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以贵阳奥体中心主体育场工程为背景,针对空间钢管桁架屋盖受拉上弦相贯节点,进行足尺节点极限承载力破坏试验。对节点试验过程和破坏现象进行了深入研究,分析了各加载阶段相贯节点的应力分布情况及整个加载过程塑性区的开展过程,结合有限元分析对空间相贯节点破坏机理进行分析研究,并应用有限元软件模拟试验加载过程进行非线性计算,分析节点破坏准则。按提出的节点设计承载力准则判定节点设计承载力,并与规范计算值进行比较。针对规范主弦杆受拉则不考虑主弦杆轴力变化对节点承载力的影响,进行主弦杆轴力变化对节点承载力影响的非线性有限元分析,并与规范计算值比较。研究表明,无论支弦杆受拉或受压,随主弦杆拉力的增加,节点承载力逐渐降低。
Taking the main stadium project of Guiyang Olympic Sports Center as the background, the ultimate bearing capacity failure test of full-scale joints is carried out for the tensioning and capping joints of space steel truss roof. The experimental process and failure phenomenon of the joints were studied in depth. The stress distribution of the joints at each loading stage and the development of the plastic zone during the loading process were analyzed. The failure mechanism of the joints was analyzed by finite element analysis Finite element software simulation test loading process is used for nonlinear calculation and node failure criterion is analyzed. According to the proposed design criteria of bearing capacity, the designed bearing capacity of the joint is determined and compared with the calculated values. In view of the influence of main chord tension, the influence of main chord axial force on node bearing capacity is not considered. The nonlinear finite element analysis of the influence of main chord axial force on node bearing capacity is carried out and compared with the calculated value. The research shows that the bearing capacity of joints decreases gradually with the increase of the tensile force of the main chord, no matter the tension or compression of the chord.