钢筋混凝土圆形单柱桥墩粒子群延性抗震优化

Ductility Seismic Optimization of Reinforced Concrete Single Circular Bridge Pier Based on Particle Swarm

为了优化钢筋混凝土桥墩结构抗震设计,采用粒子群优化算法和反应谱分析方法,以截面特性和配筋率为设计变量,以抗震需求能力比为目标函数,建立了规则桥梁圆形单柱桥墩的抗震优化设计框架.计算结果表明:设计优化后与原设计相比,截面半径增加9.28%,纵向钢筋配筋率和横向箍筋配筋率分别增加7.76%和11.63%时,抗弯轴力、抗弯弯矩、抗剪及位移延性需求能力比分别降低了10.96%,9.15%,3.39%和29.92%;该方法实现了多目标需求最优设计参数的快速获取.

To optimize the reinforced concrete pier structure design,particle swarm optimization algorithm and response spectrum method were combined to build a seismic design optimization framework of regular single circular bridge pier.The optimization adopted cross-section characteristic and reinforcement ratios as variables and seismic demand ability ratios as obj ective functions.The calculation indicated:Compared with the original design,the demand ability ratio of anti-bending axial force,anti-bending moment,anti-shear and displacement ductility decreased 10.96%,9.15%,3.39% and 29.92% respectively as the radius, longitudinal and transverse reinforcement ratio increased 9.28%,7.76% and 11.63% respectively;The proposed design achieved the optimum parameters to meet the multi-obj ective needs quickly.