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Recent damaging earthquakes in the United States and abroad have demonstrated # K/#-S
the earthquake vulnerability of highway bridges that were designed to existing seismic WI54xu1M
codes. To address this inadequate performance, extensive research programs have been iPrAB*
carried out. These programs have advanced the state of the art to the point where a new dNz!2mbO
specification for seismic design is necessary to take advantage of new insight into K|.! )L
ground motion and geotechnical effects, improved performance criteria, and more 9R4q^tGR\
advanced analytical and design methodologies. LU@+ O12
The objective of this research was to enhance safety and economy through the { 4b8s%:!4
development of new load and resistance factor design (LRFD) specifications and commentary [
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for the seismic design of bridges. The research considered design philosophy Q3x.q z
and performance criteria, seismic loads and site effects, analysis and modeling, and ; J8 25CE
design requirements. The specifications are nationally applicable with provisions for XwdehyPhT2
all seismic zones and are intended to be integrated into the AASHTO LRFD Bridge vC5y]1QDd
Design Specifications. F6)/Iiv
The research was performed by a joint venture of the Applied Technology Council Y--Uo|H
and the Multidisciplinary Center for Earthquake Engineering Research. The report BmFs6{>~c
fully documents the methodology used to develop the recommended specifications. >HQ<KFA
The recommended specifications provided the technical basis for a stand-alone set of z>W'Ra6
provisions prepared by the ATC/MCEER Joint Venture titled “Recommended LRFD 0G/_"} @
Guidelines for the Seismic Design of Highway Bridges.” AASHTO will consider these cGe -|>:
provisions for adoption as a Guide Specification in 2002.
