北京北站张弦桁架结构模型试验研究

Experimental study on truss string structure of Beijing North Station

张弦桁架结构具有自重轻、跨度大及整洁美观等优点。目前有关张弦桁架结构的试验研究大多以单榀为主,为了了解此种结构的空间受力性能,以北京北站张弦桁架结构为原型,制作了一几何缩尺比例为1∶10的5榀空间张弦桁架结构试验模型。首先介绍了北京北站张弦桁架结构雨棚的工程概况,其次描述了该试验模型的制作及组装过程,最后对其在多种荷载工况作用下的多级静力加载等内容进行了理论分析和试验研究。研究结果表明:虽然试验模型在垂直张弦桁架跨度的方向上布置了刚度较大的立体联系桁架和平面联系桁架,但是荷载传递的路径仍然是以沿着张弦桁架跨度方向的单向传递为主;空间张弦桁架结构承受非对称荷载能力强。

Truss string structure features light weight,large span,clean and beautiful appearance.The current experimental research on the truss string structure is mostly based on one piece.Taking Beijing North Station as a prototype,in this paper 5-piece truss string structures experimental specimens were manufactured with a scale ratio of 1∶ 10.Brief discription on truss string structure platform canopy of Beijing North Station was firstly presented,then the manufacturing and assembly processes of the specimens were introduced.Multiple loading cases and multi-step loading were finally analyzed.The experimental results show that the loading transmission of spatial truss string structure is still primarily along the truss span,in spite of the fact that the three-dimensional relation truss and the plane relation truss with greater rigidity are placed to the experimental specimens vertically along the truss span.And the spatial truss string structure has good load bearing capacity under half-span load.