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- W645817963 abstract "The seismic vulnerability of an existing two span reinforced concrete slab bridge with round columns as piers was studied for its retrofit design. First, the bridge design was checked by American Association of State Highway and Transportation Officials (AASHTO) seismic provisions, showing that the bridge is seismically weak in bending resistance and particularly shear resistance of its piers columns. Next, a push over analysis (POA) was performed, for which the target displacement was calculated by shear-displacement relationship for the center of gravity of the bridge deck. The rotations of plastic hinges in columns, obtained by POA were compared with the FEMA 356 acceptance levels, which confirmed the high vulnerability of the bridge. Finally, three various retrofit designs, including: 1) adding the strength and stiffness of pier columns by R/C jackets, 2) adding some steel diagonal elements in both lateral and longitudinal directions, and 3) fixing the deck to abutments connections in lateral direction to make it possible to use the abutment walls as shear walls, were considered and checked by both POA and Nonlinear Time History Analyses (NLTHA). The bridge specifications for NLTHA were defined based on FEMA 356 regulations by using the AASHTO design spectra. Several accelerograms, with the PGAs compatible with the level of seismic hazard in the site and the frequency contents compatible with the conditions of the bridge site soil, were used for NLTHA. The analyses results show that all three proposed retrofit designs are acceptable, however, the third method seems to be practically and economically more feasible." @default.
- W645817963 created "2016-06-24" @default.
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- W645817963 date "2008-01-01" @default.
- W645817963 modified "2023-09-23" @default.
- W645817963 title "Vulnerability Assessment of an Existing Highway Bridge by Pushover and 3-D Nonlinear Time History Analyses for its Seismic Retrofit" @default.
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