摘要
为分析钢筋混凝土拱桥主拱圈随服役时间的可靠性退化规律,提出一种基于改进灰狼算法(IGWO)-Kriging模型的钢筋混凝土拱桥主拱圈应力可靠度分析方法。该方法首先基于钢筋锈胀机理和结构可靠度理论建立钢筋混凝土拱桥主拱圈应力可靠度功能函数;然后采用改进Sine混沌映射、非线性距离控制系数与高斯变异策略改进的IGWO,基于IGWO与Kriging构建钢筋混凝土拱桥结构响应面模型,提出钢筋混凝土拱桥主拱圈应力可靠指标求解方法。以贵州沿河沙坨大桥为背景,采用MIDAS Civil软件建立结构有限元模型并基于IGWO-Kriging模型拟合结构响应面,分析钢筋锈胀对主拱圈应力可靠指标的影响。结果表明:基于IGWO-Kriging的结构响应面模型可以精准拟合钢筋混凝土拱桥的结构响应特性,IGWO对Kriging模型参数寻优精度高、收敛速度快;随着服役时间增加,钢筋锈胀作用对主拱圈应力可靠指标的影响愈发明显,与不考虑钢筋锈胀作用的情况对比,考虑钢筋锈胀作用的主拱圈需要维修加固的时间提早了15年。
This study investigates the reliability degradation of arch ring in the reinforced concrete arch bridge as its age increases.An analysis method based on IGWO(Improved Grey Wolf Optimizer)-Kriging model is presented.First,an arch ring stress reliability function of the reinforced concrete arch bridge grounded on rebar rust expansion and structural reliability theory is established.Then,a method to resolve the arch ring stress reliability indicator is proposed,using the modified Sine chaotic mapping,nonlinear distance control coefficient and the IGWO improved by adopting the Gaussian mutation strategy,on the basis of the structural response surface model that is developed based on the Kriging model.The Yanhe Shatuo Bridge in Guizhou Province is used as a case for the study.A finite element model was built up in MIDAS Civil to analyze the influence of rebar rust expansion on the arch ring stress reliability,based on the structural response surface fitted by the IGWO-Kriging model.The improved IGWO method generates high-precision parameter optimization in the Kriging model and shows fast convergence speed.As the age of the bridge increases,the influence of the rebar rust expansion on the arch ring stress reliability gets more remarkable.Compared with the condition exclusive of the action of rebar rust expansion,the demanded maintenance of the arch ring comes about 15 years earlier,considering the action of rebar rust optimizer.
作者
张基进
韩洪举
郭吉平
田仲初
张祖军
ZHANG Jijin;HAN Hongju;GUO Jiping;TIAN Zhongchu;ZHANG Zujun(Guizhou Road&Bridge Group Co.,Ltd.,Guiyang 550018,China;Guizhou Communications Construction Group Co.,Ltd.,Guiyang 550005,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Civil Engineering and Architecture,Hunan University of Arts and Science,Changde 415000,China)
出处
《桥梁建设》
北大核心
2025年第4期77-83,共7页
Bridge Construction
基金
国家自然科学基金项目(52078058,51478049)
贵州省交通运输厅科技项目(2017-123-007)
湖南文理学院博士科研启动项目(24BSQD45)。
