基于响应面法的PC 箱梁桥病害成因敏感性分析  

Sensitivity Analysis of Disease Causes in PC Box Girder Bridges Based on Response Surface Method

作　　者：陈富琨 李岩 罗锦鸿 张文学[1] 何源 CHEN Fukun;LI Yan;LUO Jinhong;ZHANG Wenxue;HE Yuan(Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China;Shandong Hi-speed Construction Management Group Co.,Ltd.,Shandong 250014,China)

机构地区：[1]北京工业大学城市建设学部,北京100124 [2]山东高速建设管理集团有限公司,济南250014

出　　处：《铁道建筑》2024年第6期90-95,共6页Railway Engineering

摘　　要：基于响应面法通过抽样计算有限元模拟结果,建立了预应力混凝土(Prestressed Concrete,PC)连续箱梁桥典型病害的函数关系,研究PC连续箱梁桥开裂和下挠的病害成因以及影响因素权重。响应面方程包含7个结构参数和4个结构响应,从敏感因子和敏感百分比分析病害成因和影响因素的关联性。结果表明:悬臂顶板束、中跨合龙束和腹板束预应力损失是造成箱梁挠度过大的主要原因,三者的敏感百分比分别为35.0%、21.7%和19.9%。中跨合龙束和悬臂顶板束预应力损失是造成跨中箱梁底板横向裂缝的主要原因,二者敏感百分比分别为46.1%和36.1%。悬臂顶板束预应力损失是造成墩顶箱梁顶板横向裂缝的主要原因,敏感百分比达到67.8%。腹板束、悬臂顶板束、中跨合龙束和竖向预应力束的预应力损失是造成腹板斜裂缝的主要原因。Based on the response surface method,the function relationship of typical defects in prestressed concrete(PC)continuous box girder bridges was established by sampling and calculating finite element simulation results,and the causes and influencing factor weights of cracking and deflection in PC continuous box girder bridges were studied.The correlation between disease causes and influencing factors was analyzed through sensitivity factors and sensitivity percentages.The results show that the prestress loss of the cantilever top slab,mid-span closure diaphragm,and cantilever web slab is the main cause of excessive deflection of the box girder,with sensitive percentages of 35.0%,21.7%,and 19.9%,respectively.The prestress loss of the mid-span closure diaphragm and cantilever top slab is the main cause of transverse cracks in the bottom slab of the mid-span box girder,with sensitive percentages of 46.1%and 36.1%,respectively.The prestress loss of the cantilever top slab is the main cause of transverse cracks in the top slab of the pier-top box girder,with a sensitive percentage of 67.8%.The prestress loss of the cantilever web slab,cantilever top slab,mid-span closure diaphragm,and vertical pre-stressed tendons is the main cause of diagonal cracks in the web slab.

关 键 词：PC箱梁桥 病害成因 响应面法 敏感性分析 预应力损失 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]