主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2021, Vol. 40 ›› Issue (1): 57-63.

• • 上一篇    下一篇

火灾下钢筋混凝土剪力墙温度场数值模拟

魏晓颖，赵军，边会婷，梁天水   

  1. 郑州大学力学与安全工程学院，河南郑州450001
  • 出版日期:2021-01-15 发布日期:2021-01-15
  • 通讯作者: 赵军(1971-)，男，河南郑州人，郑州大学力学与安全工程学院教授，河南省郑州市高新区科学大道100 号，450001。
  • 作者简介:魏晓颖(1995-)，女，河南商丘人，郑州大学力学与安全工程学院硕士，主要从事工程材料与结构的力学特性及其应用研究，河南省郑州市高新区科学大道100号，450001。
  • 基金资助:
    教育部长江学者和创新团队发展计划项目（IRT＿16R67）

Numerical simulation on temperature field of reinforced concrete shear wall under fire

WEI Xiao-ying, ZHAO Jun, BIAN Hui-ting, LIANG Tian-shui   

  1. School of Mechanics and Safety Engineering, Zhengzhou University, Henan Zhengzhou 450001, China
  • Online:2021-01-15 Published:2021-01-15

摘要： 为了研究配筋率、升温曲线、多面受火、传热系数等因素对钢筋混凝土剪力墙温度场的影响，利用COMSOL 多物理场建模与仿真软件对火灾下钢筋混凝土剪力墙温度场进行模拟，并得到不同因素变化条件下的剪力墙的温度场分布规律，模拟结果与试验结果符合良好。对温度场模拟中各参数对温度场的影响进行了讨论，结果表明：受火时间越长，钢筋混凝土剪力墙的温度越高；相比于配筋率和骨料类型，不同升温速率对钢筋混凝土剪力墙的温度场的影响更为显著，且钢筋混凝土剪力墙边缘处的钢筋对其温度场也有明显的影响。此外，单面和三面受火的钢筋混凝土剪力墙的核心区温度值较为接近，双面和四面受火的钢筋混凝土剪力墙的核心温度较为接近；受火面的传热系数中对流传热系数和综合辐射系数对传热的影响显著，当温度大于一定程度时，辐射系数大于0.7 时，对流传热系数对传热的影响可以忽略不计。

关键词: 钢筋混凝土, 剪力墙, 温度场, 数值模拟

Abstract: In order to study the influence of reinforcement ratio, temperature curve, surface by the fire and the heat transfer coefficient on the reinforced concrete shear wall temperature field, by the more physical fields modeling and simulation software COMSOL, the temperature field of reinforced concrete shear walls under fire was simulated. The temperature field of shear wall under different factors was obtained and the results were in good agreement with the test results. The influence of various parameters on the temperature field was discussed. The results showed that the longer the fire duration, the higher the temperature of reinforced concrete shear wall. Compared with reinforcement ratio and aggregate type, the influence of different heating rates on the temperature field of reinforced concrete shear wall is more significant. The concrete reinforcing bars at the edge of reinforced concrete shear wall also has obvious influence on its temperature field. In addition, the temperature values of the core areas of the single- side and three- side fire reinforced concrete shear walls are close, and the core temperatures of the double- side and four- side fire reinforced concrete shear walls are close. In the heat transfer coefficient of the fire surface, the influence of the comparative convection coefficient and the comprehensive radiation coefficient on the heat transfer is significant. When the temperature is greater than a certain degree and the radiation coefficient is greater than 0.7, the influence of the convection coefficient on the heat transfer is negligible.

Key words: reinforced concrete, shear wall, temperature field;numerical simulation