基于影响矩阵法的大跨径混凝土斜拉桥索力优化

The Cable Force Optimization of Long-span Concrete Cable-stayed Bridge based on the Influence Matrix Method

斜拉索张拉索力对大跨径混凝土斜拉桥结构内力有重要的影响作用,有必要进行优化计算得到合理成桥索力,确定其合理成桥状态。论文以水阳江特大桥为工程背景,提出基于拉压和弯曲应变能之和的影响矩阵法,结合桥梁有限元软件Midas/Civil建立水阳江特大桥有限元模型,经过优化计算分析得到成桥优化索力。经过基于影响矩阵法优化得到的索力均匀合理,索力优化结果满足设计与施工要求,为同类桥梁设计与施工提供一定的借鉴意义与参考价值。

The tension force of stay cables has great influence on structural internal force of the long cable-stayed bridge,it’s necessary to optimize the calculation to get reasonable cable force to determine its reasonable e as-built bridge stage.The shuiyang river bridge is taken as the engineering background in this paper,and the finite element software Midas/Civil is used to establish model of the shuiyang bridge model.The influence matrix method based on the sum of strain energy of tension,compression and bending is proposed to obtain the optimum cable force of as-built bridge state by optimization calculation and analysis.The optimized cable force based on the influence matrix method is uniform and reasonable,and meets the design and construction requirements.It will provide some reference and reference value for similar bridge design and construction.