A Comparative Study among Available Design Guidelines for Composite Beams in Fire

陈玲珠; 蒋首超; 李国强; Gianluca Ranzi

doi:10.13409/j.cnki.jdpme.2015.01.012

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A Comparative Study among Available Design Guidelines for Composite Beams in Fire

更新时间：2025-12-11

- A Comparative Study among Available Design Guidelines for Composite Beams in Fire
- Vol. 35, Issue 1, Pages: 69-78(2015)
- 作者机构：
- 作者简介：
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- DOI：10.13409/j.cnki.jdpme.2015.01.012
  CLC： U398.9
- Published：2015
- 稿件说明：
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[1]陈玲珠,蒋首超,李国强,Gianluca Ranzi.不同规范组合梁抗火设计方法的比较和分析[J].防灾减灾工程学报,2015,35(01):69-78.

陈玲珠, 蒋首超, 李国强, et al. A Comparative Study among Available Design Guidelines for Composite Beams in Fire[J]. 2015, 35(1): 69-78.
[1]陈玲珠,蒋首超,李国强,Gianluca Ranzi.不同规范组合梁抗火设计方法的比较和分析[J].防灾减灾工程学报,2015,35(01):69-78. DOI： 10.13409/j.cnki.jdpme.2015.01.012.

陈玲珠, 蒋首超, 李国强, et al. A Comparative Study among Available Design Guidelines for Composite Beams in Fire[J]. 2015, 35(1): 69-78. DOI： 10.13409/j.cnki.jdpme.2015.01.012.

摘要

首先介绍了中国规范、欧洲规范和英国规范中的组合梁抗火设计方法

并通过算例对比了根据各国规范预测的临界温度和耐火极限。对比发现:对于常温下按完全剪力连接设计的组合梁

各国规范计算出的临界温度相差不是很大

其中欧洲规范的计算值最高

而英国规范的计算值最低。对于常温下按部分剪力连接设计的组合梁

以中国规范中承载力法得到的临界温度可能不安全

建议增加对高温下剪力连接件抗剪承载力的验算;而以中国规范中临界温度法得到的临界温度过于保守

建议将中国规范中临界温度法推荐的表格适用范围局限于常温下按完全剪力连接设计的组合梁。

Abstract

In the first part of the paper

the recommendations specified by the Chinese

European and British guidelines are introduced

followed by a number of comparisons of varying degree of shear connection

load ratios and limit temperatures.In the case of beams designed in full shear connection at room temperature

the difference of the limiting temperature calculated with the three codes is not very large

with the limiting temperature value provided by EC4 being the highest and the one from the British code as the lowest.For composite beams designed with partial shear connection at room temperature

the predicted limiting temperature with the moment capacity method in Chinese code is found to be un-conservative

it is recommended to provide suggestions on the check of shear capacity of shear connectors at fire limit state.Also

the predicted limiting temperature with the limiting temperature method in Chinese code is found to be overconservative

the application of this method is suggested to be limited with all the beams designed as full shear connection at room temperature.

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references

考虑结构整体性的组合梁抗火性能研究 [D]. 王银志. 同济大学 2006

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