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对一种防屈曲钢支撑(BRB)进行试验研究和有限元分析。该防屈曲钢支撑有两类构件:1)一块承受轴向压力或拉力的钢芯板;2)两个相同的支撑构件,通过A490高强螺栓将其固定在钢芯板上,以防止钢芯板屈曲。在钢芯板与支撑构件之间存在空隙,以使钢芯板在压力下能自由变形。通过拆除螺栓就能方便地拆卸支撑构件,在地震中损坏的钢芯板可以方便地更换。因此,支撑构件不需要重新制作更换。对4个装配式防屈曲支撑进行试验,以观测其塑性变形能力及支撑构件的稳定性。结果显示,有足够抗弯刚度支撑的3个钢芯板为:1)滞后响应稳定后钢芯板轴应变增加2.1%～2.6%;2)最大的压力值为1724～1951kN(是实际屈服荷载的1.4倍～1.6倍);3)有一个试件的累积塑性变形比AISC(2005)规范中的抗震要求大很多。另一块钢芯板由于支撑结构的抗弯刚度不足,用以观测它的整体屈曲情况。对每一块钢芯板都进行了非线性有限元分析。参数分析的目的是为将来研究支撑构件尺寸、螺栓的数量、钢芯板的长度和截面面积对屈曲荷载的影响提供数据。钢芯板的设计程序是以试验结果和有限元分析为依据的。
An experimental study and finite element analysis of a buckling resistant steel brace (BRB). The anti-buckling steel support has two types of components: 1) a steel core plate subjected to axial compression or tension; 2) two identical support members secured to the steel core plate by A490 high strength bolts to prevent the steel core Plate buckling. There is a gap between the steel core plate and the support member so that the steel core plate is free to deform under pressure. The support members can be easily removed by removing the bolts, and the damaged steel core plate can be easily replaced during the earthquake. Therefore, the support member does not need to be reworked. Four fabricated anti-buckling braces were tested to observe their plastic deformation capacity and the stability of the supporting members. The results show that the three steel core plates with sufficient bending stiffness support are: 1) the strain of the steel core plate increases by 2.1% -2.6% after the hysteresis is stabilized; 2) the maximum pressure value is 1724 ~ 1951kN (is the actual yield load 1.4 times to 1.6 times); 3) The cumulative plastic deformation of a specimen is much larger than the seismic resistance requirement of AISC (2005). The other steel core plate was used to observe its overall buckling due to insufficient flexural rigidity of the support structure. Nonlinear finite element analysis of each steel core plate was carried out. The purpose of the parametric analysis is to provide data for future studies on the effect of buckling load on the size of the support members, the number of bolts, the length of the core plate and the cross-sectional area. The design procedure of steel core is based on the test results and finite element analysis.