基于有限差分法与Ansys的外墙外保温结构温度场与温度应力分析  

Temperature Field and Thermal Stress Analysis of External Wall Insulation Structure Based on Finite Difference Method and Ansys

作　　者：王申奥 李舒 王佳瑀 WANG Shen’ao;LI Shu;WANG Jiayu(School of Civil Engineering,Anhui Jianzhu University,Hefei 230009,China;Hefei Institute for Public Safety Research,Tsinghua University,Hefei 230601,China)

机构地区：[1]安徽建筑大学土木工程学院,合肥230009 [2]清华大学合肥公共安全研究院,合肥230601

出　　处：《四川轻化工大学学报(自然科学版)》2024年第6期74-82,共9页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：安徽省重点研发计划面上攻关项目(202104a07020016)。

摘　　要：夏热冬冷地区常用的聚苯乙烯泡沫(Expanded Polystyrene, EPS)板外墙外保温系统往往存在耐久性问题,本文通过数值计算和模拟分析,研究了外保温系统在不同环境下的温度场和温度应力分布规律。研究发现,在常见的温度条件下,外墙外保温系统都能很好地阻隔外界的热量,保证室内温度的宜人。但会出现温度应力集中于墙体中间部位、最大位移发生于墙体四周和边角处的现象,易发生板材中间空鼓、膨胀,而四周开裂、脱粘甚至脱落的老化损伤。分析结果表明,外墙外侧的温度每减小10℃,结构的最大温度应力平均下降23.71%,最大位移平均下降23.63%。同时随着季节温度的变化,墙体的应力和位移也会发生变化,最显著的现象就是应力方向和位移方向发生了改变。根据分析结果得出的一系列结论,对于改进外墙外保温系统的材料和施工工艺,以及提高系统的可靠性和安全性具有重要意义。The external wall insulation system using EPS(Expanded Polystyrene)boards,commonly used in regions with hot summers and cold winters,often encounters durability issues.In this article,numerical calculations and simulation analysis are conducted to investigate the temperature field and temperature-induced stress distribution of the external insulation system under different environmental conditions.The research findings indicate that under typical temperature conditions,the external wall insulation system effectively blocks the heat transfer from the external environment,ensuring comfortable indoor temperature.However,it is observed that temperature-induced stresses tend to concentrate in the middle area of the system,with maximum displacement occurring at the edges and corners.This phenomenon may lead to aging damage such as delamination,expansion,cracking,and even detachment of the insulation boards.The analysis results show that for every 10 degrees Celsius decrease in temperature on the outside of the extemal wall,the maximum temperature stress of the structure decreases by 23.71%on average,and the maximum displacement decreases by 23.63%on average.Additionally,with seasonal temperature changes,the stress and displacement of the wall will also change,and the most significant phenomenon is the change of stress direction and displacement direction.Based on the analysis results,a series of conclusions have been drawn,which have important implications for improving the materials and construction techniques of the external wall insulation system,as well as enhancing its reliability and safety.

关 键 词：数值模拟 外墙外保温结构 温度场 温度应力 

分 类 号：TU364[建筑科学—结构工程]