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空钢管桁架N型节点易发生压陷破坏,为了使杆件破坏先于节点破坏而发生,提出了在弦杆内灌浆以提高节点压陷承载力的设想.进行了8个灌浆方钢管桁架N型节点的承载力试验.基于试验结果,进行了试件的几何参数分析,研究了套箍系数、支杆间隙和支主杆边长比等参数对节点性能的影响.基于试验结果和模拟分析结果,揭示了这类节点的受力机理与破坏模式,提出了对应于不同破坏模式的节点承载力计算公式:N型受压节点及受拉节点承载力分别按弦杆压陷破坏和冲剪破坏模式进行计算;弦杆的承载力要按弦杆直剪破坏模式进行校核.
N type joints of hollow steel trusses are prone to collapse and collapse, and in order to make the failure of the members occur prior to the failure of the joints, the idea of grouting in the chord to improve the bearing capacity of nodal collapse is proposed. Eight grouted square steel trusses N Based on the experimental results, the geometrical parameters of the specimen were analyzed and the influence of parameters such as hoop coefficient, strut clearance and strut length ratio on the joint performance was studied.Based on the experimental results and simulation analysis As a result, the stress mechanism and failure modes of such nodes are revealed, and the formulas of bearing capacity of nodes corresponding to different failure modes are proposed. The bearing capacity of N-type compression joints and tension joints are respectively calculated according to chipping, Failure mode calculation; chord bearing capacity according to the chord straight shear damage mode check.