Hybrid control of steel-concrete composite girder bridges considering the slip and shear-lag effects with MR–TMD based on train-bridge interactions

Abstract

With the speed of trains higher and bridge structures towards larger spans with lighter weight, the train-bridge resonance will become fairly pronounced. Therefore, to ensure the safety of bridge structures, research on vibration control is of far-reaching significance, especially for steel–concrete composite girder bridges with mechanical properties, such as slip, and shear lag. Therefore, based on a magnetorheological tuned mass damper (MR–TMD), this paper proposes a hybrid control strategy for the steel–concrete composite girder bridge considering whether the trains are either on or off the bridge, and applies it to a numerical example, reducing vertical dynamic responses of a railway steel–concrete composite girder bridge based on train-bridge interactions. The results illustrate that this control strategy is suitable for the time-varying steel–concrete composite girder bridge-train coupling system, and exhibits reliability, stability and robustness to some extent, which has a bright future in engineering applications.