斜向水平荷载作用下双向不等肢配箍框架柱受剪性能试验研究

EXPERIMENTAL RESEARCH ON SHEAR PERFORMANCE OF RC FRAME COLUMNS WITH DIFFERENT AMOUNT OF STIRRUPS IN TWO PRINCIPAL DIRECTIONS UNDER SKEWED HORIZONTAL CYCLIC LOADS

通过三根不等肢配箍矩形框架柱在斜向低周水平反复荷载作用下的模型试验,结合以往试验数据,从滞回性能、刚度退化、延展性、耗能能力等方面对不等肢配箍矩形框架柱的抗震性能进行分析。分析表明:剪切破坏不等肢配箍矩形框架柱较差;刚度在加荷初期退化不明显,随着斜裂缝出现和位移的增加,刚度退化程度加大;延性系数和极限转角均随加载角度的增大而增大。在0o加载角时,构件的耗能能力最强,当加载角度为15o和75o时构件的耗能能力相差不大。

Three RC frame columns are tested under two-way horizontal cyclic loads. Based on the testing results, as well as those of previous experiments, the seismic behaviors of RC frame columns with different amount of stirrups are researched in this paper. The hysteretic behavior, rigidity degeneration, ductibility and capability of energy dissipation are analyzed by loading the structures in two principal directions. Experimental results show that the hysteretic behavior is poor and the rigidity degeneration is not significant during the early loading stage but turns out to be significant after cracks occur. Results also indicate that the ductility factor and the ultimate rotation angle of the columns increase with the increasing of load angle. Moreover, the capability of energy dissipation is maximized in the case of 0° load angle, and the variation is small if the load angle varies between 15° and 75°.