基于MCFT的钢筋钢纤维混凝土深梁受剪承载力计算
|
摘要
在分析钢筋钢纤维混凝土深梁受剪机理和破坏特征的理论基础上,考虑钢纤维的有效分布,将MCFT运用到钢筋钢纤维混凝土深梁的受剪承载力分析中,并通过已有25根钢筋钢纤维混凝土深梁的试验结果,验证了该理论的可行性.在此基础上,运用MCFT对影响钢筋钢纤维混凝土深梁受剪承载力的因素进行分析.结果表明,混凝土强度对受剪承载力影响最大,受剪承载力随钢纤维体积率和梁底纵向钢筋配筋率的增大均呈先增大然后稍降低最终趋于稳定的特点,竖向分布筋的配筋率小于0. 6%时对受剪承载力的提高作用不如同体积率下钢纤维的提高作用显著,钢纤维长径比的影响作用最小.
Based on the theoretical analysis of the shear mechanism and failure characteristics of steel fiber reinforced concrete deep beams,and considering the effective distribution of steel fibers,the modified compression field theory(MCFT) is applied to the shear capacity analysis of steel fiber reinforced concrete deep beams,and the feasibility of this theory is verified by the test results of 25 existing steel reinforced concrete deep beams. Factors influencing shear bearing capacity of steel fiber reinforced concrete deep beams are analyzed based on MCFT. The results show that concrete strength plays the most important role in shear bearing capacity. With the increase of the volume fraction of steel fiber and the longitudinal reinforcement ratio of beam bottom,the shear bearing capacity increases first and then decreases slightly and maintains stability finally. The contribution of vertical reinforcement to shear bearing capacity is not as volume ratio of steel fiber significantly when the ratio is less than 0. 6%. The influence of steel fiber aspect ratio is minimal.
Based on the theoretical analysis of the shear mechanism and failure characteristics of steel fiber reinforced concrete deep beams,and considering the effective distribution of steel fibers,the modified compression field theory(MCFT) is applied to the shear capacity analysis of steel fiber reinforced concrete deep beams,and the feasibility of this theory is verified by the test results of 25 existing steel reinforced concrete deep beams. Factors influencing shear bearing capacity of steel fiber reinforced concrete deep beams are analyzed based on MCFT. The results show that concrete strength plays the most important role in shear bearing capacity. With the increase of the volume fraction of steel fiber and the longitudinal reinforcement ratio of beam bottom,the shear bearing capacity increases first and then decreases slightly and maintains stability finally. The contribution of vertical reinforcement to shear bearing capacity is not as volume ratio of steel fiber significantly when the ratio is less than 0. 6%. The influence of steel fiber aspect ratio is minimal.
引文
[1]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003.
[2] YANG K H,ASHOUR A F. Strut-and-tie model based on crack band theory for deep beams[J]. Journal of Structural Engineering,2011,137(10):1030-1038.
[3] KIM B H,YUN Y M. An indeterminate strut-tie model and load distribution ratio for RC deep beams-(I)model&load distribution ratio[J]. Advances in Structural Engineering,2011,14(6):1031-1041.
[4] KONG F K,ROBINS P J,SINGH A,et al. Shear analysis and design of reinforced concrete deep beams[J]. The Structural Engineer,1972,50(10):311-323.
[5]刘胜兵,徐礼华,周建民.混杂纤维高性能混凝土强度的正交试验[J].武汉理工大学学报(自然科学版),2009,31(8):5-9.
[6]赵军,朱海堂,高丹盈.钢筋钢纤维混凝土深梁受剪承载力的试验研究[J].河南科学,2003,21(5):670-673.
[7]赵军,高丹盈,朱海堂.钢筋钢纤维混凝土深梁受剪承载力塑性分析[J].郑州大学学报(理学版),2004,36(3):83-86.
[8] VECCHIO F J,COLLINS M P. The modified compression field theory for reinforced concrete elements subjected to shear[J]. ACI Structural Journal,1986,83(2):219-231.
[9] COLLINS M P,MITCHELL D. Prestressed concrete structure[M]. Canada:Response Publications,1997.
[10]聂建国,周萌.基于修正压力场模型的膜单元的开发及其在组合结构中的应用[J].土木工程学报,2013,46(9):62-71.
[11]高丹盈,史科.基于MCFT理论的钢筋钢纤维混凝土梁柱节点受剪性能计算方法[J].土木工程学报,2016,49(2):41-48.
[12]高丹盈,史科,赵军.钢筋钢纤维混凝土梁柱节点受剪承载力基于八面体强度的计算模型[J].建筑结构学报,2015,36(8):82-89.
[13]朱孔峰,逯静洲,刘亚,等.基于修正压力场理论的混杂纤维钢筋混凝土深梁的抗剪承载力研究[J].烟台大学学报(自然科学与工程版),2016,29(3):216-221.
[14] SPINELLA N,COLAJANNI P,MENDOLA L L. Nonlinear analysis of beams reinforced in shear with stirrups and steel fibers[J]. ACI Structural Journal,2012,109(1):53-65.
[15] KWAK Y K,EBERHARD M O,KIM W S,et al.Shear strength of steel fiber-reinforced concrete beams without stirrups[J]. ACI Structural Journal,2003,99(4):530-538.
[16] ARSLAN G. Shear strength of steel fiber reinforced concrete(SFRC)slender beams[J]. Ksce Journal of Civil Engineering,2014,18(2):587-594.
[17] SWAMY R N,JONES R,CHIAM A T P. Influence of steel fibers on the shear resistance of lightweight concrete Ibeams[J]. ACI Structural Journal,1993,90(1):103-114.
[18] TAN K H,MURUGAPPAN K,PARAMASIVAM P.Shear behavior of steel fiber reinforced concrete beams[J]. ACI Structural Journal,1993,107(5):597-606.
[19] MADAN S K,KUMAR G R,SINGH S P. Steel fibers as replacement of web reinforcement for RCC deep beams in shear[J]. Asian Journal of Civil Engineering(Building and Housing),2007,8(5):479-489.
[20]池寅,徐礼华,夏冬桃.钢纤维混凝土深梁试验研究与非线性有限元分析[J].土木工程与管理学报,2007,24(2):52-55.
[21] MANSUR M A,QNG K C G,PARAMASIVAM P.Shear strength of fibrous concrete beams without stirrups[J].Journal of Structural Engineering,1986,112(9):2066-2079.
[2] YANG K H,ASHOUR A F. Strut-and-tie model based on crack band theory for deep beams[J]. Journal of Structural Engineering,2011,137(10):1030-1038.
[3] KIM B H,YUN Y M. An indeterminate strut-tie model and load distribution ratio for RC deep beams-(I)model&load distribution ratio[J]. Advances in Structural Engineering,2011,14(6):1031-1041.
[4] KONG F K,ROBINS P J,SINGH A,et al. Shear analysis and design of reinforced concrete deep beams[J]. The Structural Engineer,1972,50(10):311-323.
[5]刘胜兵,徐礼华,周建民.混杂纤维高性能混凝土强度的正交试验[J].武汉理工大学学报(自然科学版),2009,31(8):5-9.
[6]赵军,朱海堂,高丹盈.钢筋钢纤维混凝土深梁受剪承载力的试验研究[J].河南科学,2003,21(5):670-673.
[7]赵军,高丹盈,朱海堂.钢筋钢纤维混凝土深梁受剪承载力塑性分析[J].郑州大学学报(理学版),2004,36(3):83-86.
[8] VECCHIO F J,COLLINS M P. The modified compression field theory for reinforced concrete elements subjected to shear[J]. ACI Structural Journal,1986,83(2):219-231.
[9] COLLINS M P,MITCHELL D. Prestressed concrete structure[M]. Canada:Response Publications,1997.
[10]聂建国,周萌.基于修正压力场模型的膜单元的开发及其在组合结构中的应用[J].土木工程学报,2013,46(9):62-71.
[11]高丹盈,史科.基于MCFT理论的钢筋钢纤维混凝土梁柱节点受剪性能计算方法[J].土木工程学报,2016,49(2):41-48.
[12]高丹盈,史科,赵军.钢筋钢纤维混凝土梁柱节点受剪承载力基于八面体强度的计算模型[J].建筑结构学报,2015,36(8):82-89.
[13]朱孔峰,逯静洲,刘亚,等.基于修正压力场理论的混杂纤维钢筋混凝土深梁的抗剪承载力研究[J].烟台大学学报(自然科学与工程版),2016,29(3):216-221.
[14] SPINELLA N,COLAJANNI P,MENDOLA L L. Nonlinear analysis of beams reinforced in shear with stirrups and steel fibers[J]. ACI Structural Journal,2012,109(1):53-65.
[15] KWAK Y K,EBERHARD M O,KIM W S,et al.Shear strength of steel fiber-reinforced concrete beams without stirrups[J]. ACI Structural Journal,2003,99(4):530-538.
[16] ARSLAN G. Shear strength of steel fiber reinforced concrete(SFRC)slender beams[J]. Ksce Journal of Civil Engineering,2014,18(2):587-594.
[17] SWAMY R N,JONES R,CHIAM A T P. Influence of steel fibers on the shear resistance of lightweight concrete Ibeams[J]. ACI Structural Journal,1993,90(1):103-114.
[18] TAN K H,MURUGAPPAN K,PARAMASIVAM P.Shear behavior of steel fiber reinforced concrete beams[J]. ACI Structural Journal,1993,107(5):597-606.
[19] MADAN S K,KUMAR G R,SINGH S P. Steel fibers as replacement of web reinforcement for RCC deep beams in shear[J]. Asian Journal of Civil Engineering(Building and Housing),2007,8(5):479-489.
[20]池寅,徐礼华,夏冬桃.钢纤维混凝土深梁试验研究与非线性有限元分析[J].土木工程与管理学报,2007,24(2):52-55.
[21] MANSUR M A,QNG K C G,PARAMASIVAM P.Shear strength of fibrous concrete beams without stirrups[J].Journal of Structural Engineering,1986,112(9):2066-2079.