摘要
目前在地震海啸接续作用下结构易损性研究中,海啸荷载通常采用规范公式计算,或采用溃坝涌波以及未破碎孤立波等效计算,且简化为静力荷载施加,未考虑海啸波由于浅水效应发生破碎,所形成的破碎孤立波具有更大的冲击力的影响。本文以某钢筋混凝土(reinforced concrete,RC)核心筒-钢制抗弯框架为研究对象,采用双非线性时程分析方法,对结构在地震海啸接续作用下的动力响应和易损性进行分析。海啸荷载采用破碎孤立波进行模拟,海啸荷载时程通过在Fluent软件中监测结构所受的力获得,并以面荷载形式施加于结构外表面。结果表明,与仅地震作用相比,在地震海啸接续作用下,塔台顶部峰值位移海啸影响系数的最大值为0.178,基底峰值剪力海啸影响系数的最大值为0.325,基底峰值弯矩海啸影响系数的最大值为0.276。在罕遇地震和海啸(海啸波高a=10 m,初始水深d=32 m)接续作用下,塔台轻微破坏、中等破坏、严重破坏和倒塌破坏的概率相比仅受海啸作用时分别增加了89.46%、61.54%、16.35%和1.21%。
In current research on the vulnerability of structures under the successive actions of earthquakes and tsunamis,tsunami loads are typically calculated using standard formulas,or equivalently simulated by dam break waves and unbroken solitary waves,and are simplified as static loads.This approach does not account for the breaking of tsunami waves due to shallow water effects,which can lead to a greater impact force from broken solitary waves.This paper focuses on an reinforced concrete(RC)core wall-steel moment-resisting frame.A double nonlinear time-history analysis is employed to investigate the dynamic response and vulnerability of the structure under the successive actions of earthquakes and tsunamis.The tsunami is simulated using a broken solitary wave,and the tsunami load time history is obtained by monitoring the forces on the structure within Fluent software,and then applied to the structure’s external surface as a surface load.The results demonstrate that,compared to seismic action alone,the maximum tsunami influence coefficient for the peak displacement at the top of the tower under the combined action of earthquake and tsunami is 0.178,the maximum tsunami influence coefficient for the peak base shear force is 0.325,and the maximum tsunami influence coefficient for the peak base bending moment is 0.276.Under the combined action of rare earthquakes and tsunamis(tsunami wave height a=10 m,initial water depth d=32 m),the probabilities of minor damage,moderate damage,severe damage,and total collapse of the tower increase by 89.46%,61.54%,16.35%,and 1.21%,respectively,compared to tsunami action alone.
作者
朱兵
张稳
杨万理
ZHU Bing;ZHANG Wen;YANG Wanli(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《地震工程与工程振动》
北大核心
2026年第2期12-24,共13页
Earthquake Engineering and Engineering Dynamics
基金
国家重点研发计划项目(2021YFC3100700)
四川省科技计划项目(2023YFS0429)。
关键词
地震海啸接续作用
多灾害易损性
孤立波
双非线性时程分析
RC核心筒-钢框架塔台
seismic tsunami successive actions
multi-hazard vulnerability
solitary wave
bi-nonlinear time history analysis
RC core tube-steel frame tower
