摘要
基于ABAQUS软件建立了大开洞连体并行地铁地下车站结构的三维有限元数值模型,考虑近远场地震波的频谱特性、混凝土塑性变形及损伤的影响,数值模拟了不同地震类型作用下,连体并行地铁车站结构非线性地震反应特性的差异.结果表明:地震波的频谱特性对连体并行地铁车站结构的动力响应及损伤有很大影响,地震波主频率与结构自振频率越接近,结构损伤越严重;连体并行地铁车站结构拉、压损伤分布呈左右对称,开洞侧墙的顶部和底部、洞口两侧45°扇形范围内结构的楼板及中柱损伤最为严重;连体并行地铁车站结构侧墙开洞比例小于1/3时,开洞层的位移变化率最大,具有显著的空间效应,应当按空间问题进行地震反应分析,当侧墙开洞比例大于2/3时,开洞层的位移变化率不变,可近似按平面应变问题处理.研究成果对提高该类地铁车站结构的抗震性能提供了合理的参考与指导.
Based on ABAQUS software,a three-dimensional finite element numerical model of connected parallel subway station structures with large openings was established.Considering the spectral characteristics of near-far field seismic waves,the influence of concrete plastic deformation and damage,the difference of nonlinear seismic response characteristics of connected parallel subway station structures under different earthquake types was simulated.Results show that the spectral characteristics of seismic waves have a great influence on the dynamic response and damage of connected parallel subway station structures.The closer the main frequency of seismic waves and the natural frequency of structures are,the more serious the damage is.Tensile and compressive damage distribution of the connected parallel subway station structure is left-right symmetrical,with the floor and center pillar of the structure in the 45 sector range at the top and bottom of the side wall with openings and both sides of the openings being the most seriously damaged.When the opening ratio of the side wall of the connected parallel subway station structure is less than 1/3,the displacement change rate of the opening layer is the largest,which has significant spatial effect.Seismic response analysis should be carried out according to the spatial problem.When the opening ratio of the side wall is greater than 2/3,the displacement change rate of the opening layer is unchanged,which can be treated approximately according to the plane strain problem.The research results provide reasonable reference and guidance for improving the seismic performance of such subway station structures.
作者
韩学川
陶连金
刘春晓
安韶
吴晓娲
HAN Xuechuan;TAO Lianjin;LIU Chunxiao;AN Shao;WU Xiaowa(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Bejjing University of Technology,Beijing 100124,China)
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2020年第8期929-939,共11页
Journal of Beijing University of Technology
基金
国家自然科学基金资助项目(41877218,41572276)。
关键词
连体并行地铁车站结构
地震响应
数值分析
塑性损伤
地下结构
土与结构相互作用
connected parallel subway station structure
earthquake response
numerical analysis
plastic damage
underground structure
soil-structure interaction
