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http://dx.doi.org/10.12989/eas.2017.13.2.103

Vertical isolation of a structure based on different states of seismic performance  

Milanchian, Reza (Department of Structural Engineering, Science and Research branch, Islamic Azad University)
Hosseini, Mahmood (Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES))
Nekooei, Masoud (Department of Structural Engineering, Science and Research branch, Islamic Azad University)
Publication Information
Earthquakes and Structures / v.13, no.2, 2017 , pp. 103-118 More about this Journal
Abstract
In vertical seismic isolation (VSI), a building is partitioned intentionally by vertical layers into two dynamically different substructures for seismic response reduction. Initially, a 1-story frame was partitioned into two substructures, interconnected by viscous and visco-elastic links, and seismic responses of the original and the vertically isolated structures (VIS) were obtained, considering a large number of stiffness and mass ratios of substructures with respect to the original structure. Color contour graphs were defined for presentation and investigation of large amounts of output results. Dynamic characteristics of the isolated structures were studied by considering the non-classical damping of the system, and then the effects of viscous and visco-elastic link parameters on the modal damping ratios were discussed. On this basis, three states of mass isolation, interactional state, and control mass were differentiated. Response history analyses were performed by Runge-Kutta numerical method. In these analyses, interaction of isolation ratios and link parameters, on response control of VIS was studied and the appropriate ranges for link parameters as well as the optimal ranges for isolation ratios were suggested. Results show that by using the VSI technique, seismic response reduction up to 50% in flexible substructure and even more in stiff substructure is achievable.
Keywords
vertical seismic isolation; non-classical damping; viscous and visco-elastic dampers; Runge-Kutta method; response history analyses;
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1 Abdeddaim, M., A. Ounis, N. Djedoui and M. Shrimali (2016), "Pounding hazard mitigation between adjacent planar buildings using coupling strategy", J. Civ. Struct. Hlth. Monit., 6(3), 603-617.   DOI
2 Abdeddaim, M., A. Ounis, N. Djedoui and M. Shrimali (2016), "Reduction of pounding between buildings using fuzzy controller", Asian J. Civ. Eng. (BHRC), 17(7), 985-1005.
3 Bharti, S., S. Dumne and M. Shrimali (2010), "Seismic response analysis of adjacent buildings connected with MR dampers", Eng. Struct., 32(8), 2122-2133.   DOI
4 Dumne, S., M. Shrimali and S. Bharti (2017), "Earthquake performance of hybrid controls for coupled buildings with mr dampers and sliding base isolation", Asian J. Civ. Eng. (BHRC), 18(1), 63-97.
5 Klein, R., A. Todaro and I. Finne (1972), "Investigation of a method to stabilize wind induced oscillations in large structures", Am. Soc. Mech. Engineers, 95(2), 53-53.
6 Lee, D. and D.P. Taylor (2001), "Viscous damper development and future trends", Struct. Des. Tall Build., 10(5), 311-320.   DOI
7 Patel, C. and R. Jangid (2010), "Seismic response of dynamically similar adjacent structures connected with viscous dampers", The IES Journal Part A: Civil & Structural Engineering, 3(1), 1-13.   DOI
8 Nekooei, M. and M. Ziyaeifar (2008), "Spectral investigation on the seismic behaviour of vertical mass isolated structures against Earthquake", The 14th World Conference on Earthquake Engineering.
9 Nekooei, M. and M. Ziyaeifar (2008), "Vertical seismic isolation of structures", J. Appl. Sci., 8(24), 4656-4661.   DOI
10 Nigdeli, S.M. and G. Bekdas (2014), "Optimum tuned mass damper approaches for adjacent structures", Earthq. Struct., 7(6), 1071-1091.   DOI
11 Richardson, A., K.K. Walsh and M.M. Abdullah (2013), "Closed-form equations for coupling linear structures using stiffness and damping elements", Struct. Control Hlth. Monit., 20(3), 259-281.   DOI
12 Xu, Y., Q. He and J. Ko (1999), "Dynamic response of damper-connected adjacent buildings under earthquake excitation", Eng. Struct., 21(2), 135-148.   DOI
13 Zhang, W. and Y. Xu (1999), "Dynamic characteristics and seismic response of adjacent buildings linked by discrete dampers", Earthq. Eng. Struct. D., 28(10), 1163-1185.   DOI
14 Zhang, W. and Y. Xu (2000), "Vibration analysis of two buildings linked by Maxwell model-defined fluid dampers", J. Sound Vib., 233(5), 775-796.   DOI
15 Zhu, H., D. Ge and X. Huang (2011), "Optimum connecting dampers to reduce the seismic responses of parallel structures", J. Sound Vib., 330(9), 1931-1949.   DOI
16 Zhu, H. and Y. Xu (2005), "Optimum parameters of Maxwell model-defined dampers used to link adjacent structures", J. Sound Vib., 279(1), 253-274.   DOI
17 Ziyaeifar, M., S. Gidfar and M. Nekooei (2012), "A model for mass isolation study in seismic design of structures", Struct. Control Hlth. Monit., 19(6), 627-645.   DOI
18 Ziyaeifar, M. (2000), "Method of mass isolation in seismic design of structures", Proceeding of the 12th World Conference on Earthquake Engineering, Paper.