日照作用下混凝土箱梁竖向温度梯度场研究  

Research on vertical temperature gradient field of concrete box girder under sunshine temperature load

作　　者：周记国[1] 钟新谷[2] 王桂花[1] 薛晓锋[3] 

机构地区：[1]白城师范学院土木工程学院,吉林白城137000 [2]湖南科技大学土木工程学院,湖南湘潭411201 [3]长安大学公路学院,陕西西安710064

出　　处：《合肥工业大学学报（自然科学版）》2016年第2期223-227,243,共6页Journal of Hefei University of Technology：Natural Science

基　　金：中央高校基本科研业务费专项资金资助项目(CHD2011JC195);特大型桥梁综合防灾减灾理论与方法研究资助项目(2011318223170)

摘　　要：文章以混凝土连续刚构箱梁桥为研究对象,应用热成像仪实地观测日照温度荷载作用下混凝土箱梁桥中的温度场日变化规律,并分析其最大竖向升、降温温度梯度荷载分布形式及大小;采用ANSYS软件数值模拟分析温度梯度荷载在结构中产生的效应,同时与现行规范进行分析对比。分析结果表明:日照温度荷载在混凝土箱梁桥中产生的竖向升、降温温度梯度场呈曲线型分布,并在箱梁的底板存在温差现象;温度温梯度荷载在混凝土箱梁的腹板、底板中均有应力产生;观测分析所得的温度梯度荷载与现行规范规定的温度梯度荷载在结构中的分布形式、数值大小及其在桥梁中产生的效应方面差异较大。Choosing the concrete continuous rigid box girder bridge as the research object, the daily variation of temperature gradient in the concrete continuous box girder bridge under the sunshine temperature load was observed by field survey with the thermal imager. The distribution forms and values of maximum vertical rise and minimum fall temperature gradient load were also analyzed. The temperature gradient load effects in the bridge were numerically simulated and analyzed through ANSYS software, and the results were compared with the current Chinese specification. The results show that the distribution forms of vertical rise and fall temperature gradient in the bridge under the sunshine temperature load are both curvilinear. There are temperature differences in the box girder bottom slab and temperature stresses in the webs and bottom slab of box girder under the sunshine temperature load. In the respects of the distribution forms, values and effects of temperature gradient load in structure, there are certain differences between the temperature gradient load of observation and Chinese specification.

关 键 词：混凝土箱形梁 日照温度荷载 温度场测试 温度梯度 温度效应 

分 类 号：U442[建筑科学—桥梁与隧道工程]