摘要
APDL优化拱桥结构,在有限元程序环境下建立下承式拱桥的参数化模型,选取设计变量为纵梁厚度、拱圈厚度及吊杆半径,状态变量为最大挠度和最大应力,目标函数为总体积,通过子问题逼近方法进行多变量优化计算。结果表明,满足最大挠度和应力的条件下,各优化变量均达到收敛。纵梁厚度降低约48%,拱圈厚度降低约25%,结构最大应力为220 MPa。优化前后结构的自重明显降低,应力分布更加均匀合理。
Optimization of the structure of arched bridge based on APDL, the parameterized model of through arched bridge can be established in the finite element environment. Thickness of longitudinal beam, thickness of arch ring and radius of suspender are chosen as design variables,regarding maximum deflection and maximum stress as state variables, and taking total volume as objective function, using the subproblem approximation method to take approximation calculation. The analysis results show that under the maximum deflection and stress condition,all of the optimization variables might achieve convergence. Longitudinal thickness is reduced about 48%. Arch ring thickness is reduced about 25%. The structure maximum stress is 220 MPa. The weight decreased significantly before and after the optimization of structure, the stress distribution is more uniform and reasonable.
出处
《甘肃科学学报》
2015年第5期24-28,共5页
Journal of Gansu Sciences
基金
甘肃省自然科学基金项目(148RJZA007)
关键词
拱桥
APDL
子问题逼近方法
结构优化
Arched bridge
APDL
Sub-problem approximation method
Structural optimization
