高温喷水冷却后型钢高强混凝土黏结滑移性能试验及剩余黏结强度评估  

Bond-slip test and residual bond strength evaluation of steel reinforced high strength concrete after high temperature and water cooling

作　　者：许安邦 周济 周星宇 陈宗平[2,3] XU Anbang;ZHOU Ji;ZHOU Xingyu;CHEN Zongping(Guangxi Limited Company of Tourism Development and Purchasing Industry Group,Nanning 530004,China;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)

机构地区：[1]广西旅发置业集团有限公司,广西南宁530004 [2]广西大学土木建筑工程学院,广西南宁530004 [3]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《混凝土》2024年第5期21-30,36,共11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);中央引导地方科技发展资金项目(桂科ZY21195010);广西重点研发计划项目(桂科AB21220012)。

摘　　要：为了研究型钢高强混凝土在不同火灾高温喷水冷却后的黏结滑移性能,设计了19个型钢高强混凝土试件并进行高温喷水冷却后的推出试验。观察试件的外观变化及受力过程中裂缝发展过程及形态,获取各个试件的荷载-滑移全曲线及极限黏结强度、残余黏结强度等特征点参数,分析历经最高温度、混凝土强度等级、恒温时长和型钢锚固长度等变化参数对型钢高强混凝土试件界面黏结强度、黏结剪切刚度、耗能能力的影响规律,提出相应的黏结滑移本构方程和剩余黏结强度评估式。结果表明:随着历经温度的升高,喷水冷却后试件的黏结强度和黏结剪切刚度波动下降,耗能能力却有所提高;随着混凝土强度等级的提高,试件的黏结强度总体上升,黏结剪切刚度波动变化,耗能能力则变化较小;随着历经最高温度的恒温时间的增长,喷水冷却后试件的黏结强度和黏结剪切刚度均变大。历经最高温度对试件的界面黏结剪切刚度和界面耗能能力影响较为显著,并且温度较低的试件,其界面黏结损伤发展较早且较为迅速。基于试验数据,所提的黏结滑移本构方程和黏结强度计算公式其计算值与实测值吻合良好。In order to investigate the behavior of bond slip between shape steel and high strength concrete after high temperature and water cooling,19 steel reinforced high strength concrete specimens were designed for the push out test.The appearance change and crack propagation of the specimen were observed,the load-slip curves with the characteristic point parameters,such as ultimate bond strength and residual bond strength,were gotten.The influence of various parameters on the bond strength bond,bond shear stiffness and energy dissipation capacity was researched.The results show that the bond strength and shear stiffness of specimens decrease,while the energy dissipation capacity increases with the constant temperature increasing.With the strength grade increasing,the bond strength generally increases,the shear stiffness fluctuates and the energy dissipation capacity changes slightly.With the increase of constant temperature duration,the bond strength and shear stiffness of the specimen increase,but the energy dissipation capacity decreases.The constant temperature has a significant influence on the interface shear strength and energy dissipation capacity.Moreover,the interface bond damage of the specimens with low temperature developed earlier and more rapidly.Based on the test data,the bond slip constitutive model of steel reinforced high strength concrete and the evaluation formula of bond strength of steel reinforced high strength concrete is proposed,and the calculated values are in good agreement with the measured values.

关 键 词：高温喷水冷却 型钢高强混凝土 黏结滑移本构关系 剩余黏结强度评估 

分 类 号：TU528.31[建筑科学—建筑技术科学]