摘要
为研究地下十字形地铁换乘车站结构在SV波(垂直偏振横波)斜入射下的地震反应,利用Flac3D软件建立地层-车站有限差分模型进行斜入射数值模拟,通过Fish语言编制程序,实现SV波斜入射时三维模型人工边界等效节点力的自动施加。对比分析了地震动垂直入射和斜入射时的车站柱顶速度时程、板和柱顶底相对位移、不同断面变形、板和侧墙的弯矩、柱顶轴力等。分析结果表明:地震动作用下十字形地铁换乘车站交叉区域的变形小于非交叉区域;顶板、底板、侧墙的内力在交叉边界处突变;SV波斜入射时,十字形地铁换乘车站会同时发生水平剪切变形与竖向剪切变形;SV波斜入射时,交叉区域的柱顶轴力显著大于非交叉区域;顶板的弯矩随着入射角的增大而增大。
To study the seismic response of underground cross-type metro interchange station structure under SV wave oblique incidence,the strata-station finite difference model is established with Flac3D software,carrying out oblique incidence numerical simulation.By coding with Fish language,the automatic application of equivalent nodal forces at the artificial boundary of the 3D model during SV wave oblique incidence is implemented.Station column top velocity time-history,relative displacements of slab and column top bottom,deformation of different sections,bending moment of slab and sidewall,and column top axial force for vertical incidence and oblique incidence of ground motion are comparatively analyzed.Results show that the deformation in the intersection area of the cross-type metro interchange station under the effect of ground motion is smaller than that in the non-intersection area.The internal forces of the top slab,bottom slab and sidewalls change abruptly at the intersecting boundary,and the horizontal shear deformation and vertical shear deformation occur simultaneously in the station when the SV wave is obliquely incident.The axial force at the top of the column in the intersection area is significantly larger than that in the non-intersection area during SV wave oblique incidence.The bending moment of the top slab increases with the increase of the incidence angle.
作者
马宇恒
赵慧玲
MA Yuheng;ZHAO Huiling(School of Mechanics and Engineering Science,Shanghai University,200444,Shanghai,China)
出处
《城市轨道交通研究》
北大核心
2022年第8期222-228,共7页
Urban Mass Transit
基金
上海市自然科学基金项目(19ZR1418700)。
关键词
十字形地铁换乘车站
垂直偏振横波斜入射
动力响应
人工边界
cross-type metro interchange station
SV wave oblique incidence
dynamic response
artificial boundary
