大体积混凝土凝固过程的温度和应力仿真与控制  

Simulation and Control of Temperature and Stress in Consolidation of Large-sized Concrete

作　　者：杨庆生[1] 李春江[1] 弓俊青[2] 

机构地区：[1]北京工业大学 机械工程与应用电子技术学院,北京100022 [2]中冶集团建筑研究总院 国家工业建筑诊断与改造工程技术研究中心,北京100088

出　　处：《北京工业大学学报》2007年第9期948-953,共6页Journal of Beijing University of Technology

基　　金：国家自然科学基金(10272006;30470439);北京市优秀人才专项基金(20041A0501517);国家留学回国基金(13100094)

摘　　要：为了防止施工中混凝土出现温度裂缝,保证结构的整体性和耐久性,必须进行温度和温度应力的控制.基于瞬态温度场和徐变应力有限元法,对混凝土凝固过程的温度场和应力场进行了数值仿真和分析.研究表明,实际混凝土内部的最高温度多数发生在混凝土浇筑的最初3～5d.第7d左右开始出现超强度区域且分布最为广泛,以后超强度的区域逐渐减小且大部分分布在应力集中区域.施工时应主要控制第7d左右的温度和热应力变化,同时关注超强区的分布范围.In order to prevent the cracking of concrete and to ensure the integrity and the durability ot the structure, it is important to control temperature and thermal stress. The finite element method is used for the simulation of the temperature field and thermal stress of large-sized concrete components. It is shown that from the 3rd to the 5th day the concrete reaches the highest temperature. From the 7th day, the domain with high stress appears and it is widely distributed in the stress concentration area. After that time it reduced gradually. Accordingly, the state of the temperature and thermal stress near the 7th day should be critically monitored.

关 键 词：温度应力 大体积混凝土 凝固 

分 类 号：TU375[建筑科学—结构工程]