Successive earthquakes of Kocaeli and Duzce within three months indicated that even the survived lifeline structures such as\nbridges under the former event may have damage or collapse potential under the latter event due to their possible stiffness\ndegradation. It is thus important that a rigorous seismic analysis of such structures should account for the effect of prior\nearthquake damage. For this purpose, nonlinear seismic analysis of a reinforced concrete bridge structure has been carried out\nunder both single and multiple earthquake ground motions. Behavior and response evaluation of the bridge piers subjected to\nsuch motions have been discussed in terms of using both flexure-axial and flexure-shear-axial interaction models. Analytical\nresults show that the stiffness degradation under multiple earthquake ground motions is more pronounced than that under single\nearthquake ground motion. In addition, comparison of the response without and with shear demonstrates that shear deformation\nis of significance. The response with shear exhibits the increase in displacement demand and decrease in lateral force carrying\ncapacity, leading to a decrease in energy dissipation capacity. It is concluded that seismic analysis of reinforced concrete bridge\nstructure should account for the effect of multiple earthquake ground motions to assess the demand on such structure properly.
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