建筑结构学报2018，Vol.39Issue(5)：156-163,8.DOI:10.14006/j.jzjgxb.2018.05.020
预拉力螺栓连接焊接T形件受力性能研究
Research on mechanical property of welded T-stub connections with high-strength bolts with pretension force
摘要
Abstract
In order to analyze the effect of the main parameters on mechanical property of welded T-stub connections, tensile tests on 10 welded T-stub connections were conducted. The formulas from EN 1993-1-8 (EC3) code were used to predict the initial stiffness and plastic resistance of welded T-stub connections,and the impact of pretension force of high strength bolts on the initial stiffness of T-stub connections was also discussed. The results show that with the increase of bolt diameter,when bearing capacity of T-stub is controlled by the bolt strength,the plastic resistance increases significantly. Improving the strength grade of bolts can increase the initial stiffness of the specimens with the maximum increase up to about 47.8％,but the impact on plastic resistance can be ignored. The impact of bolt distance from web on both initial stiffness and plastic resistance of T-stub is larger. When edge distance of bolts is larger than 1.5 times of the bolt distance from web,the impact on mechanical property can be ignored. The EC3 code formulas underestimate the plastic resistance of specimens,ignoring the contribution of bolt pretension force to the initial stiffness. A rather large error can be introduced when the constraint of flange plate is close to simple support or fixed support. In case of fixed support,the predicted value of Faella formulas is in good agreement with the experimental result. For simple support further improvement is needed. The research results can be reference for the design of the beam-column bolt connections of steel structure.关键词
焊接T形件连接/预拉力螺栓/静力试验/理论分析/塑性承载力/初始刚度Key words
welded T-stub connection/pretension bolts/static test/theoretical analysis/plastic resistance/initial stiffness分类
建筑与水利引用本文复制引用
郭宏超,梁刚,刘云贺,皇垚华..预拉力螺栓连接焊接T形件受力性能研究[J].建筑结构学报,2018,39(5):156-163,8.基金项目
国家自然科学基金项目(51308454),中国博士后科学基金项目(2013M542371),西安市城乡建设科技项目(SJW2014023). （51308454）
