设计-施工承包模式下单层球面网壳的优化

Optimization Design Of Single-layer Spherical Reticulated Shell under Design-build Mode

设计-施工承包模式下单层球面网壳的优化不只是一个降低用钢量的问题。采用均匀迭代设计法进行该模式下单层球面网壳的优化设计。采用杆件截面类型数近似代替项目工期、施工的设备条件、施工人员的素质、施工难度、管理费等因素。通过简化,以满足位移、应力、稳定性条件的网壳用钢量最轻和杆件截面类型数最少为目标。以60m跨凯威特型单层球面网壳的优化设计为算例说明该方法的运算过程。该方法减少了试验次数,收敛速度快。

The optimization design of single layer spherical reticulated shell under DB mode is not only to reduce the amount of steel. The optimization of single layer spherical reticulated shell was carried out by the uniform iterative design method in this mode. The type number of bar cross section was used to approximate the project duration,the construction of equipment conditions,the quality of construction personnel,construction difficulty and management fees. By simplifying,the objective function is to satisfy the displacement,stress and stability conditions of the minimum number of bar cross section types and the minimum steel consumption. Taking the optimum design of a 60 m span Kiewitt single-layer spherical reticulated shell as an example the operation of the method was illustrated. This method reduces the number of tests,and the convergence rate is fast.