以大跨径高墩连续刚构桥为例,借助Midas Civil有限元软件建立模型,获取成桥25年墩顶水平位移、优化方程参数等数据,并对算法优化效果进行评价.程序算法以控制桥墩的最大拉应力、最大变形量与协同工作性能为指标,分析桥梁优化效果.研究结果表明:顶推力施工显著改善了桥墩变形;控制断面弯矩由无顶推力的13 187.6 kN·m减小至1 198.9 kN·m;复杂桥墩结构的刚构桥的最大拉应力控制断面不一定为墩顶或墩底断面;基于蚂蚁算法的方案可有效减小原设计的桥墩最大拉应力,使最大拉应力从2.19 MPa减小至1.58 MPa;方案可有效控制成桥墩顶的水平变形量,在减小最大拉应力的同时,使总变形量由40.17 cm减小至39.65 cm.
Optimization of Jacking Force of Continuous Rigid Frame Bridge Based on Ant Algorithm
Selecting a large-span high-pier continuous rigid frame bridge as an example,the data of pier-top horizontal dis-placement for 25 years and parameters of optimization equation are obtained by establishing models in Midas Civil,with which the algorithm optimization is evaluated.The program algorithm analyzes the effect of bridge optimization with indicators of con-trolling the maximum tensile stress,the maximum deformation and synergistic performance of the bridge piers.The study results show that the thrust construction has significantly improved the bridge pier deformation,for the control section ben-ding moment is reduced from 13 187.6 kN·m without thrust to 1 198.9 kN·m,and the control section of the maximum ten-sile stress of the rigid-frame bridge with complex pier structure is not necessarily the top or bottom pier section.The method based on ant colony optimization algorithm can effectively reduce the originally designed maximum tensile stress of the bridge piers,which reduces the maximum tensile stress from 2.19 MPa to 1.58 MPa.And the method can effectively control the hor-izontal deformation of top-pier,reducing the maximum tensile stress while reducing the total deformation from 40.17 cm to 39.65 cm.
continuous rigid frameMATLABant algorithmoptimization of jacking force
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