周期反复荷载作用下高轴压比框架柱抗震性能的试验研究

Experimental study on seismic behavior of frame columns with high axial load ratio subjected to low cyclic loads

本文是关于框架柱在低周反复荷载作用下抗震性能的试验研究。根据16个“⊥”形试件在固定轴向荷载和水平周期反复荷载作用下的试验结果,首先讨论了影响框架柱开裂荷载的因素,接着深入分析了混凝土强度等级、轴压比、长细比、纵筋配筋率、箍筋形式及配箍特征值等因素对框架柱的延性和位移转角的影响。最后,根据本次试验结果,分析和讨论了框架柱轴压比超限问题和轴压比超限时配箍特征值的取值问题。

This paper is about experimental study on seismic behavior of frame columns beyond limit values of axial load ratio subjected to low cyclic loads. Based on the testing results of 16 “┸” shape columns under constant axial loading and horizontal low cyclic loading, factors affecting the cracking loads of framed columns are discussed firstly, and then the factors of concrete strength grade , axial load ratio, slenderness ratio, longitudinal reinforcing bars ratio, type of stirrups, reinforcing steel indexes and so on are analyzed, which affects ductility and angular displacement of frame columns. The questions about load limits exceeding and the choice of reinforcing steel indexes of columns are analyzed and discussed finally based on these testing results.