摘要
基于ABAQUS软件的96CPU显式有限元并行计算集群平台,建立地基土—变截面地铁地下车站结构体系三维非线性地震反应分析有限元模型,数值模拟Kobe地震记录、Mex地震记录和100年超越概率3%的南京人工地震波作用下,软弱地基上变截面地铁地下车站结构地震反应特性。结果表明:地下结构上部土层地表处峰值加速度小于不含地下结构土层表面峰值加速度;地震动作用下模型地基呈现出显著的低频聚集(放大)、高频滤波效应;地震动在穿越地下结构时,出现散射等复杂传播行为。变截面地下结构(上宽下窄型)的下层结构地震响应大于上层结构,下层结构中柱的应力峰值大于楼板和侧墙的应力峰值,侧墙的应力峰值大于楼板的应力峰值。上层结构中柱的应力峰值最大,变截面处侧墙应力峰值次之,楼板应力峰值最小。输入地震动的峰值加速度和频谱特性对地下车站结构的地震反应均有很大影响;地下车站结构的地震反应具有明显的空间效应。
Based on the explicit finite method of ABAQUS software and the 96CPU parallel computingcluster platform, the 3-D numerical simulation on soft soil-variable cross-section subwaystation structure is performed to research the different nonlinear seismic response of the modelrespectively under Kobe and Mex ground motions as well as Nanjing artificial wave which takesthe probability of exceedance as 3% within 100 years. The results show that the peak accelerationof soil in which upper the subway station is less than other place on the ground surface, thephenomena of high frequency filtering and low frequency amplification effect of the soft soil wereobserved underground motions. When earthquake pass through the underground structure, complexpropagation behavior, such as scattering and diffraction occurred. Variable cross-section subwaystation structure, which has a narrow base shows more serious seismic response on the sub-layerof structure than that in up-layer of structure. In the sub-layer, the interior column was the weakestmember, the peak stress of the interior column was greater than that in side wall and crest slab.In the up-layer, the same phenomenon can be obtained. In addition, the peak acceleration and thespectrum characteristic of input ground motion have great influence on the earthquake response ofthe underground structure, the seismic response of underground structure showed obvious spatialeffect.
出处
《地震地磁观测与研究》
2016年第5期41-48,共8页
Seismological and Geomagnetic Observation and Research
基金
中央级公益性科研院所基本科研业务费专项(DQJB14B05)
国家自然科学基金(51508526)
关键词
数值模拟
变截面地铁地下车站结构
地震反应特性
空间效应
numerical simulation,variable cross-section subway station structure,seismicresponse behavior,spatial effect
