Experimental research on the dynamic responses of the steel-concrete composite beams under the harmonic forces

Abstract

In order to research the dynamic response of the steel-concrete composite beam under forced vibration, three simply-supported steel-concrete composite beams were designed with the shear connection degree as the parameter, the dynamic model experiments under the harmonic load with different static load components, load amplitudes, and load frequencies were conducted on each test beam, the mid-span acceleration and deflection, and the mean slip and slip amplitude at different measuring points were obtained. The results indicate that, the mean slip value and the slip amplitude at the surface between the steel girder and concrete slab, the mid-span accelerate and dynamic deflection are all show a sine wave shape under the sine harmonic load, and increase with the shear connection degree’s decrease. The mid-span dynamic deflection and mean value of the ship are most influenced by the static load components, the slip amplitude is most influenced by the load amplitude, and the mid-span accelerate is mainly affected by the load frequency and amplitude.