| GFRP筋混凝土梁耐火性能的试验研究 |
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| 引用本文： | 查晓雄,王晓璐,谢先义.GFRP筋混凝土梁耐火性能的试验研究[J].防灾减灾工程学报,2012,32(1):50-55. |
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| 作者姓名： | 查晓雄 王晓璐 谢先义 |
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| 作者单位： | 哈尔滨工业大学深圳研究生院,广东深圳,518055 |
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| 基金项目： | 亚热带建筑科学国家重点实验室开放基金，英国皇家协会国际合作项目 |
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| 摘 要： | 进行了4根GFRP筋混凝土简支梁在ISO834标准升温曲线下的火灾实验,试件依据ACI440.1R-06进行截面设计,分别考虑了不同荷载比、保护层厚度、端部锚固方式对梁耐火性能的影响。试验结果表明,GFRP筋混凝土梁在火灾中的裂纹开展深度较传统的钢筋混凝土结构明显偏大。由于GFRP筋横向膨胀大更易造成梁底混凝土的开裂与剥落,建议在满足纵筋锚固性能要求的前提下,尽量减少端部J型锚固筋。GFRP筋在高温下的材料性能衰减严重,合理的设计保护层厚度和限制GFRP筋的使用内力,可使GFRP筋混凝土梁的耐火性能满足实际工程的需要。
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| 关 键 词： | GFRP筋 混凝土梁 耐火性能试验 |
Fire Performance of GFRP Reinforced Concrete Beams |
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| ZHA Xiao-xiong
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WANG Xiao-lu
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XIE Xian-yi.Fire Performance of GFRP Reinforced Concrete Beams[J].Journal of Disaster Prevent and Mitigation Eng,2012,32(1):50-55. |
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| Authors: | ZHA Xiao-xiong WANG Xiao-lu XIE Xian-yi |
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| Affiliation: | (Shenzhen Graduate School,Harbin Institute of Technology,Shenzhen 518055,China) |
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| Abstract: | The fire performances of concrete beams reinforced with GFRP rebar are present in this paper, and four simply supported beams are exposed to fire with ISO 834 standard heating curve.The design of these flexural beams is according to ACI 440.1R-06.The influences of different loading rates,concrete covers and anchorage modes are taken into account.Fire test results indicate that the crack depth of GFRP reinforced beams is deeper than steel reinforced beams,and more slight cracks even accompanied with concrete splitting appear at the bottom of beam due to GFRP rebar’ s larger transverse expansion.It is recommended that the application of J-hooks anchorage in the crowed end should be reduced if there is sufficient bond strength.Although the mechanical behavior of GFRP reinforced concrete beam degradation significant at elevate temperature,proper design of GFRP reinforced concrete members by limiting the minimum concrete cover and service load will meet the practical fire design requirements. |
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| Keywords: | GFRP rebar concrete beam fire performance test |
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