摘要
对在不同受热温度、不同冷却方式下的钢筋混凝土黏结性能进行了研究.钢筋混凝土黏结试件的受热温度分别为250℃,450℃和650℃,加热方式为黏结面直接受热,冷却方式分为自然冷却和喷水冷却2种.分析了高温后冷却环境对钢筋混凝土极限黏结应力、极限滑移的影响.结果表明,受热温度和冷却方式对高温后钢筋混凝土黏结性能有很大影响,随温度的升高,自冷和水冷黏结试件的极限黏结应力都将逐渐减小,且极限滑移逐渐增大,同时,与自冷试件相比,喷水冷却试件的黏结强度不但有较大幅度的降低,且其滑移量也有明显的减少.最后,给出了高温后钢筋混凝土黏结应力的计算公式.该公式能够用于预估受到不同温度后,在不同冷却方式下钢筋混凝土的黏结强度.
Bond performance in reinforced concrete under various high temperatures and different cooling methods was studied. The surface of the specimen bond part was heated under 250 C, 450 C and 650 C respectively, and the specimen was then cooled in air or by spraying water. Bond strength and the ultimate slip between concrete and steel bar with different heating and cooling histories were studied. Experimental results show that the heating temperature and the cooling method influence bond behavior greatly. With the temperature rising, the bond strength reduces and the ultimate slip increases. Compared with the specimens cooled in air, the bond strength and the ultimate slip of those cooled in water reduce more dramatically. Based on this study, the statistical formula about bond strength was put forward. It can be used to predict bond strength of the specimens heated at different high temperatures and cooled in air or by watering.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2005年第5期605-608,共4页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(50478100)
江苏省博士后科研资助计划项目(B类)
关键词
高温环境
受热温度
冷却方式
黏结性能
high temperatures environment
heated temperature
cooling method
bond behavior
