| 王新,黄磊群,刘丁瑗,莫琳琳,陈宗平.不同冷却方式下高温后圆钢管再生混凝土界面黏结性能对比分析[J].火灾科学,2022,31(2):95-104. |
| 不同冷却方式下高温后圆钢管再生混凝土界面黏结性能对比分析 |
| Comparative analysis of interfacial bond behavior of recycled aggregate concrete filled circular steel tube after exposure to high temperature under different cooling modes |
| |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| DOI：10.3969/j.issn.1004-5309.2022.02.05 |
| 基金项目:国家自然科学基金(51578163);广西科技基地和人才专项(桂科AD21075031);八桂学者专项研究经费项目([2019]79号) |
| 作者 | 单位 | | 王新 | 广西交通职业技术学院,南宁,530004 | | 黄磊群 | 广西路桥集团建筑工程有限公司,南宁,530004 | | 刘丁瑗 | 广西大学土木建筑工程学院,南宁,530004 | | 莫琳琳 | 广西大学土木建筑工程学院,南宁,530004 | | 陈宗平* | 广西大学土木建筑工程学院,南宁,530004 |
|
| 中文关键词: 冷却方式 高温后 圆钢管再生混凝土 黏结性能 对比分析 |
| 英文关键词:Cooling modes After exposure to high temperature Recycled aggregate concrete filled circular steel tube Bond behavior Comparative analysis |
| 摘要点击次数: 138 |
| 全文下载次数: 662 |
| 中文摘要: |
| 为研究自然冷却(自冷)和喷水冷却(水冷)两种方式对高温后圆钢管再生混凝土界面黏结性能的影响差异,以冷却方式、历经最高温度(T)和再生粗骨料取代率(r)为变化参数,设计并完成了21个试件的静力推出试验,观察了试件的破坏过程及形态,获得了荷载-滑移曲线,对比分析了不同冷却方式对高温后圆钢管再生混凝土短柱物理特征、界面破坏过程及黏结性能指标的影响。结果表明:与自冷试件相比,水冷试件的质量烧失率明显减小、初始滑移发生更晚,且在荷载-滑移曲线下降段中,水冷试件表现得更平缓。在自冷方式下,随着历经最高温度的增大,试件的界面黏结强度先减小后增大,但在水冷方式下,界面黏结强度先增大后减小;与自冷试件相比,T超过400 ℃后水冷试件的界面黏结刚度开始退化,在600 ℃时界面黏结刚度退化较大;无论是自冷还是水冷,随着历经最高温度的增大,界面黏结耗能系数不断减小。 |
| 英文摘要: |
| To study the effects of natural cooling and water spray cooling on the interfacial bond behavior of recycled aggregate concrete filled circular steel tube after exposure to high temperature (T), the static push-out tests of 21 specimens with varying parameters of cooling modes, experienced maximum temperature, the replacement rate of recycled coarse aggregate were designed and conducted. The failure process and modes of specimens were observed, and the load-slip curves of specimens were obtained. The effects of different cooling modes on the physical characteristics, interface failure process, and bonding performance index of recycled aggregate concrete filled circular steel tube after exposure to high temperature were compared and analyzed. The test result shows that the ignition loss rate of specimens on water spray cooling was significantly lower than that of natural cooling, and the initial slip of specimens on water spray cooling was later than that of natural cooling. And the load drop at post-peak of specimens on water spray cooling was more gentle than that of natural cooling. In the natural cooling mode, with the increase of the experienced maximum temperature, the interfacial bonding strength first decreased and then increased, but in the water spray cooling mode, the interfacial bonding strength first increased and then decreased. In addition, when T≥400 ℃, compared with natural cooling, the interfacial bonding stiffness of specimens on water spray cooling began to decline, and decreased significantly at 600 ℃. Besides, whether natural cooling or water spray cooling, with the increase of experienced maximum temperature, the energy dissipation coefficient of interfacial bonding decreased. |
| 关闭 |
|
|
|
