太原植物园大跨悬挑钢结构优化分析

Optimization analysis of Large Span Cantilever Steel Structure in Taiyuan Botanical Garden

针对太原植物园原设计结构中应力较低、截面尺寸偏大的构件进行优化分析,利用MIDAS Gen对优化后的结构进行计算,结果表明在最不利工况及地震作用下,优化后的结构仍能满足设计及相关规范要求。对于结构中构造复杂、受力较大的相贯节点,提出了不同的加强构造措施,利用ABAQUS软件进行节点的有限元分析,考察节点在控制工况下的受力状态。结果表明,在最不利工况下,节点区域容易出现应力屈服,但通过适当的节点域加强构造措施,可以有效改善其受力性能,提高承载能力,使其满足节点的受力性能要求,证明了结构的优化方案是可行的。

The main entrance building in Taiyuan Botanical Garden is a large-span cantilever steel structure with novel appearance,but the mechanical behavior of the structure is complicated.In this paper,the optimization of the components with low stress and large size in the previously designed structure was conducted,and the analysis of the optimized structure was conducted using MIDAS/Gen software.The results showed that the stress and deformation of the structure can still meet the requirement of design specifications under the most unfavorable load condition and earthquakes.Moreover,for the intersecting joint area with complex construction and large force,different reinforcement measures were proposed,and the finite element analysis of the joint was carried out using ABAQUS software to investigate the stress state of the intersecting joint area under the control condition.The results showed that stress yielding is prone to occur at the intersecting area of joint under the most unfavorable load conditions.However,appropriate stiffening measures in intersecting area can effectively improve its mechanical performance and bearing capacity,which indicates that optimization measure for this structure is feasible.