摘要
我国部分地区冬季气候较为寒冷,混凝土长期处于冻融交替的状态,久而久之其结构内部会逐步出现劣化导致建筑物丧失应有的承载能力,对建筑物的安全性和稳定性构成了巨大的威胁。以室内冻融循环试验为基础,利用ABAQUS有限元软件对C50混凝土冻融循环过程进行了数值模拟,分析了温度场、温度应力场以及动弹性模量的变化规律,结果表明:当冻融循环次数达到160次时,混凝土表面输出点的温度应力峰值超过了抗拉强度标准值且通过室内试验和数值模拟得到的动弹性模量损失率也分别达到了55.60%和54.16%,均已满足试验停止标准。室内试验得出的结论可以由数值模拟得到有效论证,说明了有限元软件应用于混凝土冻融循环模拟的可行性。
The winter season in parts of China is relatively cold,therefore the concrete is in a cycle of freezing and thawing process.Over time,the interior of the structure will gradually deteriorate,causing the building to lose its due bearing capacity,which is a huge threat to the safety and stability of the building.Based on the indoor freeze-thaw cycle test,the numerical simulation of the freeze-thaw cycle process of C50 concrete was carried out by using the ABAQUS finite element software,and the changing laws of the temperature field,temperature stress field and dynamic elastic modulus were analyzed,the results show that when the number of freeze-thaw cycles reaches 160,the peak temperature stress at the output point of the concrete surface exceeds the standard value of tensile strength,and the loss rate of dynamic elastic modulus obtained by laboratory test and numerical simulation also reaches 55.60%and 54.16%,respectively,all of which could met the test stop criteria.The conclusions drawn from the laboratory test can be effectively demonstrated by numerical simulation,which shows the feasibility of applying finite element software to the simulation of concrete freeze-thaw cycles.
作者
潘素明
PAN Suming(China Railway 18th Bureau Group Fifth Engineering Co.,Ltd.,Tianjin 300459,China)
出处
《水利与建筑工程学报》
2022年第5期68-74,共7页
Journal of Water Resources and Architectural Engineering
基金
陕西省重点研发计划(2018SF-391)
陕西省住房和城乡建设厅科技计划(2017-K55)
西安市科技局高校人才服务企业项目(2019217214GXRC008CG009-GXYD8.2)。
关键词
冻融循环
数值模拟
混凝土
温度应力
动弹性模量
freeze-thaw cycle
numerical simulation
concrete
finite element
temperature stress
dynamic elastic modulus
