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http://dx.doi.org/10.12989/sss.2017.20.1.023

Sensitivity analysis of variable curvature friction pendulum isolator under near-fault ground motions  

Shahbazi, Parisa (Department of Civil and Environmental Engineering, Amirkabir University of Technology (Tehran Polytechnic))
Taghikhany, Touraj (Department of Civil and Environmental Engineering, Amirkabir University of Technology (Tehran Polytechnic))
Publication Information
Smart Structures and Systems / v.20, no.1, 2017 , pp. 23-33 More about this Journal
Abstract
Variable Curvature Friction Pendulum (VCFP) bearing is one of the alternatives to control excessive induced responses of isolated structures subjected to near-fault ground motions. The curvature of sliding surface in this isolator is varying with displacement and its function is non-spherical. Selecting the most appropriate function for the sliding surface depends on the design objectives and ground motion characteristics. To date, few polynomial functions have been experimentally tested for VCFP however it needs comprehensive parametric study to find out which one provides the most effective behavior. Herein, seismic performance of the isolated structure mounted on VCFP is investigated with two different polynomial functions of the sliding surface (Order 4 and 6). By variation of the constants in these functions through changing design parameters, 120 cases of isolators are evaluated and the most proper function is explored to minimize floor acceleration and/or isolator displacement under different hazard levels. Beside representing the desire sliding surface with adaptive behavior, it was shown that the polynomial function with order 6 has least possible floor acceleration under seven near-field ground motions in different levels.
Keywords
seismic isolation; variable curvature friction pendulum; sensitivity analysis; near-fault ground motion;
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1 Calvi, P.M. and Ruggiero, D.M. (2016), "Numerical modelling of variable friction sliding base isolators", Bull. Earthq. Eng., 14 (2), 549-568.   DOI
2 Fakhouri, M.Y. and Igarashi, A. (2013), "Multiple-slider surfaces bearing for seismic retrofitting of frame structures with soft first stories", Earthq. Eng. Struct. D., 42(1),145-161.   DOI
3 Fallahian, M., Khoshnoudian, F. and Loghman, V. (2015), "Torsionally seismic behavior of triple concave friction pendulum bearing", Adv. Struct. Eng., 18(12), 2151-2166.   DOI
4 FEMA, NEHRP. (2003), Recommended Provisions for Seismic Regulations for New Buildings and Other Structures (FEMA 450), Washington, DC, USA.
5 Fenz, D.M. and Constantinou., M.C. (2008a), Mechanical Behavior of Multi-Spherical Sliding Bearings, Multidisciplinary Center for Earthquake Engineering Research.
6 Fenz, D.M. (2008), Development, Implementation and Verification of Dynamic Analysis Models for Multi-spherical Sliding Bearings, ProQuest.
7 Fenz, D.M. and Constantinou, M.C. (2008b), "Modeling triple friction pendulum bearings for response-history analysis", Earthq. Spectra, 24(4), 1011-1028.   DOI
8 Gillich, G.R., Minda, A.A., GIillich, N., Jurcau, S.C. and Iavornic, C.M. (2012), "Robust friction pendulum with parameterized sliding surfaces", Proceedings of the 1st International Conference on Sustainable Development, Sustainable Chemical Industry, Pollution, Hazards and Environment.
9 Kong, D., Fan, F. and Zhi, X. (2014), "Seismic performance of single-layer lattice shells with VF-FPB", Int. J. Steel Struct., 14 (4), 901-911.   DOI
10 Lu, L.Y. and Hsu, C.C. (2013), "Experimental study of variablefrequency rocking bearings for near-fault seismic isolation", Eng. Struct., 46, 116-129.   DOI
11 Lu, L.Y., Lee, T.Y., Juang, S.Y. and Yeh, S.W. (2013), "Polynomial friction pendulum isolators (PFPIs) for building floor isolation: An experimental and theoretical study", Eng. Struct., 56, 970-982.   DOI
12 Lu, L.Y., Lee, T.Y. and Yeh, S.W. (2011), "Theory and experimental study for sliding isolators with variable curvature", Earthq. Eng. Struct. D., 40(14), 1609-1627.   DOI
13 Moeindarbari, H. and Taghikhany, T. (2014), "Seismic optimum design of triple friction pendulum bearing subjected to nearfault pulse-like ground motions", Struct. Multidiscip. O., 50(4), 701-716.   DOI
14 Mostaghel, N. and Tanbakuchi. J. (1983), "Response of sliding structures to earthquake support motion", Earthq. Eng. Struct. D., 11(6), 729-748.   DOI
15 Panchal, V.R. and Jangid, R.S. (2008a), "Variable friction pendulum system for near-fault ground motions", Struct. Control Health Monit., 15(4), 568-584.   DOI
16 Panchal, V.R. and Jangid, R.S. (2008b), "Variable friction pendulum system for seismic isolation of liquid storage tanks", Nucl. Eng. Des., 238 (6), 1304-1315.   DOI
17 Pranesh, M. and Sinha, R. (2000), "VFPI: an isolation device for aseismic design", Earthq. Eng. Struct. D., 29(5), 603-627.   DOI
18 Shahbazi, P., Moeindarbari, H. and Taghikhany, T. (2013), "Comparative study on the behavior of double variable curvature friction pendulum systems", Proceeding of the 13th World Conference on Seismic Isolation, Energy Dissipation and Active Vibration Control of Structures, Sendai, Japan, September 24-27.
19 Shahbazi, P. and Taghikhany, T. (2014), "Comparative study on the behavior of variable curvature friction pendulum isolator", Proceeding of the 2nd European Conference on Earthquake Engineering and Seismology (2ECEES), Istanbul, Turkey, August 24-29.
20 Tsai, C.S., Chiang, T.C. and Chen, B.J. (2003), "Finite element formulations and theoretical study for variable curvature friction pendulum system", Eng. Struct., 25(14),1719-1730.   DOI
21 Tsai, C.S., Chiang, T.C. and Chen, B.J. (2004), "Experimental study for multiple friction pendulum system", Proceedings of the 13th World Conference on Earthquake Engineering.
22 Sinha, R. and Pranesh, M. (1998), "FPS isolator for structural vibration control", Proceeding of the Int. Conf. on Theoretical, Applied, Computational and Experimental Mechanics (CD Volume).