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Seismic analysis of skewed highway bridges with intermediate supports
Author(s) -
Ghobarah A. A.,
Tso W. K.
Publication year - 1973
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290020304
Subject(s) - structural engineering , bridge (graph theory) , boulevard , ground motion , vibration , geology , skewness , induced seismicity , flexural strength , beam (structure) , beam bridge , engineering , seismology , physics , girder , civil engineering , acoustics , mathematics , medicine , statistics
Due to the damage suffered by many skewed highway bridges during the San Fernando earthquake, 1971, a study is made on the dynamic response of this type of bridge. Using a beam model capable of flexural and torsional deformations, the mode shapes and frequency equations are presented. Due to the skewness of the intermediate supports, coupled flexural and torsional vibrations are shown to be excited by the vertical component of ground motion An analysis is carried out for the Foothill Boulevard Undercrossing, S.E. Bridge in the San Fernando Valley, California which suffered damage to the intermediate supports. The results of the analysis correlate well with the observed damage pattern of the bridge.