建筑结构学报2017，Vol.38Issue(5)：20-26,7.DOI:10.14006/j.jzjgxb.2017.05.003
覆板加强的方钢管T形节点轴向滞回性能试验研究
Axial hysteretic behavior test of doubler plate reinforced square tubular T-joints
摘要
Abstract
In order to study the effect of doubler plate on the axial hysteretic behavior of reinforced square tubular joints,two groups of unreinforced and doubler plate reinforced (DPR) square tubular joints were tested under axial cyclic loading,where the ratios of brace to chord width are 0.4 and 0.8 respectively.The design scheme,experiment process as well as failure modes of the specimens were presented.Hysteretic performance of the specimens such as hysteretic loops,skeleton curves,energy dissipation and ductility were analyzed.Experimental results show that although the crack position of each specimen is different,the specimens mainly experience five stages under axial cyclic loading,namely the chord yielding,initial cracking,crack closure,crack expansion and crack penetration.The doubler plate can prevent the development of cracks into the chord wall,which can effectively avoid the tearing failure of the chord flange.Therefore,the compression capacity of the DPR joints cau continue to rise after cracking,and the tensile capacity of the DPR joints is higher than un-reinforced ones.The energy dissipation and ductility of the joints are increased with the decrease of the ratio of brace to chord width.The energy dissipation capacity of DPR joints is lower than the corresponding un-reinforced ones,and this kind of degeneration is more significant when the ratio of brace to chord width is lower.The tensile cracks reduce the ductility of the specimens,and the ductility of the specimens under axial tensile cycle is lower than the corresponding compression cycle.The ductility of the joint is improved by doubler plate when the ratio of brace to chord width is 0.8,while degenerated when the ratio of brace to chord width is 0.4.The unbalanced of the tension and compression capacity of the DRP joints under axial cyclic loading should be paid more attention to.关键词
冷弯薄壁型钢/方钢管/覆板加强节点/T形节点/轴向滞回/拟静力试验/抗震性能Key words
cold formed thin-walled steel/square tubular/doubler plate reinforced joint/T-joint/axial hysteresis/quasi-static test/seismic behavior分类
建筑与水利引用本文复制引用
常鸿飞,夏军武,罗梓,陆翊珉,周春波,祝华权..覆板加强的方钢管T形节点轴向滞回性能试验研究[J].建筑结构学报,2017,38(5):20-26,7.基金项目
国家自然科学基金项目(51408596),江苏省自然科学基金项目(BK20140195),江苏建筑节能与建造技术协同创新中心开放基金项目(SJXTY1510,SJXTY1609). （51408596）
