黄土场地条件下地铁车站诱导缝三维地震响应研究  

Seismic response analysis for induced joints of subway station in loess area

作　　者：权登州[1] 王玉铃 柴少波 范智双 卜永红[1] QUAN Dengzhou;WANG Yuling;CHAI Shaobo;FAN Zhishuang;BU Yonghong(School of Civil Engineering,Chang’an University,Xi’an 710061,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《铁道科学与工程学报》2024年第2期721-734,共14页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(42172302);陕西省自然科学基础研究计划资助项目(2020JM-234);西安市建设科技计划资助项目(SZJJ2019-19);中央高校基本科研业务费资助项目(CHD300102282201)。

摘　　要：自20世纪90年代地铁车站结构诱导缝概念提出以来,诱导缝已在我国大、中等城市地铁车站中得到广泛应用,但其抗震性能尚未得到验证。以西安黄土地区地铁车站工程建设为研究背景,基于ABAQUS非线性有限元软件平台,建立黄土场地与地铁车站结构动力相互作用三维数值模型,通过大型地震模拟振动台试验与数值模拟的对比研究,验证了数值模型及分析方法的可靠性。基于上述数值分析方法,进一步建立原型结构数值计算模型,研究不同频谱特性及不同峰值加速度地震波作用下黄土场地中地铁车站诱导缝的地震响应规律。研究结果表明:诱导缝断面处结构更易发生较大水平相对位移而产生破坏,为地铁车站结构的薄弱面,且其两侧结构水平相对滑动沿地铁车站结构从下往上逐渐增大;诱导缝两侧结构竖向相对错动沿地铁车站截面宽度方向呈现出两端较大、中间相对较小的规律;在低频成分丰富的西安人工波作用下,诱导缝处余留纵向钢筋塑性变形发展贯穿整个地震作用过程,塑性应变累积效果更显著。研究结果初步揭示了设诱导缝地铁车站的地震响应特征及规律,对进一步探索设诱导缝地铁车站在地震作用下的结构损伤、破坏发展的内在动力与作用机制有一定参考价值,可为黄土地区地铁地下结构诱导缝的抗震设计提供参考。Since the introduction of the concept of induced joints in subway station structure in the 1990 s,induced joints have been extensively employed in the subway station in large and medium-sized cities in China.However,the seismic performance of induced joints remains unverified.The construction of a subway station in the loess area of Xi'an was taken as the research background.The three-dimensional numerical simulations on the dynamic interaction between the loess site and the subway station structure were conducted using the ABAQUS®nonlinear finite element software program.The reliability of the numerical model and analysis method was verified by comparing the numerical simulation results against those of the shaking table tests.Based on the above numerical methods,the numerical calculation model of prototype structures was further established to study the seismic responses of the induced joint of subway station in loess site under the action of seismic waves with different spectrum and peak acceleration characteristics.The results show that the cross sections of induced joints are more easily destroyed during an earthquake.The horizontal relative slips between both sides of the induced joint increase from the bottom to the top of the structure.The vertical relative displacement of the structures on both sides of the induced joint shows a pattern of larger at both ends and smaller in the middle along the width direction of the subway station section.Under the action of Xi’an artificial waves with abundant lowfrequency components,the plastic deformation of the remaining longitudinal rebar in the cross section of induced joints develops throughout the entire process of seismic action,and the accumulative effect of the plastic deformation is more significant.The research results preliminarily reveal the seismic response characteristics and rules of subway stations with induced joints,which has certain reference value for further exploring the internal dynamics and mechanisms of structural damage and failure develo

关 键 词：黄土地区 地铁车站 诱导缝 数值模拟 地震响应 

分 类 号：TU93[建筑科学—结构工程] U231[交通运输工程—道路与铁道工程]