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采用玄武岩纤维包裹约束的装配式防屈曲支撑不仅震后易于拆解修复,而且外包纤维布解决了外包钢管耐腐蚀性差的问题。对4个该类防屈曲支撑进行了拟静力试验研究,分析结果表明:玄武岩纤维包裹约束的装配式防屈曲支撑具有良好的滞回性能,在循环加载过程中基本未出现刚度与承载力的退化现象,且延性与耗能能力良好。防屈曲支撑受压时内核单元发生多波屈曲,内核单元施加的侧向推力导致约束单元中起包裹约束作用的玄武岩纤维发生变形,由于内核单元与约束单元之间的间隙增加,从而进一步加剧内核单元的多波屈曲,在防屈曲支撑滞回曲线上表现为受压阶段曲线的“跳动”。试件的最终破坏发生在内核单元屈服段的中间部位或屈服段与非屈服段的连接处;玄武岩纤维布约束效果良好,通过包裹纤维布可以将装配式防屈曲支撑两部分约束单元进行很好的组装。
The use of basalt fiber wrapped restraint assembly buckling support is not only easy to disassemble and repair after the earthquake, and outsourcing fiber cloth to solve the problem of poor corrosion resistance of steel pipe outsourcing. The quasi-static tests on four such buckling-resistant supports are carried out. The analysis results show that the fabricated buckling-restrained bracelets with basalt fiber wrapped restraint have good hysteretic behavior and little stiffness and load-carrying capacity during cyclic loading Degradation, and good ductility and energy dissipation. When the buckling brace is subjected to compression, the core element undergoes multiple buckling and the lateral thrust applied by the core element causes deformation of the basalt fiber, which acts as the constraint of the wrap, in the restraining element. As the gap between the core element and the restraining element increases, the core The multi-wave buckling of the element appears as the “runout” of the curve of the compression stage in the buckling support hysteresis curve. The final failure of the specimen occurred in the middle of the yielding section of the core element or the junction of the yielding section and the non-yielding section. The basalt fiber cloth restraining effect was good. The wrapped restraining buckling support two-part restraining unit could be well made by wrapping the fiber cloth The assembly.