碳纤维增强钢筋混凝土框架柱的界限轴压比和延性分析
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摘要
以新抗震设计规范为依据,分析并推导出碳纤维增强钢筋混凝土框架柱截面在界限破坏条件下的轴压比,研究了纵筋、箍筋和碳纤维布对柱轴压比限值和延性限值的影响.研究结果表明,纵筋等级越高,界限轴压比越小;箍筋和碳纤维布的体积配箍率越大,界限轴压比越大;现有公式不适用于约束混凝土柱在高轴压比下发生大偏心受压破坏时位移延性比的计算,因此对高轴压比下约束混凝土柱的延性性能需进一步研究.
In the earthquakeresistant design, the axialload ratio on the cross sections of the columns should be limited in order to protect the columns from destroying in the shear failure and to ensure the ductility of the columns. The paper analyzed and deduced the axialload ratio on the cross sections of the reinforced concrete columns strengthened with carbonfiberreinforced plastic (CFRP) sheets under the conditions of the limit destroy; and further studied the influences of the longitudinal reinforcement, the transverse reinforcement, the CFRP sheets on the limit values of the axialload ratio and the ductility of the columns. The result stated that the axialload ratio under the conditions of the limit failure decreases with the yield strength of longitudinal reinforcing bars and increases with ratio of the volume between transverse reinforcing bars and CFRP sheets and concrete. Moreover, the current equation of ductility ratio can not be used to evaluate ratio of lateral ductility of concrete columns confined by transverse reinforcement under conditions of the flexural failure of high axialload ratio, so the ductile property of concrete columns confined under that case should be studied more.
In the earthquakeresistant design, the axialload ratio on the cross sections of the columns should be limited in order to protect the columns from destroying in the shear failure and to ensure the ductility of the columns. The paper analyzed and deduced the axialload ratio on the cross sections of the reinforced concrete columns strengthened with carbonfiberreinforced plastic (CFRP) sheets under the conditions of the limit destroy; and further studied the influences of the longitudinal reinforcement, the transverse reinforcement, the CFRP sheets on the limit values of the axialload ratio and the ductility of the columns. The result stated that the axialload ratio under the conditions of the limit failure decreases with the yield strength of longitudinal reinforcing bars and increases with ratio of the volume between transverse reinforcing bars and CFRP sheets and concrete. Moreover, the current equation of ductility ratio can not be used to evaluate ratio of lateral ductility of concrete columns confined by transverse reinforcement under conditions of the flexural failure of high axialload ratio, so the ductile property of concrete columns confined under that case should be studied more.
引文
[1] 车宏亚.钢筋混凝土结构原理[M].天津:天津大学出版社,1990.27—28.
[2] GB5000.10—2002,混凝土结构设计规范[S].
[3] 王清湘,赵国藩,林立岩.高强混凝土柱延性的试验研究[J].建筑结构学报,1995,16(4):22—31.
[4] 陕西省建筑设计院.钢筋混凝土框架柱抗震性能的试验研究[M].北京:地震出版社,1979.
[5] 林大炎,王传志.矩形箍筋约束的混凝土应力 应变全曲线研究[A].清华大学抗震抗爆工程研究室编.钢筋混凝土结构的抗震性能[C].科学研究报告集第3集,北京:清华大学出版社,1981:19—37.
[6] 胡世平.对柱轴压比及含箍量取值的探讨[J],建筑结构,1988,81(3):17—23.
[7] ParkR,PaulayT.ReinforcedConcreteStructure[M].NewYork:PrenticeHall,1975.81—83.
[8] RobertPark,PriestleyMJNigel,WayneDGill.Ductilityofsquare confinedconcretecolumns[J].JournaloftheStructureDivision,ASCE,1982,108(4):416—426.
[9] 细谷学.炭素纤维ツ一トで补强さゎたT型断面の梁おょび柱のせん断性状[A].土木学会谕文集[C].No.592V—39,05 1998:37—52.
[10] 赵树红.碳纤维布加固混凝土柱受剪和抗震性能的试验研究[D].北京:清华大学,2000.
[2] GB5000.10—2002,混凝土结构设计规范[S].
[3] 王清湘,赵国藩,林立岩.高强混凝土柱延性的试验研究[J].建筑结构学报,1995,16(4):22—31.
[4] 陕西省建筑设计院.钢筋混凝土框架柱抗震性能的试验研究[M].北京:地震出版社,1979.
[5] 林大炎,王传志.矩形箍筋约束的混凝土应力 应变全曲线研究[A].清华大学抗震抗爆工程研究室编.钢筋混凝土结构的抗震性能[C].科学研究报告集第3集,北京:清华大学出版社,1981:19—37.
[6] 胡世平.对柱轴压比及含箍量取值的探讨[J],建筑结构,1988,81(3):17—23.
[7] ParkR,PaulayT.ReinforcedConcreteStructure[M].NewYork:PrenticeHall,1975.81—83.
[8] RobertPark,PriestleyMJNigel,WayneDGill.Ductilityofsquare confinedconcretecolumns[J].JournaloftheStructureDivision,ASCE,1982,108(4):416—426.
[9] 细谷学.炭素纤维ツ一トで补强さゎたT型断面の梁おょび柱のせん断性状[A].土木学会谕文集[C].No.592V—39,05 1998:37—52.
[10] 赵树红.碳纤维布加固混凝土柱受剪和抗震性能的试验研究[D].北京:清华大学,2000.
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