Part 1. creation -- part 2. Definitions and notation -- part three. basic specifications -- part four. research and layout standards -- part five. Analytical versions and approaches -- part 6. origin and abutment layout -- part 7. Structural metal elements -- part eight. strengthened concrete elements -- References -- Appendix A: Foundation-rocking research -- Appendix B: layout flowcharts.; Covers seismic layout for commonplace bridge varieties and applies to non-critical and non-essential bridges. authorized as an alternative to the seismic provisions within the AASHTO LRFD Bridge layout necessities. Differs from the present systems within the LRFD requisites within the use of displacement-based layout systems, rather than the conventional force-based R-Factor procedure. contains specific tips and observation on earthquake-resisting parts and platforms, international layout suggestions, call for modeling, ability calculation, and liquefaction results. potential layout tactics underpin the advisor requisites' method; contains prescriptive detailing for plastic hinging areas and layout necessities for ability security of these components that are supposed to now not adventure damage.--
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Extra info for AASHTO guide specifications for LRFD seismic bridge design.
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.
Usually these types of geometric displacement constraints will be less restrictive than those resulting from structural considerations; for bridges on liquefiable sites, it may not be economical to prevent significant displacements from occurring. • Cracking, • Reinforcement yielding, • Major spalling of concrete, • Extensive yielding and local buckling of steel columns, • Global and local buckling of steel braces, and • Cracking in the bridge deck slab at shear studs. These conditions may require closure to repair the damage.
2. The construction of the response spectra shall follow the procedures described below and illustrated in Figure 1. S. Geological Survey (USGS) having a seven percent chance of exceedance in 75 yr. Values for PGA, Ss and S1 can be obtained from the maps in these Guide Specifications or from the USGS seismic parameters CD-ROM accompanying these Guide Specifications. The CD-ROM provides the coefficients by the latitude and longitude of the bridge site, or by ZIP code for the site. Use of the latitude and longitude is the preferred procedure when using the CD-ROM.