摘要
基于钢板-钢管混合连接,提出了木混凝土组合梁的预制装配连接形式,采用短期推出试验和长期加载试验分别研究了钢板-钢管混合连接的短期与长期抗剪性能。通过推出试件的短期破坏性试验,研究钢板-钢管连接的破坏模式、极限承载力和滑移刚度等性能;通过长期加载试验,分析钢板-钢管连接的长期滑移和蠕变系数,长期加载中考虑了相当于连接件短期承载力的10%和20%两种荷载比的影响;对加载近470 d后的长期试件进行破坏性推出试验,分析长期加载对其极限承载力和滑移刚度的影响。结果表明:钢板-钢管连接的极限承载力超过130 kN,初始状态的滑移刚度为45.9 kN/mm;通过短期推出试验和长期加载后的推出试验对比发现,钢板-钢管连接件受到长期荷载作用后,极限承载力和滑移刚度无明显下降,呈现出较好的长期性能。
The prefabricated connection method for timber-concrete composite(TCC)beams is proposed based on the steel plate-steel tube hybrid connection.Short-term push-out tests and long-term loading tests are conducted respectively to investigate the shear performance of the steel-plate to steel-tube hybrid connection.The failure modes,ultimate bearing capacity,and the slip moduli are studied by push-out tests.The slip and creep coefficient of the steel plate-steel tube hybrid connection are obtained in long-term loading tests,in which two loading levels,the 10%and 20%of the short-term ultimate bearing capacity,are considered.The effect of long-term loading on ultimate bearing capacity and slip moduli is analyzed by destructive push-out tests,in which long-term specimens are loaded about 470 days.Results show that the ultimate bearing capacity of the steel plate-steel tube hybrid connection is over 130 kN,while the initial slip stiffness is 45.9 kN/mm.It is demonstrated that no obvious decline occurs to the ultimate bearing capacity and slip moduli under long-term loading,and the steel plate-steel tube hybrid connection has preferable long-term behaviors.
作者
史本凯
杨会峰
曹航
肖凯
SHI Benkai;YANG Huifeng;CAO Hang;XIAO Kai(College of Civil Engineering, Nanjing Tech University, Nanjing 211800, China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2021年第3期390-398,共9页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家自然科学基金(51578284、51878344)。
关键词
木-混凝土组合梁
混合连接
装配式连接
承载力
长期性能
timber-concrete composite system
hybrid connection
prefabricated connection
load-carrying capacity
long-term behaviour
