Citation

Heins CP, Lin IC. Transp. Res. Rec. 1983; 903: 8-15.

Copyright

(Copyright © 1983, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

As a result of the 1964 Alaskan earthquake, the 1971 San Fernando earthquake, and, more recently, the 1978 Santa Barbara earthquake, bridge structures in the United States have undergone considerable destructive forces. These earthquakes caused--bridge professionals to reassess the design techniques that had been applied until that time for seismic design.

The seismic response of single and continuous curved steel composite box girder bridges has been predicted by an equivalent structure load method. This method has been developed by computing equivalent structural stiffnesses of the entire bridge for the three displacement directions (x, y, z) and rotation. These stiffnesses are then used to evaluate corresponding natural frequences (ωx, ωy, ωz, and ωt) by using a single degree of freedom system. The induced accelerations are then determined from the response spectrum curves. The re· suits of these analyses are then used to develop a series of empirical equations for direct design.

Language: en

Keywords

BEAMS AND GIRDERS - Curved; BRIDGES, BOX GIRDER; BRIDGES, STEEL; STRUCTURAL DESIGN - Mathematical Models