【作者】 曹迈； 王泽宇； 李全旺； 肖雄；

【Author】 CAO Mai;WANG Ze-yu;LI Quan-wang;XIAO Xiong;Department of Civil Engineering, Tsinghua University;

【机构】 清华大学土木工程系；

【摘要】 基于可靠性的结构优化设计在考虑偶然风险和认知风险的工程设计领域有重要应用,它使结构和基础设施系统的优化能够在各种不确定因素下朝着成本更低的目标进行。传统的双环的方法,如RIA,耦合了优化设计和可靠性分析,求解困难,计算代价昂贵。本文采用将优化设计与可靠性评估解耦的SORA方法(即序贯优化与可靠性评估)来优化混凝土结构的几何尺寸。通过数值研究和与蒙特卡罗模拟方法的比较,验证了该方法的计算效率和精度。更多还原

【Abstract】 Reliability-based Design Optimization(RBDO) dominates in the field of probabilistic engineering design that considers aleatoric and epistemic risks. In civil engineering, it enables optimization for structures and infrastructure system be conducted toward the goal of ‘less costly’ under various uncertainties. Conventional double loop-based method such as RIA that integrates algorithmic optimization and reliability analysis, leads to substantially computational insufficiency. In this paper, the SORA method(i.e., Sequential Optimization and Reliability Assessment) that decouple the optimization design and reliability assessment is adopted to optimize the geometry of a concrete structure. Computational efficiency and accuracy are demonstrated by numerical investigation of the proposed framework and comparison to the approach through Monte Carlo simulation.更多还原