Benchmark Structural Control Problem for a Seismically Excited Highway Bridge, Part I: Problem Definition

This paper presents the problem definition of the benchmark structural control problem for the seismically excited highway bridge. The benchmark problem is based on the newly constructed 91/5 highway over-crossing in Southern California. The goal of this effort is to develop a standardized model of a highway bridge using which competing control strategies, including devices, algorithms and sensors, can be evaluated comparatively. To achieve this goal, a 3-D finite-element model is developed in MATLAB to represent the complex behavior of the full-scale highway crossing. The nonlinear behavior of center columns and isolation bearings are considered in formulating the bilinear force-deformation relationship. The effect of soil-structure interaction is considered by modeling the interaction by equivalent spring and dashpot. The ground motions are considered to be applied simultaneously in two directions. A MATLAB based nonlinear structural analysis tool has been developed and made available for nonlinear dynamic analysis. Control devices are assumed to be installed between the deck and the end-abutments of the bridge. Evaluation criteria and control constraints are specified for the design of controllers. Passive, semi-active and active devices and algorithms can be used to study the benchmark model. Participants in this benchmark study are required to define their control devices, sensors, and control algorithms, evaluate and report the results of their proposed control strategies. 1 Asso. Prof. and Post-Doctoral Researcher, respectively, The City College of the City Univ. of New York, New York, NY 10031. 2 Associate Professor, Depts. of Civil & Env.Eng. and Mech.Eng.& Mat.Sc., Rice University, Houston, TX 77005. 3 Asst. Prof., Dept. of Civil and Env. Engrg., Univ. of Illinois, Urbana-Champaign Urbana, IL 61801.