BFRP筋钢纤维高强混凝土梁受弯性能试验研究
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摘要
纤维增强塑料(Fiber Reinforced Polymer,简称FRP)筋混凝土结构存在变形、裂缝宽度过大等问题,通过发挥钢纤维高强混凝土强度、韧性优势与FRP筋形成一种新型结构体系可以满足工程结构对耐久性与适用性的要求。本文采用试验研究与理论分析相结合的方法,研究了BFRP筋钢纤维高强混凝土梁的正截面受弯性能,主要研究内容及成果如下：
(1)研究了BFRP筋配筋率、钢纤维体积掺量对BFRP筋钢纤维高强混凝土梁开裂荷载和极限荷载的影响,描述了裂缝开展和破坏形态,分析了筋材应力-应变、挠度及裂缝宽度的变化规律。结果表明：钢纤维显著改善了BFRP筋钢纤维高强混凝土梁正常使用极限状态下的使用性能,缓解了构件耐久性与适用性之间的矛盾。
(2)BFRP筋钢纤维高强混凝土梁跨中正截面基本符合平截面假定。根据配筋率、钢纤维掺量采用不同的分析模型,分别运用极限理论建立了不同破坏形态的极限受弯承载力计算公式。
(3)采纳美国ACI规范计算裂缝宽度的原理,将钢纤维对裂缝宽度的影响简化为对纵筋类型系数的修正,发现少筋梁的Kf系数呈现线性发展趋势,超筋梁成折线形态发展,据此得到的裂缝宽度计算公式与试验结果符合较好。
(4)通过修正ACI规范公式中的有效惯性矩,得到与试验值吻合较好的BFRP筋钢纤维高强混凝土受弯构件挠度计算公式。
(5)根据构件脆性破坏特征的分析,给出了BFRP筋钢纤维高强混凝土受弯构件的延性定义及评价指标,并通过取得的试验数据验证了计算方法的准确性。
Concrete structure reinforced with fiber reinforced polymer (FRP) bars can usually cause a greater deflection and crack width. In order to get perfect durability and serviceability, a new structural system would be formed by use of steel fiber reinforced high strength concrete and FRP bars. Combining with the experimental researches and theoretical analysis, the flexural behavior of BFRP bar-reinforced high-strength concrete beams with steel fibers were studied in this paper, and the main results are as follows:
(1) An investigation was performed for the influence of ratio of reinforcement for FRP bars and fraction of steel fiber by volume on the load-bearing capacity of beams. The appearance and development of cracks, also failure mode was described. While, the changing trend of FRP reinforcement stress, deflection, crack width were analyzed. The test results indicate that steel fiber remarkably improved the working performance of BFRP bar-reinforced high-strength concrete beams with steel fibers.
(2) Based on the experimental research in this paper and the recent developments at home and abroad, the difference of the over reinforced beams and insufficient reinforced beams in failure mode as well as mechanical behavior were analyzed. It can be seen that plane sections before bending remain plane after bending. Then, the special calculation model of the BFRP bar-reinforced high-strength concrete beams with steel fibers at different reinforcement ratio and fraction of steel fiber were given, and the calculating methods of the ultimate moment capacities were established using the limit equilibrium theory.
(3) Considering the favorable effect of steel fiber on restricting crack width of concrete beams, the value of Kf revealed that the linear trend of over reinforced member and the broken line trend of insufficient reinforced member. Thus, The modified formula of maximum crack width based on the ACI code for the BFRP bar-reinforced concrete beam with steel fibers were put forward.
(4) The calculating methods for predicting the deflection of the BFRP bar-reinforced high strength concrete beam were proposed by modifying calculation method of the effective moment of inertia for traditional RC flexural members in ACI code.
(5) Based on the brittle failure characteristic of the specimens, the definition, evaluation index and calculating mode of ductility of the BFRP bar-reinforced concrete beam with steel fibers were proposed, and the accuracy was also be verified by the experimental data.
(1)研究了BFRP筋配筋率、钢纤维体积掺量对BFRP筋钢纤维高强混凝土梁开裂荷载和极限荷载的影响,描述了裂缝开展和破坏形态,分析了筋材应力-应变、挠度及裂缝宽度的变化规律。结果表明：钢纤维显著改善了BFRP筋钢纤维高强混凝土梁正常使用极限状态下的使用性能,缓解了构件耐久性与适用性之间的矛盾。
(2)BFRP筋钢纤维高强混凝土梁跨中正截面基本符合平截面假定。根据配筋率、钢纤维掺量采用不同的分析模型,分别运用极限理论建立了不同破坏形态的极限受弯承载力计算公式。
(3)采纳美国ACI规范计算裂缝宽度的原理,将钢纤维对裂缝宽度的影响简化为对纵筋类型系数的修正,发现少筋梁的Kf系数呈现线性发展趋势,超筋梁成折线形态发展,据此得到的裂缝宽度计算公式与试验结果符合较好。
(4)通过修正ACI规范公式中的有效惯性矩,得到与试验值吻合较好的BFRP筋钢纤维高强混凝土受弯构件挠度计算公式。
(5)根据构件脆性破坏特征的分析,给出了BFRP筋钢纤维高强混凝土受弯构件的延性定义及评价指标,并通过取得的试验数据验证了计算方法的准确性。
Concrete structure reinforced with fiber reinforced polymer (FRP) bars can usually cause a greater deflection and crack width. In order to get perfect durability and serviceability, a new structural system would be formed by use of steel fiber reinforced high strength concrete and FRP bars. Combining with the experimental researches and theoretical analysis, the flexural behavior of BFRP bar-reinforced high-strength concrete beams with steel fibers were studied in this paper, and the main results are as follows:
(1) An investigation was performed for the influence of ratio of reinforcement for FRP bars and fraction of steel fiber by volume on the load-bearing capacity of beams. The appearance and development of cracks, also failure mode was described. While, the changing trend of FRP reinforcement stress, deflection, crack width were analyzed. The test results indicate that steel fiber remarkably improved the working performance of BFRP bar-reinforced high-strength concrete beams with steel fibers.
(2) Based on the experimental research in this paper and the recent developments at home and abroad, the difference of the over reinforced beams and insufficient reinforced beams in failure mode as well as mechanical behavior were analyzed. It can be seen that plane sections before bending remain plane after bending. Then, the special calculation model of the BFRP bar-reinforced high-strength concrete beams with steel fibers at different reinforcement ratio and fraction of steel fiber were given, and the calculating methods of the ultimate moment capacities were established using the limit equilibrium theory.
(3) Considering the favorable effect of steel fiber on restricting crack width of concrete beams, the value of Kf revealed that the linear trend of over reinforced member and the broken line trend of insufficient reinforced member. Thus, The modified formula of maximum crack width based on the ACI code for the BFRP bar-reinforced concrete beam with steel fibers were put forward.
(4) The calculating methods for predicting the deflection of the BFRP bar-reinforced high strength concrete beam were proposed by modifying calculation method of the effective moment of inertia for traditional RC flexural members in ACI code.
(5) Based on the brittle failure characteristic of the specimens, the definition, evaluation index and calculating mode of ductility of the BFRP bar-reinforced concrete beam with steel fibers were proposed, and the accuracy was also be verified by the experimental data.
引文
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[2]Mehta P. K. Concrete durability-fifth year's progress. Proc. of the 2nd conf. on concrete durability[C].ACI SP 126-1,1991:1-31
[3]顾祥林主编.混凝土结构基本原理[M].上海：同济大学出版社2007
[4]Wu Z J, Wardenier J, Romeijin A. FRP developments and application in civil engineering [M]. Stevin:6-96-11, Faculty of Civil Engineering, Delft university of Technology, The Netherlands,1996
[5]焦楚元,彭春元,杨作用,等.钢纤维高强混凝土抗弯试验研究[J].建筑结构,2009,39(1)：66-68
[6]朱海堂,高丹盈,谢丽等.钢纤维高强混凝土弯曲韧性的试验研究[J].硅酸盐学报,2004,32(5)：656-660
[7]朱海堂,高丹盈,汤寄予.钢纤维高强混凝土的弯曲韧性的试验研究[J].硅酸盐学报,2004,32(5)：656-660
[8]Rashid M.A., Mansur M.A., Paramasivam P. Behavior of aramid fiber-reinforced polymer reinforced high strength concrete beams under bending. Journal of Composites for Construction [J].2005,9 (2):117-127
[9]A.F. Ashour. Flexural and shear capacities of concrete beams reinforced with GFRP bars. Construction and Building Materials[J].2006,20 (10):1005-1015
[10]H.A. Abdullah. Evaluation of deflection in concrete members reinforced with fibre-reinforced polymer (FRP) bars. Composite Structures [J].2002,56 (1):63-71
[11]C. Barris, Li. Torres, A. Turon, et al. An experimental study of the flexural behaviour of GFRP RC beams and comparison with prediction models. Composite Structures [J].2009,91 (3):286-295
[12]Denvid Lau, Hoat Joen Pam. Experimental study of hybrid FRP reinforced concrete beams. Engineering Structures [J].2010,32(12):3857-3865
[13]Ana Lilia Orozco, Arup K, Maji. Energy release infiber-reinforced plastic reinforced concrete beams [J]. Journal of Composites for Construction,2004,8(1):52-58
[14]A. Si-Larbi, E. Ferrier, P. Hamelin. Flexural behaviour of MRBC beams (multi-reinforcing bars concrete beams), promoting the use of FRHPC[J]. Composite Structures.2006,74(2): 163-174
[15]高丹盈,朱海堂,李趁趁.纤维增强塑料筋混凝土梁正截面抗裂性能的研究[J].水力发电学报,2003,22(4)：54-59
[16]高丹盈,朱海堂,谢晶晶.纤维增强聚合物筋混凝十粘结滑移本构模型[J].工业建筑, 2003,33(7)：41-43
[17]薛伟辰,康清梁.纤维塑料筋混凝土梁受力性能的试验研究[J].工业建筑,1999,29(12)：8-10
[18]杨雨,薛伟辰,郑乔文.FRP筋混凝土梁裂缝宽度的计算方法[J].水力发电学报,2008,27(6)：79-83
[19]薛伟辰,郑乔文,杨雨.纤维塑料筋混凝土梁挠度的计算方法[J].水力学报,2008,39(7)：883-888,894
[20]张鹏,薛伟辰,李冰等.FRP筋混凝土梁变形计算与控制研究[J].广西工学院学报,2006,17(4)：69-71,79
[21]宋洋.玄武岩FRP筋混凝土梁受弯性能试验研究[D].阜新：辽宁工程技术大学,2006
[22]李炳宏.玄武岩纤维增强塑料筋混凝土梁受弯性能研究[D].中国塑料：2009,23(7)：69-72
[23]Ashour S.A., Mahmood K, Wafa F.F. Influence of steel fibers and compression reinforcement on deflection of high-strength concrete beams [J]. ACI Structural Journal,1997,94(6): 611-624
[24]Daniel L, Loukili A. Behavior of high-strength fiber-reinforced concrete beams under cyclic loading [J]. ACI Structural Journal.2002,99(3):248-256
[25]Chunxiang Qian, Patnaikuni Indubhushan. Properties of high-strength steel fiber reinforced concrete beams in bending [J]. Cement and Concrete Composites.1999,21(1):73-81
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