Abstract
To overcome the limitation of terrain and ground objects, curved girder bridges normally adopt a single column pier, on which a single bearing or double bearings with small spacing are seated, making it weak in anti-overturning ability under eccentric load. Presently, the vehicle centrifugal force and seismic action are rarely considered when calculating the anti-overturning stability and tend to aggravate the deflection of curved girder bridges. In this paper, a calculation method is proposed to determine the anti-overturning stability coefficient under earthquake; the calculating equation of anti-overturning stability coefficient under static action is modified. The results show that the influence of centrifugal force cannot be neglected. Otherwise, the calculation of overturning stability is unsafe. The anti-overturning stability of curved girder bridges under earthquake is lower than that under static action. Further, the effect of different structural parameters on the anti-overturning stability coefficient under static and seismic action is similar: the anti-overturning stability coefficient decreases with the growth of bridge deck width, while first decreases sharply and then increases slowly with the growth of curvature radius.
Highlights
IntroductionBridge overturning and instability under vehicle load have been reported occasionally
Over the recent decade, bridge overturning and instability under vehicle load have been reported occasionally
The results show that it is not safe to calculate the anti-overturning stability coefficient when ignoring the influence of the centrifugal force in the current standard, and the relationship between the anti-overturning stability coefficient and the driving speed can be approximately linear
Summary
Bridge overturning and instability under vehicle load have been reported occasionally. The formula for calculating the anti-overturning safety coefficient of curved girder bridges under static load considering the influence of vehicle centrifugal force is given as below:. In the design specifications for bridge structures, only the anti-overturning calculation under static force is required, whereas the anti-overturning stability considering the seismic action has not been required. Since the seismic inertial force of curved beam will generate the torque to the outside of the curve, and the horizontal displacement of the outside of the curved beam will have an negative impact on the overturning moment and stability moment, reducing the anti-overturning stability coefficient of curved girder bridge, it is necessary to analyze the anti-overturning stability of curved girder bridge considering the seismic action. Since the most unfavorable vehicle off-load accident synchronizing with seismic action is a minimal probability event, ψ can be valued according to the observation data and engineering experience of the actual use of bridges, and the value of urban rail traffic bridges is larger than that of other bridges
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