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为了给大跨地下结构地面上新建建筑的抗震设计提供依据,以某大跨地下拱壳结构工程为对象,采用通用有限元软件ANSYS,建立大跨地下拱壳结构-上覆土体的数值计算模型,依据结构抗震设防目标及场地条件,输入三向地震波进行地震反应分析。在结构覆土地面沿纵向和横向分别选取代表性节点,提取沿纵向线及沿横向线分布各点的地震反应,分析地面点的位移与应力响应,并结合建筑结构动力特性进行分析。研究结果表明:所建立的地下结构-上覆土体的地震反应分析模型能够反映出结构上覆土地面的动力反应特性;在靠近大跨地下拱壳结构的地面投影中心附近,竖向动力响应较为显著,不宜增建对竖向位移响应较敏感的结构;在综合利用大跨地下拱壳结构上部地面空间时,对地面增建建筑进行抗震设计时,分析结果可为增建建筑抗震分析的地震输入与分析提供理论指导,并为增建建筑位置的选取及结构选型提供依据。
In order to provide the basis for the seismic design of the new building on the ground of large span underground structures, the finite element software ANSYS is used to design a long-span underground arch structure. The numerical model of the overlying arch structure with overlying ground is established , According to the seismic fortification objectives and site conditions, the input three-dimensional seismic response analysis. The representative nodes are selected longitudinally and transversely respectively on the structural overburden ground, and the seismic response along the longitudinal and transverse lines is extracted. The displacement and stress response of ground points are analyzed, and the dynamic characteristics of the building are analyzed. The results show that the established seismic response analysis model of the overburden soil can reflect the dynamic response characteristics of the overburden ground. Near the ground projection center near the long-span underground arch structure, the vertical dynamic response is significant It is not advisable to build a structure that is sensitive to vertical displacement. When seismic design of ground-based building is taken comprehensive utilization of the upper ground space of long-span underground arch structure, the result of the analysis may be seismic input of building anti-seismic analysis Provide the theoretical guidance with the analysis, and provide the basis for selecting the construction location and selecting the structure.