基于纤维模型的预应力混凝土桥墩滞回性能分析
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摘要
采用纤维模型分析方法,分析预应力钢束配筋率、纵向普通钢筋配筋率和箍筋配筋率对预应力混凝土桥墩滞回性能和抗震特性的影响。结果表明,预应力混凝土桥墩的预应力钢束配筋率和纵筋配筋率越大,桥墩的滞回环"捏拢效应"越明显,残余位移越小,耗能能力降低;预应力混凝土桥墩箍筋配筋率越大,滞回环面积越大,桥墩的延性越好,抗剪能力越强。研究结果可为预应力混凝土桥墩滞回性能分析提供理论依据。
The effects of the prestressed tendon reinforcement ratio,the ordinary longitudinal reinforcement ratio and the stirrup reinforcement ratio on the hysteretic behavior and seismic characteristics of the prestressed concrete bridge pier have been obtained with the fiber model analysis method.The analysis results show that for the prestressed concrete bridge pier: the greater the prestressed tendons reinforcement ratio and the ordinary longitudinal reinforcement are,the more obvious the pier′s hysteresis loop ″pinching effect″ is,the smaller the residual displacement is,the lower the energy dissipation capacity is;and the greater the stirrup reinforcement ratio is,the larger the hysteresis loop area is,the better the ductility of bridge piers is,the greater the shear capacity is.The research results will provide a theoretical basis for the hysteretic behavior analysis of the prestressed concrete pier.
The effects of the prestressed tendon reinforcement ratio,the ordinary longitudinal reinforcement ratio and the stirrup reinforcement ratio on the hysteretic behavior and seismic characteristics of the prestressed concrete bridge pier have been obtained with the fiber model analysis method.The analysis results show that for the prestressed concrete bridge pier: the greater the prestressed tendons reinforcement ratio and the ordinary longitudinal reinforcement are,the more obvious the pier′s hysteresis loop ″pinching effect″ is,the smaller the residual displacement is,the lower the energy dissipation capacity is;and the greater the stirrup reinforcement ratio is,the larger the hysteresis loop area is,the better the ductility of bridge piers is,the greater the shear capacity is.The research results will provide a theoretical basis for the hysteretic behavior analysis of the prestressed concrete pier.
引文
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[10]夏敏,余江滔,陆洲导,等.基于纤维模型的受火后混凝土框架的有限元分析[J].防灾减灾工程学报,2010,30(1):33-37.Xia M,Yu J T,Lu Zh D,et al.Finite element analy-sis of concrete frame after fire with fiber model[J].Journal of Disaster Prevention and Mitigation Engi-neering,2010,30(1):33-37.
[11]de Felice G.Assessment of the load-carrying capacityof multi-span masonry arch bridges using fibre beamelements[J].Engineering Structures,2009,31(8):1634-1647.
[12]Wang H L,Wang H,Qin S F,et al.Seismic analysisof prestressed bridge pier based on fiber section[J].Procedia Engineering,2011,21(10):354-362.
[13]谷音,卓卫东.基于IDA和纤维模型的高墩大跨连续刚构桥梁地震反应分析[J].土木工程与管理学报,2011,28(3):235-240.Gu Y,Zhuo W D.Study on seismic vulnerability oflong-span continuous rigid frame bridge with high pier[J].Journal of Civil Engineering and Management,2011,28(3):235-240.
[14]汪讯流.配置高强钢绞线无粘结混凝土柱复位性能的研究[D].北京:清华大学,2007.Wang X L.Research on re-centering capacity of rein-forced concrete columns rrinforced with unbonded highstrength strands[D].Beijing:Tsinghua University,2007.
[2]刘丰,魏红一,王志强.PRC桥墩抗震性能研究现状和展望[J].结构工程师,2007,23(5):48-51,92.Liu F,Wei H Y,Wang Zh Q.State of the art of seis-mic performance of PRC bridge piers[J].StructuralEngineer,2007,23(5):48-51,92.
[3]Ikeda S.Seismic behavior of reinforced concrete col-umns and improvement by vertical prestressing[C]∥Proceedings of the 13th FIP Congress on Challenges forConcrete in the Next Millennium:Amsterdam.Rot-terdam:A.A.Balkema,1998.
[4]Zatar W A MH.Reduced residual displacements ofpartially prestressed concrete bridge piers[C]∥12thWorld Conference on Earthquake Engineering.Auck-land:Upper Hutt,2000.
[5]Kwan W P,Billington S.Unbonded posttensionedconcrete bridge piers.Ⅰ:monotonic and cyclic analy-ses[J].Journal of Bridge Engineering,ASCE,2003,8(2):92-101.
[6]Kwan W P,Billington S.Unbonded posttensionedconcrete bridge piers.Ⅱ:seismic analyses[J].Journalof Bridge Engineering,ASCE,2003,8(2):102-111.
[7]Iemura H,Takahashi Y,Sogabe N.Development ofunbonded bar reinforced concrete structure[C]∥13thWorld Conference on Earthquake Engineering.Van-couver:[s.n.],2004.
[8]刘丰.节段拼装预应力混凝土桥墩拟静力试验和分析研究[D].上海:同济大学,2008.Liu F.Cyclic tests study and nonlinear finite elementanalysis on seismic behavior of prestressed precast seg-mental bridge piers[D].Shanghai:Tongji University,2008.
[9]王志强,葛继平,魏红一.东海大桥预应力混凝土桥墩抗震性能分析[J].同济大学学报(自然科学版),2008,36(11):1462-1500.Wang Zh Q,Ge J P,Wei H Y.Seismic performanceof prestressed concrete bridge column of east seabridge[J].Journal of Tongji University(Natural Sci-ence),2008,36(11):1462-1500.
[10]夏敏,余江滔,陆洲导,等.基于纤维模型的受火后混凝土框架的有限元分析[J].防灾减灾工程学报,2010,30(1):33-37.Xia M,Yu J T,Lu Zh D,et al.Finite element analy-sis of concrete frame after fire with fiber model[J].Journal of Disaster Prevention and Mitigation Engi-neering,2010,30(1):33-37.
[11]de Felice G.Assessment of the load-carrying capacityof multi-span masonry arch bridges using fibre beamelements[J].Engineering Structures,2009,31(8):1634-1647.
[12]Wang H L,Wang H,Qin S F,et al.Seismic analysisof prestressed bridge pier based on fiber section[J].Procedia Engineering,2011,21(10):354-362.
[13]谷音,卓卫东.基于IDA和纤维模型的高墩大跨连续刚构桥梁地震反应分析[J].土木工程与管理学报,2011,28(3):235-240.Gu Y,Zhuo W D.Study on seismic vulnerability oflong-span continuous rigid frame bridge with high pier[J].Journal of Civil Engineering and Management,2011,28(3):235-240.
[14]汪讯流.配置高强钢绞线无粘结混凝土柱复位性能的研究[D].北京:清华大学,2007.Wang X L.Research on re-centering capacity of rein-forced concrete columns rrinforced with unbonded highstrength strands[D].Beijing:Tsinghua University,2007.
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