while the water pressure of the outer water seismic ground was determined by using the additional mass ratio method based on the frequency reduction rate.Finally,the wave force was calculated by using the diffractive wave theory which was then adopted to compare the dynamic response results of the bridge under three working conditions:seismic effect alone,wave action only and combined action of the two.The results show that the presence of water bodies will increase the seismic dynamic response of the structure,and the increase is related to the seismic portability,water depth,presence or absence of internal water,etc.The structural dynamic response of the waves is different when the wave force is applied at different wavelengths,and the degree of influence is smaller than that of the earthquake;the existence of the wave will affect the seismic dynamic response of the structure,and the relationship between the earthquake and the wave should be reasonably considered.

关 键 词：深水桥梁 地震动水压力 波浪作用 地震、波浪联合作用 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]