预应力双层柱面网壳结构的布索方案研究

Research on cable layout scheme of prestressed double layer cylindrical lattice shell structure

预应力双层柱面网壳结构是将现代预应力技术引入双层柱面网壳当中,使网壳产生与荷载作用方向相反的位移,从而提高结构承载力,改善结构不合理受力的结构体系.目前,对于球面网壳、单层柱面网壳结构的研究已经日趋完善,而双层柱面网壳结构,尤其是预应力双层柱面网壳结构的研究相对较少.因此,选取大跨度的双层柱面网壳结构,利用有限元法,选择对结构受力有利的4种布索方案,结合3种荷载工况,并考虑结构矢跨比、网壳跨度、网壳厚度进行对比分析.

The paper with modern prestressed technology makes analysis of prestressed double layer cylindrical lattice shell structure which improves the structural bearing capacity and avoids the structural unreasonable bearing style by making displacement in the opposite direction of the load.It is known that the study of spherical shell,single-layer cylindrical lattice shell structure has been more perfect,however,the study of double-layer lattice shell structure,and especially the prestressed double layer cylindrical lattice shell structure is relatively rare.Therefore,the double layer cylindrical lattice shell structure of large span is selected as an example in this paper to discuss the effects of different cable layout schemes on the structural stress.Four kinds of cable layout schemes are compared by means of the finite element method under three load conditions in consideration of the structural rise-span ratio,lattice shell span and shell thickness.