By Roy A Imbsen; American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures
This booklet covers seismic layout for average bridge kinds and applies to non-critical and non-essential bridges. it truly is licensed as an alternative to the seismic provisions within the AASHTO LRFD Bridge layout Specifications. This differs from the present strategies within the LRFD Specifications within the use of displacement-based layout strategies, rather than the normal force-based R-Factor strategy. It comprises particular information and observation on earthquake-resisting components and structures, worldwide layout suggestions, call for modeling, ability calculation, and liquefaction results. ability layout systems underpin the consultant requisites’ method; contains prescriptive detailing for plastic hinging areas and layout necessities for capability safeguard of these components that are supposed to now not adventure harm.
Included during this digital version are the 2012 and 2014 intervening time Revisions. Following each one bankruptcy the Revisions are pointed out in addition to associated through the complete publication the place on hand. See the "Interim Revisions" sections for an entire checklist of alterations to every part.
intervening time Revisions 2012
desk of Contents
Section 1. Introduction
Section 2. Definitions and Notation
Section three. normal Requirements
Section four. research and layout Requirements
Section five. Analytical types and Procedures
Section 6. origin and Abutment Design
Section 7. Structural metal Components
Section eight. bolstered Concrete Components
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Additional info for AASHTO guide specifications for LRFD seismic bridge design
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. 3-5 (1994a and 1994b) indicates that this is a reasonable assumption, except for short-period structures for which it is nonconservative. 3. Type 2—Essentially Elastic Substructure with a Ductile Superstructure This category applies only to steel superstructures. The ductility is achieved by constructing ductile elements as part of the cross-frames of a steel slab-on-girder bridge superstructure.
2 is desired. 1 and its commentary. x Site-Specific Ground Motion Response Analysis: A sitespecific ground response analysis is used to determine the influence of local ground conditions on the design ground motions. The analysis is generally based on the assumption of a vertically propagating shear wave though more complex analyses can be conducted if warranted. A site-specific ground motion response analysis is typically used to evaluate the influence of “non-standard” soil profiles on ground response to the seismic hazard level.
2475-yr return period), and therefore should not be used. The coefficient obtained for the USGS/AASHTO Seismic Hazard Maps are based on a uniform seismic hazard. , 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.