论文部分内容阅读
近来,铝合金已用于制造防屈曲支撑(BRBs),以改善BRB在腐蚀环境下的耐久性。在以往的研究中,由于挤压成型铝合金的松弛,建议避免对挤压成型的铝合金BRB进行焊接。试验对10个带或不带闭锁装置的几乎完全相同的试样的低周疲劳性能进行了研究。结果表明,挤压成型的BRB具有稳定、反复的滞回性能,支撑屈服部位的断裂位置是随机的。与典型钢BRB的破坏相比,挤压成型的BRB的破坏是脆性破坏。对带和不带闭锁装置的试样进行对比,结果显示,当BRB水平放置且应变幅低于2%时,闭锁装置对累积非弹性变形没有明显的影响。给出了挤压成型BRB的低周疲劳损伤评估公式,可供基于应变的损伤评估参考。
Recently, aluminum alloys have been used to make buckling brace (BRBs) to improve BRB durability in corrosive environments. In previous studies, it was advised to avoid the welding of the extruded aluminum alloy BRB due to the slackening of the extruded aluminum alloy. The test investigated the low cycle fatigue performance of 10 almost identical specimens, with or without locking devices. The results show that the extruded BRB has a stable and repeated hysteretic behavior, and the rupture position of the support yield point is random. Compared with the destruction of the typical steel BRB, the destruction of the extruded BRB is brittle failure. Comparisons of specimens with and without locking devices showed that the locking device had no significant effect on the cumulative inelastic deformation when the BRB was placed horizontally and the strain amplitude was less than 2%. The evaluation formula of low cycle fatigue damage of extruded BRB is given, which can be used as reference for damage assessment based on strain.