高强钢角焊缝的强度模型和设计建议  

Strength model and design recommendations for high strength steel fillet welds

作　　者：姜顺航 冉明明 李国强[3] 孙飞飞[3] 陈江[1,2] 裴少帅 JIANG Shunhang;RAN Mingming;LI Guoqiang;SUN Feifei;CHEN Jiang;PEI Shaoshuai(College of Architecture and Environment,Sichuan University,Chengdu 610065,China;MOE Key Laboratory of Deep Underground Science and Engineering,Sichuan University,Chengdu 610065,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Baoye Group Corp,Ltd.,Shanghai 200941,China)

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]四川大学深地科学与工程教育部重点实验室,四川成都610065 [3]同济大学土木工程防灾国家实验室,上海200092 [4]上海宝冶集团有限公司,上海200941

出　　处：《建筑结构学报》2024年第6期224-234,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(52208186);四川省自然科学基金项目(2022NSFSC1016);中国博士后科学基金(2020M673224);成都市科技项目(2022YF0500395SN)。

摘　　要：目前针对高强钢角焊缝力学性能的研究多采用试验研究的方法,缺少系统的设计理论。采用传统的针对普通钢角焊缝连接的强度模型和失效准则,对高强钢角焊缝的断裂角度和破坏荷载进行预测,通过与试验结果的对比,选择精度较高的最大剪应力准则,并确定模型中的参数C取值。基于钢板间摩擦力的影响和焊根处应力集中产生的约束效应,推导出两个优化系数,对强度模型进行修正。为了便于工程应用,结合承载力计算推导过程,提出了角焊缝在不同加载角度下的简化公式,并对公式进行了验证。通过搜集和汇总焊缝尺寸、材料性能以及试件工作性能等三方面的数据,对简化公式进行可靠度分析,得出安全系数为4.5时的抗力分项系数为0.79。对我国规范中高强钢角焊缝连接的设计方法提出修正建议,即在承载力计算公式中应考虑约束效应、摩擦效应、焊材强度和加载角度等的影响。At present,research on the mechanical behavior of high strength steel fillet welds mostly adopts experimental methods,and lacks a complete set of design theories.For this purpose,traditional strength model and failure criteria for mild steel were used to predict fracture angle and load carrying capacity of high strength steel fllet welds.By comparing with the test results,the maximum shear stress criterion was selected,which had higher accuracy,and then the value of parameter C in the model was determined.Because of the influence of friction between steel plates and the constraint effect caused by stress concentration at the welding root,two parameters were derived to modify the strength model.In order to facilitate engineering application,combined with the calculation and derivation process of bearing capacity,a simplified formula for fllet welds under different loading angles was proposed,and the formula was verified.By collecting and summarizing data on weld size,material properties and specimen working performance,the reliability of the simplified formula was analyzed,and it was concluded that the resistance factor was 0.79 when the safety index was 4.5.Suggestions were made on the design method of high-strength steel fillet weld connections in Chinese specifications,that is,the effects of constraint effects,friction effects,welding material strength and loading angle should be taken into account in the calculation formula of bearing capacity.

关 键 词：高强钢 焊缝连接 角焊缝 强度模型 可靠度分析 设计建议 

分 类 号：TU391[建筑科学—结构工程] TU511.3