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通过4个预应力混凝土宽扁梁框架边节点在低周反复荷载作用下的抗震试验研究,对宽扁梁边节点在模拟地震作用下的破坏形态、特征荷载、滞回特性、骨架曲线、延性以及耗能能力等抗震性能进行分析研究。研究表明:试件初裂出现在靠近柱附近的梁,最终破坏区域发生在节点外核心区剪切破坏;荷载位移滞回曲线基本上呈梭形且相对饱满,试件位移延性系数介于3.7~5.13,具有较好的延性及耗能能力;穿过节点外核心区的预应力筋数量变化时,试件的延性及耗能能力变化不明显;试验中出现外核心区内的扁梁纵筋与混凝土黏结滑移破坏,混凝土剥落,而内核心区水平箍筋并未达到极限强度,建议在扁梁框架节点的设计应设置构造竖向垂直箍筋。总体上看,预应力混凝土宽扁梁框架边节点具有一定的抗震性能,可以通过合理的构造措施将其应用于抗震结构中。
Through the seismic tests of four prestressed concrete wide-beam flange joints under low cyclic loading, the failure modes, characteristic loads, hysteresis characteristics, skeleton curves, ductility of wide-beam edge joints under simulated earthquake are studied. As well as energy-saving seismic performance analysis. The results show that the specimen first crack occurs near the column near the beam, and the final failure area occurs in the outer core of the node shear failure; load displacement hysteresis curve is basically fusiform and relatively full, specimen displacement ductility coefficient between 3.7 ~ 5.13, which has better ductility and energy dissipation capacity. The ductility and energy dissipation capacity of the specimens did not change obviously when the number of prestressing tendons passing through the outer core area of the joints varied. In the experiment, Tendons and concrete bond slip damage, concrete spalling, and the core area of the horizontal stirrups did not reach the ultimate strength, it is proposed in the design of flat-beam frame structure should be set to construct vertical vertical stirrups. As a whole, the edge joints of the prestressed concrete wide-slab frame have a certain seismic performance, which can be applied to the seismic structure through reasonable structural measures.