角部连接钢框架-玻璃纤维增强无机板组合墙体抗震性能试验研究

为研究角部连接钢框架 玻璃纤维增强无机板组合墙体的抗震性能，考察人字形斜撑和玻璃纤维增强无机板对钢框架 组合墙体的影响，设计2榀足尺的双层双跨钢框架和2榀足尺的双层双跨组合墙体进行拟静力试验。观察不同形式钢框架和组合墙体在低周往复荷载下的破坏过程及破坏形态，得到了各试件的滞回曲线、骨架曲线、刚度退化曲线、累积耗能、关键部位应变、延性系数等性能指标，对比分析人字形斜撑和玻璃纤维增强无机板对钢框架 组合墙体耗能性能、延性、承载力的影响。试验结果表明：组合墙体抗侧承载力高，刚度大，而变形能力与耗能能力较差；人字形斜撑能有效提高钢框架承载力、延性及耗能能力，但在组合墙体中人字形斜撑作用不明显，且圆钢管人字形斜撑易发生平面外失稳，建议设计时采用平面外刚度大于平面内刚度的H型钢；玻璃纤维增强无机板可以较大程度提高钢框架的抗侧承载力，由于玻璃纤维增强无机板过早开裂破坏，导致其延性降低，刚度退化速度加快，耗能能力变弱。基于已有的侧移刚度公式，对其进行参数修正并给出组合墙体侧移刚度简化计算式，理论值与试验初始抗侧刚度吻合较好，可为后续研究提供理论基础。

Experimental study on seismic behavior of composite wall composed of steel frame and glass fiber reinforced inorganic boards with corner connection

To investigate the seismic behavior of composite walls composed of steel frame and glass fiber reinforced inorganic boards with corner connections, and to study the influence of herringbone diagonal bracing and glass fiber reinforced inorganic boards on steel frame and composite wall, two full-scale steel frame specimens and two full-scale composite wall specimens, all with two stories and double-span, were designed and subjected to quasi-static tests. The failure modes of different steel frames and composite walls under low cyclic load were observed, and the performance indices including the hysteretic curve, skeleton curve, stiffness degradation curve, cumulative energy dissipation, strain at key points and ductility factor, were obtained from the test. The influences of herringbone diagonal bracing and glass fiber reinforced inorganic concrete boards on the dissipation capacity, ductility and bearing capacity of the specimens were investigated. The test results show that the composite wall has large lateral bearing capacity, high rigidity, and poor deformation and energy dissipation capacity. The herringbone diagonal bracing can effectively improve the lateral bearing capacity, ductility and energy dissipation capacity of the steel frame, but the effect is not obvious for the composite wall. The herringbone diagonal bracing of round steel tube is prone to out-of-plane instability. It is suggested that H-shaped steel with out-of-plane stiffness greater than in-plane stiffness should be used instead of round steel tube in the design. The addition of glass fiber reinforced inorganic boards can greatly improve the lateral bearing capacity of the steel frame, however, due to the premature cracking and failure of glass fiber reinforced inorganic boards, the ductility of the specimen is reduced, the stiffness degradation is accelerated, and the energy dissipation capacity is weakened. Based on the existing formula in the literature, a simplified calculation formula for lateral stiffness of composite wall through parameter modification was proposed. The theoretical values obtained are in good agreement with the experimental results, which provides a theoretical basis for subsequent research.