While bearing load, the top chords of the grid structure usually withstand pressure and the bottom chords withstand tension. Too often the main control effect of the whole structure relies on compression bars, not pull roles. As a result, in order to reduce the steel consumption the mechanical behavior of the compression bars must be improved. The cable-pole composite grid replaces the bottom pulled roles with high-strength pre-stressed cable completely or partly, which can lead to the reversed deflection of the whole grid through the pre-stressed stretching of the cable. Thus the mechanical behavior of the compression top bars can be improved as the generated pretension in the top chords. Conducting the research to a project through the AnsyslO.O, it points out the optimization direction of grid structure and some advantages of the cable-pole composite grid, thus it can provide some reference meaning to the analysis of similar grid in the future.%普通网架结构承受荷载时一般上弦杆件受压而下弦杆件受拉,往往在整个结构中起控制作用的是压杆而非拉杆.因此必须改善压杆受力以达到减少网架结构用钢量目的.索-杆组合网架采用高强预应力索部分代替或全部代替网架中的受拉下弦杆.通过下弦索的预应张拉,使整个网架产生反拱,从而使上弦杆产生预拉力,有望改善上弦压杆受力.通过Ansys10.0有限元分析软件对一工程实例进行研究,指出普通网架结构优化方向及该索-杆组合网架的一些优势,对今后同类网架研究具有借鉴意义.
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