Part 1. advent -- part 2. Definitions and notation -- part three. basic standards -- part four. research and layout necessities -- part five. Analytical versions and strategies -- part 6. starting place and abutment layout -- part 7. Structural metal parts -- part eight. bolstered concrete elements -- References -- Appendix A: Foundation-rocking research -- Appendix B: layout flowcharts.; Covers seismic layout for ordinary bridge forms and applies to non-critical and non-essential bridges. authorized as an alternative to the seismic provisions within the AASHTO LRFD Bridge layout standards. 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 approach. contains certain suggestions and statement on earthquake-resisting components and structures, worldwide layout suggestions, call for modeling, skill calculation, and liquefaction results. skill layout approaches underpin the advisor necessities' technique; contains prescriptive detailing for plastic hinging areas and layout necessities for ability security of these components that are supposed to no longer event damage.--
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Additional resources for AASHTO guide specifications for LRFD seismic bridge design.
All rights reserved. Duplication is a violation of applicable law. 3-14 AASHTO GUIDE SPECIFICATIONS FOR LRFD SEISMIC BRIDGE DESIGN should be aware of this error until the problem is corrected. The software error will likely have negligible effects on bridge analysis results because: • Fpga is approximately equal to Fa, • As is properly calculated and displayed in the tabulated design spectra, and • Bridges have fundamental periods greater than the effected period range (T < To). In lieu of using national ground motion maps referenced in these Guide Specifications, ground motion response spectra may be constructed on the basis of approved state ground motion maps.
If these conditions are satisfied, the abutments can be designed as part of the ERS and become an additional source for dissipating the bridge’s earthquake energy. In the longitudinal direction, the abutment may be designed to resist the forces elastically using the passive pressure of the backfill. In some cases, the longitudinal displacement of the deck will cause larger soil movements in the abutment backfill, exceeding the passive pressures there. This requires a more refined analysis to determine the amount of expected movement.
All rights reserved. Duplication is a violation of applicable law. 2- sec (Ss) with Seven Percent Probability of Exceedance in 75 yr (Approx. 1000-yr Return Period) and Five Percent Critical Damping © 2011 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law. 2-sec (Ss) with Seven Percent Probability of Exceedance in 75 yr (Approx. 1000-yr Return Period) and Five Percent Critical Damping © 2011 by the American Association of State Highway and Transportation Officials.
AASHTO guide specifications for LRFD seismic bridge design. by AASHTO