摘要
为了揭示高温后型钢高强混凝土经历消防喷水冷却和自然冷却后的界面黏结性能差异,以试件的经历最高温度、混凝土强度等级及冷却方式为变化参数,设计并完成了27个试件推出试验。对比分析了自然冷却和喷水冷却两类试件的界面黏结破坏过程和黏结性能指标。结果表明:自然冷却试件初始滑移的发生早于喷水冷却的试件,且其界面整体破坏过程相对更具脆性;自然冷却试件的界面黏结性能明显优于喷水冷却的试件,其界面黏结强度、黏结抗剪刚度及耗能能力平均分别约比喷水冷却的试件高161.6%、347.4%、107.6%;随着经历温度和混凝土强度等级的提高,自然冷却试件的界面黏结强度和耗能能力优势呈现先增大后减小的变化趋势,而其黏结抗剪刚度优势则呈现逐渐增大的变化趋势。
In order to reveal the difference of interface bond behavior of steel reinforced high-strength concrete after high temperature and different cooling methods,27 specimens were designed for push-out test with the variable parameters of maximum temperature,concrete strength and cooling method(natural coolingor water cooling)considered.The interfacial bond failure process and bond behavior indexes of natural cooling and water cooling specimen were compared and analyzed.The results show that the initial slip of the natural cooling specimen is earlier than that of the water cooling specimen,and the interfacial failure process of the natural cooling specimen is relatively more brittle.The bond behavior of the natural cooling specimen is obviously better than that of the water cooling specimen,and its bond strength,bond shear stiffness and energy dissipation capacity are about 161.6%,347.4%and 107.6%higher than those of the water cooling specimen,averagely.With the increase of maximum temperature and concrete strength,the advantage on bond strength and energy dissipation capacity of natural cooling specimen increases at first and then decreases,while the advantage of bond shear stiffness increases gradually.
作者
贾恒瑞
陈宗平
覃龙寿
JIA Hengrui;CHEN Zongping;TAN Longshou(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China;Hualan Engineering Management Co.,Ltd.,Nanning 530004,China)
出处
《混凝土》
CAS
北大核心
2023年第3期42-47,共6页
Concrete
基金
国家自然科学基金(51578163)
广西八桂学者专项研究项目([2019]79号)
广西科技基地与人才专项(桂科AD21075031)。
关键词
高温试验
型钢高强混凝土
推出试验
黏结性能
high temperature test
steel reinforced high strength concrete
push-out test
bond behavior
