西部干寒地区日照辐射及骤然降温引起的FRP加固混凝土箱梁温度效应研究

项目名称： 西部干寒地区日照辐射及骤然降温引起的FRP加固混凝土箱梁温度效应研究

项目编号： No.51268028

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 丁南宏

作者单位： 兰州交通大学

项目金额： 50万元

中文摘要： 国内外研究者对FRP加固混凝土结构的力学及使用性能进行了大量的试验研究与理论分析，并取得了丰硕的研究成果，但涉及FRP加固箱梁的研究较少，对FRP加固混凝土结构温度效应的研究也不够深入。本项目考虑西部干寒地区日照辐射强、昼夜温差大、相对湿度小的气候特点，通过室内外试验和辐射换热及热传导理论的分析，建立日照辐射及骤然降温引起的FRP加固混凝土箱梁温度场。通过对实测温度效应的分析，总结FRP加固混凝土箱梁纵、横两向温度应力及FRP-混凝土界面温度应力的一般规律。应用复合薄壁箱梁理论，建立FRP加固混凝土箱梁温度作用下控制微分方程，进而获得加固梁体温度效应的数值解和解析解。探求一种便于设计计算的FRP加固混凝土箱梁温度应力及FRP-混凝土界面温度应力的简化计算公式。本项目的研究将为西部干寒地区，FRP加固混凝土箱梁温度梯度模式的合理确定及加固设计计算提供可靠依据。

中文关键词： 混凝土箱梁；CFRP；加固；日照辐射；骤然降温

英文摘要： The domestic and foreign researchers made a great deal of experimental research and theoretical analysis on mechanical properties and functional performance of concrete structures reinforced by FRP, and achieved fruitful research results. However, in their studies, a few studies involved the box girder reinforced by FRP, and the study on temperature effects of concrete structure reinforced by FRP is not deep enough. Considering climatic characteristics of radiation intensity of sunshine, large temperature difference between day and night, and small relative humidity in dry and cold areas of the western China, the temperature field of concrete box girder reinforced by FRP is established caused by solar radiation and sudden drop in temperature respectively, by way of indoor and outdoor tests and analysis of radiation heat transfer theory and heat conduction theory.Based on an analysis of the measured temperature effect, the general laws of the longitudinal and horizontal temperature stress, as well as the interface temperature stress between FRP and concrete would be got. Then the control differential equations of the concrete box girder reinforced by FRP under the effect of temperature are to be established so as the numerical solution and analytical solution can be got.At last, some simplified formula would to b

英文关键词： concrete box girder；caber fiber reinforced polymer；reinforcement；solar radiation；sudden drop in temperature