碳纤维材料加固π型混凝土梁抗弯试验研究
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摘要
通过对27根钢筋混凝土梁的静载试验,研究了不同加固方式、不同嵌贴数量对CFRP材料加固普通混凝土梁及π型混凝土梁的破坏形态、极限承载力及刚度等的影响,研究了被加固(π型)混凝土梁的弯曲特性,比较了表层嵌入法和表层外贴法加固普通混凝土梁和π型混凝土梁的加固效果。结果表明,CFRP材料加固π型混凝土梁的效果稍次于加固普通混凝土梁;无论是普通混凝土梁还是π型混凝土梁,表层嵌入法的加固效果明显优于表层外贴法。
Based on static tests on 27 RC beams,the influence of different strengthening patterns and different number of near-surface mount/external bond reinforcements on the failure mode,ultimate bearing capacity and stiffness of carbon fiber reinforced plastic(CFRP)-strengthened common concrete beams and π-type concrete beams was studied.The flexural behavior of the strengthened concrete beams(π-type concrete beams) was explored and the strengthening effects of near-surface mounted(NSM) method and external bond reinforced(EBR) method on common concrete beams and π-type beams were compared.Results indicate that,the reinforcing effect of π beams is slightly weaker than that of common concrete beams.Despite common concrete beams or π concrete beams,NSM technique has better performance than externally bonded technique.
Based on static tests on 27 RC beams,the influence of different strengthening patterns and different number of near-surface mount/external bond reinforcements on the failure mode,ultimate bearing capacity and stiffness of carbon fiber reinforced plastic(CFRP)-strengthened common concrete beams and π-type concrete beams was studied.The flexural behavior of the strengthened concrete beams(π-type concrete beams) was explored and the strengthening effects of near-surface mounted(NSM) method and external bond reinforced(EBR) method on common concrete beams and π-type beams were compared.Results indicate that,the reinforcing effect of π beams is slightly weaker than that of common concrete beams.Despite common concrete beams or π concrete beams,NSM technique has better performance than externally bonded technique.
引文
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[14]孙治国,王东升,李宏男,等.汶川地震钢筋混凝土框架震害及震后修复建议[J].自然灾害学报,2010,19(4):114-123.SUN Zhiguo,WANG Dongsheng,LI Hongnan,et al.Damage investigation of RC frames in Wenchuan earthquake and suggestions forpost-earthquake rehabilitation[J].Journal of Natural Disasters,2010,19(4):114-123.(in Chinese)
[15]任振华.内嵌CFRP筋-预应力螺旋肋钢筋复合加固混凝土梁抗弯试验研究[D].焦作:河南理工大学,2009.REN Zhenhua.The Flexural Experiment of RC Beams Strengthened with Near-surface Mounted Carbon Fiber Reinforced Plastic-pre-stressedHelical Rib Rebar[D].Jiaozuo:Henan Polytechnic University,2009.(in Chinese)
[2]任振华,曾宪桃,刘汉龙,等.复合内嵌碳纤维筋预应力螺旋肋钢筋加固混凝土梁试验[J].河海大学学报:自然科学版,2012,40(4):370-375.REN Zhenhua,ZENG Xiantao,LIU Hanlong,et al.The experiment of RC beams multiply strengthened with near-surface mounted Carbon fiberreinforced plastic bar and pre-stressed helical rib bar[J].Journal of Hohai University:Natural Sciences,2012,40(4):370-375.(inChinese)
[3]任振华,曾宪桃,周丰峻.复合内嵌碳纤维筋预应力螺旋肋钢筋加固混凝土梁承载力分析[J].玻璃钢/复合材料,2012(5):33-37.REN Zhenhua,ZENG Xiantao,ZHOU Fengjun.Analysis For Bending Capacity of Reforced Concrete Beams Multiple Strengthened WithNear-Surface Mounted carbon Fiber Reinforced Plastic Bar And Pre-Stressed Helical Rib Bar[J].Journal of Fiber reinforced Plastics/Compos-ites,2012(5):33-37.(in Chinese)
[4]任振华,曾宪桃,刘汉龙,等.复合内嵌筋材加固混凝土梁破坏模式分析[J].防灾减灾工程学报,2012,32(6):657-664.REN Zhenhua,ZENG Xiantao,LIU Hanlong,et al.The Failure Modes of Reinforced Concrete Beams Strengthened with Multiple Near-surfaceMounted Bar[J].Journal of Disaster Prevention and Mitigation Engineering,2012,32(6):657-664.(in Chinese)
[5]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 ReinforcedPlastic[D].Nanjing:Hohai University,2012.(in Chinese)
[6]REN Zhenhua,LIU Hanlong,ZHOU Fengjun.The double linear strain distribution assumption of RC beam strengthened with external-bonded ornear-surface mounted fiber reinforced plastic[J].Journal of Central South University,2012,12(19):3582-3594.
[7]姚谏,朱晓旭,周延阳.混凝土表层嵌贴CFRP板条的粘结承载力[J].浙江大学学报:工学版,2008,42(1):34-38.YAO Jian,ZHU Xiaoxu,ZHOU Yanyang.The bond load of near-surface mounted CFRP plates[J].Journal of Zhejiang University:Engin-eering and Technology Edition,2008,42(1):34-38.(in Chinese)
[8]黄崇福.自然灾害基本定义的探讨[J].自然灾害学报,2009,18(5):41-50.HUANG Chongfu.A discussion on basic definition of natural disaster[J].Journal of Natural Disasters,2009,18(5):41-50.(in Chinese)
[9]REN Zhenhua,ZENG Xiantao.Quasi-plane-hypothesis of strain coordination for rc beam strengthened with external-bonded or near-surfacemounted carbon fiber reinforced plastic strip[J].Advanced Materials Research,2011,255-260:54-58.
[10]REN Zhenhua,ZENG Xiantao,LIU Hanlong.Research on rc beams strengthened with near-surface mounted helical rib bar[J].AppliedMechanics and Materials,2011(90/91/92/93):1757-1760.
[11]ENG Xiantao,REN Zhenhua.Quasi-plane-hypothesis of strain coordination for rc beam strengthened with near-surface mounted carbon fiberreinforced plastic bar or helical rib bar[J].Advanced Materials Research,2011,(243/244/245/246/247/248/249):541-545.
[12]曾宪桃.表层内嵌碳纤维增强塑料板条混凝土梁弯剪性能研究[D].合肥:中国科学技术大学,2007.ZENG Xiantao.The Shear and Bend Performances of Concrete Beams Strengthened with Near-surface Mounted Reinforced Carbon Fiber PlasticLaminates[D].Hefei:University of Science and Technology of China,2007.(in Chinese)
[13]曾宪桃,段敬民,丁亚红.内嵌预应力碳纤维增强塑料筋混凝土梁正截面承载力计算[J].工程力学,2006,23(增刊2):112-116.ZENG Xiantao,DUAN Jingmin,DING Yahong.Calculation on method for bending capacity of concrete beams strengthened with pre-stressednear surface mounted carbon fiber reinforced plastic bar[J].Engineering mechanics,2006,23(S2):112-116.(in Chinese)
[14]孙治国,王东升,李宏男,等.汶川地震钢筋混凝土框架震害及震后修复建议[J].自然灾害学报,2010,19(4):114-123.SUN Zhiguo,WANG Dongsheng,LI Hongnan,et al.Damage investigation of RC frames in Wenchuan earthquake and suggestions forpost-earthquake rehabilitation[J].Journal of Natural Disasters,2010,19(4):114-123.(in Chinese)
[15]任振华.内嵌CFRP筋-预应力螺旋肋钢筋复合加固混凝土梁抗弯试验研究[D].焦作:河南理工大学,2009.REN Zhenhua.The Flexural Experiment of RC Beams Strengthened with Near-surface Mounted Carbon Fiber Reinforced Plastic-pre-stressedHelical Rib Rebar[D].Jiaozuo:Henan Polytechnic University,2009.(in Chinese)
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