防屈曲支撑二次刚度在不同位移幅值下取值的探讨

在建筑工程的数值电算分析中防屈曲支撑的一次刚度、屈服承载力及二次刚度与一次刚度比值是主要的输入参数。一次刚度可根据防屈曲支撑钢芯各组成段的结构按刚度串联原理计算,而防屈曲支撑二次刚度在不同的拉压循环幅值下在极限承载力内呈现出随拉压幅值的增大而减小的趋势,且逐步趋于稳定值。文章对Q235材质的防屈曲支撑进行试验,并对二次刚度进行了归纳总结。

The Evaluation of Prevention Buckling Brace Secondary Rigidity in Different Displacement Amplitude

In the numerical value＇s computer analysis of constructions, the primary buckling restrained brace rigidity, yield capacity and the rigidity ratio of the secondary and primary are major input parameters. According to the structures of buckling restrained brace steel core＇s constituent segments, the primary rigidity could be calculated with rigidity tandem principle, while under the different tension and compression cycle amplitudes, the secondary buckling restrained brace rigidity emerges a decreasing trend with the increasing of tension and compression amplitude within the limits of carrying capacity, gradually tends to a stable value. In this paper, the Q235 material buckling restrained brace is tested, and the secondary rigidity is summarized.