基于准平面假定的内嵌CFRP筋加固宽缺口混凝土梁刚度研究
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摘要
宽缺口混凝土梁是为研究CFRP筋与混凝土界面特性而构造的一种新型混凝土梁,为分析该新型梁加固后的变形与刚度特性,在完成了16根内嵌CFRP筋加固各类混凝土梁静载试验,并详细量测和研究其变形刚度的基础上,基于FRP类材料加固混凝土梁应变协调的准平面假定,根据传统的钢筋混凝土刚度研究理论,在充分考量CFRP筋的刚度贡献的前提下,对内嵌CFRP筋加固的宽缺口混凝土梁的刚度的计算公式进行了理论推导,并将理论公式的计算结果与实测结果进行了比对。研究结果表明:与对比梁相比,内嵌CFRP筋材加固的宽缺口混凝土梁和内嵌CFRP筋加固的普通混凝土梁的刚度有小幅度提高,内嵌的CFRP筋能有效延缓裂缝的发展,减小混凝土梁变形。
The wide gap concrete beam is a new type of concrete beam to study the characteristics of CFRP and concrete interface. A total of 16 embedded CFRP bars were completed to reinforce each type of concrete beam static load test in order to analyze the deformation and stiffness characteristics of the new beam and the deformation stiffness is measured and studied in detail. According to the traditional theory of reinforced concrete stiffness and on the premise of fully considering the stiffness contribution of CFRP bars,the theoretical derivation of the calculation formula of the stiffness of a wide gap concrete beam with embedded CFRP reinforcement is presented based on the quasi-plane assumption of strain coordination of reinforced concrete beams strengthened with FRP class materials and the calculation results of the theoretical formula are compared with the measured results. Compared to the comparison beam,the results show that the stiffness of common concrete beams reinforced with CFRP reinforced concrete beams and embedded CFRP bars has a small increase,and the embedded CFRP bars can effectively delay the development of cracks and reduce the deformation of concrete beams.
The wide gap concrete beam is a new type of concrete beam to study the characteristics of CFRP and concrete interface. A total of 16 embedded CFRP bars were completed to reinforce each type of concrete beam static load test in order to analyze the deformation and stiffness characteristics of the new beam and the deformation stiffness is measured and studied in detail. According to the traditional theory of reinforced concrete stiffness and on the premise of fully considering the stiffness contribution of CFRP bars,the theoretical derivation of the calculation formula of the stiffness of a wide gap concrete beam with embedded CFRP reinforcement is presented based on the quasi-plane assumption of strain coordination of reinforced concrete beams strengthened with FRP class materials and the calculation results of the theoretical formula are compared with the measured results. Compared to the comparison beam,the results show that the stiffness of common concrete beams reinforced with CFRP reinforced concrete beams and embedded CFRP bars has a small increase,and the embedded CFRP bars can effectively delay the development of cracks and reduce the deformation of concrete beams.
引文
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[13] GB50010-2010,混凝土结构设计规范[S],2010.GB50010-2010,Code for Design of Concrete Structures[S],2010.(in Chinese)
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[2]曹国辉,邓洁. FRP片材加固钢筋混凝土梁变形性能研究[J].工程设计与建设,2005,37(1):18-21.CAO Guohui,DENG Jie. Study on deformation performance of reinforced concrete beams strengthened with FRP laminates[J]. Journal of Engineering Design and Construction,2005,37(1):18-21.(in Chinese)
[3]华明. CFRP加固矩形截面钢筋混凝土梁刚度、裂缝研究[D].东南大学,2006.HUA Ming. Flexural Stiffness and Crack Widths of Rectanglar Reinforced Concrete EAMS Strengthened with Externally Bonded CFRP Sheets[D].Southeast University,2006.(in Chinese)
[4]司马玉洲,朱宏平,张建文.预应力FRP加固混凝土梁的变形性能研究[J].华中科技大学学报(城市科学版),2008,25(3):226-229+233.SIMA Yuzhou,ZHU Hongping,ZHANG Jianwen. Study on the ductility of RC beams strengthened with prestressed FRP sheets[J]. Journal of HUST,(Urban Science Edition),2008,25(3):226-229+233.(in Chinese)
[5]汝海峰,张茜,梁春祥. CFRP加固钢筋混凝土梁疲劳刚度的试验研究[J].铁道工程学报,2008(6):52-55.RU Haifeng,ZHANG Qian,LIANG Chunxiang. Experimental research on the fatigue rigidity of RC beams reinforced by FRP sheets[J]. Journal of Railway Engineering Society,2008(6):52-55.(in Chinese)
[6]丁亚红,张美香,孙博.等.内嵌预应力螺旋肋钢丝加固混凝土梁变形特性研究[J].铁道学报,2012,34(10):97-102.DING Yahong,ZHANG Meixiang,SUN Bo,et al. Research on deformation of reinforced concrete beam embedded with prestressed helical rib steel wires[J]Journal of the China Railway Society,2012,34(10):97-102.(in Chinese)
[7]丁亚红,刘丽娜.表层内嵌预应力螺旋肋钢丝加固混凝土梁变形性能理论分析[J].工程力学,2013,30(4):191-197.DING Yahong,LIU Lina. Study on deformability of concrete beams strengthened with prestressed mounted helical rib steel wire near surface[J].Journal of Engineering Mechanics,2013,30(4):191-197.(in Chinese)
[8] REN Zhenhua,ZENG Xiantao. The strain coordination of quasi-plane-hypothesis for reinforced concrete beam strengthened by epoxy-bonded glass fiber reinforced plastic plate[J]. Journal of Harbin Institute of Technology,2006,13(4):391-394.
[9] REN Zhenhua,Zengxiantao,etal. The double linear strain distribution assumption of RC beam strengthened with external-bonded or near-surface mounted fiber reinforced plastic[J]. Journal of Central South University,2012(19):3582-3594.
[10] REN Zhenhua,Zengxiantao,et al. Quasi-plane-hypothesis of strain coordination for RC beam seismically strengthened with external-bonded or near-surface mounted fiber reinforced plastic[J]. Earthquake Engineering and Engineering Vibration,2013(12):67-76.
[11]任振华.碳纤维增强材料加固π型混凝土梁应变协调关系及界面特性研究[D]:南京:河海大学,2012.REN Zhenhua. Research on Relationship of Strain Coordination and Interface Properties forπRC Beam Strengthened with Carbon Fiber Reinforced Plastic[D]. Nanjing:Hohai University,2012.(in Chinese)
[12]任振华,曾宪桃.碳纤维材料加固π型混凝土梁抗弯试验研究[J].自然灾害学报,2013,22(3):221-228.REN Zhenhua,ZENG Xiantao. Test research on bending capacity ofπ-type concrete beam strengthened with carbon fiber reinforced plastic[J].Journal of Natural Disasters,2013,22(3):221-228.(in Chinese)
[13] GB50010-2010,混凝土结构设计规范[S],2010.GB50010-2010,Code for Design of Concrete Structures[S],2010.(in Chinese)
[14]混凝土结构设计原理(第二版)[M].北京:中国建筑工业出版社,2004.Concrete Structures Design Tenets(The second edition)[M]. Beijing:China Architecture&Building Press,2004.(in Chinese)