Near-fault directivity pulse-like ground motion effect on high-speed railway bridge

Abstract

The vehicle-track-bridge (VTB) element was used to investigate how a high-speed railway bridge reacted when it was subjected to near-fault directivity pulse-like ground motions. Based on the PEER NAG Strong Ground Motion Database, the spatial analysis model of a vehicle-bridge system was developed, the VTB element was derived to simulate the interaction of train and bridge, and the elasto-plastic seismic responses of the bridge were calculated. The calculation results show that girder and pier top displacement, and bending moment of the pier base increase subjected to near-fault directivity pulse-like ground motion compared to far-field earthquakes, and the greater deformation responses in near-fault shaking are associated with fewer reversed cycles of loading. The hysteretic characteristics of the pier subjected to a near-fault directivity pulse-like earthquake should be explicitly expressed as the bending moment-rotation relationship of the pier base, which is characterized by the centrally strengthened hysteretic cycles at some point of the loading time-history curve. The results show that there is an amplification of the vertical deflection in the girder’s mid-span owing to the high vertical ground motion. In light of these findings, the effect of the vertical ground motion should be used to adjust the unconservative amplification constant 2/3 of the vertical-to-horizontal peak ground motion ratio in the seismic design of bridge.

Keywords

element / near-fault ground motion / directivity pulse / high-speed railway bridge / earthquake response

References

[1] HousnerG W, HudsonD E. The Port Hueneme earthquake of march 18, 1957 [J]. Bulletin of Seismological Society of America, 1958, 48(2): 163-168

[2] BoltB A. The San Fernando Valley, California earthquake of February 9, 1971: Data on seismic hazards [J]. Bulletin of Seismological Society of America, 1971, 61(2): 501-510

[3] BerteroV V, MahinS A, HerreraR A. Aseismic design implications of near-fault San Fernando earthquake records [J]. Earthquake Engineering and Structural Dynamics, 1978, 6(1): 31-42

[4] HeW-l, AgrawalA K. Analytical model of ground motion pulses for the design and assessment of seismic protective systems [J]. ASCE Journal of Structural Engineering, 2008, 134(7): 1177-1188

[5] MenunC, FuQ. An analytical model for near-fault ground motions and the response of SDOF systems [C]. Earthquake Engineening Research Institute. Proceedings of the 7th US National Conference on Earthquake Engineering, 2002, Boston, MA, USA, Mira Digital Publishing: 1477-1486

[6] MavroeidisG P, DongG, PapageorgiouA S. Near-fault ground motions, and the response of elastic and inelastic single-degree-of-freedom (SDOF) systems [J]. Earthquake Engineering & Structural Dynamics, 2004, 33(9): 1023-1049

[7] AlaviB, KrawinklerH. Consideration of near-fault ground motion effects in seismic design. [C]. New Zealand Society for Earthquake Engineering. Proceedings of the 12th World Conference on Earthquake Engineering. Auckland, New Zealand, A. A. Balkema, 2000

[8] UangC M, BerteroV VImplications of recorded earthquake ground motion on seismic design of building structures UCB/EERC-88/13 [R], 1988, Berkeley, Earthquake Engineering Research Center, University of California

[9] HallJ F, HeatonT H, HallingM W. Near-source ground motion and its effects on flexible buildings [J]. Earthquake Spectra, 1995, 11(4): 569-606

[10] TangY-c, ZhangJian. Response spectrum-oriented pulse identification and magnitude scaling of forward directivity pulses in near-fault ground motions [J]. Soil Dynamics and Earthquake Engineering, 2011, 31(1): 59-76

[11] YahyaabadiA, TehranizadehM. New scalar intensity measure for near-fault ground motions based on the optimal combination of spectral responses [J]. Scientia Iranica, 2011, 18(6): 1149-1158

[12] GillieJ L, AdrianR M, McDANIELC. Strength reduction factors for near-fault forward-directivity ground motions [J]. Engineering Structures, 2010, 32(1): 273-285

[13] KalkanE, KunnathS K. Effects of fling step and forward directivity on seismic response of buildings [J]. Earthquake Spectra, 2006, 22(2): 367-390

[14] ChenL-k, JiangL-z, WangL-p, LuoB-fu. Analysis of elasto-plastic seismic response of high-speed railway bridge with round-ended piers [J]. Journal of South China University of Technology (Natural Science), 2011, 39(6): 126-131

[15] ChenL-k, JiangL-z, YuZ-w, ZengZ-ping. Study on earthquake characteristics of high-speed railway simply-supported girder bridge [J]. Journal of Vibration and Shock, 2011, 30(12): 216-222

[16] ChenL-k, Jiang, YuZ-w, ZengZ-ping. Numerical analysis of seismic responses of high-speed railway bridge round-ended piers [J]. Journal of Hunan University (Natural Sciences), 2012, 39(4): 19-25

[17] ChenL-k, Jiang, ZengZ-p, LongW-guo. Numerical modeling and simulation on seismic performance of high-speed railway bridge system [J]. Noise and Vibration Worldwide, 2011, 42(10): 15-22

[18] LiaoW-I, LohC-H, LeeB-Han. Comparison of dynamic response of isolated and non-isolated continuous girder bridges subjected to near-fault ground motions [J]. Engineering Structures, 2004, 26(14): 2173-2183

[19] LiaoW-I, LohC-H, WanS, JeanW-Y, ChaiJ-Fu. Dynamic response of bridges subjected to near-fault ground motions [J]. Journal of Chinese Institute of Engineering, 2000, 23(4): 455-464

[20] LiuQ-h, YanG-p, ChenY-jun. Experimental studies on seismic behaviour of reinforced concrete bridge piers [J]. Journal of Northern Jiaotong University, 1996, 20(5): 518-521

[21] KalkanE, KunnathS K. Effects of fling step and forward directivity on seismic response of buildings [J]. Earthquake Spectra, 2006, 22(2): 367-390

[22] HoonC M, SaiidS, PaulS, SaadE A. Experimental study of reinforced concrete bridge columns subjected to near-fault ground motions [J]. ACI Structural Journal, 2010, 107(1): 3-12

[23] JuY-zhong, YanG-p, LiuLin. Experimental study on seismic behaviors of large-scale RC round-ended piers with low reinforcement ratio [J]. China Civil Engineering Journal, 2003, 36(11): 66-69

[24] ShenJ, TsaiM H, ChangK C, LeeG C. Performance of a seismically isolated bridge under near-fault earthquake ground motions [J]. Journal of Structure Engineering, ASCE, 2004, 130(6): 861-868

[25] SomervilleP G. Magnitude scaling of the near fault rupture directivity pulse [J]. Physics of the Earth and Planetary Interiors, 2003, 137(1): 201-212

[26] BakerJ. Quantitative classification of near-fault ground motions using recordlet analysis [J]. Bulletin of Seismological Society of America, 2007, 97(5): 1486-1501

[27] SomervilleP G, SmithN F, GravesR W, AbrahamsonN A. Modification of empirical strong motion attenuation relations to include the amplitude and duration effects of rupture directivity [J]. Seismological Research Letters, 1997, 68(1): 180-203

[28] ZhangN, XiaHe. Dynamic analysis of coupled vehicle-bridge system based on inter-system iteration method [J]. Computers & Structures, 2013, 114–115: 26-34

[29] GaoM-mang. Studies on train-track-bridge coupling vibration and train performance on high-speed railway bridges [J]. China Railway Science, 2002, 23(2): 135-137

[30] LiX-z, ZhuY, QiangS-zhong. Stochastic response analysis of train-bridge coupling system under high speed train loads excitation [J]. Journal of Vibration and Shock, 2012, 31(4): 168-172

[31] JoJ S, JungH J, KimH. Finite element analysis of vehicle-bridge interaction by an iterative method [J]. Structural Engineering & Mechanics, 2008, 30(2): 165-76

[32] YangY-b, YauJ-dar. Vehicle-bridge interaction element for dynamic analysis [J]. Journal of Structural Engineering, ASCE, 1997, 123(11): 1512-1518

[33] YangY-b, WuY-seng. A versatile element for analyzing vehicle-bridge interaction response [J]. Engineering Structures, 2001, 23(5): 452-469

[34] CheungY-s, AuF-T-K, CheungY-kai. Vibration of railway bridges under a moving train by using bridge-track-vehicle element [J]. Engineering Structures, 2001, 23(12): 1597-1606

[35] NielsenJ C O, AbrahamssonT J S. Coupling of physical and modal components for analysis of moving non-linear dynamic systems on general beam structures [J]. International Journal for Numerical Methods in Engineering, 1992, 33(9): 1843-1859

[36] YauJ-d, YangY-b, KuoS-rong. Impact response of high speed rail bridges and riding comfort of rail cars [J]. Engineering Structures, 1999, 21(9): 836-844

[37] JiangC, LinZ-min. Test and research on the ballast-free track structure for high-speed railway [J]. Chinese Railways, 2000, 7: 22-24

[38] HwangE S, NowakA S. Simulation of dynamic load for bridges [J]. Journal of Structural Engineering, ASCE, 1991, 117(5): 1413-34

[39] YangF, FonderG A. An iterative solution method for dynamic response of bridge-vehicle systems [J]. Earthquake Engineering & Structure Dynamics, 1996, 25(2): 195-215

[40] ChenL-kunSeismic responses of high-speed railway train-ballastless track-bridge system and train-running safety during earthquake [D], 2012, Changsha, China, School of Civil Engineering, Central South University

[41] ChenL-k, JiangL-z, YuZ-w, ZengZ-ping. Numerical analysis of seismic responses of high-speed railway bridge round-ended Piers [J]. Journal of Hunan University (Natural Sciences), 2012, 39(4): 19-25

[42] GB50111-2010Code for seismic design of railway engineering [S], 2010, Beijing, China Planning Press

[43] FEMA-356Prestandard and commentary for seismic rehabilitation of buildings [S], 2000, Washington DC, Federal Emergency Management Agency

[44] AbrahamsonN A, LitehiserJ J. Attenuation of vertical peak acceleration [J]. Bulletin of the Seismological Society of America, 1989, 79: 549-580

[45] NiaziM, BozorgniaY. Behaviour of near-source peak horizontal and vertical ground motions over SMART-l array, Taiwan [J]. Bulletin of the Seismological Society of America, 1991, 81: 715-732

[46] BroderickB M, ElnashaiA S, AmbraseysN N, BarrJ M, GoodfellowR G, HigaztE MThe Northridge (Ca1ifomia) earthquake of 17 January 1994: Observations, strong motion and correlative response analyses. Research Report ESEE-94/4 [R], 1994, London, Imperial College

[47] ElnashaiA S, PapazoglouA JVertical earthquake ground motion: Evidence, effects and simplified analysis procedures. ESEE 95-06 [R], 1995, London, Civil Engineering Dept, Imperial College