太阳辐射下矩形渡槽热力耦合特性分析  

Analysis of Thermal Coupling Characteristics of Rectangular Aqueduct Under Solar Radiation

作　　者：屈春来[1,2] 吴照正 程方 Chun-lai;WU Zhao-zheng;CHENG Fang(School of Water Conservancy and Hydroelectric Power,Hebei University of Engineering,Handan 056038,China;Hebei Key Laboratory of Intelligent Water Conservancy,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]河北工程大学水利水电学院,河北邯郸056038 [2]河北工程大学河北省智慧水利重点实验室,河北邯郸056038

出　　处：《水电能源科学》2022年第7期159-162,145,共5页Water Resources and Power

基　　金：河北省自然科学基金项目(E2021402023);河北省高等学校科学技术研究项目资助(BJ2019023)。

摘　　要：南水北调工程的输水渡槽总体上呈南北走向,由于渡槽结构温度场变化滞后于太阳辐射能量变化,引起渡槽在温度场和应力场耦合作用下产生非对称应力应变场,为探明太阳辐射能量变化对渡槽结构的影响,采用红外热成像仪现场测试1 d内不同时刻太阳辐射下矩形渡槽的东腹板、西腹板、底板三个不同位置处温度变化情况,并据此采用COMSOL软件建立矩形渡槽热力耦合数值模型,系统分析了太阳辐射作用下渡槽结构温度场、应力场、变形场变化规律。结果表明,太阳辐射作用下渡槽结构向阳面和背阳面温差较大,同一位置处混凝土内外温差较大;渡槽在自重应力作用下,应力集中区域在支墩处,其应力为9.01 MPa,此时渡槽中间段位移较大,变形量为3.15 mm;在热力耦合作用下,15:00的应力达到最大,为10.67 MPa,且渡槽结构在上端变形量达到最大,为1.34 mm。The aqueduct of the South-to-North Water Transfer project has a north-south direction in general. As the variation of temperature field of the aqueduct structure lags behind the variation of solar radiation energy, the asymmetric stress-strain field of the aqueduct is generated under the coupling action of temperature field and stress field. To explore the impact rule of solar radiation energy change on the aqueduct structure, the infrared thermal imager was used to detect temperature changes of the east web, west web and bottom board of rectangular aqueduct under different moment solar radiation in one day. The COMSOL software was adopted to establish the rectangle aqueduct thermal coupling numerical model for analysis of the variation regularity of temperature field, stress field and deformation field of aqueduct structure under action of solar radiation. The results show that under the action of solar radiation, the temperature difference between the sunward side and the night side of the aqueduct structure is large, and the temperature difference between the inside and outside of the concrete at the same position is large. Under the action of dead weight stress, the stress concentration area is at the pier, and the stress is 9.01 MPa. At this time, the displacement of the middle section of the aqueduct is large, and the deformation is 3.15 mm. Under the action of thermodynamic coupling, the maximum stress is 10.67 MPa at clock 15:00, and the maximum deformation is 1.34 mm at the upper end of the aqueduct structure.

关 键 词：矩形渡槽 太阳辐射 红外检测 温度场 热力耦合模型 

分 类 号：TV672.3[水利工程—水利水电工程]