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将偏心支撑与半刚接钢框架相结合,是一种新型的框架支撑体系。偏心支撑可以弥补半刚接钢框架的刚度不足,同时又不降低其延性和耗能能力。运用ANSYS有限元分析软件,建立了4榀6层的半刚接钢框架(1榀框架无偏心支撑,3榀框架有偏心支撑)有限元模型,对框架试件进行模态分析。研究节点初始刚度、支撑条件等因素对框架自振周期的影响。根据分析得出:偏心支撑半刚接钢框架的刚度主要由支撑提供,梁柱的半刚性连接对结构的自振周期无显著影响。在相同参数下,支撑类型对结构自振周期有影响。
The eccentric support and semi-rigid steel frame combination is a new type of frame support system. Eccentric support can compensate for the lack of stiffness of the semi-rigid steel frame, without compromising ductility and energy dissipation. The finite element model of semi-rigid steel frame with 4 榀 6 layers (1 榀 frame without eccentric support and 3 榀 frame with eccentric support) was established by ANSYS finite element analysis software, and the modal analysis of frame specimen was established. The influence of initial stiffness and supporting conditions on the natural period of the frame is studied. The analysis shows that the stiffness of the semi-rigid frame with eccentric support is mainly provided by the support, and the semi-rigid connection of the beam and column has no significant effect on the natural vibration period of the structure. Under the same parameters, the type of support has an effect on the natural period of the structure.