房贞政  陈  勇  郑则群
（福州大学结构工程研究所 350002）

[提要]  进行了两个无粘结预应力混凝土梁柱节点试件（一个中节点、一个边节点）低周反复水平荷载试验研究。通过对两个试件的荷载-位移滞回曲线的分析，研究了节点的变形能力、耗能能力、延性和刚度退化等抗震性能。基于两节点试件试验的结果，分析了低周反复荷载作用下框架节点的破坏机理。
[关键词]  无粘结预应力混凝土  梁柱节点  低周反复荷载试验  抗震性能  破坏机理  核心剪切变形

Two unbonded prestressed concrete beam-column joint assemblies( one for interior joint and one for exterior joint) are tested under reversed cyclic lateral load. Based on the analysis of the hysteretic force-displacement characteristics of these two assemblies, the seismic behavior of beam-column joint is explored in following aspects:  transform capacity, energy dissipating capacity, ductility and stiffness deterioration etc. Based on the development of cracks and strains of the reinforcement etc., the failure mechanism of the two joints under reversed cyclic load is analyzed.
Keywords: unbonded prestressed concrete; beam-column joint; reversed cyclic load; quasi-static test; seismic behavior; failure mechanism; shear deformation; core area