木壳屈曲约束支撑低周反复加载试验研究

陆伟东, 蔡玉鹏, 刘鹏越, 张峰

Journal of Vibration,Measurement & Diagnosis(2023)

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Abstract
为了提高胶合木框架结构的抗震性能,对4根不同构造形式的木壳屈曲约束支撑(timber buckling-restrained braces,简称TBRB)进行低周反复荷载试验,分析了木壳屈曲约束支撑的破坏形式、滞回曲线、骨架曲线、刚度退化曲线及延性等抗震性能.试验结果表明:试件的破坏形态主要为钢内芯拉断、钢内芯局部屈曲和木材局压破坏、胶合木开裂和钢内芯多波屈曲;所有试件的滞回曲线基本上呈梭形,耗能良好,初始刚度较大,低周反复荷载下支撑刚度退化明显;经内衬钢板和端部加强的木壳屈曲约束支撑的耗能能力、延性、极限承载力均优于其余3种构造,但对初始刚度影响不大.研究结果表明,内衬钢板和端部加箍的木壳屈曲约束支撑可实现更好的抗震性能,具有良好的实践性,可为胶合木框架结构抗震设计提供参考.
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Key words
glued-laminated timber frames,timber buckling-restrained braces(TBRB),steel plates,seismic performance,low-cycle loading tests
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