T形和L形柱低剪跨比正反向受剪特性研究
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摘要
由于T形和L形柱特殊的截面形式,正反受剪时存在腹板和翼缘分别受压和受拉2种状态,其正反向受剪承载力和变形能力往往存在差异,且剪跨比越小这种差异越显著。对剪跨比λ=2.5时的T形和L形柱进行低周反复荷载试验,分析了低剪跨比状态下T形和L形柱正反向加载破坏特征、承载能力、变形能力和延性、刚度退化等抗震性能指标。研究表明,T形和L形柱正反2个方向受剪承载能力和变形能力存在显著差异,腹板受压时,柱脚腹板混凝土破坏严重,降低了异形柱的截面刚度和承载力,成为异形柱结构的薄弱部位。
Due to the special section of T and L-shaped columns,the web and the flange will bear pressure or tension under forward and reverse load.The shear capacity and deformation capacity are different under forward and reverse load,and when the shear-span is lower the difference is more obvious.Through low frequency cyclic loading experiment of T and L-shaped columns while the shear-span is 2.5,this paper investigated the failure characteristic,shear capacity,deformation capacity and rigidity degeneracy of the T and L-shaped columns with low shear-span ratio.The results show that the shear capacity and deformation capacity of the T and L-shaped columns are obviously different under forward and reverse load.The web concrete in column foot will be damaged seriously under pressure,which reduces the section stiffness and shear capacity,so the column foot may become the weak position of specially shaped columns.
Due to the special section of T and L-shaped columns,the web and the flange will bear pressure or tension under forward and reverse load.The shear capacity and deformation capacity are different under forward and reverse load,and when the shear-span is lower the difference is more obvious.Through low frequency cyclic loading experiment of T and L-shaped columns while the shear-span is 2.5,this paper investigated the failure characteristic,shear capacity,deformation capacity and rigidity degeneracy of the T and L-shaped columns with low shear-span ratio.The results show that the shear capacity and deformation capacity of the T and L-shaped columns are obviously different under forward and reverse load.The web concrete in column foot will be damaged seriously under pressure,which reduces the section stiffness and shear capacity,so the column foot may become the weak position of specially shaped columns.
引文
[1]THOMAS H C.T-shaped reinforced concrete members under biaxial bending and axial compression[J].ACI Structural Journal,1989,86(4):460-468.
[2]YAU C Y,CHAN S L,SO A K W.Biaxial bending design of arbitrarily shaped reinforced concrete column[J].ACI Structural Journal,1993,90(3):269-278.
[3]冯建平,陈谦,卫园,等.L形和T形截面柱正截面承载力的研究[J].华南理工大学学报(Journal of South China University ofTechnology),1995,23(1):54-61.
[4]肖芳,何放龙.L形、T形及十字形截面钢筋混凝土异形柱配筋计算[J].四川建筑科学研究(Sichuan Building Science),2002,28(1):10-12.
[5]赵艳静,李忠献,陈云霞.四级抗震等级时钢筋混凝土异形柱轴压比限值的研究[J].建筑结构学报(Journal of Building Structures),2004,25(3):58-62.
[6]赵艳静,陈云霞,于顺泉.钢筋混凝土异形截面框架柱轴压比限值的研究[J].天津大学学报(Journal of Tianjin University),2004,37(7):600-604.
[7]李杰,吴建营,周德源,等.L形和Z形宽肢异形柱低周反复荷载试验研究[J].建筑结构学报(Journal of Building Structures),2002,23(1):9-15.
[8]杜琛,王铁成,陈向上.L形截面宽肢混凝土柱破坏形态研究[J].沈阳理工大学学报(Journal of Shenyang Ligong University),2007,26(2):80-83.
[9]陈宗平,薛建阳,赵鸿铁,等.低周反复荷载作用下型钢混凝土异形柱的抗剪承载力分析[J].土木工程学报(China Civil EngineeringJournal),2007,40(7):30-36.
[10]郭棣,吴敏哲,艾兵.T形截面柱框架的抗震性能分析[J].西安建筑科技大学学报(自然科学版)(Journal of Xi'an University ofArchitecture and Technology(Natural Science Edition)),2003,35(3):205-207.
[11]李晓莉,郭棣,吴敏哲.T形截面柱的非线性分析[J].世界地震工程(World Earthquake Engineering),2005,21(3):122-125.
[12]曹万林,王光远.不同方向周期反复荷载作用下T形柱的性能[J].地震工程与工程振动(Journal of Earthquake Engineering andEngineering Vibration),1995,15(4):76-84.
[13]郭棣,吴敏哲,谢异同.宽肢T形柱的滞回特性及耗能分析[J].世界地震工程(World Earthquake Engineering),2002,18(2):146-149.
[14]曹万林,厐国新,卢立炜,等.较小剪跨比带暗柱T形柱抗震性能试验研究[J].地震工程与工程振动(Journal of Earthquake Engineeringand Engineering Vibration),1999,19(4):61-66.
[15]JGJ 149—2006,混凝土异形柱结构技术规程[S].北京:中国建筑工业出版社,2006.
[2]YAU C Y,CHAN S L,SO A K W.Biaxial bending design of arbitrarily shaped reinforced concrete column[J].ACI Structural Journal,1993,90(3):269-278.
[3]冯建平,陈谦,卫园,等.L形和T形截面柱正截面承载力的研究[J].华南理工大学学报(Journal of South China University ofTechnology),1995,23(1):54-61.
[4]肖芳,何放龙.L形、T形及十字形截面钢筋混凝土异形柱配筋计算[J].四川建筑科学研究(Sichuan Building Science),2002,28(1):10-12.
[5]赵艳静,李忠献,陈云霞.四级抗震等级时钢筋混凝土异形柱轴压比限值的研究[J].建筑结构学报(Journal of Building Structures),2004,25(3):58-62.
[6]赵艳静,陈云霞,于顺泉.钢筋混凝土异形截面框架柱轴压比限值的研究[J].天津大学学报(Journal of Tianjin University),2004,37(7):600-604.
[7]李杰,吴建营,周德源,等.L形和Z形宽肢异形柱低周反复荷载试验研究[J].建筑结构学报(Journal of Building Structures),2002,23(1):9-15.
[8]杜琛,王铁成,陈向上.L形截面宽肢混凝土柱破坏形态研究[J].沈阳理工大学学报(Journal of Shenyang Ligong University),2007,26(2):80-83.
[9]陈宗平,薛建阳,赵鸿铁,等.低周反复荷载作用下型钢混凝土异形柱的抗剪承载力分析[J].土木工程学报(China Civil EngineeringJournal),2007,40(7):30-36.
[10]郭棣,吴敏哲,艾兵.T形截面柱框架的抗震性能分析[J].西安建筑科技大学学报(自然科学版)(Journal of Xi'an University ofArchitecture and Technology(Natural Science Edition)),2003,35(3):205-207.
[11]李晓莉,郭棣,吴敏哲.T形截面柱的非线性分析[J].世界地震工程(World Earthquake Engineering),2005,21(3):122-125.
[12]曹万林,王光远.不同方向周期反复荷载作用下T形柱的性能[J].地震工程与工程振动(Journal of Earthquake Engineering andEngineering Vibration),1995,15(4):76-84.
[13]郭棣,吴敏哲,谢异同.宽肢T形柱的滞回特性及耗能分析[J].世界地震工程(World Earthquake Engineering),2002,18(2):146-149.
[14]曹万林,厐国新,卢立炜,等.较小剪跨比带暗柱T形柱抗震性能试验研究[J].地震工程与工程振动(Journal of Earthquake Engineeringand Engineering Vibration),1999,19(4):61-66.
[15]JGJ 149—2006,混凝土异形柱结构技术规程[S].北京:中国建筑工业出版社,2006.
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