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A seismic evaluation procedure for a cable-stayed bridge based on the energy balance concept is presented. In this method, the capacity curve obtained from the modal pushover analysis of the cable-stayed bridge is converted to a modal energy capacity diagram. Then, by intersecting this diagram and the energy demand diagram for a selected ground motion, the dynamic target point is obtained. The method was employed on a cable-stayed bridge under Imperial Valley earthquakes with different peak ground motions and the seismic demands were compared with the results from modal pushover and non-linear response history analyses. It was found that this energy balance method can estimate the seismic responses under the selected ground motions with good accuracy. OpenSees software was employed for modelling and analysis of the cable-stayed bridge.

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