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The Effects of Seismic Disturbances on the Golden Gate Bridge.

PB272279

Publication Date	1976
Personal Author	Baron, F.; Arikan, M.; Hamati, R. E.
Page Count	182
Abstract	This report deals with the effects of seismic disturbances on the Golden Gate Bridge. It is a supplement to the studies made during the design phase of the bridge. The results that are obtained in this study are based on the tangent-stiffness properties of a bridge at its dead load state. Both static and dynamic properties of the bridge are considered. A 2-dimensional analytical model is used to study the longitudinal and vertical vibrations of the bridge; a 3-dimensional analytical model is used for the transverse and torsional vibrations. Studies are made of the response of the Golden Gate Bridge to uniform ground motion and to ground motions propagating along the longitudinal axis of the bridge. To determine the severities of the maximum forces and moments caused by various excitations, the maximum values of stresses are calculated for selected elements of the bridge. The studies reported herein show (1) that the effects of a moderate earthquake on the Golden Gate Bridge are essentially negligible; and (2) that a strong earthquake of Richter magnitude 8.+ can produce large values of stresses in certain elements of the bridge. Studies of other suspension bridges located in areas of high seismicity need to take into account the influences of earthquake excitations in the transverse directions as well as in the longitudinal directions of the structures. Multiple-support excitations tend to increase the participation of the higher modes in the total response, leading to larger values of maximum response than those obtained for uniform-support excitations.
Keywords	Suspension bridges Earthquakes Earth movements Seismic waves Vibration Excitation Spectrum analysis Stiffness methods California Earthquake engineering Ground motion Golden Gate Bridge San Francisco(California)
Source Agency	University of California Earthquake Engineering Research Central Berkeley
NTIS Subject Category	50B - Civil Engineering
Corporate Authors	California Univ., Berkeley. Earthquake Engineering Research Center.
Supplemental Notes	See also report dated Nov 76, PB-264 410.
Document Type	Technical Report
NTIS Issue Number	197725

The Effects of Seismic Disturbances on the Golden Gate Bridge.

The Effects of Seismic Disturbances on the Golden Gate Bridge.
PB272279

Publication Date	1976
Personal Author	Baron, F.; Arikan, M.; Hamati, R. E.
Page Count	182
Abstract	This report deals with the effects of seismic disturbances on the Golden Gate Bridge. It is a supplement to the studies made during the design phase of the bridge. The results that are obtained in this study are based on the tangent-stiffness properties of a bridge at its dead load state. Both static and dynamic properties of the bridge are considered. A 2-dimensional analytical model is used to study the longitudinal and vertical vibrations of the bridge; a 3-dimensional analytical model is used for the transverse and torsional vibrations. Studies are made of the response of the Golden Gate Bridge to uniform ground motion and to ground motions propagating along the longitudinal axis of the bridge. To determine the severities of the maximum forces and moments caused by various excitations, the maximum values of stresses are calculated for selected elements of the bridge. The studies reported herein show (1) that the effects of a moderate earthquake on the Golden Gate Bridge are essentially negligible; and (2) that a strong earthquake of Richter magnitude 8.+ can produce large values of stresses in certain elements of the bridge. Studies of other suspension bridges located in areas of high seismicity need to take into account the influences of earthquake excitations in the transverse directions as well as in the longitudinal directions of the structures. Multiple-support excitations tend to increase the participation of the higher modes in the total response, leading to larger values of maximum response than those obtained for uniform-support excitations.
Keywords	Suspension bridges Earthquakes Earth movements Seismic waves Vibration Excitation Spectrum analysis Stiffness methods California Earthquake engineering Ground motion Golden Gate Bridge San Francisco(California)
Source Agency	University of California Earthquake Engineering Research Central Berkeley
NTIS Subject Category	50B - Civil Engineering
Corporate Authors	California Univ., Berkeley. Earthquake Engineering Research Center.
Supplemental Notes	See also report dated Nov 76, PB-264 410.
Document Type	Technical Report
NTIS Issue Number	197725