混凝土箱形渡槽日照温度效应数值分析  

Numerical Analysis of Temperature Effect of Sunshine on Concrete Box Aqueduct

作　　者：梁飞 LIANG Fei(Shaanxi Provincial Land Engineering Construction Group Co.,Ltd.,Xi an 710075,China)

机构地区：[1]陕西省土地工程建设集团有限责任公司,陕西西安710075

出　　处：《人民珠江》2020年第12期78-82,90,共6页Pearl River

摘　　要：夏季日照作用下渡槽结构表现为内冷外热的状态,研究该工况下混凝土箱形渡槽的内外温差和温度应力对其防裂设计有着重要的意义。通过建立渡槽断面的有限元模型,分析运营期渡槽在太阳辐射和大气温度影响下的温度场和温度应力场,可以得到:日照作用对渡槽结构的外侧面温度影响很明显,渡槽内的水温主要影响内侧面温度,内外表面产生较大的温差,顶板温差值最大为23.4℃,温度差峰值出现的先后为东腹板、顶板、底板和西腹板;温度场随之也产生相应变化,顶板内表面拉应力值最大,其值为3.56 MPa,底板、东腹板和西腹板次之。在渡槽设计时要对日照作用产生的温度应力引起注意,对易裂缝的部位要增加防裂措施。Under the action of summer sunshine,the aqueduct structure is in the state of internal cooling and external heat.It is of great significance to study the temperature difference and temperature stress of concrete box aqueduct under this condition.By establishing the finite element model of the aqueduct section and analyzing the temperature field and temperature stress field of the aqueduct under the influence of solar radiation and atmospheric temperature during the operation period,it can be concluded that:The effect of sunshine on the temperature of the outer surface of aqueduct structure is obvious,and the water temperature in the aqueduct mainly affects the temperature of the inner surface.The temperature difference between the inner and outer surfaces is large.The maximum temperature difference of the top plate is 23.4°C,and the peak temperature difference appear successively in the east web,top plate,bottom plate and west web.In addition,the temperature field also changes accordingly.The tensile stress on the inner surface of the top plate is the largest,which is 3.56 MPa,followed by the bottom plate,the east web and the west web.In the design of aqueduct,attention should be paid to the temperature stress caused by sunshine,and crack prevention measures should be taken to the crack prone parts.

关 键 词：箱形渡槽 有限元 日照温差 温度应力 

分 类 号：TV672.3[水利工程—水利水电工程]