Seismic Evaluation of the Ohio River Bridge on US51 at Wickliffe, Kentucky

摘要

This report presents the use of seismic evaluation of the Ohio river bridge on211u001eUS51 at Wickliffe, Kentucky. The main bridge is a five-span single-deck 211u001ecantilever through-truss type. The approach bridge has 21 spans on the Kentucky 211u001eside and 6 span single-deck cantilever through-truss type. The approach bridge 211u001ehas 21 spans on the Kentucky side and 6 spans on the Illinois side. Although this 211u001ebridge has not yet been subjected to a moderate or major earthquake, it is 211u001esituated within the influence of the New Madrid seismic zone. The seismic 211u001eevaluation program consists of field testing and seismic response analysis. The 211u001emodal properties of the main bridge are determined through field testing, and are 211u001eused to calibrate the three dimensional finite element model. The finite element 211u001emodel is then subjected to time histories of the 50-year earthquake event. 211u001eStresses and displacements obtained are within the acceptable limits. Analytical 211u001eresults indicate that the main bridge will survive the projected 50-year 211u001eearthquake without significant damage and no loss-of-span. Hence, it is not 211u001erecommended to retrofit the main bridge. The approach spans are analyzed using 211u001eresponse spectrum method with simplified single-degree-of-freedom models. Most of 211u001ethe Kentucky and Illinois approach spans require additional anchor bolts at the 211u001ebearings.