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详细介绍了一跨度为44 m立体钢桁架-混凝土板组合楼盖的结构形式。采用基于壳单元和杆单元的有限元模型对组合空间桁架结构与普通钢桁架结构进行理论分析,对比得到了组合空间桁架结构的位移、轴力及混凝土板应力。介绍了组合空间桁架各杆件及上弦节点设计。研究表明,组合空间桁架上层混凝土板受压,应力分布比较均匀,可以充分发挥材料的强度,有效地节省材料;上弦杆轴力较普通钢桁架小的多;下弦杆轴力分布由支座向跨中逐渐增大;腹杆轴力分布由支座向跨中逐渐减小。
The structure of a span of 44 m three-dimensional steel truss-concrete composite floor cover is introduced in detail. The finite element model of shell element and rod element is used to analyze the combination of space truss structure and ordinary steel truss structure. The displacement, axial force and concrete slab stress of combined space truss structure are compared. The design of each bar and winding node of the combination space truss is introduced. The research shows that the compressive stress distribution of the upper concrete slab in the composite space truss is more uniform, which can give full play to the strength of the material and save the material effectively. The axial force of the winding rod is much smaller than ordinary steel truss. The axial force distribution of the lower chord Gradually increase in the cross; abdominal rod axial force distribution by the support gradually reduced.