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- W331526043 abstract "Seismic isolation for highway bridges employs various bearings, most of which possess nonlinear lateral stiffness. The nonlinear behavior may be approximated by using a model of a bi-linear parallelogram. For design purposes the slope of the diagonal of the parallelogram has been used as the lateral of the bearings(AASHTO Guide Specification for Seismic Isolation Design, 2000). The linearization enables the designer to obtain the effective period for isolation design. In this paper, a statistical study on the model of the bi-linear parallelogram is carried out to determine the effect of the shape of the parallelogram on the accuracy of isolation by using the AASHTO approach. Theoretical formulation is made and numerical results are obtained. For bearing with fat hysteretic loops (lateral force vs. lateral displacement relationships) the error in isolation design can be very large. Analyses were carried out on the lateral force and the bearing displacement by using a general bi-linear hysteretic model. Numerical results show quantitatively the underestimation of the peak values of acceleration and displacement by using the linearized approach. Following closely the approach used in the current AASHTO guidelines for isolation bearing design (i.e. to obtain an effective period for a nonlinear bearing) a set of expressions for estimating the effective stiffness and other properties of the bearings are formulated. They may be used to improve the AASHTO design for bearings with large characteristic strength and with large damping. While results presented herewith may be used to check the bridge bearing design by using the current AASHTO guidelines, the fundamental purpose of this FHWA sponsored research program is intended to pursue principles and guidelines for the next generation of bridge isolation systems including new and innovative devices and approaches. This paper addresses one of the issues on modeling of nonlinear bearing responses." @default.
- W331526043 created "2016-06-24" @default.
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- W331526043 date "2005-04-20" @default.
- W331526043 modified "2023-09-27" @default.
- W331526043 title "On Modeling of Nonlinear Responses of Seismic Isolation Bridge Bearings" @default.
- W331526043 hasPublicationYear "2005" @default.
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