Reliability Assessment of Reinforced Concrete Slab in Fire based on Different Failure Criteria

Xuhua Lin; Yuli Dong; Yuanyuan Fang; Dashan Zhang

doi:10.13409/j.cnki.jdpme.20211204001

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Reliability Assessment of Reinforced Concrete Slab in Fire based on Different Failure Criteria

更新时间：2025-09-25

- Reliability Assessment of Reinforced Concrete Slab in Fire based on Different Failure Criteria
- Journal of Disaster Prevention and Mitigation Engineering Vol. 42, Issue 2, Pages: 403-410(2022)
- 作者机构：
  
  华侨大学土木工程学院，福建厦门 361021
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.20211204001
  CLC： TU375.2;TU311.41
- Published：28 April 2022
- 稿件说明：
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林旭华,董毓利,房圆圆等.基于不同破坏准则的火灾下钢筋混凝土板可靠性评估[J].防灾减灾工程学报,2022,42(02):403-410.

Lin Xuhua,Dong Yuli,Fang Yuanyuan,et al.Reliability Assessment of Reinforced Concrete Slab in Fire based on Different Failure Criteria[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(02):403-410.
林旭华,董毓利,房圆圆等.基于不同破坏准则的火灾下钢筋混凝土板可靠性评估[J].防灾减灾工程学报,2022,42(02):403-410. DOI： 10.13409/j.cnki.jdpme.20211204001.

Lin Xuhua,Dong Yuli,Fang Yuanyuan,et al.Reliability Assessment of Reinforced Concrete Slab in Fire based on Different Failure Criteria[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(02):403-410. DOI： 10.13409/j.cnki.jdpme.20211204001.

摘要

为探究火灾下钢筋混凝土板的可靠性，计算了基于不同破坏准则下的可靠指标并进行对比评估。提出了一种随机有限元模型，考虑了火灾荷载与混凝土板设计中的多种随机参数，对钢筋混凝土板火灾下的热力学反应开展概率分析。首先，利用ABAQUS有限元软件对混凝土板建立精细化模型，将数值模拟结果与火灾试验数据进行对比验证。接着，利用abaqus@python脚本，结合LHS法抽样处理随机参数并生成随机模型，循环运算得到随机钢筋温度曲线、背火面温度曲线与跨中挠度曲线。最后，基于MATLAB蒙特卡洛法计算得到失效概率与可靠指标。结果表明：提出的随机有限元模型能有效评估火灾下钢筋混凝土板的可靠性；以挠度变形为依据的破坏准则高估了钢筋混凝土板的临界温度；正常设计的钢筋混凝土板耐火极限为90 min的可靠指标为1.88，评估火灾下钢筋混凝土板可靠性时需要考虑火灾发生的频率。

Abstract

To explore the reliability of reinforced concrete slabs in fire， the reliability index based on different damage criteria were calculated， compared and evaluated. A stochastic finite element model was proposed， considering multiple stochastic parameters in fire load and the design of concrete slab. Probability analysis on the thermodynamic reactions of reinforced concrete slab in fire was carried out. First， a refined model of concrete slab was established in ABAQUS finite element software. The numerical simulation results were verified by the fire test data. Then， abaqus@python script was used to sample random parameters with LHS method and generate random model. Random temperature curve of steel， unexposed surface temperature curve of slab and random deflection curve of mid-span were obtained by cyclic calculation. Finally， the failure probability and reliability index were calculated based on MATLAB Monte Carlo method. The results show that the proposed model can be used to evaluate the thermodynamic response of reinforced concrete slab based on reliability theory. The failure criterion based on deflection overestimates the critical temperature of the reinforced concrete slab. The reliability index of normally designed reinforced concrete slab is 1.88 when exposed to fire for 90 min. The frequency of fire should be considered when evaluating the reliability of reinforced concrete slab in fire.

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references

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