电弧增材制造T形件连接节点力学性能研究  

Study on mechanical properties of wire and arc additive manufactured T-stub connections

作　　者：张博 叶俊[2,3] 刘念武[1] 林晓阳 王震 汤慧萍 ZHANG Bo;YE Jun;LIU Nianwu;LIN Xiaoyang;WANG Zhen;TANG Huiping(School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Center for Balance Architecture,Zhejiang University,Hangzhou 310058,China;School of Engineering,Hangzhou City University,Hangzhou 310015,China)

机构地区：[1]浙江理工大学建筑工程学院,杭州310018 [2]浙江大学建筑工程学院,杭州310058 [3]浙江大学平衡建筑研究中心,杭州310058 [4]浙大城市学院工程学院,杭州310015

出　　处：《中国有色金属学报》2024年第4期1190-1200,共11页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52208215,52078452);浙江省自然科学基金资助项目(LQ22E080008,LGG22E080005)。

摘　　要：电弧增材制造(WAAM)技术在结构工程领域有着广泛的应用前景,具有生产效率高、设备成本低、材料利用率高和环境可持续性等优点。为了探究WAAM碳钢T形件连接节点的力学性能,设计一系列共12组由WAAM碳钢T形件、高强钢(HSS)T形件和高强螺栓组成的连接节点试件,通过试验研究螺栓线位置与螺栓排列方式对试件初始刚度、破坏模式及极限承载力的影响。采用三维激光扫描技术测量WAAM碳钢T形件相关几何参数,采用数字图像相关技术(DIC)辅助测量了T形件连接节点在加载过程中的位移响应。结果表明:WAAM碳钢T形件具有较好的力学性能,当螺栓线与腹板翼缘连接处距离减小时,试件的初始刚度与极限承载力均呈上升趋势,而失效模式均为预期的翼缘破坏,且螺栓未发生断裂。通过对比试验结果和现有设计规程计算结果,对相关计算方法的适用性与准确性进行评估,发现现有设计方法高估了试件的初始刚度,对破坏模式的预测较为准确,但对极限承载力的预测偏保守。最后,对已有计算模型进行修正,修正后的计算模型对连接节点极限承载力的预测效果较好。The wire arc additive manufacturing(WAAM)technology has a wide range of application prospects in the field of structural engineering,such as high productivity,low equipment costs,high material utilization ratio and excellent environmental sustainability.In order to investigate the mechanical properties of the connection joint of WAAM carbon steel T-stubs,a series of 12 sets of connection joint specimens consisting of WAAM carbon steel T-stubs,high-strength steel(HSS)T-stubs and high-strength bolts were designed.The effects of bolt line position and bolt arrangement on the initial stiffness,failure mode and ultimate bearing capacity of the specimens were investigated by tests.Geometrical parameters of WAAM carbon steel T-stubs were measured by 3D laser scanning technology.Digital image correlation(DIC)technology was used to assist in measuring the displacement response of T-stub connection joints during the loading process.The test results show that WAAM carbon steel T-stubs have superior mechanical properties.As the distance between the bolt line and the web-flange junction decreases,the initial stiffness and ultimate load capacity of the specimens tend to increase,while the failure mode is all the expected flange damage,and the bolts do not fracture.In order to evaluate the applicability and accuracy of the relevant calculation methods by comparing the test results with the calculation results of existing design regulations,comparison results show that the existing design method overestimates the initial stiffness of the specimens,and predicts the damage modes more accurately,but the predictions of the ultimate load capacity are conservative.At last,the existing calculation model was modified,and the modified calculation model predicts the ultimate bearing capacity of the connection joints better.

关 键 词：电弧增材制造 T形件 连接节点 初始刚度 破坏模式 极限承载力 

分 类 号：TG47[金属学及工艺—焊接]