大跨度预应力拱桁架煤棚布索方案研究

Research on cable arrangement of large-span prestressed arch truss coal shed

针对大跨度预应力拱桁架煤棚,提出3种布索方案,对这3种方案下的预应力拱桁架进行静力及稳定性分析,分别从结构的用钢量、索初始预拉力、杆件内力分布、位移、水平支反力、以及结构稳定性这6个方面与未布索拱桁架作综合对比。结果表明:3种布索方案与未布索拱桁架相比,能有效降低结构内力峰值,使结构的内力分布更加合理,提升结构的刚度,降低结构的支座反力,提高结构的稳定性。布索方案3(V字撑内凹式索拱桁架结构)各受力性能指标与未布索拱桁架相比提升最明显,是最优方案,但对于储煤结构的应用而言,也应同时考虑施工难易情况。

For the large-span prestressed arch truss coal shed,three kinds of cable arrangement schemes were proposed.The static and stability analysis of the prestressed arch trusses under these three schemes were carried out.Three schemes were compared with the arch truss scheme without cables,from six perspectives including the steel amount of the structure,the initial pre-tension of the cable,the internal force distribution of the rod,the displacement,the horizontal reaction force,and the structural stability.The results show that compared with the arch truss scheme without cables,the three kinds of cable arrangement schemes can effectively reduce the peak internal force of the structure,make the internal force distribution of the structure more reasonable,improve the rigidity of the structure,reduce the bearing reaction force of the structure,and improve the stability of the structure.Compared with the arch truss scheme without cables,the mechanical performance indexes of the third cable arrangement scheme(V-braced concave cable arch truss structure)have the most obvious improvement,which is the optimal scheme.However,for the application of coal shed structure,the construction difficulty should also be considered.