正交异性钢桥面板焊缝强度的不确定性评估

Uncertainty Evaluation of Weld Strength of Orthotropic Steel Bridge Deck

针对正交异性钢桥面板设计中关键的尺寸存在不确定性的问题,构建了焊缝强度不确定分析的数值模式.利用响应面法建立焊缝强度与参数之间关系代理模型,可有效避免不确定分析中需要反复进行复杂的有限元分析.不确定分析与DE演化算法相结合,可以快速进行不确定性计算,提升计算效率.文中算例分别给出了各设计参数在不同设计样本下的不确定数值结果,并进行对比分析.数值结果表明:所构建的不确定性数值模式能有效地考虑多种不确定因素的影响,有效反映了设计参数变化与焊缝强度之间的关系,可避免初始设计阶段进行确定性设计时过于保守的估计.

Absrtact: Aiming at the problem of uncertainty in the key dimensions in the design of orthotropic steel bridge plate, a numerical model for uncertainty analysis of weld strength is constructed. The response surface method is used to establish the proxy model of the relationship between weld strength and design parameters, which effectively avoids the need for repeated complex finite element analysis in the uncertain analysis. The examples give the uncertain numerical results of each design parameter under different design samples and make comparative analysis. The numerical results show that the uncertainty numerical model can effectively consider the influence of various uncertain factors, effectively reflect the relationship between design parameter changes and weld strength, and avoid overly conservative estimation in the initial design stage of deterministic design.