摘要
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。
In order to improve the seismic performance of glued-laminated timber frames,the low-cycle loading tests of four timber buckling-restrained braces(TBRB)are carried out.The mechanical properties,failure modes,hysteresis curves,ductility,and energy dissipation capacity of timber buckling-restrained braces are analyzed.The test results showed that the failure modes of the specimens include the tensile failure of steel core,local buckling of steel core and local compression failure of timber,multi-wave buckling of steel core and crack of timber.The hysteretic curve of each specimen has a typical fusiform shape,which means TBRB have good energy dissipation capacity and large initial stiffness.The ductility and energy dissipation capacity of TBRB strengthened with steel plates and end-reinforced hoop are significantly improved,compared to the TBRB without being strengthened.The test results show that TBRB strengthened with steel core plates and end-reinforced hoop can achieve better seismic performance,which reveals the application prospect in seismic design of glued-laminated timber frames.
作者
陆伟东
蔡玉鹏
刘鹏越
张峰
LU Weidong;CAI Yupeng;LIU Pengyue;ZHANG Feng(College of Civil Engineering,Nanjing Tech University Nanjing,211816,China;Architectural Design and Research Institute,Nanjing Tech University Nanjing,210009,China)
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2023年第2期384-389,415,共7页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(51378255)。
关键词
胶合木框架
木壳屈曲约束支撑
内衬钢板
抗震性能
低周反复试验
glued-laminated timber frames
timber buckling-restrained braces(TBRB)
steel plates
seismic performance
low-cycle loading tests
