(1 陇东学院土木工程学院， 庆阳 745000；   2 甘肃省高校黄土工程性质及工程应用省级重点实验室， 庆阳 745000；   3 兰州交通大学甘肃省道路桥梁与地下工程重点实验室， 兰州 730070；  4 兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室， 兰州 730070）

［摘要］为了研究温变对大直径圆钢管混凝土构件截面温度场分布的影响，分别在室外环境和人工气候模拟试验箱内进行了温变试验，测得不同温变条件下钢管混凝土试件和素混凝土对照试件的温度场。试验结果表明：钢管混凝土试件和素混凝土对照试件温度场变化规律基本一致，无日照作用时截面温度场呈均匀分布，日照作用下截面温度场呈非均匀分布。两种环境下，试件截面温度场均呈现出从外往内越靠近圆心, 温度变化越滞后的现象，而且试件截面最大温差主要取决于太阳辐射和气温变化幅度。

［关键词］钢管混凝土；   温度场；   温变试验；   试验研究；   日照作用

中图分类号：TU528-79文献标识码：A文章编号：1002-848X(2020)17-0099-05

Experimental research on the temperature field distribution of large diameter circular CFST section

YANG Yang1,2, ZHANG Rongling3,4, QI Qiang3, YANG Hongping1,2

(1 School of Civil Engineering, Longdong University, Qingyang 745000, China; 2 Provincial Key Laboratory of Loess Engineering Properties and Application in Gansu Province Universities, Qingyang 745000, China; 3 Key Laboratory of Road ＆ Bridges and Underground Engineering of Gansu Province， Lanzhou Jiaotong University， Lanzhou 730070， China; 4 National and Provincial Joint Engineering Laboratory of Road ＆ Bridge Disaster Prevention and Control， Lanzhou Jiaotong University， Lanzhou 730070，  China)

Abstract:In order to study the influence of temperature change on the temperature field distribution of large diameter circular concrete filled steel tube (CFST) section, the temperature change test was carried out under the outdoor environment and artificial climate simulated test box, the temperature field of the CFST specimen and the plain concrete control specimen under different temperature change conditions were measured. The test results show that: the change law of the temperature field of the CFST specimen and the plain concrete control specimen is basically the same. The temperature field of the cross section is uniformly distributed without the action of sunshine and the temperature field of the cross section is nonuniform under the sunlight. In both environments, the temperature field of the cross section of the specimen shows a phenomenon that the closer to the center of the circle from the outside to the inside, the more lagging the temperature change is. The maximum temperature difference of the specimen cross section mainly depends on the solar radiation and the range of temperature change.

Keywords:concrete filled steel tube；  temperature field；  temperature change test；  experimental research；  action of sunshine

*甘肃省教育厅高等学校科研项目(2018B-054)，教育部高教司产学合作协同育人项目（201901273045），甘肃省教育科学“十三五”规划2019年课题(GS〔2019〕GHB2065)，陇东学院教育教学研究项目（2019-37）。

作者简介：杨阳，硕士，讲师，Email：1027406080@qq.com。