基于响应面法的钢-混组合桥面系优化设计

对桥梁结构进行优化设计和可靠性研究时,采用传统的设计方法可能会遇到计算工作量繁重的问题,应用响应面法进行优化设计是有效解决该问题的途径之一。以某大跨悬索桥钢-混组合桥面系为研究对象,结合节段缩尺模型试验研究,以有限元软件Workbench为计算平台,建立相应的参数化有限元模型。以组合桥面系重量最轻为经济目标,最大变形及最大弯曲应力为约束,基于响应面法对其进行多参数优化设计,并对优化结果进行了有限元分析验证。计算结果表明:节段缩尺模型静力试验结果与有限元分析结果吻合较好,建立的有限元模型很好地反映了试验模型实际的受力状态;基于响应面法优化设计后组合桥面系质量减小了3.57%,在满足力学性能要求的同时,减轻了结构自重,降低了工程造价,为钢-混组合桥面系设计提供了良好的概念设计模型。

Optimization Design of Steel-concrete Composite Deck System Based on Response Surface Method

In the process of optimization design and reliability research,the engineers may encounter heavy calculation if using traditional design method.Applying the response surface method is a way to solve the problem effectively.In this paper,a steel-concrete composite deck system was taken as the research object.Combined with the experimental study of the Segmental scale model,corresponding parametric finite element model was established.Taking minimum quality of the composite bridge deck as the goal;the maximum deformation and maximum bending stress as constraint,the author carried out a multi-parameter optimization design based on the response surface method.Finite element analysis verified the accurateness of optimization results.Results showed that results of static test are in good agreement with the results of finite element analysis.The finite element model is a good way to reflect the stress situation of the experimental model.Optimization design based on the response surface method satisfied the mechanical performance requirements and reduced 3.34%of the structural weight,which providing a good conceptual design model for the steel-concrete composite bridge.