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预应力混凝土框架结构在地震作用下的反应与普通钢筋混凝土结构相比存在着差异,且受力复杂,难以通过理论分析得到其抗震性能.结合实际工程,通过框架节点试验模型在低周反复加载作用下的拟静力试验,研究了后张有粘结预应力混凝土框架边节点的破坏形态、滞回特性、骨架曲线、刚度退化、破坏时应变等.研究结果表明:水平地震作用下有粘结预应力混凝土框架边节点模型的位移滞回曲线由梭形变化到反S形,存在捏拢现象;位移延性系数能达到4.0以上,耗能能力较强,结构具有较好的抗震性能;建议通过加大柱截面和增强柱端抗剪钢筋来实现强剪弱弯.
The response of the prestressed concrete frame structure under earthquake is different from that of the common reinforced concrete structure, and it is difficult to obtain the seismic performance through theoretical analysis because of the complicated stress. Combined with practical engineering, through the frame node test model, Under the action of pseudo-static test, the damage morphology, the hysteresis characteristics, the skeleton curve, the stiffness degradation and the strain at failure of the post-tensioned bonded prestressed concrete frame are studied. The results show that: The displacement hysteresis curve of the edge node model of prestressed concrete frame changes from spindle shape to inverse S shape, and the pinch phenomenon exists; the displacement ductility coefficient can reach above 4.0, and the energy dissipation capacity is strong, and the structure has good anti-seismic performance. Strong shear weakening is achieved by increasing the column cross section and reinforcing the column end shear reinforcement.