新型预应力组合钢桁架的有限元参数化分析

Finite Element Parametric Analysis of New Type Prestressed Steel Truss

连云港市某高层建筑结构,由于跨度较大,荷载较大,因此在长跨方向的主梁采用新型预应力钢桁架结构。预应力钢桁架结构上弦为组合梁,主梁跨度方向在下弦圆钢管内布置直线预应力筋,采用SAP2000对其中1榀钢桁架进行有限元参数化分析,研究腹杆截面、混凝土板厚度、预应力筋根数、预应力筋张拉控制应力以及桁架高度的变化对承载力和变形的影响,所得结论可供设计参考。

This project is a high-rise building structure of Lianyungang City. Because the span is large and the load is bigger, the long span main beam adopts the new prestressed steel truss structure. The prestressed steel truss structure is the composite beam and the span of the main beam is arranged in the lower chord round steel tube. A finite element parametric analysis of the steel trusses is carried out by SAP2000. The influence of the cross section of the truss, the thickness of the concrete slab, the number of stress tendons, the tension stress of prestressing tendon and the truss height on the bearing capacity and deformation is analysised. The conclusions can be used as reference for design.