Abstract
The complex response characterizing elastomeric isolation bearings is reproduced by employing a novel uniaxial hysteretic model that has been recently formulated and successfully implemented in OpenSees. Such a novel OpenSees material model offers several advantages with respect to differential models typically available in commercial software products for structural analysis, such as 3D-BASIS and CSi programs. Firstly, it is based on a set of only five model parameters that have a clear mechanical significance; such a property not only allows one to drastically simplify the parameters identification process, but it also allows the model to be used in practice. In addition, the model does not require numerical methods for the evaluation of the restoring force since the latter is computed by solving an algebraic equation. To encourage researchers and designers to adopt the proposed model for research and practical purposes, we demonstrate its accuracy by performing some numerical tests in OpenSees. In particular, we first employ the recently implemented model to compute the nonlinear dynamic response of a seismically base-isolated structure with elastomeric bearings and, subsequently, we compare the results with those obtained by modeling the seismic isolators with the OpenSees BoucWen uniaxial material model, that is one of the most popular and accurate hysteretic models currently available in OpenSees.
Highlights
Seismic isolation represents one of the most efficient techniques currently available to protect structures from earthquake excitations [1,2,3,4]
We first employ the recently implemented model to compute the nonlinear dynamic response of a seismically base-isolated structure with elastomeric bearings and, subsequently, we compare the results with those obtained by modeling the seismic isolators with the OpenSees BoucWen uniaxial material model, that is one of the most popular and accurate hysteretic models currently available in OpenSees
Material model and employed, for the first time, to simulate the behavior of elastomeric bearings typically adopted for the seismic protection of buildings and bridges
Summary
Seismic isolation represents one of the most efficient techniques currently available to protect structures from earthquake excitations [1,2,3,4]. Sophisticated numerical techniques, such as multi-steps [18] or Runge–Kutta methods [19], are exploited to solve, at each time step of a nonlinear time history analysis, the differential equation defining such models To overcome such limitations, a class of uniaxial phenomenological models has been formulated in [20,21]; subsequently, it has been specialized to derive two models which are respectively suitable for elastomeric and sliding bearings [22,23]. To allow designers and researchers to adopt the Algebraic Model and fully exploit its appealing features, we have recently developed a computationally efficient identification algorithm capable of calibrating the five model parameters from experimental or numerical tests [24] Such a model has been implemented in the Open System for Earthquake Engineering Simulation (OpenSees), that is a powerful object-oriented, open source software currently adopted by many researchers in the field of structural engineering [25]. In the third part (Section 4), the accuracy of the HystereticPoly material model is validated by means of numerical simulations
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