钢筋混凝土板温度场的非线性有限元分析  

Nonlinear Finite Element Analysis for the Temperature Field of Reinforced Concrete Slabs

作　　者：袁广林[1] 李志奇[1] 王勇[1] 董毓利[2] 

机构地区：[1]中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]华侨大学土木工程学院,福建厦门361000

出　　处：《四川大学学报（工程科学版）》2015年第3期44-52,共9页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家青年自然科学基金资助项目(51408594);中国博士后科学基金资助项目(2014M560461);中央高校基本科研业务费专项资金资助项目(2014QNA78);教育部高等学校博士学科点专项科研基金资助项目(20120095110027);国家自然科学基金资助项目(51178143);江苏高校优势学科建设工程资助项目

摘　　要：为能够有效地确定钢筋混凝土板的温度场,基于经典温度场理论,提出水分修正系数以考虑其湿阻作用,编制了混凝土板温度场的非线性有限元程序;利用程序分析水分修正系数对板温度场的影响,对比表明水分修正系数取值2.0时,计算结果与试验结果吻合良好。在工程常用范围内,分析了导热系数、蒸发温度值、混凝土初始密度、对流系数和辐射系数等参数对板温度场的影响规律。结果表明:导热系数是影响板截面温度分布的主要因素,受火面辐射系数和背火面对流系数是次要因素;蒸发温度值对板背火面附近温度平台有重要影响;混凝土初始密度、受火面对流系数和背火面辐射系数对截面温度场的影响较小。In order to determine effectively the temperature field of reinforced concrete slabs,based on the conventional temperature theory,the effect of moisture clog was taken into account by introducing the correction factor of moisture,and the nonlinear finite element program was developed for the temperature of the concrete slabs. The developed program was used to analyze the effect of correction factor on the temperature of the concrete slabs. The comparison showed that the theoretical results are in good agreement with the tests,when the correction factor of moisture is 2. 0. Within the range of engineering application,the effect of parameters including thermal conductivity,evaporating temperature,the emissivity,the initial density of concrete and the convection coefficient on the temperature of the concrete slabs was analyzed. Results showed that the thermal conductivity is the main factor,and the emissivity of exposed surface is the secondary factor as well as the convection coefficient of unexposed surface. The evaporating temperature has an important effect on the temperature plateau of the slab's unexposed surface. The initial density of concrete,the convection coefficient of exposed surface and the emissivity of unexposed surface have less influence on the slab's temperature.

关 键 词：钢筋混凝土 板 有限元 温度场 湿阻 

分 类 号：TU375.2[建筑科学—结构工程]