力与碳化侵蚀耦合作用下TRC叠合梁的正截面受弯承载力退化研究
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摘要
为研究TRC-SIP-F及其现浇混凝土叠合梁在应力和碳化共同作用下的力学性能以及弯曲应力作用下叠合梁不同部位的碳化深度.利用织物增强混凝土(TRC)预制永久性模板制作叠合梁构件,采用加速碳化试验方法,进行承载力试验,分析2根普通RC梁和5根TRC叠合梁在碳化侵蚀作用下不同应力水平对TRC叠合梁受弯性能的影响.结果表明:碳化侵蚀后TRC叠合梁的力学性能退化情况优于普通RC梁,碳化侵蚀后的TRC叠合梁相比未碳化叠合梁承载力有所提高,但延性有所下降.结合试验数据分析碳化弯曲应力影响系数,得出碳化弯曲应力影响系数和应力水平、测点位置的多项式关系;推导TRC叠合梁碳化侵蚀后承载力计算公式,理论计算结果和试验结果吻合情况良好.
The purpose of this paper is to study the mechanical properties of TRC-SIP-F and its cast-in-place concrete composite beams under the coupling of stress and carbonation erosion, and to study the carbonation depth in different parts of composite beams under bending stress. Prefabricated textile reinforced concrete(TRC) permanent formwork is used to make composite beams. The method of accelerated carbonization is adopted and the bearing capacity test is carried out to analyze mechanical properties of two common RC beams and five TRC composite beams in carbonation corrosion under different stress levels. The results indicate that the degradation of mechanical properties of TRC composite beams after carbonization is better than that of ordinary RC beams, and the bearing capacity of the TRC composite beams is higher than that of the conventional ones, but the ductility decreases. Combined with experimental data, the bending stress coefficient is analyzed, then the polynomial relation between the influence factor of the bending stress and the stress level and the location of the measuring point is obtained. The formula for calculating the bearing capacity of TRC composite beams after carbonization is deduced. The calculated results are in good agreement with the experimental results.
The purpose of this paper is to study the mechanical properties of TRC-SIP-F and its cast-in-place concrete composite beams under the coupling of stress and carbonation erosion, and to study the carbonation depth in different parts of composite beams under bending stress. Prefabricated textile reinforced concrete(TRC) permanent formwork is used to make composite beams. The method of accelerated carbonization is adopted and the bearing capacity test is carried out to analyze mechanical properties of two common RC beams and five TRC composite beams in carbonation corrosion under different stress levels. The results indicate that the degradation of mechanical properties of TRC composite beams after carbonization is better than that of ordinary RC beams, and the bearing capacity of the TRC composite beams is higher than that of the conventional ones, but the ductility decreases. Combined with experimental data, the bending stress coefficient is analyzed, then the polynomial relation between the influence factor of the bending stress and the stress level and the location of the measuring point is obtained. The formula for calculating the bearing capacity of TRC composite beams after carbonization is deduced. The calculated results are in good agreement with the experimental results.
引文
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[4]HEGGER J,VOSS S.Investigation on the bearing behavior and application of textile reinforced concrete[J].Engineering Structures,2008,30(5):2050-2056.DOI:10.1016/j.engstruct.2008.01.006.
[5]荀勇,支正东,张勤.织物增强混凝土薄板加固钢筋混凝土梁受弯性能试验研究[J].建筑结构学报,2010,31(3):70-76.DOI:10.13204/j.gyjz201501035.XUN Yong,ZHI Zhengdong,ZHANG Qin.Experimental research on flexural behavior of reinforced concrete beams strengthened with textile reinforced concrete sheets[J].Journal of Building Structures,2010,31(3):70-76.DOI:10.13204/j.gyjz201501035.(in Chinese)
[6]徐世烺,尹世平,蔡新华.纤维编织网增强混凝土加固钢筋混凝土受弯梁的抗裂性能研究[J].水利学报,2010(7):833-840.XU Shiliang,YIN Shiping,CAI Xinhua.Study on crack resistance of reinforced concrete flexural beams strengthened with fiber reinforced concrete[J].Journal of Water Conservancy,2010(7):833-840.(in Chinese)
[7]张勤.织物增强混凝土(TRC)加固RC梁正截面抗弯性能试验研究[D].镇江:江苏大学,2009.
[8]马剑,江飞飞,吴春杨,等.非连续级配再生自密实混凝土梁受弯性能分析[J].江苏科技大学学报(自然科学版),2017,31(2):241-246.DOI:10.3969/j.issn.1673-4807.2017.02.022.MA Jian,JIANG Feifei,WU Chunyang,et al.Bending performance of reinforced concretebeams made of non-continuous graded recycled self-compacting concrete[J].Journal of Jiangsu University of Science and Technology(Natural Science Edition),2017,31(2):241-246.DOI:10.3969/j.issn.1673-4807.2017.02.022.(in Chinese)
[9]姚振纲,刘祖华,建筑结构试验[M].上海:同济大学出版社,1996:95-102.
[10]牛建刚,牛荻涛,刘万里.弯曲荷载影响粉煤灰混凝土碳化规律的研究[J].硅酸盐通报,2011,30(1):140-146.NIU Jiangang,NIU Ditao,LIU Wanli.Research on carbonation rule of fly ash concrete influenced by bending load[J].Bulletin of the Chinese Ceramic Society,2011,30(1):140-146.(in Chinese)
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