压扭作用下混凝土异形柱的抗扭性能
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摘要
为考察轴压比、截面形状、配筋情况对异形柱抗扭性能的影响,对9根混凝土异形柱在压力和扭矩共同作用下抗扭性能进行研究。试验结果表明:轴压比对钢筋混凝土异形柱的抗扭性能影响较大,异形柱的开裂扭矩和极限扭矩随轴压比的增加而增大。轴压比为0.189和0.314的L形柱的开裂扭矩较轴压比为0.063的提高了23.7%和74.0%,极限扭矩提高了14.2%和38.7%。轴压比为0.314的T形柱的开裂扭矩和极限扭矩较轴压比为0.189的分别提高了71.0%和16.0%。配置钢筋能显著提高素混凝土异形柱的开裂扭矩、极限扭矩和极限扭转角。轴压比为0.189的配筋L形柱、T形柱和十字形柱较相应的素混凝土异形柱的开裂扭矩分别提高了40.8%,18.9%和26.2%;极限扭矩分别提高了102.0%,106.1%和63.9%;极限扭转角分别提高了486.1%,469.4%和494.0%。轴压比、横截面面积和配筋率均相同时,异形柱的开裂扭矩从大到小依次为L形柱,T形柱,十字形柱。十字形柱和T形柱的极限扭转角较L形柱大34.6%~44.3%。
Nine concrete columns with special-shaped cross section were tested under the pressure and torque to investigate the effects of axial load ratio,sectional shape and steel arrangement on the torsion behavior of specimens.The experimental results show that the axial ratio has significant effect on the torsion behavior of special-shaped columns. The cracking torque and ultimate torque of special-shaped columns increase with the increase of axial load ratio.With the increase of axial load ratio from 0.063 to 0.189 and 0.314,the cracking torque of L-shaped columns are increased by 23.7% and 74.0%,the ultimate torque of L-shaped columns are increased by 14.2% and 38.7%.With the increase of axial load ratio from 0.189 to 0.314,the cracking torque and ultimate torque of T-shaped column are increased by 71.0% and 16.0%,respectively.The cracking torque,ultimate torque and ultimate torsion angle of special-shaped columns can be significantly increased by the arrangement of steel bar.Compared with plain concrete columns with an axial load ratio of 0.189,the cracking torque of reinforced concrete L-,T-,and +-shaped columns are increased by 40.8%,18.9% and 26.2%, the ultimate torque of reinforced concrete L-,T-,and +-shaped columns are increased by 102.0%,106.1% and 63.9%,the ultimate torsion angle of reinforced concrete L-,T-,and +-shaped columns are increased by 486.1%,469.4% and 494.0%. When the axial load ratio,cross sectional area and reinforcement ratio are just the same,the cracking torque of columns with differently-shaped cross sections decreases in the following order: L-shaped column,T-shaped column,+-shaped column.Compared with L-shaped columns,the ultimate torsion angle of reinforced concrete +-and T-shaped columns are increased by 34.6%.44.3%.
Nine concrete columns with special-shaped cross section were tested under the pressure and torque to investigate the effects of axial load ratio,sectional shape and steel arrangement on the torsion behavior of specimens.The experimental results show that the axial ratio has significant effect on the torsion behavior of special-shaped columns. The cracking torque and ultimate torque of special-shaped columns increase with the increase of axial load ratio.With the increase of axial load ratio from 0.063 to 0.189 and 0.314,the cracking torque of L-shaped columns are increased by 23.7% and 74.0%,the ultimate torque of L-shaped columns are increased by 14.2% and 38.7%.With the increase of axial load ratio from 0.189 to 0.314,the cracking torque and ultimate torque of T-shaped column are increased by 71.0% and 16.0%,respectively.The cracking torque,ultimate torque and ultimate torsion angle of special-shaped columns can be significantly increased by the arrangement of steel bar.Compared with plain concrete columns with an axial load ratio of 0.189,the cracking torque of reinforced concrete L-,T-,and +-shaped columns are increased by 40.8%,18.9% and 26.2%, the ultimate torque of reinforced concrete L-,T-,and +-shaped columns are increased by 102.0%,106.1% and 63.9%,the ultimate torsion angle of reinforced concrete L-,T-,and +-shaped columns are increased by 486.1%,469.4% and 494.0%. When the axial load ratio,cross sectional area and reinforcement ratio are just the same,the cracking torque of columns with differently-shaped cross sections decreases in the following order: L-shaped column,T-shaped column,+-shaped column.Compared with L-shaped columns,the ultimate torsion angle of reinforced concrete +-and T-shaped columns are increased by 34.6%.44.3%.
引文
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[8]陈向上,徐东强,张俊华.地震波扭转分量及其对异形柱结构的影响分析[J].四川建筑科学研究,2011,37(1):137-140.CHEN Xiang-shang,XU Dong-qiang,ZHANG Jun-hua.Torsional component of seismic waves and its influence analysison specially-shaped column structure[J].Sichuan BuildingScience,2011,37(1):137-140.
[9]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,2004,37(7):600-604.ZHAO Yan-jing,CHEN Yun-xia,YU Shun-quan.A research onlimited value of axial compression ratio of arbitrarily shaped RCcolumns[J].Journal of Tianjin University,2004,37(7):600-604.
[10]陈昌宏,马乐为,单建,等.钢筋混凝土异形柱框架节点抗震性能试验[J].工业建筑,2007,37(2):6-10.CHEN Chang-hong,MA Le-wei,SHAN Jian,et al.Aseismicperformance experiment on the special-shaped column framestructures joints of reinforced concrete[J].IndustrialConstruction,2007,37(2):6- 10.
[11]XU Yu-ye,WU Bo.Fire resistance of reinforced concretecolumns with L-,T-,and+-shaped cross sections[J].Fire SafetyJournal,2009,44(6):869-880.
[12]WU Bo,XU Yu-ye.Behavior of axially-and-rotationallyrestrained concrete columns with‘+’-shaped cross section andsubjected to fire[J].Fire Safety Journal,2009,44(2):212-218.
[13]XU Yu-ye,WU Bo,WANG Rong-hui,et al.Behavior ofreinforced concrete columns with‘T’-shaped cross section afterexposure to fire[J].Advanced Materials Research,2011,250/251/252/253:1696-1701.
[14]王依群,赵盼.异形柱框架结构的隔震设计[J].天津大学学报,2010,43(11):971-976.WANG Yi-qun,ZHAO Pan.Design of seismic isolated framewith specially shaped column[J].Journal of Tianjin University,2010,43(11):971-976.
[15]GB50010—2010,混凝土结构设计规范[S].GB50010—2010,Code for design of concrete[S].
[2]JIAO Jun-ting,YE Ying-hua,DIAO Bo.Bearing capacityanalysis of reinforced concrete L-shaped cross-section underbiaxial eccentric compression[J].Progress in Natural Science,2003,13(6):429-433.
[3]王丹,黄承逵,刘明,等.异形柱双偏压构件正截面承载力试验及设计方法研究[J].建筑结构学报,2001,22(5):37-42.WANG Dan,HUANG Cheng-kui,LIU Ming,et al.Research onexperiment and design method of specially-shaped columnsunder eccentric loading[J].Journal of Building Structures,2001,22(5):37-42.
[4]管仲国,李建中.L形异形柱抗弯能力方向异性与合理作用效应组合研究[J].土木工程学报,2008,41(4):24-30.GUAN Zhong-guo,LI Jian-zhong.Study on anisotropy of thebiaxial bending capacity and rational combination of the actioneffects for L-shaped columns[J].China Civil EngineeringJournal,2008,41(4):24 -30.
[5]王丹,黄承逵,刘明.L、T、十形柱受剪承载力研究[J].土木工程学报,2005,38(7):34-38,60.WANG Dan,HUANG Cheng-kui,LIU Ming.A study on theshear bearing capacity of special-shaped columns[J].ChinaCivil Engineering Journal,2005,38(7):34-38,60.
[6]王新堂,章钢.T形截面RC纯扭构件极限强度[J].青岛建筑工程学院学报,1996,17(1):1018.WANG Xin-tang,ZHANG Gang.The limiting strength of thepure torsional RC element with T section[J].Journal of QingdaoInstitute of Architecture and Engineering,1996,17(1):10-18.
[7]曹万林,胡国振,崔立长,等.钢筋混凝土带暗柱异形柱抗震性能试验及分析[J].建筑结构学报,2002,23(1):16-20,26.CAO Wan-lin,HU Guo-zhen,CUI Li-zhang et al.Experimentand analysis of seismic behavior of the+,L,T-shaped columnswith concealed columns[J].Journal of Building Structures,2002,23(1):16- 20,26.
[8]陈向上,徐东强,张俊华.地震波扭转分量及其对异形柱结构的影响分析[J].四川建筑科学研究,2011,37(1):137-140.CHEN Xiang-shang,XU Dong-qiang,ZHANG Jun-hua.Torsional component of seismic waves and its influence analysison specially-shaped column structure[J].Sichuan BuildingScience,2011,37(1):137-140.
[9]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,2004,37(7):600-604.ZHAO Yan-jing,CHEN Yun-xia,YU Shun-quan.A research onlimited value of axial compression ratio of arbitrarily shaped RCcolumns[J].Journal of Tianjin University,2004,37(7):600-604.
[10]陈昌宏,马乐为,单建,等.钢筋混凝土异形柱框架节点抗震性能试验[J].工业建筑,2007,37(2):6-10.CHEN Chang-hong,MA Le-wei,SHAN Jian,et al.Aseismicperformance experiment on the special-shaped column framestructures joints of reinforced concrete[J].IndustrialConstruction,2007,37(2):6- 10.
[11]XU Yu-ye,WU Bo.Fire resistance of reinforced concretecolumns with L-,T-,and+-shaped cross sections[J].Fire SafetyJournal,2009,44(6):869-880.
[12]WU Bo,XU Yu-ye.Behavior of axially-and-rotationallyrestrained concrete columns with‘+’-shaped cross section andsubjected to fire[J].Fire Safety Journal,2009,44(2):212-218.
[13]XU Yu-ye,WU Bo,WANG Rong-hui,et al.Behavior ofreinforced concrete columns with‘T’-shaped cross section afterexposure to fire[J].Advanced Materials Research,2011,250/251/252/253:1696-1701.
[14]王依群,赵盼.异形柱框架结构的隔震设计[J].天津大学学报,2010,43(11):971-976.WANG Yi-qun,ZHAO Pan.Design of seismic isolated framewith specially shaped column[J].Journal of Tianjin University,2010,43(11):971-976.
[15]GB50010—2010,混凝土结构设计规范[S].GB50010—2010,Code for design of concrete[S].
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