Abstract
This present paper summarizes the main results of incoherence of Spatial Variability of Ground Motion (SVGM) component on the non-linear dynamic behavior of a Mila cable stayed bridge. The Hindy and Novack coherence model is developed for the present study in order to examine the SVGM on bridge responses, Nonlinear bridge responses are investigated in terms of transverse displacements and bending moments along the superstructure and substructure of the study bridge, as well as temporal variations of rotational ductility demands at the bridge piers ends under the incoherence SVGM component. The results are systematically compared with those obtained assuming uniform ground motion. As a general trend, it may be concluded that incoherence component of SVGM should be considered for the earthquake response assessments of cable-stayed bridges.
Highlights
Cable stayed bridges represent long structures of economic and strategic importance
This variation noted by Spatial Variability of Ground Motions (SVGM), may induce important quasi-static forces in the extended structures when compared to the case of uniform ground motions
Nonlinear bridge responses are investigated in terms of transverse displacements and bending moments along the superstructure and substructure of the study bridge, as well as temporal variations of rotational ductility demands at the bridge piers ends under the incoherence SVGM component
Summary
Cable stayed bridges represent long structures of economic and strategic importance. Analysis of the seismic responses of cable stayed bridges cannot be based on the assumption that all base supports of these structures are subjected to uniform earthquake excitation. The ground motions at different points of an area affected by the earthquake are variable in term of intensity and content of frequencies This variation noted by Spatial Variability of Ground Motions (SVGM), may induce important quasi-static forces in the extended structures when compared to the case of uniform ground motions. The SVGM is characterized by the coherency function which is mainly represented by four components i) incoherence, ii) wave-passage, iii) site-response and iv attenuation effect The latter is neglected for long extended structures (e.g. bridges, pipelines). In reference [7], It was concluded that the effect of spatially varying site conditions on seismic response of cable stayed bridge structures is in general more pronounced than that of uniform earthquake motions. Based on the numerical results obtained in the present study, conclusions of engineering significance are given
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