铝管约束轻型防屈曲支撑的实验研究

针对传统的混凝土灌浆型和全钢型防屈曲支撑质量较大,无法适用于大跨空间结构等轻型建筑的问题,本文提出一种铝管约束轻型防屈曲支撑的设计方法。在核心钢管和约束管间设置不同宽度的间隙并对部分核心钢管进行开孔,通过拉压往复试验,研究了间隙和开孔对试件性能的影响,得到构件的相关恢复力特征,并分析了试件相关参数对耗能特性的影响。结果表明,本文设计的轻型防屈曲约束支撑,滞回曲线饱满,耗能效果良好;核心钢管宜开孔且支撑间隙应设置在1 mm左右,以减轻试件端部压力并简化施工工艺。

Experimental study on lightweight buckling-restrained braces( BRB) with aluminum tubes

In view of the problem that traditional concrete grouting and all-steel buckling-restrained braces(BRB)are too heavy to Ire suitable for lighter buildings such as large-span space structures,this paper presents a design method of lightweight buckling-restrained braces(BRB)restrained by aluminum tubes.Different width gaps were set between the core steel tube and the restraining tube,and some core steel tubes were perforated.Through the tensile and compression tests,the effects of gaps and perforations on the performance of the test piece were studied,The restoring force characteristics of components were obtained,and the parameters'influence on energy dissipation characteristics of the specimen was analyzed.The results show that the lightweight BRBs designed in this paper have full hysteretic curve and good energy dissipation effect;the core steel tube should be perforated and the bracing gap should be set at about 1 mm to reduce the end pressure of the specimen and simplify the construction process.