A comparative seismic performance assessment of a multi-span bridge isolated with elastomeric and sliding isolation systems
Resumen
The remarkable performance of seismically isolated bridges in South America during the last two major seismic events has reflected the substantial increase in the adoption of base isolation in this type of infrastructure. In this paper, a non-isolated multi-span bridge was retrofitted for continued functionality adopting seismic isolation devices. With the aim of performing a comparative assessment of the most adopted base isolation techniques, the retrofitted bridge was analyzed using elastomeric and sliding isolation devices. In this case study, Lead Rubber Bearings (LRB) and Triple Friction Pendulum Bearings (TFPB) were selected as representative cases of elastomeric and sliding isolators, respectively. In the design of these isolation systems, the values of isolated periods, post-yield stiffness and yield force of both systems were set to be almost equals. This criterion was adopted for the purpose of comparing the unique effects of each type of isolator on the bridge seismic response. A series of nonlinear dynamic analyses were carried out considering both horizontal ground motion components to perform the comparative assessment. Numerical models that consider the bidirectional response and describe the different stages of motion of the isolators were adopted and then validated reproducing a series of benchmark tests. Upper and lower limit analyses were considered to gain a comprehensive understanding of the induced response by each isolation system. From the results, it is concluded that the LRB system induces a more uniform distribution of the seismic forces into the substructure; however, it experiences greater isolator displacements in comparison with the TFPB system.
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[2] M. Eröz and R. DesRoches, “A Comparative Assessment of Sliding and Elastomeric Seismic Isolation in a Typical Multi-Span Bridge”, Journal of Earthquake Engineering, vol 17, no. 5, pp. 637-657, Jul. 2013.
[3] F. Vilca, L. Quiroz and M. Torres, “Performance assessment of lead rubber bearing system and triple friction pendulum system at Piura's hospital, in Peru”, 16th World Conference on Earthquake, 16WCEE 2017, Santiago, Chile, Jan. 2017.
[4] Y. K. Wen, “Method for random vibration of hysteretic systems”, Journal of the Engineering Mechanics Division, Vol 102, no 2, pp. 249-263, Jun. 1976.
[5] I. Kalpakidis, M. Constantinou and A. Whittaker, “Modeling strength degradation in lead–rubber bearings under earthquake shaking”, Earthquake Engineering and Structural Dynamics, Vol. 39, Buffalo, USA, Oct. 2010.
[6] T. C. Becker, “Advanced Modeling of the Performance of Structures Supported on Triple Friction Pendulum Bearings”, University of California, Berkeley, USA, 2011.
[7] Y. J. Park, Y. K. Wen and A. Ang, “Random Vibration of Hysteretic Systems Under Bi-Directional Ground Motions”, Earthquake Engineering and Structural Dynamics, Vol. 14, pp. 543-557, 1986.
[8] AASHTO, “Guide Specifications for Seismic Isolation Design. 4th Edition”, Washington DC, USA, American Association of Highway and Transportation Officials, 2014.
[9] C. Trejo, “Desempeño Sísmico de un Puente Continuo Típico con Aisladores del tipo Elastomérico y Friccional Deslizante)”, National University of Engineering, Lima, Perú, 2021.
[10] S. Nagarajaiah, A. M. Reinhorn and M. Constantinou, “Nonlinear Dynamics of Three-dimensional Base Isolated Structures (3D-BASIS)”, National Center for Earthquake Engineering Research, New York, USA, Nov. 1989.
[11] C. Melchor, “Influencia de los Apoyos Elastoméricos en la Respuesta Sísmica de Puentes”, National University of Engineering, Lima, Perú, 2016.
[12] A. Aviram, K. R. Mackie and B. Stojadinović, “Guidelines for Nonlinear Analysis of Bridge Structures in California”, University of California, Berkeley, USA, Aug. 2008.
[13] S. A. Mahin and J. Lin, “Construction of Inelastic Response Spectra for Single-Degree-of-Freedom Systems”, University of California, Berkeley, USA, Jun. 1983.
[14] J. Mander, M. Priestley and R. Park, “Theoretical Stress-Strain Model for Confined Concrete”, Journal of Structural Engineering, Vol. 114, Sep. 1988.
[15] L. Dodd and J. Restrepo-Posada, “Model for Predicting Cyclic Behavior of Reinforcing Steel”, Journal of Structural Engineering, Vol. 121, Mar. 1995.
[16] ASCE/SEI 7-16, “Minimum Design Loads and Associated Criteria for Buildings and Other Structures”, Virginia, USA, American Society of Civil Engineers, 2016.
[17] Ministerio de Transportes y Comunicaciones, “Manual de Puentes”, Lima, Perú, Dec. 2018.
[18] M. Constantinou, A. S. Whittaker, D. M. Fenz and G. Apostolakis, “Seismic Isolation of Bridges”, University at Buffalo, Buffalo, USA, Jun. 2007.
[19] SENCICO, “Generation of synthetic accelerograms for the coast of Peru. Specific Interinstitutional Cooperation Agreement Between the General Institute of Research of the National University of Engineering and the National Training Service for the Construction Industry –SENCICO”, Lima, Perú, 2013.
[20] A. Sarlis and M. Constantinou, “Modeling Triple Friction Pendulum Isolators in Program Pap2000”, University at Buffalo, Buffalo, USA, Jun. 2010.
[21] W. McVitty, and M. Constantinou, “Property Modification Factors for Seismic Isolators: Design Guidance for Buildings”, MCEER Earthquake Engineering to Extreme Events, New York, USA, Jun. 2015.
[22] R. Tyler and W. Robinson, “High-Strain Tests on Lead-Rubber Bearings for Earthquake Loadings”, Bulletin of the New Zealand Society for Earthquake Engineering, Vol. 17, pp. 90-105, Jun. 1984.
[23] D. M. Fenz and M. Constantinou, “Development, Implementation and Verification of Dynamic Analysis Models for Multi-Spherical Sliding Bearings”, MCEER Earthquake Engineering to Extreme Events, New York, USA, Jun. 2008.
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