基于支管截面等效的T形主矩支圆管节点承载力修正计算方法  

A Modified Calculation Method for Bearing Capacity of CHS-to-RHS T-Joints Based on Equivalent Brace Section

作　　者：袁智深 许硕[1] 姚尧 甘澍琛 YUAN Zhishen;XU Shuo;YAO Yao;GAN Shuchen(College of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China;Hunan Key Laboratory of Engineering Rheology,Central South University of Forestry and Technology,Changsha 410004,China;College of Urban Construction,Zhejiang Shuren University,Hangzhou 310015,China)

机构地区：[1]中南林业科技大学土木工程学院,长沙410004 [2]中南林业科技大学,工程流变学湖南省重点实验室,长沙410004 [3]浙江树人学院城建学院,杭州310015

出　　处：《工业建筑》2024年第12期138-148,共11页Industrial Construction

基　　金：湖南省自然科学基金项目(2023JJ31013);湖南省研究生科研创新项目(CX20230740);长沙市自然科学基金项目(kq2208422);浙江树人学院引进人才科研启动项目(2022R052)。

摘　　要：为研究T形主矩支圆管节点与对应矩形管节点承载力之间的关系,基于T形主方支圆管节点承载力试验数据,建立了两类节点的精细化有限元分析模型并开展了参数分析。分析时考虑了各种无量纲几何参数包括支管直径(或边长)与主管宽度比β、主管宽度与壁厚比γ、支管与主管壁厚比τ和主管截面高度与宽度比ξ、支管轴力性质以及主管轴力等因素对节点破坏模式、应力分布和承载力的影响,得到了各种因素对两类节点承载力比值的影响规律。结果表明:节点无量纲几何参数和支管轴力性质等因素对节点承载力影响较大,T形主矩支圆管节点与对应矩形管节点的承载力之间,并非简单的基于支管截面等效的圆支管直径与方支管边长之比(即π/4)的关系。综合考虑多种因素对T形主矩支圆管节点与对应矩形管节点承载力比值的影响,在GB 50017—2017《钢结构设计标准》承载力公式基础上提出了修正系数,用于计算T形主矩支圆管节点承载力,并通过试验数据验证了其合理性。In order to study the bearing capacity relations between circular hollow section(CHS)-to-rectangular hollow section(RHS)T-joints and corresponding RHS joints,the refined finite element analysis models of two kinds of joints were established based on the bearing capacity test data of CHS-to-SHS T-joints,and the parameter analysis of the two types of joints was carried out.The effects of various dimensionless geometric parameters,including the ratio of brace diameter(or side length)to chord widthβ,the ratio of chord width to its wall thicknessγ,the thickness ratio of brace to chordτ,the ratio of chord section height to widthξ,the properties of axial force in the brace,and axial force in the chord on the failure mode,stress distribution and bearing capacity of the joints were considered in the analysis,and the effects of various factors on the bearing capacity ratio of the two types of joints were obtained.The results showed that the dimensionless geometric parameters of the joints and the axial force properties of the brace had great influence on the bearing capacity of the joints,and the bearing capacity relations between the CHS-to-RHS T-joints and corresponding RHS joints were not a simple relations based on the ratio of the diameter of the circular brace to the side length of the square brace(i.e.π/4).Considering the influence of various factors on the bearing capacity ratio of CHS-to-RHS T-joints to RHS joints,a correction coefficient was proposed to calculate the bearing capacity of CHS-to-RHS T-joints based on the formula in Standard for Design of Steel Structure(GB 50017—2017),and its rationality was verified by experimental data.

关 键 词：T形主矩支圆管节点 矩形管节点 截面等效 节点承载力 修正系数 

分 类 号：TU392.3[建筑科学—结构工程]