整体式桥台曲线箱梁桥的动力特性研究
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摘要
针对整体式桥台曲线箱梁桥的结构特点,运用结构分析软件ANSYS的APDL语言实现多模态反应谱法的自动迭代,以简化该类桥梁的动力特性分析。对该类桥梁的计算模型及影响其动力特性的主要参数进行了分析,通过动态时程分析法比较了迭代多模态反应谱法的可行性和准确性。结果表明:该类桥梁不存在纯粹某一方向的振型;1阶横弯、1阶纵弯和3阶竖弯分别对横、纵和竖向的振型贡献最大;1阶横弯和1阶纵弯频率受台后土及桩侧土密实度的影响最大,其次是地震激励频率和桥宽;3阶竖弯频率基本不受各种参数的影响;迭代多模态反应谱法可以作为该类桥梁抗震计算的一种估算手段。
In order to simplify analysis of the dynamic characteristics of the integral abutment curved box girder bridge,automatic iteration of the multimode modal response spectrum(MMRS) was realized by APDL language of the structure analysis software ANSYS according to the bridge's structural characteristics.The computation model and the main parameters influencing dynamic characteristics of the bridge were discussed.The availability and precision of the iterative MMRS method were examined by the time-history analysis.The result shows that(1) there is no pure modal shape in a certain direction;(2) 1st order transverse bending,1st order longitudinal bending and 3rd order vertical bending are most contribution to respective modes;(3) vibration frequencies of 1st order transverse bending and 1st order longitudinal bending are most influenced by compactness of back-abutment and pile-around soil,frequency of seismic excitation and the width of bridge are the next influencing parameters;(4)diversified parameters effect on frequency of 3rd order vertical bending rarely.The feasibility and veracity of the iterative MMRS are validated by the time-history analysis.The iterative MMRS can be used as an estimating method of seismic analysis for the bridge.
In order to simplify analysis of the dynamic characteristics of the integral abutment curved box girder bridge,automatic iteration of the multimode modal response spectrum(MMRS) was realized by APDL language of the structure analysis software ANSYS according to the bridge's structural characteristics.The computation model and the main parameters influencing dynamic characteristics of the bridge were discussed.The availability and precision of the iterative MMRS method were examined by the time-history analysis.The result shows that(1) there is no pure modal shape in a certain direction;(2) 1st order transverse bending,1st order longitudinal bending and 3rd order vertical bending are most contribution to respective modes;(3) vibration frequencies of 1st order transverse bending and 1st order longitudinal bending are most influenced by compactness of back-abutment and pile-around soil,frequency of seismic excitation and the width of bridge are the next influencing parameters;(4)diversified parameters effect on frequency of 3rd order vertical bending rarely.The feasibility and veracity of the iterative MMRS are validated by the time-history analysis.The iterative MMRS can be used as an estimating method of seismic analysis for the bridge.
引文
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[24]彭大文,汪新惠,洪锦祥.无伸缩缝桥梁的动力特性研究[J].地震工程与工程振动,2003,23(4):95-99.PENG Dawen,WANG Xinhui,HONG Jingxiang.Research of Dy-namic Characteristics of Jointless Bridges[J].Earthquake Engineer-ing and Engineering Vibration,2003,23(4):95-99.
[25]黄庆伟.高墩大跨曲线连续刚构桥非线性地震反应分析[D].成都:西南交通大学,2004.HUANG Qianwei.Nonlinear Earthquake Response Analysis ofCurved Continuous Rigid Frame Bridge with High Piers andLong Spans[D].Chendu:Southwest Jiaotong University,2004.
[2]DICLELI M.A Rational Design Approach for Prestressed-con-crete-girder Integral Bridges[J].Engineering Structures,2000(22):230-245.
[3]CROUSE C B,HUSHMAND B,MARTIN G R.DynamicSoil-structure Interaction of a Single-span Bridge[J].Earth-quake Engineering and Structure Dynamic,1987(15):711-729.
[4]KARANTZIKIS M,SPYRAKOS C C.Seismic Analysis of BridgesIncluding Soil-abutment Interaction[C]//Proceedings of the 12thWorld Congress on Earthquake Engineering.New Zealand:NewZealand Society for Earthquake Engineering,2000:2471.
[5]GOEL R K.Earthquake Characteristics of Bridges with IntegralAbutments.Journal of Structure Engineering[J].ASCE,1997,123(11):1435-1443.
[6]彭大文,洪锦祥,郭爱民,等.无伸缩缝桥梁的动力特性计算与试验研究[J].地震工程与工程振动,2005,25(2):72-76.PENG Dawen,HONG Jinxiang,GUO Aimin,et al.DynamicAnalysis and Field-test of Jointless Bridge[J].EarthquakeEngineering and Engineering Vibration,2005,25(2):72-76.
[7]彭大文,汪新惠,洪锦祥.无伸缩缝桥梁的动力特性研究[J].地震工程与工程振动,2003,23(4):95-99.PENG Dawen,WANG Xinhui,HONG Jinxiang.Research onDynamic Characteristics Jointless Bridges[J].Earthquake En-gineering and Engineering Vibration,2003,23(4):95-99.
[8]汪新惠.整体式桥台的无伸缩缝桥梁动力特性和地震反应研究[D].福州:福州大学,2003.WANG Xinhui.Dynamic Performance of Jointless Integral Abut-ment Bridges[D].Fuzhou:Fuzhou University,2003.
[9]林志平,彭大文.整体式桥台桥梁设计与实践的发展现状[J].世界桥梁,2005(4):13-17.LIN Zhiping,PENG Dawen.Development Status of Integral Abut-ment Bridges in Design and Practice[J].World Bridges,2005(4):13-17.
[10]彭大文,林志平,洪锦祥.无伸缩缝桥梁的研究与实践[J].公路,2006(8):53-61.PENG Dawen,LIN Zhiping,HONG Jinxiang,Research andPractice for Jointless Bridges[J].Highway,2006(8):53-61.
[11]中华人民共和国交通部.JTG/T B02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.P.R.China.Ministry of Communications.JTG/T B02-01-2008 Guidelines for Seismic Design of Highway Bridges[S].Beijing:China Communications Press,2008.
[12]邵容光,夏淦.混凝土弯梁桥[M].北京:人民交通出版社,1991:254-255.SHAO Rongguang,XIA Gan.Concrete Curved-beam Bridge[M].Bejing:China Communications Press,1991:254-255.
[13]BARKER R M,DUNCAN J M K,ROJIANI K B,et al.Manuals for the Design of Bridge Foundation,NCHRP Rep.343[R].Washington,D.C.:Transportation ResearchBoard,National Research Council,1991.
[14]American Petroleum Institute.API RP2A-WSD RecommendedPractice for Planning,Designing,and Constructing Fixed Off-shore Platforms-working Stress Design[S].20th ed.Wash-ington,D.C.:American Petroleum Institute,1993.
[15]BROWN D A,O’NEILL M W,HOIT M,et al.Static andDynamic Lateral Loading of Pile Groups,NCHRP Rep.461[R].Washington,D.C.:Transportation Research Board,National Research Council,2001.
[16]DICLELI M,ALBHAISI S,MANSOUR M Y.Static Soil-structure Interaction Effects in Seismic-isolated Bridges[J].Practice Periodical on Structural Design and Construction,2005,10(1):22-33.
[17]范立础,李建中,王君杰.高架桥梁抗震设计[M].北京:人民交通出版社,2001.FAN Lichu,LI Jianzhong,WANG Junjie.Seismic Design forUrban Viaduct[M].Beijing:China Communications Press,2001.
[18]黄雨,唐益群,叶为民,等.桩土体系的有效应力地震反应计算方法研究[J].地下空间,2000,20(3):166-170.WANG Yu,TANG Yiqun,YE Weimin,et al,Investigationon Calculation Method for Seismic Response of Effective Stressin Pile-soil System[J].Underground Space,2000,20(3):166-170.
[19]刘香.考虑土-结构相互作用的排架结构抗震性能研究[D].西安:西安建筑科技大学,2003.LIU Xiang.Studies on Anti-earthquake Capacity of Bent Struc-ture under the Interaction of Ground-structure[D].Xi’an:Xi’an University of Architecture and Technology,2003.
[20]王克海,李茜.基于模态分析的Push-over方法在桥梁抗震分析中的应用[J].铁道学报,2006,28(2):79-84.WANG Kehai,LI Qian.Mode-based Push-over Method Ap-plied to Aseismatic Analysis of Bridge[J].Journal of the Chi-na Railway Society,2006,28(2):79-84.
[21]M J N普瑞斯特雷,F塞勃勒,G M卡尔维.桥梁抗震设计与加固[M].北京:人民交通出版社,1997.PRIESTLEY M J N,SEIBEL F,CALVI G M,Seismic Designand Reinforcement of Bridges[M].Beijing:China Communica-tions Press,1997.
[22]贺健.曲线梁桥的减隔震分析[D].上海:同济大学,2000.HE Jian.Study on Seismic Response Reduction and Isolation ofCurved Beam Bridge[D].Shanghai:Tongji University,2000.
[23]单德山,李乔.曲线弯梁桥振动分析方法[J].土木工程学报,2005,38(10):61-65.SHAN Deshan,LI Qiao.Analytical Method of Vibration Analy-sis for Curved-girder Bridges[J].Journal of Civil Engineer-ing,2005,38(10):61-65.
[24]彭大文,汪新惠,洪锦祥.无伸缩缝桥梁的动力特性研究[J].地震工程与工程振动,2003,23(4):95-99.PENG Dawen,WANG Xinhui,HONG Jingxiang.Research of Dy-namic Characteristics of Jointless Bridges[J].Earthquake Engineer-ing and Engineering Vibration,2003,23(4):95-99.
[25]黄庆伟.高墩大跨曲线连续刚构桥非线性地震反应分析[D].成都:西南交通大学,2004.HUANG Qianwei.Nonlinear Earthquake Response Analysis ofCurved Continuous Rigid Frame Bridge with High Piers andLong Spans[D].Chendu:Southwest Jiaotong University,2004.
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