区域约束混凝土梁抗剪性能的试验研究
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摘要
区域约束混凝土结构是在约束混凝土研究的基础上发展起来的新的结构形式。区域约束混凝土是采用纵筋和箍筋组成的约束钢筋在特定的区域对混凝土进行的有效约束,由于约束钢筋提高了混凝土的变形能力及强度,约束区是以一个独立的小构件形式工作,从而使构件的承载力和延性性能得到有效提高。
与普通约束混凝土相比,区域约束混凝土的约束机制发生了改变,使得构件及截面的不同区域有不同的约束强度及延性,同时改变了构件的破坏形态。利用区域约束,能有效提高结构的抗震性能及安全度。由于承载力及抗震性能提高,在同样的荷载条件下,可以较大幅度地降低梁高,提高房屋的使用空间,降低材料及能源消耗,从而产生良好的经济效益。
本文通过3根集中荷载作用下的简支梁(一根普通钢筋混凝土梁及两根为不同箍筋间距约束的约束混凝土梁)抗剪对比试验,对区域约束混凝土梁的受剪破坏的全过程、开裂荷载、极限承载力、斜裂缝的分布形态、破坏形态、钢筋应变分布以及影响抗剪强度的因素进行了分析研究,结果证明,区域约束混凝土梁在提高抗剪承载力的同时,还可以增加斜裂截面抵抗剪切变形的能力。由于上部约束区以独立构件工作,在加载后期有效的限制了斜裂缝的开展,可以改善梁剪切破坏的突然性。
Regional Confined Concrete (RCC) is a newly developed structure based on the research of normal confined concrete (NCC). The confined area acted an independence small element form with work. The RCC promotes the load-carrying capacity and ductility of concrete elements efficiently by confining the concrete with longitudinal bars and stirrups where are needed.
Compared with NCC, RCC has its own mechanical property and different failure mode due to the change of confining configuration.The anti-seismic capacity and safety margin can be improved if the RCC is applied to structures. The RCC reduces the section of elements efficiently therefore the clear space of house can be increased and the material and energy saved.
Three beams with un-integral supports subjected to shear forces are tested in the research project including' one NCC beam and two RCC beams. Analyses are conducted focusing on the resisting shear capacity, forming of cracks, failure modes, longitudinal bars and stirrups work behaviors. Results shown that the RCC improved the resisting shear capacity and delayed the failure.
与普通约束混凝土相比,区域约束混凝土的约束机制发生了改变,使得构件及截面的不同区域有不同的约束强度及延性,同时改变了构件的破坏形态。利用区域约束,能有效提高结构的抗震性能及安全度。由于承载力及抗震性能提高,在同样的荷载条件下,可以较大幅度地降低梁高,提高房屋的使用空间,降低材料及能源消耗,从而产生良好的经济效益。
本文通过3根集中荷载作用下的简支梁(一根普通钢筋混凝土梁及两根为不同箍筋间距约束的约束混凝土梁)抗剪对比试验,对区域约束混凝土梁的受剪破坏的全过程、开裂荷载、极限承载力、斜裂缝的分布形态、破坏形态、钢筋应变分布以及影响抗剪强度的因素进行了分析研究,结果证明,区域约束混凝土梁在提高抗剪承载力的同时,还可以增加斜裂截面抵抗剪切变形的能力。由于上部约束区以独立构件工作,在加载后期有效的限制了斜裂缝的开展,可以改善梁剪切破坏的突然性。
Regional Confined Concrete (RCC) is a newly developed structure based on the research of normal confined concrete (NCC). The confined area acted an independence small element form with work. The RCC promotes the load-carrying capacity and ductility of concrete elements efficiently by confining the concrete with longitudinal bars and stirrups where are needed.
Compared with NCC, RCC has its own mechanical property and different failure mode due to the change of confining configuration.The anti-seismic capacity and safety margin can be improved if the RCC is applied to structures. The RCC reduces the section of elements efficiently therefore the clear space of house can be increased and the material and energy saved.
Three beams with un-integral supports subjected to shear forces are tested in the research project including' one NCC beam and two RCC beams. Analyses are conducted focusing on the resisting shear capacity, forming of cracks, failure modes, longitudinal bars and stirrups work behaviors. Results shown that the RCC improved the resisting shear capacity and delayed the failure.
引文
[1]中华人民共和国建设部.中华人民共和国国家标准《混凝土结构设计规范》GB 50010-2002,中国建筑工业出版社,2002.
[2]中华人民共和国建设部.中华人民共和国国家标准《建筑抗震设计规范》GB 50011-2001,中国建筑工业出版社,2002.
[3]湖南大学等.建筑结构试验:中国建筑工业出版社,1985.7.
[4]抗剪强度专题研究组:钢筋混凝土构件斜截面抗剪强度计算,见:钢筋混凝土结构设计与构造。1985年设计规范背景资料汇编,中国建筑科学研究院编,1985。
[5]卫纪德.连续构件抗剪性能研究之一:集中荷载作用下有腹筋约束梁的抗剪强度.哈尔滨建筑工程学院学报.1985.3.
[6]卫纪德.连续构件抗剪性能研究之二:集中荷载作用下有腹筋连续梁的抗剪强度.哈尔滨建筑工程学院学报.1985.4.
[7]卫纪德等.集中荷载作用下钢筋混凝土伸臂梁、连续梁的抗剪强度.建筑结构学报1989.
[8]王娴明.建筑结构试验.北京:清华大学出版社,1988.7.
[9]王传志,滕智明.钢筋混凝土结构理论.北京:中国建筑工业出版社,1985.
[10]瓦西利耶夫,O.A.罗奇尼来克;钢筋混凝土构件抗剪强度,李鸿猷译,1976.
[11]过镇海.钢筋混凝土原理和分析.北京:清华大学出版社,2003.12.
[12]过镇海.混凝土的多轴强度介绍.建筑结构学报,1994,15(60):72-75.
[13]过镇海.混凝土的强度和变形试验基础和本构关系.北京:清华大学出版社,1997.12.
[14]刘立新,钢筋混凝土梁受剪承载力的统一计算方法,郑州工业大学学报,2000年6月,第21卷,第2期:54-78
[15]刘兴远等.既有钢筋混凝土梁抗剪性能试验研究。重庆建筑施工与技术,2006。
[16]孙克俭.钢筋混凝土结构的延性及延性设计,内蒙古人民出版社,1991.
[17]吴绮芸等:约束混凝土强度和变形的试验研究,中国建筑科学研究报告,20, 1982.
[18]张秀琴,过镇海等.“反复荷载下箍筋约束混凝土的应力-应变全曲线方程”,工业建筑,1985,(12):16-20.
[19]张鹏.FRP筋混凝土梁受力性能的试验研究及理论分析.博士学位论文,2005.
[20]陈文钦、牛绍仁、秦文钺等.集中荷载下钢筋混凝土约束梁的抗剪强度的试验研究.重庆建筑工程学院学报.1984.3
[21]李艳艳.HRB400钢筋混凝土梁受剪斜裂缝宽度的试验研究.硕士学位论文,2006.
[22]李玉麟;矩形螺旋筘约束混凝土受压柱基本性能的试验研究,西安冶金建筑学院硕士论文,1990。
[23]罗苓隆,过镇海.箍筋约束混凝土的受力机理及应力-应变全曲线的计算.清华大学抗震抗爆工程研究室.科学研究报告集,第六集,1996:202-223.
[24]柏洁.区域约束混凝土梁的试验研究.硕士论文,2005.
[25]曹新明等.约束混凝土轴心受压柱的延性,贵州工业大学学报,No.6,2002.
[26]曹新明等.区域约束混凝土性能试验研究[J],建筑结构,2006:Vol.36(S1):5-17-5-21。
[27]曹祖周等;陶粒混凝土棱柱体和配箍棱柱体应—应变全曲线的研究,天津大学土木系,1983,6.
[28]董春敏,均_布荷载下高强箍筋混凝土梁抗剪性能研究。硕士学位论文,2003.
[29]蔡绍怀;套筋混凝土轴心受压构件的强度设计,建筑技术通讯(建筑结构),4,1984.
[30]戴自强等:约束混凝土柱强度和变形的试验研究,天津大学学报,4,1984.
[31]ACI-ASCE Committee 426.Shear Strength of Reinforced Concrete Members.ASCE,Journal of Structural Engineering.1973.99(6).1091-1187.
[32]Architectural Institute of Japan.All Structural Japanese Design Guidelines for Reinforced Concrete Buldings.Japan:1990,1990,pp.77-123,pp.146-162.
[33]Cao X.M.Confined Concrete in Moment Element.[ISCC 2004].
[34]Cao X.M.Influence of Longitudinal Steel on Ductility of Square Columns under Axial Load.Journal of 6uizhou university of techno]ogy,2002,31.
[35]J.B.Mander,M.J.N.Priest]ey and R.Park."Theoretical.Stress-Strain Model for Confined Concrete",ASCE,1988,(8):1804-1826.
[36]Jonit ASCE-ACI Task Committee 426.The Shear Strength of Reinforced Concrete Members.ASCE,1973(ST6):1091-1187.
[37]Liu TCY etal.Stress-Strain Response and Fracture of Concrete in Uniaxia]and Biaxial Compression.ACI,May 1972:291-295.
[38]Murat Saatcioglu.Strength and Ductility of Confined Concrete,Journal of Structural Engineering,Vol.118,No.6,June 1992,pp1590-1607.
[39]R.C.Elstner,K.G.Moody,I.M.Viest,E.Hognestad.Shear Strength of Reinforced Concrete Beams,Part3-Test of Restrained Beams With Web Reinforcement.ACI Structrural Journal 1955.52(6)
[40]M.P.Nilsen et al:Concrete plasticity,Bygningnsstatik,Lingby,1978
[41]Report of ACI-ASCE Committee 326:Shear and Diagonal Tension,ACI,59(1),1-30,(2),277-333,(3),353-395,1962.
[42]R.Park:Capacity design of ductile RC building structures for earthquake resistance,The Strctural Engineering,70(16),279-289,August,1992.
[43]S.A.Sheikh and S.M.Uzumeri.Analytical Model for Concrete Confinement in Tide Columns,ASCE,1982,(12):2703-2722.
[44]T.Ichinose.A Shear Design Equation for Ductility R/C Members.Earthquake Engineering and Structural Dynamics,Vol.21,1992,pp197-214.
[45]Xi X.Y;Cao X.M.Research on Application of Confined Concrete in Beams.贵州工业大学学报,2003,32(1).
[2]中华人民共和国建设部.中华人民共和国国家标准《建筑抗震设计规范》GB 50011-2001,中国建筑工业出版社,2002.
[3]湖南大学等.建筑结构试验:中国建筑工业出版社,1985.7.
[4]抗剪强度专题研究组:钢筋混凝土构件斜截面抗剪强度计算,见:钢筋混凝土结构设计与构造。1985年设计规范背景资料汇编,中国建筑科学研究院编,1985。
[5]卫纪德.连续构件抗剪性能研究之一:集中荷载作用下有腹筋约束梁的抗剪强度.哈尔滨建筑工程学院学报.1985.3.
[6]卫纪德.连续构件抗剪性能研究之二:集中荷载作用下有腹筋连续梁的抗剪强度.哈尔滨建筑工程学院学报.1985.4.
[7]卫纪德等.集中荷载作用下钢筋混凝土伸臂梁、连续梁的抗剪强度.建筑结构学报1989.
[8]王娴明.建筑结构试验.北京:清华大学出版社,1988.7.
[9]王传志,滕智明.钢筋混凝土结构理论.北京:中国建筑工业出版社,1985.
[10]瓦西利耶夫,O.A.罗奇尼来克;钢筋混凝土构件抗剪强度,李鸿猷译,1976.
[11]过镇海.钢筋混凝土原理和分析.北京:清华大学出版社,2003.12.
[12]过镇海.混凝土的多轴强度介绍.建筑结构学报,1994,15(60):72-75.
[13]过镇海.混凝土的强度和变形试验基础和本构关系.北京:清华大学出版社,1997.12.
[14]刘立新,钢筋混凝土梁受剪承载力的统一计算方法,郑州工业大学学报,2000年6月,第21卷,第2期:54-78
[15]刘兴远等.既有钢筋混凝土梁抗剪性能试验研究。重庆建筑施工与技术,2006。
[16]孙克俭.钢筋混凝土结构的延性及延性设计,内蒙古人民出版社,1991.
[17]吴绮芸等:约束混凝土强度和变形的试验研究,中国建筑科学研究报告,20, 1982.
[18]张秀琴,过镇海等.“反复荷载下箍筋约束混凝土的应力-应变全曲线方程”,工业建筑,1985,(12):16-20.
[19]张鹏.FRP筋混凝土梁受力性能的试验研究及理论分析.博士学位论文,2005.
[20]陈文钦、牛绍仁、秦文钺等.集中荷载下钢筋混凝土约束梁的抗剪强度的试验研究.重庆建筑工程学院学报.1984.3
[21]李艳艳.HRB400钢筋混凝土梁受剪斜裂缝宽度的试验研究.硕士学位论文,2006.
[22]李玉麟;矩形螺旋筘约束混凝土受压柱基本性能的试验研究,西安冶金建筑学院硕士论文,1990。
[23]罗苓隆,过镇海.箍筋约束混凝土的受力机理及应力-应变全曲线的计算.清华大学抗震抗爆工程研究室.科学研究报告集,第六集,1996:202-223.
[24]柏洁.区域约束混凝土梁的试验研究.硕士论文,2005.
[25]曹新明等.约束混凝土轴心受压柱的延性,贵州工业大学学报,No.6,2002.
[26]曹新明等.区域约束混凝土性能试验研究[J],建筑结构,2006:Vol.36(S1):5-17-5-21。
[27]曹祖周等;陶粒混凝土棱柱体和配箍棱柱体应—应变全曲线的研究,天津大学土木系,1983,6.
[28]董春敏,均_布荷载下高强箍筋混凝土梁抗剪性能研究。硕士学位论文,2003.
[29]蔡绍怀;套筋混凝土轴心受压构件的强度设计,建筑技术通讯(建筑结构),4,1984.
[30]戴自强等:约束混凝土柱强度和变形的试验研究,天津大学学报,4,1984.
[31]ACI-ASCE Committee 426.Shear Strength of Reinforced Concrete Members.ASCE,Journal of Structural Engineering.1973.99(6).1091-1187.
[32]Architectural Institute of Japan.All Structural Japanese Design Guidelines for Reinforced Concrete Buldings.Japan:1990,1990,pp.77-123,pp.146-162.
[33]Cao X.M.Confined Concrete in Moment Element.[ISCC 2004].
[34]Cao X.M.Influence of Longitudinal Steel on Ductility of Square Columns under Axial Load.Journal of 6uizhou university of techno]ogy,2002,31.
[35]J.B.Mander,M.J.N.Priest]ey and R.Park."Theoretical.Stress-Strain Model for Confined Concrete",ASCE,1988,(8):1804-1826.
[36]Jonit ASCE-ACI Task Committee 426.The Shear Strength of Reinforced Concrete Members.ASCE,1973(ST6):1091-1187.
[37]Liu TCY etal.Stress-Strain Response and Fracture of Concrete in Uniaxia]and Biaxial Compression.ACI,May 1972:291-295.
[38]Murat Saatcioglu.Strength and Ductility of Confined Concrete,Journal of Structural Engineering,Vol.118,No.6,June 1992,pp1590-1607.
[39]R.C.Elstner,K.G.Moody,I.M.Viest,E.Hognestad.Shear Strength of Reinforced Concrete Beams,Part3-Test of Restrained Beams With Web Reinforcement.ACI Structrural Journal 1955.52(6)
[40]M.P.Nilsen et al:Concrete plasticity,Bygningnsstatik,Lingby,1978
[41]Report of ACI-ASCE Committee 326:Shear and Diagonal Tension,ACI,59(1),1-30,(2),277-333,(3),353-395,1962.
[42]R.Park:Capacity design of ductile RC building structures for earthquake resistance,The Strctural Engineering,70(16),279-289,August,1992.
[43]S.A.Sheikh and S.M.Uzumeri.Analytical Model for Concrete Confinement in Tide Columns,ASCE,1982,(12):2703-2722.
[44]T.Ichinose.A Shear Design Equation for Ductility R/C Members.Earthquake Engineering and Structural Dynamics,Vol.21,1992,pp197-214.
[45]Xi X.Y;Cao X.M.Research on Application of Confined Concrete in Beams.贵州工业大学学报,2003,32(1).