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Single Level Concrete Viaduct Pushover and Retrofitted Response Spectrum Analysis
The SR 99 Alaskan Way Viaduct was built in the 1950's. It runs along the downtown Seattle waterfront. The single level structure routes up a steep side slope, into a tunnel. The section of the viaduct under consideration varies from 90 to 78 feet wide and has 39'-9" span lengths. This paper will show how a typical existing transverse bent is analyzed. The material properties used in the 1950's is estimated. The bridge element plastic capacities are obtained using Response-2000 software. The plastic hinge capacity for shear and moment are compared with demand at the various displacements. A lateral force verses displacement curve is then generated to failure. Also shown are the steps involved in a 3-D dynamic response spectrum analysis of the structure retrofitted with new substructure elements and 1/2"; steel jacketing of the existing columns. The seismic design criteria followed the MCEER/ATC-49 "Recommended LRFD Guidelines for Seismic Design of Highways Bridges". It is found that the additional substructure successfully limits the displacements of the existing retrofitted members in the MCE below their plastic capacity.
Single Level Concrete Viaduct Pushover and Retrofitted Response Spectrum Analysis
The SR 99 Alaskan Way Viaduct was built in the 1950's. It runs along the downtown Seattle waterfront. The single level structure routes up a steep side slope, into a tunnel. The section of the viaduct under consideration varies from 90 to 78 feet wide and has 39'-9" span lengths. This paper will show how a typical existing transverse bent is analyzed. The material properties used in the 1950's is estimated. The bridge element plastic capacities are obtained using Response-2000 software. The plastic hinge capacity for shear and moment are compared with demand at the various displacements. A lateral force verses displacement curve is then generated to failure. Also shown are the steps involved in a 3-D dynamic response spectrum analysis of the structure retrofitted with new substructure elements and 1/2"; steel jacketing of the existing columns. The seismic design criteria followed the MCEER/ATC-49 "Recommended LRFD Guidelines for Seismic Design of Highways Bridges". It is found that the additional substructure successfully limits the displacements of the existing retrofitted members in the MCE below their plastic capacity.
Single Level Concrete Viaduct Pushover and Retrofitted Response Spectrum Analysis
Schettler, Jim (author) / Caywood, Cory (author)
Structures Congress 2005 ; 2005 ; New York, New York, United States
Structures Congress 2005 ; 1-10
2005-04-18
Conference paper
Electronic Resource
English
Single Level Concrete Viaduct Pushover and Retrofitted Response Spectrum Analysis
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