考虑火灾全过程的钢管混凝土平面框架受力性能分析

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (11) : 124-129.

论文

考虑火灾全过程的钢管混凝土平面框架受力性能分析

王景玄，王文达

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Analysis on mechanical behavior of planar frame with concrete-filled steel tubular columns after exposure to overall stage fire

WANG Jing-xuan, WANG Wen-da

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摘要

为系统研究钢管混凝土结构的抗火性能，在合理选取钢管与混凝土热力本构模型以及边界条件等基础上，基于ABAQUS软件建立了钢管混凝土柱-组合梁平面框架的热传分析模型和考虑火灾全过程作用的热力耦合数值模型，并与已有试验数据对比验证。在此基础上进行了考虑升降温与外荷载共同作用下框架水平荷载（P）-水平位移（Δ）曲线计算和参数分析，火灾升降温曲线选取ISO-834标准曲线。结果表明：由于火灾作用使得框架的水平极限承载力和初始刚度均有所降低，柱顶轴向压缩量在火灾降温过程中有所减小；柱火灾荷载比、防火保护层厚度以及柱长细比对框架P-Δ曲线形状影响较显著。

Abstract

In order to study systematically the fire resistance of Concrete-Filled Steel Tubular(CFST) structure, this paper presents a Finite Element (FE) model of the planar composite frames with CFST columns and steel and concrete composite beam exposure to overall stage fire based on ABAQUS. The reasonable thermal and material models of steel and concrete were used in the FE model. The FE model was verified by the others’ experimental results. The lateral load (P) versus lateral displacement (Δ) relationships and parametric study of the composite frames were caculated under combined loading and temperature including heating and cooling phases, which followed the ISO-834 standard fire curve. The results show that the ultimate bearing capacity and initial stiffness of the composite frames were reduced due to the high temperature. The axial displacement of columns was decreased during the cooling stage. The fire load ratio of column, depth of fire protection and slenderness ratio of column have significant effects on the load (P) versus displacement (Δ) curves.

导出引用

王景玄;王文达. 考虑火灾全过程的钢管混凝土平面框架受力性能分析[J]. 振动与冲击, 2014, 33(11): 124-129

WANG Jing-xuan;WANG Wen-da. Analysis on mechanical behavior of planar frame with concrete-filled steel tubular columns after exposure to overall stage fire[J]. Journal of Vibration and Shock, 2014, 33(11): 124-129