Fire resistance of concrete-filled steel tube columns with preload. Part II: Numerical and analytical investigation
Fire resistance of concrete-filled steel tube columns with preload. Part II: Numerical and analytical investigation
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预载钢管混凝土柱的耐火性能。
DOI：
10.1016/j.compstruct.2019.110995
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发表时间：
2019-09
影响因子：
6.3
通讯作者：
Jianqiao Ye
中科院分区：
文献类型：
--
作者：
Min Yu;Tan Wang;Weijun Huang;Jianqiao Ye
现浇钢管混凝土（CFST）结构在施工过程中不可避免地要承受钢管内产生的预紧力。这些预载荷可能会对CFST组件（如CFST柱）的整体性能产生不利影响，特别是当柱处于高温下时。然而，现有的钢管混凝土设计方法在耐火设计中排除了预紧力的影响。本文建立了预载钢管混凝土耐火性能的三维有限元预测模型，并进行了试验验证。利用该模型对不同长细比、荷载和预压比的钢管混凝土柱的耐火时间进行了预测。结果表明：钢管预紧力对短钢管混凝土柱的耐火性能影响不大，而当长细比较大时，预紧力对耐火性能的影响较大；当长细比的进一步增大超过一定范围后，预紧力的影响减小。总的来说，钢管混凝土细长柱的耐火性能随着预压比的增加而降低，且预压比越大，预压对钢管混凝土细长柱耐火性能的影响越突出。此外，还提出了预应力现浇钢管混凝土耐火性能的计算公式。本文是Yu等人的合作论文（已提交发表）。
Cast-in-situ concrete-filled steel tube (CFST) structures are inevitably subjected to preload that are developed in the steel tube during the construction process. These preloads may have detrimental effects on the overall performance of a CFST component, such as a CFST column, especially when the column is subjected to elevated temperature. However, existing design methods of CFST exclude the impacts of preload in fire resistance design. In this paper, a three-dimensional finite element model for predicting fire resistance of CFST with preload is developed and validated by experimental tests. The model is then used to predict fire resistance time of CFST columns with different slenderness, load and preload ratios. The results show that preload of the steel tube have little influence on the fire resistance of short CFST columns, while the influence of preload on the fire resistance can be significant when the slenderness ratio is greater. Further increase of the slenderness ratio exceeding a certain range, however, reduces the effect of preload. It can be generally concluded that fire resistance of slender CFST columns decreases with increase of preload ratios and the effect of preload on fire resistance of CFST columns is more prominent when the load ratio is greater. In addition, formulas for calculating fire resistance of cast-in-situ concrete-filled steel tubes (CFST) with preload are proposed. This paper is a companion paper of Yu et al. (submitted for publication).
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预载钢管混凝土柱的耐火性能。
影响因子：
6.3
作者：
Min Yu;Tan Wang;Weijun Huang;Huanxin Yuan;Jianqiao Ye
通讯作者：
Jianqiao Ye
DOI：
10.1016/b978-008044637-0/50101-3
发表时间：
2005
期刊：
--
影响因子：
--
作者：
D. Xiong;X. Zha
通讯作者：
D. Xiong;X. Zha
影响因子：
4.1
作者：
J. Liew;D. Xiong
通讯作者：
J. Liew;D. Xiong
DOI：
10.1142/s0219455410003452
发表时间：
2010-06
影响因子：
3.6
作者：
通讯作者：
--
DOI：
10.1061/40753(171)52
发表时间：
2005-04
期刊：
--
影响因子：
--
作者：
Sangdo Hong;A. Varma
通讯作者：
Sangdo Hong;A. Varma