大体积混凝土温度裂缝观测及分析  

Observation and Analysis on Thermal Cracking of Mass Concrete

作　　者：吴红燕[1] 李兴贵[1] 曹学仁[2] 蔡洪卿 

机构地区：[1]河海大学力学与材料学院,江苏南京210098 [2]江苏省水利厅基建处,江苏南京210029 [3]江苏省盐城市水利工程管理处,江苏盐城224000

出　　处：《水利与建筑工程学报》2011年第2期40-43,53,共5页Journal of Water Resources and Architectural Engineering

基　　金：江苏省水利科技重点项目(2008018)

摘　　要：试验结合闸墩混凝土温度裂缝控导研究,进行现场混凝土温度和应变观测。依据观测结果,分析了大体积混凝土早期温度和应变的分布及变化规律,混凝土中心层和表面层应变与温差的变化关系。计算结果表明,由于温度应力大于混凝土实际抗拉强度,导致混凝土产生裂缝。表层混凝土应变实测值与理论计算值结果相近,变化趋势相同。Combined with the research of controlling and conducting the thermal cracking on gate pier concrete,the observation is made for the temperature and strain of concrete on site.Based on the results,the analyses are made here for the distribution and change regularity of early temperature and strain,the process of rising and decreasing of temperature,and the change relationship of the center concrete to surface concrete.The results of calculation show that the thermal stress is more than the tensile strength,which would result in concrete cracking.The measured value of strain on concrete surface layer is close to the theoretical value of calculation,and the change trend is similar.

关 键 词：大体积混凝土 温度 应变 应力 裂缝 

分 类 号：TU37[建筑科学—结构工程]