论文部分内容阅读
掌握车辐式张拉结构的找形方法和了解体型对结构受力性能的影响,是设计该类轻型屋面的关键,为此结合理论推导和数值模拟方法对这两方面展开研究。首先,引入力密度法用于结构初始平衡态的确定,提出“由形找力再找形”的思路,从而避免了拓展力密度法收敛性差的缺点,成功实现了马鞍形车辐式张拉结构的找形分析。然后,分别从内外环平面投影、外环空间形态以及索桁架形式等多个角度对单、双层车辐式结构的体型进行比选,分析不同体型结构的适用性和结构刚度的主要影响因素。研究结果表明:内外环形状相似对车辐式结构最为有利;马鞍形外环的高差对结构刚度影响很小;凸索桁架能有效提高结构刚度,但应注意避免侧向失稳。
It is the key to design this type of lightweight roof to grasp the method of finding the shape of the vehicle-spoke tension structure and to understand the effect of the size on the mechanical performance of the structure. Therefore, the two aspects are studied based on theoretical derivation and numerical simulation. First of all, the introduction of force density method for the determination of the initial equilibrium state of the structure, put forward the idea of “find the shape and find the shape by the shape”, thus avoiding the shortcoming of the convergence of the force density method is poor, the successful realization of the saddle-shaped vehicle spoke Finding Analysis of Tension Structure. Then, comparing the body shape of the single and double-spoke structures from the plane projection of the inner and outer rings, the shape of the outer ring and the form of the cable trusses, the main influencing factors of the applicability of different size structures and the structural rigidity are analyzed . The results show that the shape of inner and outer rings is most favorable to the vehicle spoke structure. The height difference of the saddle outer ring has little influence on the structural rigidity. The convex truss can effectively improve the structural rigidity, but the lateral instability should be avoided.