内设加劲肋空间DKT形相贯节点轴压承载力公式

BEARING CAPACITY FORMULAS OF MULTI-PLANAR DKT-JOINT CONTAINING INTERNAL STIFFENERS UNDER AXIAL COMPRESSION

以北京大兴国际机场航站楼钢结构工程为背景,在空间DKT形相贯足尺节点试验的基础上,为进一步研究节点的受力机理,对192组不同参数的节点有限元模型进行模拟分析。研究加劲肋开口尺寸、加劲肋厚度及其设置数量对空间DKT形相贯节点受力性能的影响。对设置不同加劲肋的空间DKT形相贯节点在承受轴压下的承载力设计值和极限承载力进行多元非线性回归,得到了内设加劲肋的DKT形节点承载力设计值和极限承载力的提高系数η。在现行的钢结构设计标准基础上得到内设加劲肋相贯节点承载力设计值和极限承载力计算公式。试验和有限元分析结果表明,内设加劲肋相贯节点的承载力设计值和极限承载力公式满足精度要求,可以为工程中类似节点的设计提供可靠参考。

For the construction of steel structures of Beijing Daxing International Airport Terminal,and based on the completed full-scale multi-planar DKT-joint tests,192 groups of finite element models with different parameters are simulated and analyzed to further study the mechanical mechanism of the DKT-joint.The influences of opening size,thickness and quantity of stiffeners on mechanical properties of the multi-planar DKTjoint are investigated.Multiple nonlinear regression towards the design and ultimate bearing capacity of the multiplanar DKT-joint containing various stiffener arrangements under axial compression is conducted,and the magnification coefficientηfor design value and ultimate capacity of the DKT-joint is obtained.The formulas of design value and ultimate capacity of the multi-planar DKT-joint containing internal stiffeners are derived based on current Standard for design of steel structures.Experiments and finite element analysis(FEA)results indicate that the formulas of design value and ultimate capacity of the multi-planar DKT joint containing internal stiffeners meet the precision requirements well,and can provide reliable reference for the design of similar joints in practical engineering.