冷却方式对高温后方钢管再生混凝土黏结滑移性能的影响对比  

Influence comparison of cooling methods on the interface bond behavior of recycled concrete filled steel square tube after high temperature

作　　者：王新[1] 黄磊群 徐炜圣 莫琳琳 陈宗平[3] WANG Xin;HUANG Leiqun;XU Weisheng;MO Linlin;CHEN Zongping(Guangxi Vocationaland Technical Collegeof Communications,Nanning 530023,China;Guangxi Road and Bridge Engineering Group Co.,Ltd.,Nanning 530002,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)

机构地区：[1]广西交通职业技术学院,广西南宁530023 [2]广西路桥集团建筑工程有限公司,广西南宁530002 [3]广西大学土木建筑工程学院,广西南宁530004

出　　处：《混凝土》2022年第6期33-39,共7页Concrete

基　　金：国家自然科学基金(51578163);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)。

摘　　要：为研究高温后不同冷却方式下方钢管再生混凝土构件黏结滑移性能的差异,以冷却方式、历经最高温度、再生粗骨料取代率为变化参数,设计并完成了24个高温冷却后方钢管再生混凝土试件的静力推出试验。通过试验观察了试件破坏过程及形态,获取了试件荷载滑移曲线,重点对比分析了不同冷却方式下,方钢管再生混凝土试件的黏结强度、剪切黏结刚度和界面耗能等重要性能指标的差异。研究结果表明,不同冷却方式下方钢管再生混凝土试件的破坏形式相近;消防喷水试件的界面黏结强度、界面剪切黏结刚度和耗能能力平均分别比自然冷却试件低25.7%、16.5%、9.3%;随历经最高温度的升高,紧箍效应使得不同冷却方式试件界面黏结强度和界面剪切黏结刚度均有升高的趋势,耗能能力随历经温度的升高均降低;随粗骨料取代率的提高,自然冷却试件的黏结强度和剪切黏结刚度均减小,消防喷水试件黏结强度减小但剪切黏结刚度先增加后减小,粗骨料取代率对耗能能力影响不大。In order to study the difference of bond slip behavior of recycled concrete filled steel square tube(RCFSST)short column under different cooling methods after elevated-temperatures,the push-out tests of 24 RCFSST specimens were designed and completed with the cooling methods,maximum temperature and replacement rate of recycled coarse aggregate as variable parameters.The mechanical failure pattern of specimens was observed,the load-slip curves were obtained and the mechanical properties such as bond strength,shear bond stiffness and interface energy dissipation under different cooling methods of the specimens were compared and analyzed.The results showed that the failure patterns of RCFSSTwere similar under different cooling methods.The interfacial bond strength,shear bonding stiffness and energy dissipation capacity of water cooling specimens are 25.7%,16.5%and 9.3%lower than those of natural cooling specimens,respectively.With the increase of the maximum temperature,the confinement effect increases the interfacial bond strength and shear bonding stiffness of specimens with different cooling methods.And the energy dissipation capacity of the two specimens decreases with the increase of the maximum temperature.With the increase of coarse aggregate rate,the interfacial bond strength and shear bonding stiffness of natural cooling specimens decrease,and the bonding strength of water cooling specimens decreases,but the shear bonding stiffness first increases and finally decreases.Recycled coarse aggregate rate has little effect on energy dissipation.

关 键 词：冷却方式 高温 方钢管 再生混凝土结构 黏结滑移 

分 类 号：TU528.571[建筑科学—建筑技术科学]