上海源深体育馆预应力张弦梁优化设计与试验研究

Design optimization and experimental study on prestressed beam string of Shanghai Yuanshen Arena

探讨了预应力张弦梁的挠度限值、有效预应力以及下弦钢索的安全系数等设计原则问题,并提出了有关设计建议。在此基础上,基于有限元软件ANSYS 9.0对上海源深体育馆预应力张弦梁的矢跨比、上弦截面尺寸与钢索面积等主要设计参数进行了分析优化,并采用一阶方法对钢索的有效预应力进行了优化设计。以优化后的结构方案为原型,通过缩尺模型试验和非线性有限元分析,对原型结构的预应力张弦梁在张拉阶段、正常使用阶段以及承载力极限阶段的全过程受力性能进行了研究。结果表明,上海源深体育馆预应力张弦梁结构具有良好的受力性能和较大的安全储备,非线性有限元计算值与试验结果吻合良好。

Design principles for beam string structures, such as deformation limits, effective prestressing and safety factors for cables were discussed and the corresponding suggestions were proposed. The rise-to-span ratio, beam cross-section and area of the cables of the beam string structure used in Shanghai Yuanshen Arena were analyzed and compared by FEM software ANSYSY 9.0. In addition, design optimization was conducted for the effective prestressing of the cables by using the firstorder method. Based on the optimized structural scheme, this paper investigated the full-range behaviors of the prestressing beam structure during the stretching phase, serviceability phase and ultimate load-carrying phase according to scaled model tests and nonlinear finite element analysis. Studies show that the structure develops larger load capacities and safety reserve, and the analytical results calculated by the nonlinear FEM are in good agreement with the test results.