火灾后混合配筋混凝土梁抗弯试验研究

田敬博1 朱鹏1 屈文俊1 闫冰1

(1.同济大学建筑工程系, 上海 200092)

【摘要】根据6根试验梁的耐火极限时间和火灾后试验梁的变化情况,选取未破坏的1根钢筋混凝土梁及2根混合配筋混凝土梁进行火灾后的静力加载试验,研究了火灾后钢筋混凝土梁和混合配筋混凝土梁的抗弯能力,讨论了钢筋-GFRP筋配筋比和荷载对混合配筋混凝土梁性能的影响,试验结果表明:1)火灾后混合配筋混凝土梁中GFRP筋的强度损失殆尽,钢筋的力学性能可以有一定程度的恢复,火灾后钢筋混凝土梁的力学性能恢复情况要优于混合配筋混凝土梁。2)纵筋中钢筋与GFRP筋的配筋比是影响混合配筋混凝土梁剩余承载能力的主要因素,钢筋与GFRP筋的配筋比越大,火灾后混合配筋混凝土梁的力学性能恢复越好。基于试验现象和理论分析,建议了火灾后混合配筋混凝土梁剩余抗弯能力计算方法,计算结果与试验结果吻合较好,可以用于工程计算。

【关键词】 混合配筋混凝土梁; 火灾后静力加载试验; 钢筋-GFRP筋配筋比; 剩余抗弯承载力;

【DOI】

【基金资助】 国家自然科学基金项目(51678430) National Natural Science Foundation of China(51678430) 国家重点研发计划项目(2017YFC0703003) National Key Research and Development Program of China(2017YFC0703003)

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    References

    [1] Pang,L.,Qu,W. J.,Zhu,P.,et al. Design propositions for hybrid FRP-steel reinforced concrete beams[J]. Journal of Composites for Construction,2015,20(4):04015086.

    [2]LIU Wenchao,CAO Wanlin,ZHANG Jianwei,et al. Experimental study on axial compression behavior of recycled concrete-filled steel tubular columns after fire exposure[J]. Journal of Natural Disasters,2017,26(5):45-50.(in Chinese)

    [3]CHEN Shicai,REN Aizhu,LU Xinzheng. Numerical analysis and simulation of space concrete frames under fire[J]. Journal of Natural Disasters,2007,16(6):88-92.(in Chinese)

    [4] Abrams M S. Compressive strength of concrete at temperatures to 1600F[J]. Special Publication,1971,25:33-58.

    [5] Hsu J H,Lin C S. Residual bearing capabilities of fire-exposed reinforced concrete beams[J]. International Journal of Applied Science&Engineering,2006,4(2):151-163.

    [6] El-Hawary M M,Ragab A M,El-Azim A A,et al. Effect of fire on shear behaviour of R. C. beams[J]. Computers&Structures,1997,65(2):281-287.

    [7] El-Hawary M M,Ragab A M,El-Azim A A,et al. Effect of fire on flexural behaviour of R. C. beams[J]. Construction&Building Materials,1996,10(2):147-150.

    [8] Jiangtao Yu,Zhaoudao Lu,Kai X. Experimental study on the performance of RC continuous members in bending after exposure to fire[J]. Procedia Engineering,2011,14:821-829.

    [9] BCI. Assessment and Repair of Fire-Damaged Concrete Structures[R]. Technical Report No. 33. London:The British Concrete Institute,1990.

    [10] Short N R,Purkiss J A,Guise S E. Assessment of fire damaged concrete using colour image analysis[J]. Construction&Building Materials,2001,15(1):9-15.

    [11] Chew M Y L. The assessment of fire damaged concrete[J]. Building&Environment,1993,28(1):97-102.

    [12] Chew M Y L. Effect of heat exposure duration on the thermoluminescence of concrete[J]. Aci Materials Journal,1993,45(163):131-138.

    [13]LU Zhoudao,LIAO Jiehong,YU Jiangtao. Study and discussion on inspection of fire-damaged concrete structures[J]. Journal of Disaster Prevention and Mitigation Engineering,2012,32(S1):36-39.(in Chinese)

    [14] Dorsch D F. Assessment and Repair of Fire-Damaged Concrete Structures[C]. Innovation in Repair Techniques of Concrete Structures,2015.

    [15]ZHOU Changdong,LV Xilin,JIN Ye. Fire-resistance design on concrete structures reinforced with GFRP bars[J]. Journal of Building Materials,2009,12(1):32-35.(in Chinese)

    [16]ZHOU Changdong,LV Xilin,JIN Ye. Research on mechanical behavior of GFRP bars in high temperature[J]. Journal of Architecture and Civil Engineering,2006,23(1):23-28.(in Chinese)

    [17]ZHOU Changdong. The Fire Resistance of Concrete Structures Reinforced with GFRP Bars[D]. Shanghai:Tongji University,2005.(in Chinese)

    [18] ISO-834,Fire resistance tests,Elements of building construction. International Standards Organisation,Geneva; 1975.

    [19]GB 50010-2010 Code for Design of Concrete Structures[S]. Beijing:China Architecture&Building Press,2010.(in Chinese)

    [20] ASTM E119. Standard Test Methods for Fire Tests of Building Construction and Materials[S]. ASTM International. 2014.

    [21]WANG Shouqian. Fire Protection of Building[M]. Beijing:China Architecture&Building Press,2000.(in Chinese)

    [22]WU Bo. The Mechanical Property of Reinforced Concrete Beams after Fire[M]. Beijing:Science Press,2003.(in Chinese)

    [23]GUO Zhenhai,SHI Xudong. Reinforced Concrete Theory and Analyse[M]. Tsinghua University Press,2003.(in Chinese)

    [24]CHEN Zongping,ZHOU Shanwei,LIANG Houran. Shear behavior test and bearing capacity calculation of recycled aggregate concrete beam after high temperature[J]. Journal of Natural Disasters,2018,27(5):138-150.(in Chinese)

This Article

ISSN:1004-4574

CN: 23-1324/X

Vol 28, No. 04, Pages 22-31

August 2019

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Article Outline

摘要

  • 1 火灾试验
  • 2 火灾后静力加载试验数据整理和分析
  • 3 火灾后截面抗弯能力的计算
  • 4 结论
  • 参考文献