UC San Diego

The primary purpose of this project is to explore the nonlinear seismic response of an ordinary two span bridge using advanced nonlinear computational techniques. For that purpose, MSBridge, a new nonlinear finite element graphical user interface which conducts calculations using the platform OpenSees is employed. The Meloland Road Overpass is used as the benchmark structure for a parametric study of alterations in salient modeling details. The investigated bridge systems are subjected to three component earthquake accelerations scaled to fit an appropriate Caltrans site-specific spectrum. The examined model configurations address the influence of the transverse reinforcing ratio, and the general effect of implementation of a steel jacket for the column. The various model response characteristics are compared and discussed. Throughout the conducted MSBridge analyses, every modified model responded in a logical fashion with respect to the specified alteration. Therefore, MSBridge proves to be a useful tool when conducting ordinary bridge model analyses. Overall, the conducted numerical studies provide valuable insights into the mechanisms of resistance supplied by the bridge column and its abutments