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为进一步明确体内张拉成形空间网格结构受力性能,以垂跨比和矢跨比为外形设计参数,根据结构张拉成形后的矢跨比和垂跨比组合的不同,建立12个体内张拉成形空间网格结构计算模型;选用ANSYS有限元程序,通过理论分析详细的研究垂跨比和矢跨比对结构轴力、弯矩和应力的影响特点;设计制作了2个跨度为4.8m的体内张拉成形空间网格结构模型,进行张拉成形和静载试验,进一步研究其影响特点,对理论分析结果进行验证。结果表明:体内张拉成形空间网格结构的垂跨比及矢跨比是影响结构成形及受荷性能的重要参数,结构成形阶段以弯曲应变为主,受荷阶段以轴向压应变的增加为主,合理的矢跨比和垂跨比组合可以明显改善结构受力性能。
In order to further clarify the mechanical properties of the lattice structure in tension forming space, the design parameters of vertical and horizontal cross-ratio were taken as the shape design parameters. According to the ratio of sag-span ratio and vertical- Tension forming space grid structure calculation model; selection of ANSYS finite element program, through the theoretical analysis of the vertical and horizontal-to-vertical ratio of cross-ratio of the structure of the axial force, bending moment and stress characteristics; designed and manufactured two span 4.8 m body tension forming space grid structure model, tensile forming and static load test to further study the impact of the characteristics of the theoretical analysis to verify the results. The results show that the ratio of vertical to vertical span-to-span is the important parameter that affects the forming and load-bearing properties of the structure. The bending deformation is the main factor in the forming stage and the axial compressive strain The main combination of reasonable ratio of sag ratio and sag ratio can obviously improve the performance of the structure.