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为研究采用国标Q235热轧角钢设计制作的屈曲约束支撑试件的滞回性能,检验双角钢工作协同性对支撑性能的影响,设计并制作了两种截面、两种组合方式的4个屈曲约束支撑试件。通过低周循环加载静力试验,研究了包括力-位移滞回曲线、刚度变化、恢复力模型、延性、耗能性能等在内的滞回性能。研究表明,双角钢屈曲约束支撑性能稳定,延性较高,具有良好的耗能性能和抗低周疲劳性能;内核构件拉压极限荷载的差值随着控制位移的增加而略有增大,双角钢屈曲约束支撑的恢复力模型可以采用双线性模型进行描述;双角钢钢芯工作段焊接与否不影响两角钢的协同工作能力,也不影响支撑的强化刚度、延性、耗能性能等指标,该类型支撑钢芯的工作协同性仅仅与钢芯和外套管的相对刚度有关;端部加强的做法使支撑制作工艺简化、费用降低,便于批量生产。
In order to study the hysteretic behavior of the buckling restrained brace designed and manufactured with the national standard Q235 hot-rolled angle steel and the influence of the work synergy of the double angle steel on the brace performance, two kinds of buckling restraints Support specimen. Through the low-cycle cyclic loading test, the hysteretic behavior including the force-displacement hysteresis curve, the stiffness variation, the restoring force model, ductility and energy dissipation performance are studied. The results show that the buckling restrained double-angle steel has the characteristics of stable buckling restraint, high ductility, good energy dissipation performance and low cycle fatigue resistance. The difference between ultimate load and tensile load of core members increases slightly with the increase of control displacement. The bilinear model can be used to describe the restoring force model of the buckling-restrained support of angle steel. The welding of the work-piece of the double-angle steel core does not affect the coordination ability of the two angles, nor does it affect the indexes of strengthening stiffness, ductility and energy dissipation , This type of support steel core work synergies only with the relative stiffness of the steel core and the outer casing; strengthen the end of the support to make the production process is simplified, the cost is reduced for easy mass production.