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  AASHTO LRFD Seismic Bridge Design Jingsong LiuJuly 20, 2017  History of AASHTO Seismic Specifications ã 1981: ATC-6, Seismic Design Guidelines for Highway Bridges. ã 1983: Guide Specifications for Seismic Design of Highway Bridges, 1st Edition. ã 1991: the guidelines were formally adopted into the Standard Specifications for Highway Bridges, then revised and reformatted as Division I-A. ã 1994: Division I-A became the basis for the seismic provisions included in the AASHTO LRFD Bridge Design Specifications. The latest version is 7 th edition with 2016 Interim.  ã 2009: Guide Specifications for LRFD Seismic Bridge Design, 1 st Edition. An alternate to the seismic provisions in the AASHTO LRFD Bridge Design Specifications ã 2011: Guide Specifications for LRFD Seismic Bridge Design, 2 nd Edition, with 2012, 2014, and 2015 Interim Revisions.  ã 2007 (4 th Edition LRFD) and earlier: The seismic hazard maps have 10% probability of exceedance in 50 years (which is approximately equivalent to a 15% probability of exceedance in 75 years). This corresponds to a return period of approximately 475 years. 1 − (1 − ) 50 = 0.10;    = 0.0021   1/   = 475.06  Seismic Hazard Map and Response Spectrum

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Sep 10, 2019

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