Failure Process Analysis of Restrained Steel Columns under Fire:Comparison between Static Analysis and Dynamic Analysis

蒋彬辉; 李国强

doi:10.13409/j.cnki.jdpme.2016.03.013

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Failure Process Analysis of Restrained Steel Columns under Fire:Comparison between Static Analysis and Dynamic Analysis

更新时间：2025-12-11

- Failure Process Analysis of Restrained Steel Columns under Fire:Comparison between Static Analysis and Dynamic Analysis
- Vol. 36, Issue 3, Pages: 405-408(2016)
- 作者机构：
- 作者简介：
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- DOI：10.13409/j.cnki.jdpme.2016.03.013
  CLC： U391;TU352.5
- Published：2016
- 稿件说明：
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[1]蒋彬辉,李国强.约束钢柱火灾下失效过程静力与动力分析对比[J].防灾减灾工程学报,2016,36(03):405-408.

蒋彬辉, 李国强. Failure Process Analysis of Restrained Steel Columns under Fire:Comparison between Static Analysis and Dynamic Analysis[J]. 2016, 36(3): 405-408.
[1]蒋彬辉,李国强.约束钢柱火灾下失效过程静力与动力分析对比[J].防灾减灾工程学报,2016,36(03):405-408. DOI： 10.13409/j.cnki.jdpme.2016.03.013.

蒋彬辉, 李国强. Failure Process Analysis of Restrained Steel Columns under Fire:Comparison between Static Analysis and Dynamic Analysis[J]. 2016, 36(3): 405-408. DOI： 10.13409/j.cnki.jdpme.2016.03.013.

摘要

为研究受约束钢柱在火灾下的失效全过程响应

以及静力分析方法是否依然适用于临界温度之后的响应分析

建立了柱端受轴向和转动约束的钢柱火灾下简化分析模型

考虑两种不同的工况

分别采用静力和动力分析方法对受火钢柱进行了失效全过程分析。结果显示

根据约束刚度大小以及承受荷载大小的不同

受约束钢柱在火灾下的屈曲后响应可能是拟静力的

也可能伴随显著的动力效应。钢柱温度达到临界温度以前

静力分析、拟静力分析与动力分析结果基本一致。钢柱达到临界温度后的响应

若柱后屈曲响应为拟静力过程

则静力分析与动力分析结果基本一致

若柱后屈曲响应存在明显的动力效应

则静力分析会不收敛

拟静力分析得到的最大柱顶竖向位移会小于动力分析的结果。因此对于钢柱后屈曲响应

静力分析、拟静力分析可能导致偏于不安全的抗火设计。

Abstract

To study the whole failure process of restrained steel columns under fire and the applicability of static analysis in post buckling analysis under fire

this paper develops a simplified model of restrained columns under fire considering two cases and analyzes the columns using static and dynamic method respectively.The results show that the column may buckle gradually or suddenly depending on the condition of restraint stiffness and load ratio.And for the behaviour of columns below critical temperature

the differences of results among static analysis

quasi-static analysis and explicit dynamic analysis are negligible.For the post buckling behaviour

if the buckling process is gradual

the results of static analysis and explicit dynamic analysis methods are almost the same;if the buckling process is dynamic

static analysis may be terminated with convergence difficulties and quasi-static analysis may underestimate the largest vertical displacement at column top.Therefore

for the fire design which needs to consider the post buckling behaviour of columns

static analysis and quasi-static analysis may lead to unsafe design.

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references

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