SEISMIC PERFORMANCE OF SINGLE-SPAN SIMPLY SUPPORTED AND CONTINUOUS SLAB-ON-GIRDER STEEL HIGHWAY BRIDGES

Investigators studied the seismic response of single-span simply supported and continuous slab-on-girder steel bridges. Linear elastic and nonlinear inelastic analyses are performed for various ground-acceleration inputs. Researchers found that bearings with higher stiffnesses that are closer to the edge of the bridge deck attract larger forces than other bearings, whereas bearings with small stiffness attract almost equal forces regardless of the width of the bridge. Assuming that the anchors of otherwise stable bearings are severed, sliding of the bridges is examined also. Apparently, narrower bridges with longer spans may have considerable sliding displacements and could fall off their supports if sufficient seat width is not provided. Wider bridges with shorter spans can survive severe earthquakes, especially in eastern North America. Undamaged bearings can sustain two- and three-lane continuous bridges with two spans of up to 40 and 50 m each, respectively, in earthquakes with 0.4g peak acceleration without any damage to columns. However, bridges with only 80 percent of these spans can survive similarly intense earthquakes if the bearings are damaged.

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  • English

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  • Accession Number: 00711639
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 30 1995 12:00AM