Dynamic Response of Fixed-base Core-tube and Base-isolated Frame Structure Subjected to Strong Earthquake Motions

Authors: Z.D. Yang, E.S.S. Lam

Abstract:

Considering the merits and limitations of energy dissipation system, seismic isolation system and suspension system, a new earthquake resistant system is proposed and is demonstrated numerically through a frame-core structure. Base isolators and story isolators are installed in the proposed system. The former “isolates" the frame from the foundation and the latter “separates" the frame from the center core. Equations of motion are formulated to study the response of the proposed structural system to strong earthquake motion. As compared with the fixed-base building system, the proposed structural system shows substantial reduction on structural response.

Keywords: Base Isolator, Core-tube, Isolated frame, Seismic Mitigation, Story Isolator

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1061721

References:

[1] M. D. Symans, F. A. Charney, A. S. Whittaker, M. C. Constantinou, C. A. Kircher, M. W. Johnson and R. J. McNamara, Energy Dissipation Systems for Seismic Applications: Current Practice and Recent Developments, J. Struct. Eng. 2008; 134(1) 3-21.
[2] M.C. Constantinou, P.Tsopelas, W. Hammel and A.N. Sigaher, Togglebrace- damper seismic energy dissipation system, J. Struct. Eng. 2001; 127(2) 105-112.
[3] T.S.K. Chung, E.S.S. Lam, B.Wu and Y.L. Xu, Retrofitting Reinforced Concrete Beam-column Joints by Hydraulic Displacement Amplification Damping System. Proceedings of 2007 ASCE Structures Congress. Long Beach, California; 2007.
[4] A. Whittaker and M. Constantinou, Seismic Energy Dissipation Systems for Buildings, in: Y. Bozorgnia, V.V. Bertero (Eds.), Earthquake Engineering From Engineering Seismology to Performance- Based Engineering, Taylor & Francis, London, 2006, pp. 716-744.
[5] J.M. Kelly, Aseismic base isolation: review and bibliography, Soil Dyn. Earthq. Eng.1986; 5(4) 202-216.
[6] R.L. Mayes and F. Naeim, Design of Structures with Seismic Isolation, in: F. Naeim (Eds.), The Seismic Design Handbook, second ed., Kluwer academic publishers, Boston, Dordrecht, London, 2001, pp.723-756.
[7] H.N. Li and X.X. Wu, limitations of height to width ratio for baseisolated buildings under earthquake, Struct. Design Tall Spec. Build. 2006; 15 277-287.
[8] T. Komuro, Y. Nishikawa, Y. Kimura and Y. Isshiki, Development and realization of base isolation system for high-rise buildings, J. Adv. Concr. Technol. 2005; 3(2) 233-239.
[9] L. Bo, S.S. Xiong and J.X. Tang, Wind effects on habitability of baseisolated buildings, J. Wind Eng. Ind. Aerodyn.2002; 90 1951-1958.
[10] M. Mezzi and A. Parducci, Conceptual seismic design and state-of-the art protection systems. 8th U.S. National Conference on Earthquake Engineering. San Francisco, California, USA; April 2006.
[11] Y. Nakamura, M. Saruta, A. Wada, T. Takeuchi, S. Hikone and T. Takahashi, Development of the core-suspended isolation system, Earthq. Eng. Struct. D. 2011; 40:429-447.
[12] D. Mar, L. Panian, R.A. Dameron, B.E. Hansen, S. Vahdani, D, Mitchell and J. Paterson, Performance-based seismic upgrade of a 14- story suspended slab building using state-of-the-art analysis and construction techniques, Proceedings of SEAOC 69th Annual Convention, Sacramento, California; 2000, pp.127-142.
[13] D. Mar, and S. Tipping, Smart frame story isolation: a new highperformance seismic technology, 9th U.S.-Japan Workshop on the Improvement of Structural Design and Construction Practices, Victoria, British Columbia, Canada, 2000.
[14] J.E. LUCO AND F.C.P. DE Barros, Control of the seismic response of a composite tall building modelled by two interconnected shear beams, Earthq. Eng. Struct. 27(1998) 205-223.
[15] P. S. Timoshenko and M.J. Gere, Theory of Elastic Stability, McGraw- Hill, New York, 1961.
[16] K.K. Kapur, Vibrations of a Timoshenko Beam, Using Finite-Element Approach, J. Acoust. Soc. Am. 40 (1966) 1058-1063.
[17] K.J. Bathe, Finite Element Procedure, Prentice-hall, Upper Saddle River, New Jersey, 1996.
[18] I. A. Karnovsky and O. I. Lebed, non-classical vibration of arches and beams: Eigenaluves and Egenfunctions, McGraw-hill, New York, 2004.
[19] Hutchinson, J.R. (2001), Shear Coefficients for Timoshenko Beam Theory, J. Appl. Mech., 68(1), 87-92.
[20] A.K. Chopra, Dynamics of structures: theory and applications to earthquake engineering, Upper Saddle River, New Jersey, 1995.
[21] T.K. Datta, Seismic analysis of structures,John Wiley & Sons (Asia) Pte Ltd., Singaore, 2010.
[22] H. Fujitani and T. Saito, Devices for aeismic isolation and response control, in: M. Higashino, and S. Okamoto (Eds.), Response Control and Seismic Isolation of Buildings, Taylor & Francis, London and New York, 2006, pp.3-37.
[23] C.P. Providakis, Effect of LRB isolators and supplemental viscous dampers on seismic isolated buildings under near-fault excitations, Eng. Struct. 30(2008) 1187-1198.
[24] P. Komodromos, Seismic isolation for earthquake-resistant structures, WIT press, Ashurst Lodge, Ashurst, Southampton, SO40 7AA, UK, 2000.
[25] W.X Cheng, D.H. Yan, G.Y. Kang and J.J. Jiang, Concrete structure Part II: concrete structure design, China architecture & building press, Beijing, 2003.
[26] GB50011-2010, Code for seismic design of buildings, Chinese Architecture & Building Press, Beijing, 2010.