Aashto Seismic Design Maps

The seismic design of highway infrastructures in most states in usa follows “guide specifications for lrfd seismic bridge design” of the american association of state highway and transportation officials (aashto) , but some states in higher seismic zones, such as california, have separate seismic performance criteria. Usgs earthquake hazards program seismic design maps for aashto guide specifications for lrfd seismic bridge design (2009) conterminous us. Then the usgs calculates gridded values of seismic design parameters based on usgs hazard values in accordance with design code procedures.

It is possible, but less convenient, to obtain seismic design parameter values directly from the usgs web. This document describes one of seven seismic design examples that illustrate how to apply aashto's seismic analysis and design requirements on actual different bridge types across the united states. Capacity), with the exception of walls that meet the aashto lrfd bridge design manual no seismic analysis provisions in aashto.

New seismic hazard maps the national earthquake ground motion map used in the existing aashto provisions is a probabilistic map of peak ground acceleration (pga) on rock that was developed by the u.s.

This document describes one of seven seismic design examples that illustrate how to apply aashto's seismic analysis and design requirements on actual different bridge types across the united states. Atc hazards by location tool; Geological survey (usgs) in 1990. The trb national cooperative highway research program's nchrp research report 949: