砼箱梁内部温度的监测与应力分析  

Internal Temperature Monitoring and Stress Analysis of Concrete Box Girder

作　　者：火东存 薛琳婧 李文娟 HUO Dongcun;XUE Linjing;LI Wenjuan(Shaanxi Railway Institute,Weinan 714000,China;Gansu Institute of Natural Energy,Lanzhou 730070,China)

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714000 [2]甘肃自然能源研究院,甘肃兰州730070

出　　处：《工业加热》2021年第11期39-41,46,共4页Industrial Heating

基　　金：国家自然科学基金资助项目(51808272);陕西铁路工程职业技术学院2020年第二批科研基金项目(KY2020-48)。

摘　　要：砼温度裂缝严重威胁着桥梁运营安全,国内外也在努力积极地研究,但至今尚未形成有效的研究成果。通过对李家沟大桥40 m标准箱梁监测截面各关键点的水化热温度观测数据的统计,明确箱梁早期温度场的分布规律。基于Midas FEA有限元软件建立试验箱梁有限元模型,对其温度场进行模拟分析;不同温差作用下,箱梁内应力主要表现为拉应力,并随温差的增大而增大。根据实测温度场分布规律及应力分析结果,提出了箱梁温度裂缝控制措施。Concrete temperature crack is a serious threat to the safety of bridge operation.Based on the statistics of hydration heat temperature observation data of key points in the 40 m standard box girder section of Lijiagou Bridge,the distribution law of temperature field in the early stage of box girder is clarified.Based on Midas FEA finite element software,the finite element model of test box girder was established and its temperature field was simulated and analyzed.Under the action of different temperature difference,the internal stress of box girder is mainly tensile stress,which increases with the increase of temperature difference.According to the distribution law of measured temperature field and the results of stress analysis,the temperature crack control measures of box girder are put forward.

关 键 词：砼箱梁 水化热 温度试验 有限元分析 

分 类 号：TU398[建筑科学—结构工程]