Effects of Near Fault and Far Fault Ground Motions on Nonlinear Dynamic Response and Seismic Improvement of Bridges

Mohammad Hajali, Abdolrahim Jalali, Ahmad Maleki

Abstract


In this study, the dynamic response of bridges to earthquakes near and far from the fault has been investigated. With respect to available data and showing the effects of key factors and variables, we have examined the bridge’s performance. Modeling a two-span concrete bridge in CSI Bridge software and ability of this bridge under strong ground motion to near and far from fault has been investigated. Nonlinear dynamic analysis of time history includes seven records of past earthquakes on models and it was observed that the amount of displacement in the near faults is much greater than the distances far from faults. Bridges designed by seismic separators provide an acceptable response to a far from fault. This means that in bridges using seismic separators, compared to bridges without seismic separators, Acceleration rate on deck, base shearing  and the relative displacement of the deck are decrease. This issue is not seen in the response of the bridges to the near faults. By investigating earthquakes near faults, it was observed that near-fault earthquakes exhibit more displacements than faults that are far from faults. These conditions can make seismic separators critical, so to prevent this conditions FDGM should be used to correct the response of these bridges. Based on these results, it can be said that the displacement near faults with forward directivity ground motion is greater than far from faults. So that by reducing the distance from the faults, the maximum value of the shearing and displacement of the deck will be greater.


Keywords


Nonlinear Dynamic Response of Bridge; Seismic Improvement of Bridges; the Near and Far Fault; Forward Directivity Ground Motions.

References


Papageorgiou, A. S., (2014)" Near-Fault and Far-Field Strong Ground-Motion Simulation for Earthquake Engineering Applications Using the Specific Barrier Model ", Proc. of the Structural Engineers World Congress, San Francisco, California,pp:18-23.doi: https://doi.org/10.1061/(ASCE)ST.1943-541X.0000097.

Anderson, J. C, BertroV. V., (1987) “Uncertainties in Establishing Design Earthquake” J. Sbrch. Eng. ASCE 113 (8): 1709-1724.doi: https://doi.org/10.1061/(ASCE)0733-9445(1987)113:8(1709).

Lio W.I, Loh. C. H, Wan. S., Jean. W.Y, & chai J.F., (2000) “Dynamic Responses of Bridges Subjected to near fault Ground Motins”. Journal of the Chinese Institute of engineers. 23 (3) 455-464.doi: https://doi.org/10.1080/02533839.2000.9670566.

Faghihinejad, Farideh, (2012), Investigation of the decay of adjacent bridges under strong ground movements in the near-fault zone, non-governmental higher education non-profit institutions, Tehran University of Science and Culture, Faculty of Civil Engineering, Master's thesis.

Ismailpour, Mitra, (2012), Investigation of the bridge collapses under the influence of strong ground movements in the near-fault zone, North-Amur Non-profit and Non-governmental higher education institute - Faculty of Engineering, Master's thesis.

Rafael Cerqueira Silva,2015, Near earthquake faults on long bridges, Volume 191, 29 May 2015, Pages 48-60.

Cofer.W, Rodriguez-Marek.A,(2007), DYNAMIC RESPONSE OF BRIDGES TO NEAR-FAULT, FORWARD DIRECTIVITY GROUND MOTIONS, Washington State Transportation Center (TRAC), Washington State University, Pullman, WA 99164-2910.doi: https://doi.org/10.1061/(ASCE)1090-0241(2006)132:12(1611).

Johnson, S.Y., Dadisman, S.V., Childs, J.R., and Stanley, W.D. (1999). “Active tectonics of the Seattle Fault and Central Puget Sound, Washington : Implications for earthquake hazards.” Geological Society of America Bulletin, 111(7): 1042-1053.doi: https://doi.org/10.1130/0016-7606(1999)111<1042:ATOTSF>2.3.CO;2.

Kowalsky, M.J., Priestley, M.J.N. (2000). “Improved Analytical Model for Shear Strength of Circular Reinforced Concrete Columns in Seismic Regions,” ACI Structural Journal, 97(3), 388-397. Serial URL: http://www.concrete.org/PUBS/JOURNALS/SJHOME.ASP.

Krawinkler, H. and Alavi, B. (1998). "Development of improved design procedures for near-fault ground motions." Proceedings, SMIP98 Seminar on Utilization of Strong Motion Data Oakland, CA: 21- 41.

Y.L.MO,Y.K.YEH,. (2006). " Seismic Behavior of Shear Critical Hollow Bridge Columns " Department of Civil and Environmental Engineering, University of Houston, Houston, Texas.doi: https://doi.org/10.1061/40889(201)40.

Mavroeidis, G. P. and Papageorgiou, A. S. (2003). “A mathematical representation of near-fault ground motions.” Bulletin of the Seismological Society of America, 93(3): 1099-1131.doi: https://doi.org/10.1785/0120020100.

Pacific Earthquake Engineering Research Center (PEER). (2000). PEER Strong Motion Database [Online]. http://peer.berkeley.edu/smcat/.

Pratt, T. L., S. Y. Johnson, C. J. Potter, W. J. Stephenson, and C. A. Finn (1997). “Seismic reflection images beneath Puget Sound, western Washington State: the Puget Lowland thrust sheet hypothesis,” J. Geophys. Res., 102, 27,469–27,489.doi: https://doi.org/10.1029/97JB01830.


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DOI: 10.28991/cej-0309186

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Copyright (c) 2018 Mohammad Hajali, Abdolrahim Jalali, Ahmad Maleki

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