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.
A Modified Calculation Method for Bearing Capacity of CHS-to-RHS T-Joints Based on Equivalent Brace Section
In order to study the bearing capacity relations between circular hollow section(CHS)-to-rectan-gular hollow section(RHS)T-joints and corresponding RHS joints,the refined finite element analysis mod-els 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 width β,the ratio of chord width to its wall thickness γ,the thickness ratio of brace to chord τ,the ratio of chord section height to width ξ,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 fac-tors on the bearing capacity ratio of the two types of joints were obtained.The results showed that the di-mensionless 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 calcu-late the bearing capacity of CHS-to-RHS T-joints based on the formula in Standard for Design of Steel Struc-ture(GB 50017-2017),and its rationality was verified by experimental data.
CHS-to-RHS T-jointRHS jointcross-section equivalentbearing capacity of jointscorrec-tion factor
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