Development of analytical model for damage evaluation of prestressed reiforced concrete beam-column joints

研究表明，即使在预应力混凝土(PC)结构和预应力钢筋混凝土(PRC)结构中，当柱梁强度比等于或接近1时，节点也会发生破坏。增大梁柱强度比，节点的弯矩承载力较大。PC筋的位置和PC筋与混凝土之间的粘结对极限强度和破坏模式的影响不大。钢筋混凝土梁柱节点正截面承载力的理论和计算方法适用于PC和PRC梁柱节点。在该方法的应用中，预应力筋中的应力可视为截面上的轴力。计算结果与试验结果吻合较好，能较好地描述预应力比等设计参数的影响。

This resarch indicates that joint failure occuers when the column-to-beam strength ratio is equal or near one even in prestressed concrete (PC) structures and prestressed reinforced concrete (PRC) structures. Increasing column-to-beam strength ratio makes the moment capacity of the joint larger. The effects of Locations of PC bars and bond between PC bars and concrete on ultimate strength and failure mode are not large. The theory and calcuration method for moment capacity of reinforced concrete beam-column joints are applicable for PC and PRC beam-column joints. In the application of the method, the stresses in the PC bars can be treated as axial force in the sections. The calcurated restults agreed with the test results and the method was able to describe the effect of design parameters such as the prestressed ratio.