Analysis of Mechanical Performance of Concrete-filled Square Hollow Section Columns Exposed to Three-surface Fire

肖会霞; 王景玄; 王文达

doi:10.13409/j.cnki.jdpme.2015.01.016

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Analysis of Mechanical Performance of Concrete-filled Square Hollow Section Columns Exposed to Three-surface Fire

更新时间：2025-12-11

- Analysis of Mechanical Performance of Concrete-filled Square Hollow Section Columns Exposed to Three-surface Fire
- Vol. 35, Issue 1, Pages: 100-105(2015)
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.2015.01.016
  CLC： U398.9
- Published：2015
- 稿件说明：
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[1]肖会霞,王景玄,王文达.三面受火的方钢管混凝土柱火灾全过程力学性能分析[J].防灾减灾工程学报,2015,35(01):100-105.

肖会霞, 王景玄, 王文达. Analysis of Mechanical Performance of Concrete-filled Square Hollow Section Columns Exposed to Three-surface Fire[J]. 2015, 35(1): 100-105.
[1]肖会霞,王景玄,王文达.三面受火的方钢管混凝土柱火灾全过程力学性能分析[J].防灾减灾工程学报,2015,35(01):100-105. DOI： 10.13409/j.cnki.jdpme.2015.01.016.

肖会霞, 王景玄, 王文达. Analysis of Mechanical Performance of Concrete-filled Square Hollow Section Columns Exposed to Three-surface Fire[J]. 2015, 35(1): 100-105. DOI： 10.13409/j.cnki.jdpme.2015.01.016.

摘要

为系统研究非均匀受火时钢管混凝土结构的抗火性能

在合理选取不同阶段钢材和混凝土的热力本构模型的前提下

基于ABAQUS有限元平台

建立方形截面钢管混凝土柱三面受火数值模型。对经历常温加载、升温、降温以及火灾后等不同阶段的钢管混凝土柱力学性能进行初步分析

并与已有的试验进行对比验证;同时

分析了升温时间比t0、保护层厚度a、火灾荷载比n及长细比λ等参数对构件受火性能的影响。结果表明

三面受火时

钢管混凝土柱的破坏形式与均匀受火时有明显差异

因为柱截面温度的不均匀分布会使其产生附加偏心距

发生失稳破坏;三面受火后

钢管混凝土柱的极限承载力和延性均有不同程度的降低;长细比及升温时间比对三面受火时的方钢管混凝土柱力学性能影响较为明显

承载力和延性有明显的下降。

Abstract

In order to study systematically the fire resistance of concrete-filled steel tubular（CFST）structure

this paper presents a finite element model of concrete-filled square hollow section columns exposed to three-surface fire based on ABAQUS.The reasonable thermal and material models of steel and core concrete are used in the FE model.The FE model is developed to study the mechanical performance of CFST columns exposed to overall stage fire

including loading at ambient

heating

cooling and post-fire.The FE model is verified by the others′experimental results.The parametric analysis of FE model is performed

such as fire load ratio of column

depth of fire protection

slenderness ratio of column and fire time ratio of column.The results show that the failure modes in non-uniform fire conditions are different from the uniform fire conditions due to the additional eccentricity.The ultimate bearing capacity and initial stiffness of the CFST columns are reduced due to the high temperature.The fire time ratio of column and slenderness ratio of column have significant effects on the mechanical performance of CFST columns exposed to three surface fire.

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references

非均匀火灾作用下方钢管混凝土柱受力机理研究 [J]. 吕学涛,杨华,张素梅. 建筑结构学报 . 2013(03)

基于多尺度建模的钢管混凝土组合框架耐火性能数值模拟 [J]. 王景玄,王文达,周小燕. 工程力学 . 2012(S2)

考虑火灾全过程的钢管混凝土组合框架力学性能初步研究 [J]. 王景玄,张鹏鹏,王文达. 防灾减灾工程学报 . 2012(01)

三面受火的矩形钢管混凝土柱受力机理与耐火极限 [J]. 杨华,刘发起,吕学涛,张素梅. 建筑钢结构进展 . 2011(06)

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