Numerical Study on Bridge Elastomeric Bearings Subjected To Large Shear Strains With Emphasis on Local Tension


Abstract eng:
Steel-laminated elastomeric bearings are common structural components used in isolated ed stru structures. Elastomeric bearings are proven to be excellent isolators rs of vibrations for bridges, as they shift the fundamenta mental period of the structure and increase the damping, hence mitigate ate seismic sei effects. However, recent failures of isolators in South America and Asia (the 2010 Chile Earthquake in Chile, thee 2011 Great Tohoku earthquake in Japan) have shownn that the methods for the design of elastomeric bearings require improvemen vements. Under seismic excitations, global and local tensile stresses might be developed within the elastomer of bearings, causing ausing fluctuations of their vertical load. An overall study of the international literature proved an acknowledged gap regarding arding the response of elastomeric bearings underr variable varia axial loads. This paper investigates the response of steel-lamin aminated elastomeric bearings through extensive numerical erical modelling calibrated against published numerical and experimental ental rresults. Analyses with cyclic shear displacements ents and an variable axial loads were performed to better understand their ir resp response, i.e. their damping and stiffness at large strains and also the development of local tensile stresses. The hyperelastic lastic Ogden model is used to simulate the mechanical nical properties p of the elastomeric material of the bearing. The study identified identi the response of steel-laminated elastomeric ic bearings bear and the development of local tensile stresses under multiple ple cycles cy of loading - unloading, variable combined ned lo loads and different boundary conditions. Experimental tests are being conducted at the University of Surrey, in orderr for tthe results of this paper to be validated.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 1021.:
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