Suggested Sections for Axially Loaded Concrete Columns in Meeting the Target Fire-resistance Reliability Index

吴波; 冯玮; 文波

doi:10.13409/j.cnki.jdpme.2012.s1.001

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Suggested Sections for Axially Loaded Concrete Columns in Meeting the Target Fire-resistance Reliability Index

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- Suggested Sections for Axially Loaded Concrete Columns in Meeting the Target Fire-resistance Reliability Index
- Vol. 32, Issue S1, Pages: 1-5(2012)
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- DOI：10.13409/j.cnki.jdpme.2012.s1.001
  CLC： U375.3
- Published：2012
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[1]吴波,冯玮,文波.混凝土轴压方柱满足目标抗火可靠指标的建议截面[J].防灾减灾工程学报,2012,32(S1):1-5.

吴波, 冯玮, 文波. Suggested Sections for Axially Loaded Concrete Columns in Meeting the Target Fire-resistance Reliability Index[J]. 2012, 32(S1): 1-5.
[1]吴波,冯玮,文波.混凝土轴压方柱满足目标抗火可靠指标的建议截面[J].防灾减灾工程学报,2012,32(S1):1-5. DOI： 10.13409/j.cnki.jdpme.2012.s1.001.

吴波, 冯玮, 文波. Suggested Sections for Axially Loaded Concrete Columns in Meeting the Target Fire-resistance Reliability Index[J]. 2012, 32(S1): 1-5. DOI： 10.13409/j.cnki.jdpme.2012.s1.001.

摘要

对混凝土轴压柱抗火计算所用荷载比与其常温设计荷载比的换算关系进行了推导和分析

分别针对耐火等级一级和二级情况下的柱耐火极限要求

给出了四面受火轴压方柱满足目标抗火可靠指标的最小截面取值。研究表明:①常温设计荷载比大致为抗火计算所用荷载比的2～5倍

一般混凝土柱可近似取2.5倍;②荷载比小于0.2时

现行规范给出的300mm×300mm截面柱

在抗火可靠指标不小于目标抗火可靠指标的情况下可以满足二级耐火要求;③荷载比和耐火等级是影响轴压柱最小截面取值的主要因素。

Abstract

A conversion relationship between the load ratio used in fire-resistance calculation and that used in structural design at normal temperature is analyzed for axially loaded concrete columns.To meet the target fire-resistance reliability indexes for fire endurances related to Grade 1 and Grade 2 fire resistance ratings

respectively

the minimum sectional dimensions for four-face heated axially loaded concrete columns are proposed.The results show that:（a） the design load ratio at room temperature is about 2

times of that for fire-resistance calculation

and an approximate value of 2.5 is feasible to common concrete columns;（b） in the case that the load ratio is less than 0.2 and the fire-resistance reliability index is not less than

the target index

columns with a section of 300 mm×300 mm given in current code can meet the Grade 2 fire resistance requirement;and（c） load ratio and fire resistance rating are main factors that influence the minimum sectional dimensions of axially loaded concrete columns.

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references

混凝土柱构件可靠性对随机参数的敏感性研究 [J]. 马德云,左勇志,霍达,滕海文. 建筑科学 . 2008(11)

钢筋混凝土轴压柱的抗火可靠性研究 [D]. 冯玮. 华南理工大学 2011

GB 50010-2002. 混凝土结构设计规范 [S]. 2002

结构可靠度分析[M]. 科学出版社 , 张明, 2009

工程结构荷载与可靠度设计原理[M]. 中国建筑工业出版社 , 李国强等编著, 1999

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