A general unified method for calculating fire resistance of CFST columns considering various types of steel and concrete
A general unified method for calculating fire resistance of CFST columns considering various types of steel and concrete
复制标题
考虑不同类型钢材和混凝土的钢管混凝土柱耐火计算通用统一方法
DOI：
10.1016/j.jobe.2022.105125
复制
发表时间：
2022-08
影响因子：
6.4
通讯作者：
Shanshan Cheng
中科院分区：
文献类型：
--
作者：
Min Yu;Xuan Hu;Lihua Xu;Shanshan Cheng
由于钢管混凝土结构的优点，其所采用的钢材（如普通/高强/不锈钢等）和混凝土（如普通/高强/超高性能/再生混凝土等），消防安全设计是钢管混凝土结构设计中不可缺少的部分。但目前仍缺乏一种能够同时考虑不同材料及其组合的简单统一的消防设计方法。本文在作者提出的基于平均温度的钢管混凝土耐火统一计算方法的基础上，着力增强统一方法的通用性和准确性，重点关注火灾下材料性能退化效应和截面平均温度的预测。为了预测考虑不同类型钢材和混凝土的材料性能退化效应，提出了全局等效法和分段等效法两种方法，将材料级定义的任意温度折减系数模型转换为钢管混凝土截面级定义的相应等效模型。经过对以往文献中给出的各类钢材和混凝土材料性能折减系数模型的验证，两种方法生成的等效模型能够很好地近似钢管混凝土断面层面的温度诱发退化效应。针对考虑不同类型钢材和混凝土的平均温度预测，提出了一种计算钢管和混凝土核心平均温度的增量计算方法，该方法兼容不同类型钢材和混凝土的各种热特性模型，无需任何中间转换技术。同时，这种增量计算方法对于有保护或无保护的钢管混凝土构件均可采用，也与规范给出的钢结构温度计算公式一致。总之，本文所做的改进可以将先前提出的统一方法的应用范围扩大到各种类型的混凝土材料，从而增强该方法的通用性。
Due to the advantages of CFST structures, various types of steel (e.g., ordinary/high strength/stainless steel, etc.) and concrete (e.g., ordinary/high strength/ultra-high performance/recycled concrete, etc.) are used in them, and fire safety design is an indispensable part in the structural design of CFST. However, there is still a lack of a simple unified fire design method that can consider different materials and their combinations at the same time. Based on the unified calculation method of fire resistance of CFST based on average temperature proposed by the authors, this paper focuses on enhancing the generality and accuracy of the unified method, with specific attention paying to the prediction of material properties degradation effect and cross-sectional average temperature under fire. For the prediction of material properties degradation effect with considering various types of steel and concrete, two methods, namely the global equivalent method and the segmented equivalent method, are proposed to convert arbitrary temperature reduction factor models defined at material level to the corresponding equivalent models defined at CFST section level. After validating with various types of steel and concrete material properties reduction factor models given in the previous literature, it turns out that the equivalent models generated by the two methods can well approximate the temperature-induced degradation effect at CFST section level. As for the prediction of average temperature with considering various types of steel and concrete, an incremental calculation method to calculate the average temperature of steel tube and concrete core is proposed, which is compatible with various thermal property models for different types of steel and concrete without any intermediate conversion techniques. In the meantime, this incremental calculation method can be adopted for CFST members with or without protection and is also consistent with the temperature calculation formulas for steel structures given in Code. In conclusion, the improvements made in this paper can expand the application scope of the previously proposed unified method to various types of concrete materials and thus enhance the generality of the method.
登录
查看更多内容
影响因子：
4.1
作者：
N. Tondini;V. Hoang;J. Demonceau;J. Franssen
通讯作者：
N. Tondini;V. Hoang;J. Demonceau;J. Franssen
高强自密实钢管混凝土短柱的火灾性能
影响因子：
4.1
作者：
Han, Lin-Hai;Lu, Hui;Zhao, Xiao-Ling
通讯作者：
Zhao, Xiao-Ling
影响因子：
4.1
作者：
T. Pires;J. Rodrigues;J. J. R. Silva-J.
通讯作者：
T. Pires;J. Rodrigues;J. J. R. Silva-J.
常温和高温实心和空心钢管混凝土抗弯承载力统一计算公式
影响因子：
4.1
作者：
Yu Min;Pei Xiaoyan;Xu Lihua;Ye Jianqiao
通讯作者：
Ye Jianqiao
影响因子：
11.4
作者：
Khaliq, Wasim;Kodur, Venkatesh
通讯作者：
Kodur, Venkatesh