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通过一榀1∶4平面框架的单调静力荷载试验,对六层两跨现浇柱预制梁框架的破坏形态、破坏机制、位移延性等进行了较为系统的研究。研究表明:现浇柱预制梁框架实现了预期的混合破坏机制,试验过程中在梁端首先出现塑性铰,在二、三层梁端出现多个塑性铰后柱端出现塑性铰;试件受力全过程中节点核心区箍筋始终处于弹性阶段;框架整体位移延性为6.3;试验框架实现了预期的“强柱弱梁”、“强节点”等设计目标,这表明参照现行混凝土框架抗震设计方法进行现浇柱预制梁框架设计是可行的。基于MIDAS软件对考虑预制混凝土梁截面刚度折减以及考虑节点刚度折减的、预制混凝土框架内力计算方法进行了研究,并提出了有关建议。
The failure mode, failure mechanism and displacement ductility of the prefabricated beam of six double-span cast-in-situ columns are systematically studied by the monostatic static load test of a 1: 4 plane frame. The results show that the prefabricated beam framework of cast-in-place pillars can achieve the expected mixed failure mechanism. During the test, the plastic hinges firstly appear at the beam ends, and the plastic hinges appear at the second and third beam ends after the plastic hinges. In the whole process, the stirrups in the core of the joint are always in the elastic phase. The overall displacement ductility of the frame is 6.3. The experimental framework achieves the designed goals of “strong column and weak beam”, “strong node” and so on. Concrete frame seismic design method for cast-in-place precast beam frame design is feasible. Based on MIDAS software, the calculation method of prestressed concrete frame internal force considering the reduction of section stiffness of precast concrete beams and the reduction of node stiffness is considered. Some suggestions are put forward.