钢筋混凝土空心墩延性变形能力分析
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摘要
基于纤维梁柱单元建立钢筋混凝土空心墩滞回分析模型,与试验结果对比验证模型准确性。在此基础上讨论纵筋配筋、壁厚、混凝土强度、剪跨比等因素对空心墩延性变形能力影响。研究表明:对剪跨比大于7.0的高墩,提高纵筋配筋率可有效增强其延性变形能力;而对于剪跨比小于5.0的中低墩,提高纵筋配筋率对其延性变形能力不利;在轴压比和纵筋配筋率一定情况下,空心墩壁厚对其延性变形能力影响不大,而保持轴力和纵筋配筋量不变时,增大壁厚可有效增加中低墩延性变形能力;且在固定轴力下,增大混凝土强度对提高中低墩延性变形能力效果显著。
The hysteretic analysis model of hollow reinforced concrete bridge piers was established on the basis of fiber beam-column elements and the accuracy of the model was verified by comparison with reliable experimental results.The influences of the longitudinal reinforcement,wall thickness,concrete compression strength and aspect ratio on the ductile deformability of hollow bridge piers were studied.It is found as follows: With high piers with the aspect ratio larger than 7.0,the ductile deformability can be effectively increased by raising the longitudinal reinforcement ratio;with low-height and medium-height piers with the aspect ratio less than 5.0,raising the longitudinal reinforcement ratio is unfavorable for the ductile deformability;the wall thickness has little influence on the ductile deformability of hollow piers with constant axial load ratios and longitudinal reinforcement ratios,however,when keeping the axial load and longitudinal reinforcement unchanged,pier wall thickening will better the ductile deformability of low-height and medium-height piers effectively;also,it is effective to increase the ductile deformability of low-height and medium-height hollow bridge piers by using high-strength concrete under constant axial loads.
The hysteretic analysis model of hollow reinforced concrete bridge piers was established on the basis of fiber beam-column elements and the accuracy of the model was verified by comparison with reliable experimental results.The influences of the longitudinal reinforcement,wall thickness,concrete compression strength and aspect ratio on the ductile deformability of hollow bridge piers were studied.It is found as follows: With high piers with the aspect ratio larger than 7.0,the ductile deformability can be effectively increased by raising the longitudinal reinforcement ratio;with low-height and medium-height piers with the aspect ratio less than 5.0,raising the longitudinal reinforcement ratio is unfavorable for the ductile deformability;the wall thickness has little influence on the ductile deformability of hollow piers with constant axial load ratios and longitudinal reinforcement ratios,however,when keeping the axial load and longitudinal reinforcement unchanged,pier wall thickening will better the ductile deformability of low-height and medium-height piers effectively;also,it is effective to increase the ductile deformability of low-height and medium-height hollow bridge piers by using high-strength concrete under constant axial loads.
引文
[1]庄卫林,刘振宇,蒋劲松.汶川大地震公路桥梁震害分析及对策[J].岩石力学与工程学报,2009,28(7):1377-1387.ZHUANG Wei-lin,LIU Zhen-yu,JIANG Jin-song.Earthquake-induced Damage Analysis of Highway Bridges in Wenchuan Earthquake and Countermeasures[J].ChineseJournal of Rock Mechanics and Engineering,2009,28(7):1377-1387.
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[17]聂利英,李建中,范立础.弹塑性纤维梁柱单元及其单元参数分析[J].工程力学,2004,21(3):15-20.NIE Li-ying,LI Jian-zhong,FAN Li-chu.Elastic-plastic Fiber Beam-column Element and its Parametric Analysis[J].Engineering Mechanics,2004,21(3):15-20.
[18]ZAHN F A.Design of Reinforced Concrete Bridge Col-umns for Strength and Ductility[D].Christchurch:Uni-versity of Canterbury,1985.
[19]MZRTINEZ-RUEDA J E,ELNASHAI A S.Confined Concrete Model under Cyclic Load[J].Materials and Structures,1997,30(3):139-147.
[2]梁智垚,李建中.桥梁高墩合理计算模型探讨[J].地震工程与工程振动,2007,27(2):91-98.LIANG Zhi-yao,LI Jian-zhong.Investigation on Rational Analytical Model of Tall Bridge Pier[J].Earthquake Engi-neering and Engineering Vibration,2007,27(2):91-98.
[3]PRIESTLEY M J N,PARK R.Strength and Ductility of Concrete Bridge Columns under Seismic Loading[J].ACI Structural Journal,1987,84(1):61-76.
[4]PINTO A V,MOLINA J,TSIONIS G.Cyclic Tests on Large-scale Models of Existing Bridge Piers with Rectan-gular Hollow Cross-Section[J].Earthquake Engineering and Structural Dynamics,2003,32(13):1995-2012.
[5]FARIA R,POUCA N V,DELGADO R.Simulation of the Cyclic Behavior of R/C Rectangular Hollow Section Bridge Piers via a Detailed Numerical Model[J].Journal of Earthquake Engineering,2004,8(5):725-748.
[6]YEH Y K,MO Y L,YANG C Y.Seismic Performance of Hollow Circular Bridge Piers[J].ACI Structural Journal,2001,98(6):862-871.
[7]YEH Y K,MO Y L,YANG C Y.Seismic Performance of Rectangular Hollow Bridge Columns[J].Journal of Struc-tural Engineering,ASCE,2002,128(1):60-68.
[8]MO Y L,WONG D C,MAEKAWA K.Seismic Perform-ance of Hollow Bridge Columns[J].ACI Structural Jour-nal,2003,100(3):337-348.
[9]MO Y L,YEH Y K,HSIEH D M.Seismic Retrofit of Hollow Rectangular Bridge Columns[J].Journal of Com-posites for Construction,ASCE,2004,8(1):43-51.
[10]CHENG C T,MO Y L,YEH Y K.Evaluation of As-built,Retrofitted,and Repaired Shear-critical Hollow Bridge Columns under Earthquake-type Loading[J].Jour-nal of Bridge Engineering,ASCE,2005,10(5):520-529.
[11]弓俊青,朱晞.钢筋混凝土空心圆端墩柱截面弯曲承载力和延性的分析研究[J].土木工程学报,2001,34(2):11-16.GONG Jun-qing,ZHU Xi.Study on Flexural Capacityand Ductility of Reinforced Concrete Piers with Hollow Round-nose Section[J].China Civil Engineering Journal,2001,34(2):11-16.
[12]郝文秀,阎贵平,钟铁毅,等.反复荷载作用下活性粉末混凝土空心桥墩力学性能的试验研究[J].铁道学报,2009,31(5):60-64.HAO Wen-xiu,YAN Gui-ping,ZHONG Tie-yi,et al.Experimental Study on the Mechanical Behaviour of Reac-tive Powder Concrete Piers with Hollow Cross-sections Subjected to Cyclic Loading[J].Journal of the China Rail-way Society,2009,31(5):60-64.
[13]CALVI G M,PAVESE A,RASULO A,et al.Experi-mental and Numerical Studies on the Seismic Response of R.C.Hollow Bridge Piers[J].Bulletin of Earthquake Engineering,2005,3(3):267-297.
[14]ISAKOVIC T,BEVC L,FISCHINGER M.Modeling the Cyclic Flexural and Shear Response of the R.C.Hol-low Box Columns of an Existing Viaduct[J].Journal of Earthquake Engineering,2008,12(7):1120-1138.
[15]SPACONE E,FILIPPOU F,TAUCER F F.Fiber Beam-column Model for Non-linear Analysis of R/C Frames:Part I.Formulation[J].Earthquake Engineer-ing and Structural Dynamics,1996,25(7):711-725.
[16]SPACONE E,FILIPPOU F,TAUCER F F.Fiber Beam-column Model for Non-linear Analysis of R/C Frames:Part II.Applications[J].Earthquake Engineer-ing and Structural Dynamics,1996,25(7):727-742.
[17]聂利英,李建中,范立础.弹塑性纤维梁柱单元及其单元参数分析[J].工程力学,2004,21(3):15-20.NIE Li-ying,LI Jian-zhong,FAN Li-chu.Elastic-plastic Fiber Beam-column Element and its Parametric Analysis[J].Engineering Mechanics,2004,21(3):15-20.
[18]ZAHN F A.Design of Reinforced Concrete Bridge Col-umns for Strength and Ductility[D].Christchurch:Uni-versity of Canterbury,1985.
[19]MZRTINEZ-RUEDA J E,ELNASHAI A S.Confined Concrete Model under Cyclic Load[J].Materials and Structures,1997,30(3):139-147.
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