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提出并介绍带间隙拉索保护的屈曲约束支撑(GT-BRB)的构造和力学性能,详细推导了其各阶段的刚度特性。GT-BRB的刚度特性可视为普通BRB与带间隙拉索刚度特性的叠加,它在大变形时体现出显著的第三刚度特性,其卸载刚度特性与最大应变幅有关;在受压状态下体现出的第三刚度略小于受拉状态下的第三刚度。对一个安装有GT-BRB的两层结构建立模型并进行了有限元分析,结果表明GT-BRB有利于减小结构的薄弱层效应,可进一步提高框架抗倒塌能力。
The structure and mechanical properties of GT-BRB with clearance cable protection are presented and introduced. The stiffness characteristics of GT-BRB are deduced in detail. The stiffness of GT-BRB can be regarded as the superposition of ordinary BRB and the stiffness of the cable with gap. It shows a significant third stiffness characteristic in large deformation, and its unloading rigidity is related to the maximum strain amplitude. Under the condition of compression The third stiffness is slightly less than the third stiffness in tension. The model of a two-layer structure with GT-BRB is built and analyzed by finite element method. The results show that GT-BRB can reduce the weak layer effect of the structure and further improve the anti-collapse ability of the frame.