IMPACT OF LEAD RUBBER BEARING BASE ISOLATION SYSTEMS ON BUILDING STRUCTURES DESIGNED AS PER EUROCODE 8

Mohammed Tamahloult, Mouloud Ouanani, Boualem Tiliouine

Abstract


Introduction: Seismic base isolation has been classified as a structural protection system designed to minimize the seismic forces transferred to a structure during an earthquake. This can be achieved through the use of various devices, such as elastomeric bearings, sliding bearings, and hybrid systems. Purpose of the study: The study aims to evaluate the impact of using lead rubber bearings (LRB) as a base isolation system in building structures. Methods: In order to achieve this, nonlinear dynamic analyses of a seven-story building with and without an isolation device at its base were performed using the Fast Nonlinear Analysis (FNA) algorithm. The building was designed according to Eurocode 8 (EC8) criteria and then subjected to analysis using data from two previous earthquake events. Results: It is concluded that the bilinear behavior assumption made in the design stage according to EC8 is appropriate. Additionally, implementing an isolation system with LRBs at the building foundation can significantly enhance building performance by reducing floor accelerations, inter-story drifts, and base shear responses. Furthermore, it is demonstrated that isolating a building at its base with LRBs effectively reduces internal forces due to both gravity and seismic loads.


Keywords


base isolation; LRB system; 3D nonlinear earthquake response analysis; Eurocode 8; bilinear hysteresis

Full Text:

PDF

References


AASHTO (2010). Guide specifications for seismic isolation design. 3rd edition. Washington, DC: AASHTO, 47 p.

Amanollah, F., Ostrovskaya, N., and Rutman, Y. (2023). Structural and parametric analysis of lead rubber bearings and effect of their characteristics on the response spectrum analysis. Architecture and Engineering, Vol. 8, No. 1, pp. 37–43. DOI: 10.23968/2500-0055-2023-8-1-37-43.

Asher, J. W., Hoskere, S. N., Ewing, R. D., Mayes, R. L., Button, M. R., and Van Volkinburg, D. R. (1997). Performance of seismically isolated structures in the 1994 Northridge and 1995 Kobe earthquakes. Building to Last, Leon Kempner, Jr. and Colin B. Brown, Editors, Proc. of Structures Congress XV, Published by ASCE, 1128-1132.

Attanasi, G., Auricchio, F., and Fenves, G. L. (2009). Feasibility assessment of an innovative isolation bearing system with shape memory alloys. Journal of Earthquake Engineering, Vol. 13, Issue S1, pp. 18–39. DOI: 10.1080/13632460902813216.

Cavdar, E. and Ozdemir G. (2022). Amplification in maximum isolator displacement of an LRB isolated building due to mass eccentricity. Bulletin of Earthquake Engineering, Vol. 20, pp. 607–631. DOI: 10.1007/s10518-021-01247-1.

Cheng, F. Y., Jiang, H., and Lou, K. (2008). Smart structures. Innovative systems for seismic response control. Boca Raton: CRC Press, 672 p.

SAP2000 Integrated software for structural analysis and design. (2000). Computers and Structures Inc. Computer software, Berkeley, California, USA.

Datta, T. K. (2010). Seismic analysis of structures. Singapore: John Wiley & Sons (Asia) Pte Ltd, 464 p.

Elghazouli, A. Y. (ed.). (2009). Seismic design of buildings to Eurocode 8. 2nd edition. Boca Raton: CRC Press, 363 p.

European Committee for Standardization (2004). Eurocode 8: Design of structures for earthquake resistance. Part 1: General rules, seismic actions and rules for buildings. Brussels: European Committee for Standardization, 230 p.

Gudainiyan, J. and Gupta, P. K. (2023). Effect of frequency content parameter of ground motion on the response of C‑shaped base‑isolated building. Asian Journal of Civil Engineering, Vol. 24, pp. 2973–2983. DOI: 10.1007/s42107-023-00688-0.

Hu, G.-J., Ye, K., and Tang, Z.-Y. (2023). Design and analysis of LRB base-isolated building structure for multilevel performance targets. Structures, Vol. 57, 105236. DOI: 10.1016/j.istruc.2023.105236.

Jain, S. K. (2004). Seismic isolation devices: a review. Bridge and Structural Engineer (IABSE), Vol. 34, Issue 2, pp. 19–47.

Kelly, J. M. (1997). Earthquake-resistant design with rubber. 2nd edition. London: Springer, 243 p. DOI: 10.1007/978-1-4471-0971-6.

Koo, G.-H., Lee, J.-H., Lee, H.-Y., and Yoo, B. (1999). Stability of laminated rubber bearing and its application to seismic isolation. KSME International Journal, Vol. 13, Issue 8, pp. 595–604. DOI: 10.1007/BF03184553.

Mayes, R. L. and Naeim, F. (2001). Design of structures with seismic isolation. In: Naeim, F. (ed.). The Seismic Design Handbook. Boston: Springer, pp. 723–755. DOI: 10.1007/978-1-4615-1693-4_14.

Ministry of Housing and Urban-Rural Development of the People’s Republic of China (2010). GB50011-2010. Code for seismic design of buildings. Beijing: Ministry of Housing and Urban-Rural Development of the People’s Republic of China, 228 p.

Mori, A., Moss, P. J., Carr, A. J., and Cooke, N. (1998). Behaviour of lead-rubber bearings. Structural Engineering and Mechanics, Vol. 6, No. 1, pp. 1–15. DOI: 10.12989/sem.1998.6.1.001.

Naeim, F. and Kelly, J. M. (1999). Design of seismic isolated structures: from theory to practice. New York: John Wiley & Sons, Inc., 304 p.

Tamahloult, M. and Tiliouine, B. (2023). 3D nonlinear seismic analysis and design of base-isolated buildings under near field ground motions. Građevinar, Vol. 75, No. 5, pp. 483–493. DOI: 10.14256/JCE.3548.2022.

Wilson, E. L. (2002). Three-dimensional static and dynamic analysis of structures. 3rd edition. Berkeley: Computers and Structures Inc., 423 p.


Refbacks

  • There are currently no refbacks.




     

ISSN: 2500-0055