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为避免十字形截面屈曲约束支撑的内芯在焊接后对低周疲劳性能的不利影响,提出核心部件采用角钢拼接的无焊十字形截面.进行了3根屈曲约束支撑试件的拟静力滞回性能试验,其中无焊核心部件采用黏钢胶拼接4根等边热轧角钢的方法,避免焊接或直接铸造试件中不可控缺陷的产生.试验结果表明,该类支撑的滞回性能稳定,第1根角钢断裂前,试件的累积塑性变形能力远高于铸造十字形截面,比端部焊接加劲肋的一字形核心屈曲约束支撑也有所提高.在第1根角钢断裂后,剩余截面仍具有相当的耗能能力.3根试件的拉压不平衡系数均在1.1以下,满足AISC规定的1.3限值要求.
In order to avoid the unfavorable influence on the low cycle fatigue performance of the inner core supported by the cross-shaped buckling restraint, a non-welded cruciform cross-section with angle steel splicing was proposed. Three pseudo-static hysteresis buckling restrained specimens Back to performance test, in which the core components of non-welded stainless steel with splicing 4 equilateral hot-rolled angle method to avoid welding or direct casting test pieces of uncontrollable defects generated.The results show that the hysteresis stability of such support is stable , The cumulative plastic deformation capacity of the specimens before rupture of the first one is much higher than that of the cast cross and the support of the center buckling restraint of the in-line shape is higher than that of the end welded stiffeners. After the first one is broken, Still have a considerable energy-consuming ability.The tensile stress and unbalance coefficient of the three specimens are all below 1.1, meeting the AISC 1.3 limit requirements.