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外包约束构件的刚度和强度是保证防屈曲支撑(BRB)具有稳定承载力和足够延性的关键,设计时不仅要考虑整体失稳,也要考虑局部失稳。对于全钢防屈曲支撑,由于其缺乏混凝土的约束作用更容易发生局部屈曲。该文对全钢防屈曲支撑的局部稳定性进行研究。首先从理论上推导出内芯对外套管的挤压力表达式,继而针对一字形内芯全钢防屈曲支撑推导出其外套管承载力的表达式,最后将整体稳定性分析中的约束比概念拓展到局部稳定性中,得到保证全钢防屈曲支撑局部稳定的约束比表达式及其下限值。结果表明:此约束比与支撑厚度比、间厚比、内芯宽厚比、轴向应变等因素有关,在设计中应综合考虑。
The rigidity and strength of outsourced restraint members are the key to ensure the buckling resistance (BRB) with stable bearing capacity and enough ductility. The design not only considers the overall instability, but also considers the local instability. For all steel buckling support, local buckling is more prone to occur due to its lack of restraint of concrete. In this paper, the local stability of the buckling brace of the whole steel is studied. First of all, the squeezing force expression of the inner sleeve to the outer sleeve is deduced theoretically, and then the expression of outer sleeve bearing capacity is deduced according to the anti-buckling brace of in-line core. Finally, the constraint ratio The concept is extended to the local stability and the constrained ratio expression and the lower bound of the local stability of the whole steel buckling brace are obtained. The results show that the restraint ratio is related to the ratio of support thickness, thickness ratio, core to width ratio, axial strain and other factors, which should be considered in the design.