核心区和柱混凝土强度不等时节点的性能研究

通过 4个框架节点在低周反复荷载下的试验 ,研究了柱混凝土强度比梁高时核心区和柱混凝土强度不等节点(简称夹心节点 )的受力特性及简单易行的加固措施 ,结果表明 ,夹心节点的开裂荷载、抗剪承载力、刚度、延性、抗震性能等比普通节点差 ,在核心区增加X型钢筋是加强夹心节点的有效方法 .并对通用的节点开裂荷载计算公式进行了考虑核心区箍筋影响的修正 ,在参考规范承载力公式基础上提出与 fc 和 fbv有关的节点极限承载力计算公式 .

Research on Frame's Joint That Concrete Strength of Core Is Inferior to That of Column

The tests of four specimens of frame's joint aiming at studying the frame's joint whose core concrete strength is inferior to that of columns' under low frequency reversed load were conducted.The joint with core concrete lower to column is inferior in crack strength,maximum strength,stiffness, deformation and the seismic capacity to common joint. The joint of core concrete inferior to columns' is strengthened with X steel,which is proved to be a good method. The crack shearing strength formula was revised by considering the stirrups in joint core,and the maximum shearing strength formula concerning f c and f bv was put forward in consideration of the standard shearing strength formula.