Record Details

Influence of isolator characteristics on the response of base-isolated structures

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Influence of isolator characteristics on the response of base-isolated structures
 
Creator MATSAGAR, VASANT A
JANGID, RS
 
Subject mathematical models
seismic prospecting
linear systems
viscoelasticity
structural design
 
Description The influence of isolator characteristics on the seismic response of multi-story base-isolated structure is investigated. The isolated building is modeled as a shear type structure with lateral degree-of-freedom at each floor. The isolators are modeled by using two different mathematical models depicted by bi-linear hysteretic and equivalent linear elastic–viscous behaviors. The coupled differential equations of motion for the isolated system are derived and solved in the incremental form using Newmark’s step-by-step method of integration. The variation of top floor absolute acceleration and bearing displacement for various bi-linear systems under different earthquakes is computed to study the effects of the shape of the isolator hysteresis loop. The influence of the shape of isolator force-deformation loop on the response of isolated structure is studied under the variation of important system parameters such as isolator yield displacement, superstructure flexibility, isolation time period and number of story of the base-isolated structure. It is observed that the code specified equivalent linear elastic–viscous damping model of a bi-linear hysteretic system overestimates the design bearing displacement and underestimates the superstructure acceleration. The response of base-isolated structure is significantly influenced by the shape of hysteresis loop of isolator. The low value of yield displacement of isolator (i.e. sliding type isolation systems) tends to increase the superstructure accelerations associated with high frequencies. Further, the superstructure acceleration also increases with the increase of the superstructure flexibility.
 
Publisher Elsevier
 
Date 2009-04-22T09:02:23Z
2011-11-25T21:16:38Z
2011-12-26T13:08:45Z
2011-12-27T05:34:05Z
2009-04-22T09:02:23Z
2011-11-25T21:16:38Z
2011-12-26T13:08:45Z
2011-12-27T05:34:05Z
2004
 
Type Article
 
Identifier Engineering Structures 26(12), 1735-1749
0141-0296
http://dx.doi.org/10.1016/j.engstruct.2004.06.011
http://hdl.handle.net/10054/1207
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1207
 
Language en