反复荷载作用下双向受剪框架柱的刚度退化

Rigidity Degeneration of RC Column Under Two-Way Horizontal Cyclic Loads

双向受剪框架柱在反复荷载作用下的刚度退化是结构抗震分析中的重要内容．该文通过对不等肢配箍框架柱在低周施加反复荷载作用试验,提出了在加载初期刚度退化不明显,斜裂缝出现以后,刚度退化程度加大的特征,并指出反复荷载作用下框架柱的剪切破坏属于脆性破坏．结果表明,双向受剪柱的刚度退化与单向受剪柱比较无明显差别．

Rigidity degeneration of RC column is important in the analysis of anti-earthquake for the whole structure. Based on the experiment of columns under low-frequency cyclic loads, this paper discovers that rigidity degeneration is not obvious during the early loading stage but increases after the crack appears. Also the result indicates that the shear failure under two-way cyclic loads is brittle failure. It is shown that there is no obvious difference between the rigidity degeneration of column under two-way shear and that under one-way shear.