BFRP约束方形混凝土柱轴心受压强度模型
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摘要
目前,FRP(纤维增强复合材料)约束混凝土强度模型大部分都是建立在FRP约束混凝土圆形柱基础之上。而FRP约束混凝土方形柱的侧向约束力受截面形状的影响较大,与圆形柱相比,由于拐角的应力集中导致的侧向约束应力不均匀等,使得FRP包裹方形柱的侧向约束效果明显降低,强度也随之下降。本文基于FRP约束圆柱体的强度公式,考虑方形柱的有效核心区、拐角效应的影响,引入对应的影响系数,建立了BFRP(玄武岩纤维复合材料)约束方形混凝土柱轴心抗压强度模型并与试验数据对比分析,结果表明,该模型具有良好的吻合度。
Currently,strength models of the concrete confined by FRP are built on ones of concrete columns confined by FRP.Compared with circular columns,the side-by-section shape makes a greater impact on square concrete columns confined by FRP.The uneven stress of sides constraint caused by the stress concentration at the corner make effects of sides constraint of square columns wrapped by FRP reduce significantly,strength drop subsequently.Based on the strength formula of cylinders confined by FRP,considered the influences of the effective core area of square column and the corner effects,introduced corresponding and influencing coefficients,the paper built up axial compressing strength model of square concrete coumns confined by BFRP,compared and analyzed the test data.The results suggest that the model has a high goodness of fit.
Currently,strength models of the concrete confined by FRP are built on ones of concrete columns confined by FRP.Compared with circular columns,the side-by-section shape makes a greater impact on square concrete columns confined by FRP.The uneven stress of sides constraint caused by the stress concentration at the corner make effects of sides constraint of square columns wrapped by FRP reduce significantly,strength drop subsequently.Based on the strength formula of cylinders confined by FRP,considered the influences of the effective core area of square column and the corner effects,introduced corresponding and influencing coefficients,the paper built up axial compressing strength model of square concrete coumns confined by BFRP,compared and analyzed the test data.The results suggest that the model has a high goodness of fit.
引文
[1]Restrepol J I.et al.Enhancement of The Axial Load-Capacity of Re-inforced Concrete Columns by Means of Fiberglass-Epoxy Jackets[C].Proceedings of the second International Confer-ence on An-vanced Composite Materials in Bridges and structures,Montreal,Canada.547-553.
[2]Chaallal O,et al.Performance of Fiber-Reinforced Polymer-WrappedReinfored Concrete Column under Combined Axial-Flexural Lading[J].ACI Structural Journal,2000,(4):659-668.
[3]Teng J G,et al.FRP Strengthened RC Structures[M].England:JohnWilley&Sons,LTD,2002.
[4]Lam L,Teng J G.Strength Models for Fiber-Reinforced Plastic-Con-fined Concrete.Journal of Structural Engineering[J].ASCE,2002,(5):612-622.
[5]Campione G,Miraglia N.Strength and strain capacities of concreteconcrete compression members reinforced with FRP[J].Cement&Concrete Composites,2003,25:31-41.
[6]王苏岩,韩克双,曲秀华.CFRP加固高强混凝土柱改善延性的试验研究[J].世界地震工程,2005,(3):7-10.
[7]朱毅.BFRP加固素混凝土方柱轴压力学性能尺寸效应研究[D].南昌:华东交通大学硕士学位论文,2008.
[8]张岩俊,曹明星,齐永顺.CFRP加固混凝土轴压柱承载力的分析[J].房产与应用,2006,(2):87-88.
[2]Chaallal O,et al.Performance of Fiber-Reinforced Polymer-WrappedReinfored Concrete Column under Combined Axial-Flexural Lading[J].ACI Structural Journal,2000,(4):659-668.
[3]Teng J G,et al.FRP Strengthened RC Structures[M].England:JohnWilley&Sons,LTD,2002.
[4]Lam L,Teng J G.Strength Models for Fiber-Reinforced Plastic-Con-fined Concrete.Journal of Structural Engineering[J].ASCE,2002,(5):612-622.
[5]Campione G,Miraglia N.Strength and strain capacities of concreteconcrete compression members reinforced with FRP[J].Cement&Concrete Composites,2003,25:31-41.
[6]王苏岩,韩克双,曲秀华.CFRP加固高强混凝土柱改善延性的试验研究[J].世界地震工程,2005,(3):7-10.
[7]朱毅.BFRP加固素混凝土方柱轴压力学性能尺寸效应研究[D].南昌:华东交通大学硕士学位论文,2008.
[8]张岩俊,曹明星,齐永顺.CFRP加固混凝土轴压柱承载力的分析[J].房产与应用,2006,(2):87-88.
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