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Description / Abstract:
APPLICABILITY
This document presents Guide Specifications for the seismic
isolation design of highway bridges and is supplemental to the
AASHTO LRFD Bridge Design Specifications (the Design
Specifications) and the AASHTO Guide Specifications for
LRFD Seismic Bridge Design (LRFD Seismic). Fundamental requirements
for seismic isolation design are provided.
Information provided herein for bearings used in implementing
seismic isolation design are supplemental to Design Specifications,
Section 14. These provisions are necessary to provide a rational
design procedure for isolation systems incorporating the
displacements resulting from seismic response. If a conflict arises
between the provisions of these Guide Specifications and those in
the Design Specifications or LRFD Seismic, or both, the provisions
contained herein govern.
These Guide Specifications are intended for isolation systems
that are essentially rigid in the vertical direction and therefore
isolate in the horizontal plane only. In addition, these Guide
Specifications are intended for isolation systems that do not have
active or semi-active components.