Analysis of Multi-span Bridges Using OpenSees

2016PDFTech ReportCA15-258265A0530Bridge piersEarthquake resistant designFinite element methodHighway bridgesSimulationStatic structural analysisStructural modelsTime series analysisFinite ElementTime History Analysis:Equivalent Static AnalysisSeismic ResponseHighway BridgeOpenSeesCaliforniaCalifornia. Dept. of Transportation. Division of Engineering ServicesAlmutairi, AbdullahLu, JinchiWang, NingElgamal, AhmedUniversity of California, San Diego. Dept. of Structural EngineeringCalifornia. Dept. of Transportation. Division of Engineering ServicesUnited States. Federal Highway AdministrationUS Transportation CollectionSeismic response parametric studies of multi-span bridges were performed using OpenSees. The models investigated were derived from three bridge configurations (the Salinas River Bridge, the Samoa Channel Bridge, and the Eureka Channel Bridge). Nonlinear Time History Analysis (THA) was conducted for 14 input motions provided by Caltrans. The THA procedures and results are presented in this report. Results of the Equivalent Static Analysis (ESA) procedure are presented as well. To facilitate the conducted analyses, the user interface MSBridge, in which FE computations are performed using OpenSees, was further developed and employed. In the Salinas River Bridge model, the columns were modeled using the force-based beam-column element (based on the plastic hinge integration method BeamWithHinges) with an idealized bi-linear moment-curvature relationship. The column foundation response was represented by p-y and t-z springs. For the Samoa Channel Bridge and the Eureka Channel Bridge models, the pier columns were modeled using the nonlinear fiber section and the force-based beam-column element with the distributed plasticity integration method (forceBeamColumn). The pier foundation response was modeled by Foundation Matrix. In all cases, an elastic abutment model was employed for simplicity