高温喷水冷却后方与圆钢管高强混凝土界面黏结性能对比分析

陈宗平; 周济

doi:10.13204/j.gyjzG19121302

高温喷水冷却后方与圆钢管高强混凝土界面黏结性能对比分析

doi: 10.13204/j.gyjzG19121302

陈宗平^1,2,
周济¹

1. 广西大学土木建筑工程学院, 南宁 530004;
2. 广西大学工程防灾与结构安全教育部重点实验室, 南宁 530004

基金项目:

国家自然科学基金项目（51578163）；广西自然科学基金重点项目（2016GXNSFDA380032）；八桂学者专项经费资助项目（[2019]79号）。

详细信息

作者简介:
陈宗平,男,1975年出生,博士,教授。电子信箱:zpchen@gxu.edu.cn

计量
- 文章访问数: 88
- HTML全文浏览量: 8
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2019-12-13
- 网络出版日期: 2021-03-31

COMPARATIVE ANALYSIS ON INTERFACE BOND PERFORMANCE OF HIGH-STRENGTH CONCRETE FILLED SQUARE OR CIRCULAR STEEL TUBE AFTER BEING SUBJECTED TO ELEVATED-TEMPERATURES AND SPRAY COOLING

CHEN Zongping^1,2,
ZHOU Ji¹

1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
2. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China

摘要

摘要: 为研究高温喷水冷却后方与圆钢管高强混凝土界面黏结性能差异，主要考虑历经最高温度、混凝土强度、恒温时长、锚固长度和冷却方式的影响，对方、圆钢管高强混凝土试件（各22个）进行高温冷却后的静力推出试验，观察试件的破坏过程，对比分析方与圆钢管试件的黏结强度、剪切黏结刚度及界面耗能的差异。结果表明：随着历经最高温度的升高，高温喷水冷却后两种截面形式钢管试件的界面黏结性能差异较大，圆钢管试件的各性能指标均优于方钢管试件的；混凝土强度的提高，可以提高钢管与混凝土间的黏结强度；方钢管试件的黏结强度受恒温时长的影响更大，随着恒温时长的增加，两种截面形式的钢管试件的剪切黏结刚度变化规律相反；锚固长度的增加，会造成界面黏结强度降低，其对圆钢管试件剪切黏结刚度和耗能能力的影响更大；与自然冷却试件相比，喷水冷却试件的黏结强度、剪切黏结刚度均较低，耗能能力较高。
- 钢管再生混凝土 /
- 截面形式 /
- 高温 /
- 喷水冷却 /
- 黏结性能
Abstract: In order to study the difference of interface bond performance of recycled concrete filled square and circular steel tube (RCFSST, RCFCST) short column after being subjected to elevated temperatures and spray cooling, 22 RCFSST and 22 RCFCST specimens were designed for push-out test, with the variable parameters of maximum temperature, concrete strength, constant temperature time, anchorage length and cooling mode considered. The mechanical failure pattern of specimens was observed, and the mechanical properties such as bond strength, shear bond stiffness and interface energy dissipation of the specimens were compared and analyzed. The results showed that with the increase of the maximum temperature, the difference of the interface bond performance between the two sections of steel tube subjected to elevated temperatures and spray cooling was large, and the performance indexes of circular specimen were better than those of square specimen. The increase of concrete strength could improve the bond strength between steel tube and concrete. The influence of constant temperature time on the bond strength of square specimen was greater, with the increase of constant temperature time, the change rule of shear bond stiffness of specimens with two cross-section was opposite. With the increase of anchorage length, the interface bond strength would be reduced, which had a greater impact on the shear bond stiffness and energy dissipation capacity of the circular specimens. Compared with the natural cooling specimens, the spray-cooled specimens had lower bond strength and shear bond stiffness, and higher energy dissipation capacity.
- recycled concrete filled steel tube /
- cross-section form /
- high temperature /
- spray cooling /
- bond performance

HTML全文

参考文献(11)

韩林海. 钢管混凝土结构:理论与实践[M]. 3版. 北京:科学出版社, 2016.

康希良,赵鸿铁,薛建阳,等. 钢管混凝土黏结滑移问题综述分析[J]. 西安建筑科技大学学报(自然科学版), 2006, 38(3):321-326.

TAO Z, HAN L H, UY B, et al. Post-Fire Bond Between the Steel Tube and Concrete in Concrete-Filled Steel Tubular Columns[J]. Journal of Constructional Steel Research, 2011, 67(3):484-496.

张春亮. 高温后钢管混凝土的界面黏结性能试验研究[D]. 北京:北方工业大学,2014.

周文祥. 高温后钢与高强混凝土界面黏结滑移性能试验研究[D]. 南宁:广西大学, 2015.

陈宗平, 刘祥, 徐金俊,等. 高温后方钢管高强混凝土界面黏结性能试验研究[J]. 建筑结构学报, 2017, 38(6):133-143.

翟越, 艾晓芹, 邓子辰,等. 受火温度和冷却方式对混凝土抗压强度影响[J]. 湖南大学学报(自然科学版), 2014, 41(11):74-80.

翟越, 邓子辰, 艾晓芹. 冷却方式和高温对混凝土劈裂抗拉强度影响[J]. 工业建筑, 2015,45(7):113-117.

翟越, 王思维, 石蕴美,等. 高温-水冷却对混凝土抗冲击性能影响试验研究[J]. 工业建筑, 2017, 47(7):127-130.

BOTTE W, CASPEELE R. Post-Cooling Properties of Concrete Exposed to Fire[J]. Fire Safety Journal, 2017, 92:142-150.

PENG G F, BIAN S H, GUO Z Q, et al. Effect of Thermal Shock Due to Rapid Cooling on Residual Mechanical Properties of Fiber Concrete Exposed to High Temperatures[J]. Construction & Building Materials, 2008, 22(5):948-955.

施引文献

资源附件(0)

访问统计