反应谱离散性对梁桥概率地震需求预计的影响
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摘要
以一座三跨非规则钢筋混凝土连续梁桥为例,选择2组实际地震波作为输入地面运动,通过IDA分析探讨地震波反应谱的离散度对于梁桥结构概率地震需求预计的影响,得到以下结论:实际地震波的反应谱离散度与桥梁结构概率地震需求预计的离散度密切相关;针对基于概率理论的PBEE和PBSD,合理的选择实际地震波进行动力分析,可以使地震需求的概率分布更加符合实际情况,提高概率地震需求预计、易损性曲线等计算结果的精确性和计算效率。
A three-span regular continuous RC girder highway bridge and two bins of real accelerograms were selected for incremental dynamic analysis to study the correlation of the dispersions of response spectra of earthquake ground motions and probabilistic seismic demand assessments of bridge structures.It is found that the dispersions of seismic demands are closely related to the dispersions of response spectra of selected ground motions.The rational selection of real earthquake ground motions to be rationally chosen for dynamic analysis can make the probability distribution of seismic demands in accordance with the real situation and improve the computational precision and efficiency of the probabilistic seismic demand assessment and fragility curve for performance-based earthquake engineering and seismic design of bridges based on probability theory.
A three-span regular continuous RC girder highway bridge and two bins of real accelerograms were selected for incremental dynamic analysis to study the correlation of the dispersions of response spectra of earthquake ground motions and probabilistic seismic demand assessments of bridge structures.It is found that the dispersions of seismic demands are closely related to the dispersions of response spectra of selected ground motions.The rational selection of real earthquake ground motions to be rationally chosen for dynamic analysis can make the probability distribution of seismic demands in accordance with the real situation and improve the computational precision and efficiency of the probabilistic seismic demand assessment and fragility curve for performance-based earthquake engineering and seismic design of bridges based on probability theory.
引文
[1]Lee T-H,Mosalam K M.Probabilistic seismicevaluation of reinforced concrete structural componentsand systems[R].Pacific Earthquake EngineeringResearch Center,College of Engineering,University ofCalifornia,Berkeley,2006.
[2]Kwon O-S,Elnashai A.The effects of material andground motion uncertainty on the seismic vulnerabilitycurves of RC structure[J].Engineering Structure,2006,28:289-303.
[3]Lee T H,Mosalam K M.Probabilistic fiber elementmodeling of reinforced concrete structures[J].Computers and Structures,2004,82(27):2285-2299.
[4]Hancock J,Bommer J J.Using spectral matchedrecords to explore the influence of strong-motionduration on inelastic structural response[J].SoilDynamics and Earthquake Engineering,2007,27:291-299.
[5]Jun D H.Seismic response of R/C structures subjectedto simulated ground motions compatible with designspectrum[J].The Structural Design of Tall and SpecialBuildings,2013,22:74-91.
[6]Cimellaro G P,Reinhorn A M,DAmbrisi A,et al.Fragility Analysis and seismic record selection[J].ASCE Journal of Structural Engineering,2011,137(3):379-390.
[7]Bhatt C,Bento R.Comparison of nonlinear staticmethods for the seismic assessment of plan irregularframe buildings with non seismic details[J].Journal ofEarthquake Engineering,2012,16(1):15-39.
[8]Demartinos K,Faccioli E.Probabilistic seismicperformance assessment of classes of buildings usingphysics-based simulations and ground-motion predictionequations[J].Journal of Earthquake Engineering,2012,16(1):40-60.
[9]American Society of Civil Engineering.Seismic designcriteria for structures,systems,and components innuclear facilities[S].ASCE/SEI 43-05,Reston,VA,2005.
[10]陈亮,李建中.地震波的反应谱谱形对RC梁桥结构非线性地震反应的影响[J].工程力学,2011,28(10):86-92,110.Chen L,Li J Z.The influence of response spectralshape of earthquake ground motions on nonlinearseismic responses of reinforced concrete girder bridgestructures[J].Engineering Mechanics,2011,28(10):86-92,110.
[11]Haselton C B,Baker J W.Accounting for groundmotion spectral shape characteristics in structuralcollapse assessment through an adjustment for epsilon[J].ASCE Journal of Structural Engineering.2011,137(3):332-344.
[12]Catalan A,Benavent-Climent A,Cahis X.Selection andscaling of earthquake records in assessment of structures inlow-to-moderate seismicity zones[J].Soil Dynamics andEarthquake Engineering,2010,30:40-49.
[13]Baker J W.Conditional mean specrum:a tool forground motion selection[J].ASCE Journal ofStructural Engineering,2011,137(3):322-331.
[14]Baker J W,Vector-valued ground motion intensitymeasures for probabilistic seismic demand analysis[D].Stanford:Stanford University,2005.
[15]OpenSEES[OL].http://OpenSEES.berkeley.edu,2012.
[16]Kunnath S K.Application of the PEER PBEEMethodology to the I-880 Viaduct[R].PacificEarthquake Engineering Research Center,University ofCalifornia,Berkeley,2007.
[17]Kevin M,Bozidar S.Seismic demands of performance-based design of bridges[R].Pacific EarthquakeEngineering Research Center,College of Engineering,University of California,Berkeley,2003.
[18]Shome N,Cornell C A,Bazzurro P,et al.Earthquakes,records and nonlinear responses[J].Earthquake Spectral,1998,14(3):469-500.
[19]Vamvatsikosa D,Cornell C A.Applied incrementaldynamic analysis[J].Earthquake Spectra,2004,20(2):523-553.
[20]Vamvatsikosa D.Performing incremental dynamicanalysis in parallel[J].Computers and Structures,2011,89(1/2):170-180.
[2]Kwon O-S,Elnashai A.The effects of material andground motion uncertainty on the seismic vulnerabilitycurves of RC structure[J].Engineering Structure,2006,28:289-303.
[3]Lee T H,Mosalam K M.Probabilistic fiber elementmodeling of reinforced concrete structures[J].Computers and Structures,2004,82(27):2285-2299.
[4]Hancock J,Bommer J J.Using spectral matchedrecords to explore the influence of strong-motionduration on inelastic structural response[J].SoilDynamics and Earthquake Engineering,2007,27:291-299.
[5]Jun D H.Seismic response of R/C structures subjectedto simulated ground motions compatible with designspectrum[J].The Structural Design of Tall and SpecialBuildings,2013,22:74-91.
[6]Cimellaro G P,Reinhorn A M,DAmbrisi A,et al.Fragility Analysis and seismic record selection[J].ASCE Journal of Structural Engineering,2011,137(3):379-390.
[7]Bhatt C,Bento R.Comparison of nonlinear staticmethods for the seismic assessment of plan irregularframe buildings with non seismic details[J].Journal ofEarthquake Engineering,2012,16(1):15-39.
[8]Demartinos K,Faccioli E.Probabilistic seismicperformance assessment of classes of buildings usingphysics-based simulations and ground-motion predictionequations[J].Journal of Earthquake Engineering,2012,16(1):40-60.
[9]American Society of Civil Engineering.Seismic designcriteria for structures,systems,and components innuclear facilities[S].ASCE/SEI 43-05,Reston,VA,2005.
[10]陈亮,李建中.地震波的反应谱谱形对RC梁桥结构非线性地震反应的影响[J].工程力学,2011,28(10):86-92,110.Chen L,Li J Z.The influence of response spectralshape of earthquake ground motions on nonlinearseismic responses of reinforced concrete girder bridgestructures[J].Engineering Mechanics,2011,28(10):86-92,110.
[11]Haselton C B,Baker J W.Accounting for groundmotion spectral shape characteristics in structuralcollapse assessment through an adjustment for epsilon[J].ASCE Journal of Structural Engineering.2011,137(3):332-344.
[12]Catalan A,Benavent-Climent A,Cahis X.Selection andscaling of earthquake records in assessment of structures inlow-to-moderate seismicity zones[J].Soil Dynamics andEarthquake Engineering,2010,30:40-49.
[13]Baker J W.Conditional mean specrum:a tool forground motion selection[J].ASCE Journal ofStructural Engineering,2011,137(3):322-331.
[14]Baker J W,Vector-valued ground motion intensitymeasures for probabilistic seismic demand analysis[D].Stanford:Stanford University,2005.
[15]OpenSEES[OL].http://OpenSEES.berkeley.edu,2012.
[16]Kunnath S K.Application of the PEER PBEEMethodology to the I-880 Viaduct[R].PacificEarthquake Engineering Research Center,University ofCalifornia,Berkeley,2007.
[17]Kevin M,Bozidar S.Seismic demands of performance-based design of bridges[R].Pacific EarthquakeEngineering Research Center,College of Engineering,University of California,Berkeley,2003.
[18]Shome N,Cornell C A,Bazzurro P,et al.Earthquakes,records and nonlinear responses[J].Earthquake Spectral,1998,14(3):469-500.
[19]Vamvatsikosa D,Cornell C A.Applied incrementaldynamic analysis[J].Earthquake Spectra,2004,20(2):523-553.
[20]Vamvatsikosa D.Performing incremental dynamicanalysis in parallel[J].Computers and Structures,2011,89(1/2):170-180.
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