钢筋混凝土柱低周疲劳损伤后的静力性能试验
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摘要
针对当前公路混凝土桥梁中普遍采用的柱式桥墩的典型情况和地震作用形式,设计了试验模型和试验方法。首先进行了低周疲劳试验,低周循环分为4个阶段,分别为弹性开裂阶段、屈服阶段和2类屈服后阶段。然后在循环完成后分别进行静力推倒和轴心受压破坏试验,研究了柱式桥墩模型在反复荷载作用下的损伤发展以及循环完成后的承载能力和变形能力,并分析了剪跨比、轴压比和纵筋配筋率等对钢筋混凝土柱损伤发展的影响。结果表明:水平低周疲劳效应对钢筋混凝土柱水平承载力的降低影响较大,对轴压承载力影响较小。研究结论可为震后桥梁性能评估、加固提供理论支持。
Aimed at general style of pier which was applied to highway concrete bridge and acting feature of earthquake,test model and experimental method were designed.Firstly,low-cycle fatigue test which inclued four stages was carried out.Four steps of low-cycle loading were set in accordance with elastical cracking phase,yielding phase,and two phases after yielding.After low-cycle loading,static push-over tests and axial compression tests of the damaged columns were carried out.Damage state,horizontal load-deformation and residual bearing capacity of column piers under iterative loading were studied.Based on the work mentioned in above,effects of shear-span ratio,axial load ratio and longitudinal reinforcement ratio on damaged state of reinforced concrete columns were analyzed.Results show that the degeneration of horizontal bearing capacity of the column is significantly influenced by horizontal low-cycle fatigue effect after low-cycle loading,while the degeneration of vertical bearing capacity is little influenced by it.Research conclusions can provide theoretical support for evaluation and reinforcement of bridge after seism.
Aimed at general style of pier which was applied to highway concrete bridge and acting feature of earthquake,test model and experimental method were designed.Firstly,low-cycle fatigue test which inclued four stages was carried out.Four steps of low-cycle loading were set in accordance with elastical cracking phase,yielding phase,and two phases after yielding.After low-cycle loading,static push-over tests and axial compression tests of the damaged columns were carried out.Damage state,horizontal load-deformation and residual bearing capacity of column piers under iterative loading were studied.Based on the work mentioned in above,effects of shear-span ratio,axial load ratio and longitudinal reinforcement ratio on damaged state of reinforced concrete columns were analyzed.Results show that the degeneration of horizontal bearing capacity of the column is significantly influenced by horizontal low-cycle fatigue effect after low-cycle loading,while the degeneration of vertical bearing capacity is little influenced by it.Research conclusions can provide theoretical support for evaluation and reinforcement of bridge after seism.
引文
[1]清华大学抗震抗爆工程研究室.钢筋混凝土结构的抗震性能[M].北京:清华大学出版社,1981.Research Laboratory of Earthquake and Blast Re-sistant Engineering of Tsinghua University.SeismicBehavior of Reinforced Concrete Structure[M].Bei-jing:Tsinghua University Press,1981.
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[3]刘伯权,白绍良,徐云中,等.钢筋混凝土柱低周疲劳性能的试验研究[J].地震工程与工程振动,1998,18(4):82-89.LIU Bo-quan,BAI Shao-liang,XU Yun-zhong,et al.Experimental Study of Low-cyclic Behavior of Con-crete Columns[J].Earthquake Engineering and En-gineering Vibration,1998,18(4):82-89.
[4]白绍良,张友为,黄宗明.不同轴压比下钢筋混凝土柱的低周疲劳性能[J].重庆建筑大学学报,1997,19(3):1-6.BAI Shao-liang,ZHANG You-wei,HUANG Zong-ming.Cyclic Fatigue Behaviors of Reinforced ConcreteColumns with Various Axial Force Ratios[J].Journalof Chongqing Jianzhu University,1997,19(3):1-6.
[5]李洪泉,雷立宏,吕西林.钢筋混凝土压弯构件低周疲劳损伤的抗力衰减试验研究[J].南京建筑工程学院学报,1998(3):10-16,32.LI Hong-quan,LEI Li-hong,LU Xi-lin.ExperimentalStudy on the Resistance Degradation of RC Compres-sion-flexure Member by Low Cyclic Loading[J].Jour-nal of Nanjing Architecture and Civil Engineering In-stitute,1998(3):10-16,32.
[6]朱伯龙,吴明舜,张琨联.在周期荷载作用下,钢筋混凝土构件滞回曲线考虑裂面接触效应的研究[J].同济大学学报:自然科学版,1980,16(1):63-75.ZHU Bo-long,WU Ming-shun,ZHANG Kun-lian.AStudy of Hysteretic Curve of Reinforced ConcreteMembers Under Cyclic Loading Taking Account ofLocal Contact Effects of Cracked Section[J].Journalof Tongji University:Natural Science,1980,16(1):63-75.
[7]EL-BAHY A,KUNNATH S K,STONE W C,et al.Cumulative Seismic Damage of Circular Bridge Col-umn:Benchmark and Low-cycle Fatigue Tests[J].ACI Structural Journal,1999,96(4):633-641.
[8]EL-BAHY A,KUNNATH S K,STONE W C,et al.Cumulative Seismic Damage of Circular Bridge Col-umns:Variable Amplitude Tests[J].ACI StructuralJournal,1999,96(5):711-719.
[9]成文山,邹银生,程翔云.钢筋混凝土压弯构件恢复力特性的研究[J].湖南大学学报:自然科学版,1983,10(4):10-16.CHENG Wen-shan,ZOU Yin-sheng,CHENG Xiang-yun.Research on the Characteristics of RestoringForce for Reinforced Concrete Members with Flexureand Axial Force[J].Journal of Hunan University:Natural Science,1983,10(4):10-16.
[10]朱伯龙,张琨联.矩形及环形截面压弯构件恢复力特性的研究[J].同济大学学报:自然科学版,1981,17(2):1-10.ZHU Bo-long,ZHANG Kun-lian.A Study of Re-storing Force Characteristics of Reinforced ConcreteFlexural Members with a Constant Axial Load[J].Journal of Tongji University:Natural Science,1981,17(2):1-10.
[11]卫云亭,李德成.钢筋混凝土压弯构件恢复力特性的试验研究[J].西安冶金建筑学院学报,1980,12(4):8-15.WEI Yun-ting,LI De-cheng.Experiments on Re-storing Force of RC Beam-column Members[J].Jour-nal of Xi an Metallurgy Construction Institute,1980,12(4):8-15.
[12]MANDER J B,PRIESTLEY M J N,PARK R.Ob-served Stress-strain Behaviour of Confined Concrete[J].Journal of Structural Engineering,1988,114(8):1827-1849.
[13]周文峰.结构地震动力反应分析中的混凝土恢复力模型的适用性研究[D].重庆:重庆大学,2003.ZHOU Wen-feng.Applicability Study of HystereticModel of Concrete in Dynamic Response Analysis[D].Chongqing:Chongqing University,2003.
[14]WANG M L,SHAN S P.Reinforced Concrete Hys-teresis Model Based on the Damage Concept[J].Earthquake Engineering&Structural Dynamics,1987,15(8):993-1003.
[15]MANDER J B,PRIESTLEY M J N,PARK R.The-oretical Stress-strain Model for Confined Concrete[J].Journal of Structural Engineering,1988,114(8):1804-1826.
[16]过镇海,张秀琴.混凝土在反复荷载作用下的应力-应变全曲线[J].工业建筑,1981,3(9):14-17,13.GUO Zhen-hai,ZHANG Xiu-qin.Stress-strain Equa-tion of Concrete Under Cyclic Loads[J].IndustrialConstruction,1981,3(9):14-17,13.
[17]SAATCIOGLU S M,RAZVI S R.Strength and Duc-tility of Confined Concrete[J].Journal of StructuralEngineering,1992,118(6):1590-1607.
[18]SHEIKH S A,UZUMERI S M.Strength and Duc-tility of Tied Concrete Columns[J].Journal of Struc-tural Division,1980,106(5):1079-1102.
[19]PARK R,PRIESTLEY M J N,GILL W D.Ductilityof Square-confined Concrete Columns[J].Journal ofStructural Division,1982,108(4):929-950.
[20]袁锦根.方箍约束钢筋混凝土压弯构件延性与其滞回模型[J].铁道学报,1989,11(增1):12-16.YUAN Jin-gen.Ductility and Hysteresis Model forRC Flexural-compression Members with RectangularTie Confinement[J].Journal of the China Railway So-ciety,1989,11(S1):12-16.
[21]张有为.钢筋混凝土框架柱抗震破坏准则[D].重庆:重庆建筑大学,1996.ZHANG You-wei.Anti-seismic Failure Criterion forRC Frame Structures[D].Chongqing:ChongqingJianzhu University,1996.
[22]王敏.抗震钢筋混凝土柱的破坏准则及截面混凝土纤维的损伤累积性能研究[D].重庆:重庆大学,2005.WANG Min.Research on Criteria for Failure of theRC Column and the Damage Cumulation Behavior ofIts Concrete Fiber[D].Chongqing:Chongqing Univer-sity,2005.
[2]程翔云,邹银生.在循环荷载作用下钢筋混凝土压弯构件的试验和滞回模型[J].湖南大学学报:自然科学版,1981,8(1):15-28.CHENG Xiang-yun,ZOU Yin-sheng.The Experimentand the Hysteresis Model of Reinforced ConcreteMembers in Combined Bending and Axial Load UnderCyclic Loading[J].Journal of Hunan University:Nat-ural Science,1981,8(1):15-28.
[3]刘伯权,白绍良,徐云中,等.钢筋混凝土柱低周疲劳性能的试验研究[J].地震工程与工程振动,1998,18(4):82-89.LIU Bo-quan,BAI Shao-liang,XU Yun-zhong,et al.Experimental Study of Low-cyclic Behavior of Con-crete Columns[J].Earthquake Engineering and En-gineering Vibration,1998,18(4):82-89.
[4]白绍良,张友为,黄宗明.不同轴压比下钢筋混凝土柱的低周疲劳性能[J].重庆建筑大学学报,1997,19(3):1-6.BAI Shao-liang,ZHANG You-wei,HUANG Zong-ming.Cyclic Fatigue Behaviors of Reinforced ConcreteColumns with Various Axial Force Ratios[J].Journalof Chongqing Jianzhu University,1997,19(3):1-6.
[5]李洪泉,雷立宏,吕西林.钢筋混凝土压弯构件低周疲劳损伤的抗力衰减试验研究[J].南京建筑工程学院学报,1998(3):10-16,32.LI Hong-quan,LEI Li-hong,LU Xi-lin.ExperimentalStudy on the Resistance Degradation of RC Compres-sion-flexure Member by Low Cyclic Loading[J].Jour-nal of Nanjing Architecture and Civil Engineering In-stitute,1998(3):10-16,32.
[6]朱伯龙,吴明舜,张琨联.在周期荷载作用下,钢筋混凝土构件滞回曲线考虑裂面接触效应的研究[J].同济大学学报:自然科学版,1980,16(1):63-75.ZHU Bo-long,WU Ming-shun,ZHANG Kun-lian.AStudy of Hysteretic Curve of Reinforced ConcreteMembers Under Cyclic Loading Taking Account ofLocal Contact Effects of Cracked Section[J].Journalof Tongji University:Natural Science,1980,16(1):63-75.
[7]EL-BAHY A,KUNNATH S K,STONE W C,et al.Cumulative Seismic Damage of Circular Bridge Col-umn:Benchmark and Low-cycle Fatigue Tests[J].ACI Structural Journal,1999,96(4):633-641.
[8]EL-BAHY A,KUNNATH S K,STONE W C,et al.Cumulative Seismic Damage of Circular Bridge Col-umns:Variable Amplitude Tests[J].ACI StructuralJournal,1999,96(5):711-719.
[9]成文山,邹银生,程翔云.钢筋混凝土压弯构件恢复力特性的研究[J].湖南大学学报:自然科学版,1983,10(4):10-16.CHENG Wen-shan,ZOU Yin-sheng,CHENG Xiang-yun.Research on the Characteristics of RestoringForce for Reinforced Concrete Members with Flexureand Axial Force[J].Journal of Hunan University:Natural Science,1983,10(4):10-16.
[10]朱伯龙,张琨联.矩形及环形截面压弯构件恢复力特性的研究[J].同济大学学报:自然科学版,1981,17(2):1-10.ZHU Bo-long,ZHANG Kun-lian.A Study of Re-storing Force Characteristics of Reinforced ConcreteFlexural Members with a Constant Axial Load[J].Journal of Tongji University:Natural Science,1981,17(2):1-10.
[11]卫云亭,李德成.钢筋混凝土压弯构件恢复力特性的试验研究[J].西安冶金建筑学院学报,1980,12(4):8-15.WEI Yun-ting,LI De-cheng.Experiments on Re-storing Force of RC Beam-column Members[J].Jour-nal of Xi an Metallurgy Construction Institute,1980,12(4):8-15.
[12]MANDER J B,PRIESTLEY M J N,PARK R.Ob-served Stress-strain Behaviour of Confined Concrete[J].Journal of Structural Engineering,1988,114(8):1827-1849.
[13]周文峰.结构地震动力反应分析中的混凝土恢复力模型的适用性研究[D].重庆:重庆大学,2003.ZHOU Wen-feng.Applicability Study of HystereticModel of Concrete in Dynamic Response Analysis[D].Chongqing:Chongqing University,2003.
[14]WANG M L,SHAN S P.Reinforced Concrete Hys-teresis Model Based on the Damage Concept[J].Earthquake Engineering&Structural Dynamics,1987,15(8):993-1003.
[15]MANDER J B,PRIESTLEY M J N,PARK R.The-oretical Stress-strain Model for Confined Concrete[J].Journal of Structural Engineering,1988,114(8):1804-1826.
[16]过镇海,张秀琴.混凝土在反复荷载作用下的应力-应变全曲线[J].工业建筑,1981,3(9):14-17,13.GUO Zhen-hai,ZHANG Xiu-qin.Stress-strain Equa-tion of Concrete Under Cyclic Loads[J].IndustrialConstruction,1981,3(9):14-17,13.
[17]SAATCIOGLU S M,RAZVI S R.Strength and Duc-tility of Confined Concrete[J].Journal of StructuralEngineering,1992,118(6):1590-1607.
[18]SHEIKH S A,UZUMERI S M.Strength and Duc-tility of Tied Concrete Columns[J].Journal of Struc-tural Division,1980,106(5):1079-1102.
[19]PARK R,PRIESTLEY M J N,GILL W D.Ductilityof Square-confined Concrete Columns[J].Journal ofStructural Division,1982,108(4):929-950.
[20]袁锦根.方箍约束钢筋混凝土压弯构件延性与其滞回模型[J].铁道学报,1989,11(增1):12-16.YUAN Jin-gen.Ductility and Hysteresis Model forRC Flexural-compression Members with RectangularTie Confinement[J].Journal of the China Railway So-ciety,1989,11(S1):12-16.
[21]张有为.钢筋混凝土框架柱抗震破坏准则[D].重庆:重庆建筑大学,1996.ZHANG You-wei.Anti-seismic Failure Criterion forRC Frame Structures[D].Chongqing:ChongqingJianzhu University,1996.
[22]王敏.抗震钢筋混凝土柱的破坏准则及截面混凝土纤维的损伤累积性能研究[D].重庆:重庆大学,2005.WANG Min.Research on Criteria for Failure of theRC Column and the Damage Cumulation Behavior ofIts Concrete Fiber[D].Chongqing:Chongqing Univer-sity,2005.
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