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[1]张恩,刘召伟,刘朝峰,等.火灾下钢筋混凝土梁热力学性能演化试验及数值研究*[J].中国安全生产科学技术,2024,20(1):133-140.[doi:10.11731/j.issn.1673-193x.2024.01.020]
　ZHANG En,LIU Zhaowei,LIU Chaofeng,et al.Experimental and numerical study on evolution of thermodynamic properties of reinforced concrete beams under fire[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2024,20(1):133-140.[doi:10.11731/j.issn.1673-193x.2024.01.020]
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火灾下钢筋混凝土梁热力学性能演化试验及数值研究*
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
20
期数:
2024年1期
页码:
133-140
栏目:
职业安全卫生管理与技术
出版日期:
2024-01-31

文章信息/Info

Title:
Experimental and numerical study on evolution of thermodynamic properties of reinforced concrete beams under fire
文章编号:
1673-193X(2024)-01-0133-08
作者:
张恩; 刘召伟; 刘朝峰; 王玲; 刘倩倩; 刘才玮
(1.河北工业大学 土木与交通学院，天津 300401;
2.中国路桥工程有限责任公司，北京 100011;
3.青岛理工大学 土木工程学院，山东 青岛 266033)
Author(s):
ZHANG En;  LIU Zhaowei;  LIU Chaofeng;  WANG Ling;  LIU Qianqian;  LIU Caiwei
(1.College of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;
2.China Road and Bridge Engineering Co.,Ltd.,Beijing 100011,China;
3.College of Civil Engineering,Qingdao University of Technology,Qingdao Shandong 266033,China)
关键词:
火灾; 钢筋混凝土梁; 力学性能; 爆裂; 动力测试; 粘结滑移
Keywords:
fire;  reinforced concrete beam;  mechanical property;  spalling;  dynamic test;  bond-slip
分类号:
TU375.1；X947
DOI:
10.11731/j.issn.1673-193x.2024.01.020
文献标志码:
A
摘要:
为研究荷载状态、受火时间等对钢筋混凝土梁热力学性能的影响规律，设计10根T梁分别开展受火试验及静载试验。考虑混凝土高温爆裂、钢筋/混凝土粘结滑移退化等影响，采用Abaqus建立混凝土梁的数值分析模型，并与试验实测和理论计算结果进行对比分析，验证数值分析模型的可行性和合理性。研究结果表明：截面温度，跨中挠度分别随受火时间和荷载比的增大而逐渐升高，基频随受火时间增长呈波动式下降；数值模拟温度与实测温度基本吻合，抗弯承载力的模拟值比试验值稍高，但相对误差均小于10%；模拟频率曲线与实测频率的波动衰减趋势整体较为吻合。研究结果可为混凝土结构火灾损伤评估提供参考。
Abstract:
In order to study the influence of load state and fire exposure time on the thermodynamic properties of reinforced concrete beams,10 T-beams were designed for fire tests and static load tests,respectively.Considering the effects of concrete high-temperature spalling and bond-slip degradation between reinforcement and concrete,a numerical analysis model of concrete beam was established by Abaqus,and the feasibility and rationality of the numerical model were verified by comparison with the test and theoretical calculation results.The results show that the sectional temperature and mid-span deflection increase with the increase of fire exposure time and load ratio respectively.The fundamental frequency presents fluctuating decrease with the increase of fire exposure time.The numerical simulation temperature are in good agreement with those measured in the experiments.The simulated value of flexural capacity is slightly higher than the test value,but the relative error of both is less than 10%.The simulation frequency curve is in good agreement with the wave attenuation trend of measured frequency.The research results can provide reference for fire damage assessment of concrete structures.

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备注/Memo

备注/Memo:
收稿日期： 2023-08-24
* 基金项目： 国家自然科学基金项目（52278472,52178487）；河北省自然科学基金项目(E2022202119)；山东省自然科学基金项目(ZR2021ME228)；天津市交通运输科技项目（2023-13）
作者简介： 张恩，硕士研究生,主要研究方向为混凝土结构抗火及损伤模拟。
通信作者： 刘朝峰，博士，副教授，主要研究方向为结构抗火及损伤评估。
更新日期/Last Update: 2024-02-19