Fire Design Method for CFRP-Strengthened Reinforced Concrete Beams Protected with Different Coating Materials

董坤; 胡克旭; 王炜浩; 彭东平

doi:10.13409/j.cnki.jdpme.2015.01.002

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Fire Design Method for CFRP-Strengthened Reinforced Concrete Beams Protected with Different Coating Materials

更新时间：2025-12-11

- Fire Design Method for CFRP-Strengthened Reinforced Concrete Beams Protected with Different Coating Materials
- Vol. 35, Issue 1, Pages: 6-10+16(2015)
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- DOI：10.13409/j.cnki.jdpme.2015.01.002
  CLC： U375.1
- Published：2015
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[1]董坤,胡克旭,王炜浩,彭东平.CFRP加固混凝土梁不同防火材料保护设计方法[J].防灾减灾工程学报,2015,35(01):6-10+16.

董坤, 胡克旭, 王炜浩, et al. Fire Design Method for CFRP-Strengthened Reinforced Concrete Beams Protected with Different Coating Materials[J]. 2015, 35(1): 6-10+16.
[1]董坤,胡克旭,王炜浩,彭东平.CFRP加固混凝土梁不同防火材料保护设计方法[J].防灾减灾工程学报,2015,35(01):6-10+16. DOI： 10.13409/j.cnki.jdpme.2015.01.002.

董坤, 胡克旭, 王炜浩, et al. Fire Design Method for CFRP-Strengthened Reinforced Concrete Beams Protected with Different Coating Materials[J]. 2015, 35(1): 6-10+16. DOI： 10.13409/j.cnki.jdpme.2015.01.002.

摘要

碳纤维增强塑料（CFRP）加固钢筋混凝土结构是目前广泛应用的加固方法之一

但由于CFRP加固构件的耐火性能较差

需进行必要的防火保护。在课题组前期进行的不同防火材料保护的CFRP加固混凝土梁耐火性能试验研究基础上

运用ANSYS有限元分析程序

分别对采取厚型防火涂料、超薄型防火涂料和水泥砂浆作防火保护材料的CFRP加固混凝土梁进行了耐火性能计算分析

结果表明

防火保护层厚度、荷载比、跨高比是影响CFRP加固混凝土梁耐火性能的主要因素

而加固量对耐火性能的影响相对较小。在此基础上

以满足一级耐火极限（≥2.0h）要求的梁跨中挠度限值为标准

根据试验研究及有限元参数分析结果

拟合得到不同防火材料在一级耐火极限要求下的防火保护层厚度计算公式

并给出了3种材料防火保护的合理构造措施

为CFRP加固混凝土梁的防火保护提供了设计方法。

Abstract

Externally bonding carbon fiber reinforced Polymer（CFRP）has been widely used to strengthen concrete structure in recent years.However

fire protection is essential considering the poor fire resistance of CFRP-strengthened members.Based on previous fire tests of CFRPstrengthened reinforced concrete（RC）beams protected with different fireproof materials

this paper focuses on numerical study of fire resistance of CFRP-strengthened RC beams with the protection of thick fire coating

ultra-thin fire coating and cement mortar fire coating.A parametric study is conducted to discover the influences of typical factors on the fire resistance of insulated CFRP-strengthened RC beams.The numerical results show that thickness of fire insulation

load level ratio and span-to-height ratio have greater effect than strengthening ratio.Further

on the basis of experimental studies and numerical analysis

this paper presents a regression formula to calculate the thickness of fire insulation under certain fire prevention requirement and proposes a series of reasonable construction measures with different fire insulations

which provide complete fire design methodology for CFRP-strengthened reinforced concrete beams.

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references

火灾下碳纤维布加固钢筋混凝土梁非线性分析 [J]. 高皖扬,胡克旭,陆洲导. 同济大学学报(自然科学版) . 2009(05)

碳纤维布抗弯加固钢筋混凝土梁的耐火极限分析 [J]. 吴波,万志军,王帆. 工程抗震与加固改造 . 2008(02)

碳纤维加固钢筋混凝土梁防火方法试验研究 [J]. 胡克旭,何桂生. 同济大学学报(自然科学版) . 2006(11)

Fire Endurance of Fiber-Reinforced Polymer Strengthened Concrete T-Beams [J] . Williams, Brea,Kodur, Venkatesh,Green, Mark F,Bisby, Luke. ACI Structural Journal . 2008 (1)

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