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钢管拱桁架是大跨度空间结构的一种常用形式,采用相贯节点由钢管直接焊接而成,因其整个结构简洁大方,受力合理,施工方便且又能充分满足人们对大跨度大空间的需求而获得了广泛应用。但是目前对于拱桁架的设计国内尚无专门的标准。为了有效增加结构的利用空间,本文针对在3D3S中设计的矢跨比为0.3的150m三心圆钢管拱桁架,采用SAP2000分析软件,以结构在恒荷载和雪荷载作用下的内力和变形作为初始条件,选用EL波对其进行了考虑材料非线性和几何非线性的弹塑性动力时程分析。采用塑性铰理论来判别结构塑性发展程度及破坏形态,分别得出结构进入屈服和发生破坏时的临界加速度峰值,以及结构在临近破坏时的位移值和塑性铰占有比例,并据此分析其抗震性能。
Steel arch truss is a commonly used form of large-span space structure. It adopts the joint of steel pipe directly welded, because of its simple and elegant structure, reasonable force, convenient construction and enough to meet people’s requirements for large-span large-space Demand has been widely used. However, there is no specific standard for the design of arch trusses at home. In order to effectively increase the use of space structure, this paper aimed at the 3D3S design of the span-to-cross ratio of 0.3 of the three-round steel tube arch truss, using SAP2000 analysis software, the structure under constant load and snow load under the action of internal forces and deformation as the initial Conditions, the choice of EL wave material to consider its nonlinear and geometric nonlinear elastic-plastic dynamic time history analysis. The plastic hinge theory is used to determine the degree of plasticity development and the failure mode. The critical acceleration peak values of the structure in yielding and failure are respectively obtained, and the displacements of the structure near the failure and the proportion of plastic hinge occupancy, performance.