Seismic fragility analysis of multi-frame RC curved bridges with base isolation

Document Type : Original Article

Authors

1 خیابان افریقا نبش کوچه سپر پلاک 24

2 Assistant Professor, Faculty of Civil Engineering, Shahrood University of Technology, Iran

3 Instructor , Faculty of Civil Engineering, Pardisan university, mazandaran

4 Faculty of Engineering, Damghan University, Damghan, Iran

Abstract

Bridges are counted as one of the most important and vulnerable structures in the vital veins of every country. The abundance of the concrete box deck bridges with concrete arches on the one hand, and the complex dynamic behavior resulted from special geometric conditions of this class of bridges which have made them more vulnerable on the other hand, were aimed to be studied in this research. In this study, a model of a concrete box deck bridge with concrete arches and the appropriateness of using lead-rubber bearing system were examined, and ultimately, two states of the bridge with and without seismic isolation were assessed by fragility curves, and the amount of possible seismic damage have been obtained. The study results were analyzed by modeling the bridge in the CSi Bridge finite-element software in three dimensions and under the excitation of 100 pairs of real accelerogram and under nonlinear time-history analysis, and the responses of the elements were extracted. So that, compared to the state without seismic isolator, the maximum relative displacement in the model with seismic isolator has decreased by 55 and 28 percent in the longitudinal and transverse directions; respectively. Also , based on the result of modal analysis and comparison of t the vibration period, the results show a significant increase in the first to third period of vibration of bridges in the state with seismic isolation compared to the without seismic isolation. The results of studies indicate that In this bridges with seismic isolation have reduced the drift of columns significantly so that the seismic fragility of the bridge system has been reduced at different levels of damage.

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References

[1] FEMA-273 (1997). NEHRP Guidelines for the Seismic Rehabilitation of Buildings, Report No. FEMA-273, Building Seismic Safety Council Seismic Rehabilitation Project, Federal Emergency Management Agency, Washington, DC
[2] Khaloo, A.R., Kafimosavi. M. (2007). Enhancement of flexural design of horizontally curved prestressed bridges, Journal of bridge engineering, 12(5) 585-590.
[3] Tondini .N, Stojadinovic .B. (2012). Probabilistic seismic demand model for curved reinforced concrete bridges, Bulletin of Earthquake Engineering, 10(5) (2012) 1455-1479.
[4] Pahlavan, H., Zakeri,B, G. Amiri, G and Shaianfar ,M. (2015). Probabilistic vulnerability assessment of horizontally curved multiframe RC box-girder highway bridges, Journal of Performance of Constructed Facilities, 30(3) 04015038.
[5] Shaianfar, M., Abbasloo,A., Pahlavan ,H and Barkhordari,M.(2020). Probabilistic Seismic Vulnerability assessment Transport network infrastructure With emphasis on Curved and straight RC Box-Girder bridges Under multiple earthquakes.
[6] Naseri, A., Roshan, A. M., Pahlavan, H., & Amiri, G. G. (2020). Effects of curvature radius on vulnerability of curved bridges subjected to near and far-field strong ground motions. Structural Monitoring and Maintenance, 7(4), 367.
[7] Pahlavan, H., Naseri, A., Rafiei, S., & Baghery, H. (2018). Seismic Vulnerability Assessment of Horizontally Curved Multi frame RC Box-Girder Bridges Considering the Effect of Column Heights and Span Numbers. Doi: 10.22060/CEEJ.2017.12135.5130.
 [8] Caltrans (2010-2012). Personal communication with the P266 Fragility Project Advisory Panel members including Roblee, C., Yashinsky, M., Mahan, M., Shantz, T., Setberg, H., Turner, L., Sahs, S., Adams, D. T., Keever, M. (2011), California Department of Tra..
[9] Mander, J.B., Priestley, M.J., Park .R.,.(1988). Theoretical stress-strain model for confined concrete, Journal of structural engineering, 114(8) 1804-1826.
[10] Aviram, A., Mackie, K. and Stojadinovic, B. (2008). “Guidelines for Nonlinear Analysis of Bridge Structures in California,” Technical Report 2008/03, Pacific Earthquake Engineering Research Center, University of California, Berkeley.
[11] Megally, S. H., Silva, P. F., Seible, F. (2002). Seismic Response of Sacrificial Shear Keys in Bridge Abutments, Structural Systems Research Project SSRP-2001/24, University of California, San Diego, La Jolla, CA.
[12] Ramanathan, N.K. (2012), “Next generation seismic fragility curves for California bridges incorporating the evolution in seismic design philosophy,” Ph.D. thesis, Georgia Institute of Technology, Atlanta.
 [13] Shinozuka, M. Feng, M. Dong, Q. X. Uzawa, T and Ueda,T.(2000). Damage assessment of a highway network under scenario earthquakes for emergency response decision support, in: Smart Structures and Materials 2000: Smart Systems for Bridges, Structures, and Highways, International Society for Optics and Photonics, pp. 264-276.
[14] Choi, E. (2002). Seismic analysis and retrofit of mid-America bridges (Doctoral dissertation, School of Civil and Environmental Engineering, Georgia Institute of Technology).
[15] Zhang, J., Makris, N. (2002), Seismic response analysis of highway overcrossings including soil–structure interaction, Earthquake engineering & structural dynamics, 31(11) 1967-1991.
[16] No. 523, (2010). Guideline for Design and Practice of Base Isolation Systems in Buildings.Tehran: Islamic Republic of Iran Vice Presidency for Strategic Planning and Supervision, pp.18-39.
[17] Highway, A.A.o.S., et al,. (2010). Guide Specifications for Seismic Isolation Design. American Association of State Highway and Transportation Officials.
[18] Buckle, I.G., et al.(2006).Seismic isolation of highway bridges.
[19] Aashto. Lrfd, (2012). Bridge design specifications. American Association of State Highway and Transportation Officials, AASHTO: Washington, DC, USA.
[20] Mackie, K. R., & Stojadinović, B. (2005). Fragility basis for California highway overpass bridge seismic decision making. Pacific Earthquake Engineering Research Center, College of Engineering, University of California, Berkeley.
[21] Cornell, A. C., Jayaler, F., Hamburger, R. O., Foutch, A. D. (2002). Probabilistic Basis for 2000 SAC Federal Emergency Management Agency Steel Moment Frame Guidelines, Journal of Structural Engineering, 128(4), pp. 526-533.
[22] Naseri, A., Roshan, A. M., Pahlavan, H., & Amiri, G. G. (2020). Probabilistic seismic assessment of RC box-girder bridges retrofitted with FRP and steel jacketing. Coupled systems mechanics, 9(4), 359-379.
[23] Pahlavan, H., Mirza Goltabar Roshan, A., & Naseri, A. (2019). Analytical Fragility Curves for bridges subjected to near-fault and far-field ground motion (case study: Bell Emerson Bridge). Journal of Structural and Construction Engineering. Doi:10.22065/jsce.2019.161316.1739.
[24] Roshan, A. M. G., Naseri, A., & Pati, Y. M. (2018). Probabilistic evaluation of seismic vulnerability of multi-span bridges in north of Iran. Journal of Structural and Construction Engineering, 5(1), 36-54. Doi:10.22065/jsce.2017.68948.1009.
[25] Jeon, J. S., Shafieezadeh, A., & DesRoches, R. (2015). “System fragility curves for a long multi-frame bridge under differential support motions.” 12th International Conference on Applications of Statistics and Probability in Civil Engineering, Vancouver.

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History

  • Receive Date: 11 April 2021
  • Revise Date: 18 May 2021
  • Accept Date: 29 May 2021

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