预应力碳纤维板局部加固对桥梁整体影响分析
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摘要
对某简支预应力钢筋混凝土T形桥梁进行了预应力碳纤维板加固,用有限元模拟和实际监测两种方法,对比分析了局部加固对桥梁整体的影响。研究结果表明:采用预应力碳纤维板加固桥梁,由于横向连接作用,各片T梁间存在一定程度的预应力传递,有效提高了整桥承载力。预应力碳纤维板加固混凝土桥梁时,碳纤维板与混凝土构件接触部位的纵向、横向和竖向均存在拉应力,有使碳纤维板从混凝土表面产生剥离的趋势。有限元模拟数据与实际监测结果比较吻合,说明有限元模拟方法可以应用于实际工程的辅助计算。
According to the reinforcement method on a simply supported prestressed reinforced concrete T-beam bridge with prestressed carbon fibre reinforced plastics( CFRP) plates,the effects of local reinforcement on the whole bridge were analyzed through the contrast of finite element simulation and actual monitoring. The results show that by using prestressed CFRP plates to strengthen the bridge,the carrying capacity of the whole bridge are effectively improved. The reason for improvement is the transverse connection which makes prestress transfer between the T-beams to some extent. Meanwhile,the tensile stresses exist in the longitudinal,transverseand vertical directions of the carbon fiber reinforced concrete bridge strengthened by prestressed CFRP sheets,which makes the carbon fiber plate have a tendency to be stripped off from the concrete surface. The finite element simulation results are in agreement with the actual monitoring results,which shows that the finite element simulation method can be used in the calculation of actual engineering.
According to the reinforcement method on a simply supported prestressed reinforced concrete T-beam bridge with prestressed carbon fibre reinforced plastics( CFRP) plates,the effects of local reinforcement on the whole bridge were analyzed through the contrast of finite element simulation and actual monitoring. The results show that by using prestressed CFRP plates to strengthen the bridge,the carrying capacity of the whole bridge are effectively improved. The reason for improvement is the transverse connection which makes prestress transfer between the T-beams to some extent. Meanwhile,the tensile stresses exist in the longitudinal,transverseand vertical directions of the carbon fiber reinforced concrete bridge strengthened by prestressed CFRP sheets,which makes the carbon fiber plate have a tendency to be stripped off from the concrete surface. The finite element simulation results are in agreement with the actual monitoring results,which shows that the finite element simulation method can be used in the calculation of actual engineering.
引文
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[6]何贤锋,彭晖.外部粘贴预应力碳纤维板技术加固桥梁结构的工程应用与评估[J].中国铁道科学,2007,28(2):139-144.
[7]李学俊,彭晖.预应力碳纤维板加固桥梁技术的工程应用及试验研究[J].建设机械技术与管理,2011,24(1):109-113.
[8]窦勇芝.预应力碳纤维板加固T梁关键设计和施工技术[J].结构工程师,2014,30(5):203-209.
[9]中华人民共和国交通运输部.公路桥梁承载能力检测评定规程:JTG/T J21—2011[S].北京:人民交通出版社,2011.
[10]陈爽,陈宜虎,梁进修,等.碳纤维加固锈蚀钢筋混凝土梁的疲劳抗弯性能[J].河南科技大学学报(自然科学版),2014,35(1):58-62.
[11]张彦红,姚勇,杨勇新,等.CFRP加固预应力空心板受弯性能非线性有限元分析[J].工程抗震与加固改造,2014,36(2):60-65.
[12]肖红菊,孙玉永.预应力碳纤维布加固损伤混凝土梁有限元分析[J].河南科技大学学报(自然科学版),2011,32(6):51-54.
[13]金凌志,谢旦,杨惠贤,等.基于ANSYS模拟的无黏结预应力RPC简支梁分析[J].混凝土,2011(9):23-24.
[2]GODAT A,LABOSSIERE P,NEALE K W,et al.Behavior of RC members strengthened in sheer with EB FRP:assessment of models and FE simulation approaches[J].Computers and structures,2012,92/93:269-282.
[3]NORDIN H,TALJSTEN B.Concrete beams strengthened with prestressed near surface mounted CFRP[J].Journal of composites for construction,2006,10(1):60-68.
[4]徐芸,徐荫,查润华,等.碳纤维板加固钢筋混凝土梁裂缝的试验研究[J].九江学院学报(自然科学版),2005,30(1):22-25.
[5]彭晖,尚守平,金勇俊,等.预应力碳纤维板加固受弯构件的试验研究[J].工程力学,2008,25(5):142-151.
[6]何贤锋,彭晖.外部粘贴预应力碳纤维板技术加固桥梁结构的工程应用与评估[J].中国铁道科学,2007,28(2):139-144.
[7]李学俊,彭晖.预应力碳纤维板加固桥梁技术的工程应用及试验研究[J].建设机械技术与管理,2011,24(1):109-113.
[8]窦勇芝.预应力碳纤维板加固T梁关键设计和施工技术[J].结构工程师,2014,30(5):203-209.
[9]中华人民共和国交通运输部.公路桥梁承载能力检测评定规程:JTG/T J21—2011[S].北京:人民交通出版社,2011.
[10]陈爽,陈宜虎,梁进修,等.碳纤维加固锈蚀钢筋混凝土梁的疲劳抗弯性能[J].河南科技大学学报(自然科学版),2014,35(1):58-62.
[11]张彦红,姚勇,杨勇新,等.CFRP加固预应力空心板受弯性能非线性有限元分析[J].工程抗震与加固改造,2014,36(2):60-65.
[12]肖红菊,孙玉永.预应力碳纤维布加固损伤混凝土梁有限元分析[J].河南科技大学学报(自然科学版),2011,32(6):51-54.
[13]金凌志,谢旦,杨惠贤,等.基于ANSYS模拟的无黏结预应力RPC简支梁分析[J].混凝土,2011(9):23-24.