Impact of LRFD Seismic Bridge Design for Georgia

DesRoches, R.; Tien, Iris; Yang, C S Walter; Georgia Institute of Technology. School of Civil and Environmental Engineering

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Impact of LRFD Seismic Bridge Design for Georgia

2018-11-01
By DesRoches, R. ; Tien, Iris ; Yang, C S Walter

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Creators:

DesRoches, R. ; Tien, Iris ; Yang, C S Walter

DesRoches, R. ; Tien, Iris ; Yang, C S Walter Less -
Corporate Creators:

Georgia Institute of Technology. School of Civil and Environmental Engineering
Corporate Contributors:

United States. Federal Highway Administration ; Georgia. Department of Transportation. Office of Performance-Based Management & Research

United States. Federal Highway Administration ; Georgia. Department of Transportation. Office of Performance-Based Management & Research Less -
Subject/TRT Terms:

[+]

AASHTO LRFD Design Bents Bridge Design Earthquake Resistant Design Girder Bridges Lap Splice Load And Resistance Factor Design MSC Steel Bridges MSSS Concrete Bridges MSSS Slab Bridges MSSS Steel Bridges Pile-to-bent Connections Risk Assessment Seismic Hazard And Risk Analyses Transverse Reinforcement
Publication/ Report Number:

FHWA-GA-19-1420
Resource Type:

Tech Report
Geographical Coverage:

Georgia ; United States

Georgia ; United States Less -
Edition:

Final; January 2015–November 2018
Corporate Publisher:

Georgia. Dept. of Transporation. Office of Performance-Based Management and Research
Abstract:

The objectives of this study were to evaluate the impact of AASHTO LRFD seismic detailing on Georgia bridges under various seismic hazards. Significant findings from this study are the following: 1. The analytical results show significant influences of lap-splice length, rebar size, and transverse reinforcement (TR) spacing on the ductility behavior of lap-spliced columns. 2. For multi-span simply supported concrete girder bridges, results for Site Classes A, B, and C show a lower than 25% probability of exceeding Limit State 1 with non-seismic TR spacing. For Site Class D, 3-in. TR spacing is recommended in Regions 1 and 2 to reduce the risk of exceeding Limit State 1 (initial longitudinal rebar yield) from 40.15% to 13.16% and 29.38% to 8.07%, respectively. For Site Class E, 3-in. TR spacing is recommended in Regions 1, 2, and 3 to reduce the risk of exceeding Limit State 1 from 68.53% to 33.87%, 51.39% to 19.88%, and 42.37% to 14.36%, respectively. 3. For multi-span continuous steel girder bridges, the 9-ft lap splice can be provided at the base of the column. 3-in. TR spacing is recommended to reduce the risk of exceeding Limit State 1 by 20-30% for Seismic Zone 2. Lap splice is not recommended for Zone 2. 4. For multi-span simply supported steel girder bridges, having one stirrup in each direction (two total legs in each plane) compared to two stirrups in each direction (four total legs in each plane) show less than a 2% difference in probability of exceeding defined limit states. Regions 1 and 2 for Site Classes B and C; Regions 1-3 for Site Class D; Regions 1-5 for Site Class E show relatively high risk values (>25%) of exceeding Limit State 1, and based on parametric studies of seismic risk from other bridge classes, reducing TR spacing is recommended. 5. For pile bents, for Seismic Zone 1, at least 12-in. embedment of piles into bents is the only requirement. The pile embedment length does not significantly affect the pile lateral strength.
Format:

PDF
Funding:

P.I. NO. 0013421
Collection(s):

US Transportation Collection
Main Document Checksum:

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urn:sha256:e5a19dd7c992ff53ec23b27ebccde417dccb6aa34f172655ed56748a646726de
Download URL:

https://rosap.ntl.bts.gov/view/dot/40888/dot_40888_DS1.pdf
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Impact of LRFD Seismic Bridge Design for Georgia

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