闽投运营中心主体结构动力弹塑性分析

Dynamic Elastoplastic Analysis of the Mintou Operation Center

为保证结构逆作法的施工质量和地铁车站施工安全,闽投运营中心采用框架-支撑核心筒结构体系。该结构是指将框筒结构的钢筋混凝土核心筒替换成支撑框架筒的结构体系。为检验该结构体系的抗震性能,采用PERFORM-3D软件建立结构三维空间模型,输入7组地震波进行弹塑性时程分析,得到结构的变形、内力及能量情况。结果表明:支撑核心筒和外框架可组成有效的多道抗震防线。钢支撑和框架梁是结构的主要抗侧力构件和耗能构件。同时,框架-支撑核心筒结构表现出与框筒结构一致的内力、变形特征。结构的弹性和弹塑性层间位移角均满足框筒结构水平位移限值要求。可见,框架-支撑核心筒结构体系具有良好的抗震性能,可用于其他类似工程。

To ensure structural construction quality of the top-down method and construction safety of subway station, the frame-bracing core tube,which is the structural system that replaces core-tube of frame-core wall structure with brace frame-cube,is adopted in Mintou Operation Center. A 3-D finite element model is established by employing the FEM package PERFORM-3D. Seven earthquake waves are inducted to the FEM model. Elastic and elasto-plastic analysis conducted to get the structural displacements,member forces and energy. The results show that: The bracing core tube and frame could form effective multiple seismic fortification lines. Braces and frame beams are the main force resistance members and energy dissipation members. Meanwhile, the frame-bracing core tube structure and the frame-corewall structure are the same in internal force and deformation. The maximum story drift ratio could conform to the relevant code requirement. The frame-bracing core tube structure has an excellent seismic performance and is able to apply to other similar projects.