日照下的混凝土箱梁腹板温度场有限元分析  

Finite Element Analysis of Web Temperature Field of Concrete Box Girder under Sunlight

作　　者：王诗迪 谭双全[1] 钟恒[1] Wang Shidi;Tan Shuangquan;Zhong Heng(Chongqing Survey Institute,Chongqing 400020,China)

机构地区：[1]重庆市勘测院,重庆市400020

出　　处：《北方交通》2022年第1期17-20,共4页Northern Communications

摘　　要：建立了重庆某混凝土箱梁桥日照情况下的温度场有限元计算模型。获取了主梁截面整体温度分布的一般规律、腹板某点随时间的变化规律和沿腹板高度的温度分布规律。结果表明:腹板温度随时间呈现周期性波动趋势,日照辐射与对流散热效应存在相互竞争;受翼板遮挡影响,除中午外沿腹板高度方向温度呈现不均匀现象,且腹板高度的增加会加剧该方向的温度梯度。The finite element calculation model of temperature field of a concrete box girder bridge in Chongqing under sunshine is established.The general law of the overall temperature distribution of the main beam section,the variation law of a certain point of the web with time and the temperature distribution law along the height of the web are obtained.The results show that:the web temperature fluctuates periodically with time,and there is a competition between sunshine radiation and convective heat dissipation;the temperature along the web height direction is uneven except at noon under the influence of wing plate shielding,and the increase of web height will aggravate the temperature gradient in this direction.

关 键 词：混凝土箱梁 腹板 日照辐射 温度场 有限元 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]