By Roy A Imbsen; American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures
This e-book covers seismic layout for common bridge varieties and applies to non-critical and non-essential bridges. it really is licensed as another to the seismic provisions within the AASHTO LRFD Bridge layout Specifications. This differs from the present approaches within the LRFD Specifications within the use of displacement-based layout techniques, rather than the normal force-based R-Factor strategy. It comprises specified information and statement on earthquake-resisting components and platforms, international layout options, call for modeling, capability calculation, and liquefaction results. ability layout strategies underpin the consultant requirements’ method; comprises prescriptive detailing for plastic hinging areas and layout requisites for skill defense of these parts that are meant to no longer event harm.
Included during this digital variation are the 2012 and 2014 intervening time Revisions. Following each one bankruptcy the Revisions are pointed out in addition to associated through the complete ebook the place to be had. See the "Interim Revisions" sections for an entire checklist of adjustments to every part.
intervening time Revisions 2012
desk of Contents
Section 1. Introduction
Section 2. Definitions and Notation
Section three. common Requirements
Section four. research and layout Requirements
Section five. Analytical versions and Procedures
Section 6. beginning and Abutment Design
Section 7. Structural metal Components
Section eight. bolstered Concrete Components
Read Online or Download AASHTO guide specifications for LRFD seismic bridge design PDF
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Additional info for AASHTO guide specifications for LRFD seismic bridge design
Seven percent probability of exceedance. The use of a 75-yr interval matches the design life prescribed by the AASHTO LRFD Bridge Design Specifications. It can be shown that an event with a seven percent probability of exceedance in 75 yr has a return period of about 1,000 yr. This earthquake is called the design earthquake. The value of the spectral acceleration parameters (As, SDS, and SD1) need not use more than two decimal places. 1 are for a damping ratio of five percent and do not include near field ground motion adjustments.
2. 1-1. 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. An error has been identified in the Spectral Response Accelerations SDS and SD1 results produced by the CD-ROM software.
1-8—Horizontal Peak Ground Acceleration Coefficient for Region 2 (PGA) with Seven Percent Probability of Exceedance in 75 yr (Approx. 1000-yr Return Period) © 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. 1000yr 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 Roy A Imbsen; American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures