Part 1. advent -- part 2. Definitions and notation -- part three. common necessities -- part four. research and layout specifications -- part five. Analytical types and techniques -- part 6. starting place and abutment layout -- part 7. Structural metal parts -- part eight. strengthened concrete parts -- References -- Appendix A: Foundation-rocking research -- Appendix B: layout flowcharts.; Covers seismic layout for ordinary bridge kinds and applies to non-critical and non-essential bridges. licensed as another to the seismic provisions within the AASHTO LRFD Bridge layout requirements. Differs from the present tactics within the LRFD requisites within the use of displacement-based layout systems, rather than the conventional force-based R-Factor process. contains certain suggestions and observation on earthquake-resisting components and structures, worldwide layout ideas, call for modeling, skill calculation, and liquefaction results. means layout methods underpin the consultant requirements' method; contains prescriptive detailing for plastic hinging areas and layout standards for potential security of these parts that are supposed to now not event damage.--
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Extra info for AASHTO guide specifications for LRFD seismic bridge design.
These ground motion hazard maps depict probabilistic ground motion and spectral response for seven percent probability of exceedance in 75 yr. 2. 2) can be used to account for local site effects. Site-specific procedures consist of a site-specific hazard analysis, a site-specific ground motion response analysis, or both. 2 is desired. Information about one or more active seismic sources for the site has become available since the development of the 2002 USGS data that were used to develop the 2006 USGS/AASHTO Seismic Hazard Maps, and the new seismic source information will result in a significant change of the seismic hazard at the site.
1987), good design practice dictates the use of the design alternative in which the intermediate substructures, between the abutments, are designed to resist all seismic loads, if possible. This ensures that in the event abutment resistance becomes ineffective, the bridge will still be able to resist the earthquake forces and displacements. In such a situation, the abutments provide an increased margin against collapse. © 2009 by the American Association of State Highway and Transportation Officials.
Cap beam and superstructure hinging). Permissible elements depicted in Figure 2 that do not meet either criterion above may be used only with approval by the Owner. Examples of elements that do not fall in either of the two permissible categories depicted in Figure 3 shall be considered not recommended. However, if adequate consideration is given to all potential modes of behavior and potential undesirable failure mechanisms are suppressed, then such systems may be used with the Owner’s approval.
AASHTO guide specifications for LRFD seismic bridge design. by AASHTO