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多重弦支网格梁结构由上部单层网格梁和下部多重弦支结构组成。上部单层网格梁为双向正交正放连续网格梁,下部多重弦支结构由主索、次索、竖向撑杆以及斜拉钢棒构成,上下两部分结构共同工作形成空间结构整体。通过主索、次索两端施加预加应力,使所有索张紧、竖向撑杆受压、上部网格梁整体上拱,改善单层网格梁受力和变形特性,提高其承载力和稳定性;通过山西体育中心三馆屋盖钢结构体系选型分析,将多重弦支网格结构与张弦梁结构的受力性能进行对比分析,研究表明:多重弦支网格梁结构具有更好的空间作用效应,提高其整体结构的稳定性和承载力。
Multi-chord grid beam structure consists of the upper single-layer grid beam and the lower multiple chord structure. The upper monolayer grid beam is two-way orthogonal orthoganal continuous girder, the lower multiple-chord structure is composed of main cable, sub-cable, vertical strut and inclined steel bars, and the upper and lower parts work together to form the whole space structure . The prestressing force is applied to both ends of the main cable and the secondary cable so that all the cables are tensioned and the vertical strut is pressed. The upper grid beam is entirely arched to improve the stress and deformation characteristics of the single-layer grid girder and improve the bearing capacity and stability Based on the analysis of the roof steel structure system of the third gymnasium of Shanxi Sports Center, the multi-string lattice structure is compared with that of the beam string structure. The results show that the multi-string grid structure has better space Effect, improve the stability and carrying capacity of its overall structure.