钢筋混凝土深梁填充钢框架的恢复力模型

Restoring force model of steel frames infilled with the reinforced concrete deep beam

为了提高钢结构初始刚度和抗震性能,实现结构刚度可在一定范围内渐变,可把深梁作为一种新型抗侧力结构形式。本文介绍这种新型的高层抗震加固结构体系—钢筋混凝土深梁。通过水平低周反复荷载模型试验,得到内填钢筋混凝土深梁钢框架结构的滞回曲线。试验结果显示:试件的滞回曲线饱满且骨架曲线有明显的塑性流动阶段和荷载下降阶段,证明内填混凝土深梁钢框架结构抗震性能良好;试验过程中,首先钢筋混凝土深梁破坏退出工作,随后钢框架发生破坏。因此,钢筋混凝土深梁可作为结构抗震设防的第一道防线,钢框架作为结构的第二道防线。同时,利用得到的试验数据进行回归分析,建立该结构恢复力模型,可用于填充钢筋混凝土深梁结构的弹塑性反应分析。

To enhance the initial stiffness and seismic performance of steel structures and realize the modulation of structural stiffness in a certain range,Reinforced Concrete Deep Beam,as a new strengthening system of high-rise structures,is introduced.The hysteresis loops of steel frames infilled with the reinforced concrete deep beam are obtained by cyclic loading model tests.The hysteresis loops are replete and the skeleton curves exhibit apparent plastic flow.The better ductility and energy dissipation capacity of the test models is proved.During the test,the deep beam first and the steel frame second was destroyed.The replete hysteresis loops proved that deep beam could be employed as the first defense of earthquakes and the steel frame as the second.Making use of test data,a restoring force model is established,which could be applied to the elastic-plastic analysis of the structure.