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具有几何大变形的体内预应力钢结构在成形过程中索与结构的接触摩擦将会耗散大量能量,为了准确确定索力和结构内力,本文采用接触有限元法(简称接触算法)对体内预应力钢屋架结构进行成形过程研究。与模型试验结果相比,用接触算法计算的索力和结构内力与试验结果吻合较好。本文还对比了结构成形过程采用接触算法和施加温度载荷算法(简称温度算法)的结构内力,结果表明温度算法可能存在安全隐患,文中提出安全设计建议,并指出引入接触算法的必要性。
For the prestressed steel structure with large geometric deformation, the contact friction between the cable and the structure during the forming process will dissipate a large amount of energy. In order to accurately determine the cable force and the structural internal force, the contact finite element method (referred to as the contact algorithm) Research on forming process of stress steel truss structure. Compared with the model test results, the contact force calculated by the contact method and the structural internal force are in good agreement with the experimental results. In this paper, we also compare the internal forces of the structure using the contact algorithm and the temperature load algorithm (temperature algorithm). The results show that the temperature algorithm may be a potential safety hazard. The safety design proposal is put forward and the necessity of introducing the contact algorithm is pointed out.