Vibration characters and parameter analysis of curved steel-concrete composite beams

In order to study the free vibration characters of the curved steel-concrete composite beams, the free vibration model experiments were conducted on six curved steel-concrete composite box beams with the curve radius and diaphragms quantity as parameters. The spectrum of vibration waveform was analyzed by DASP VIO software for each beam, and the former three orders of the vibration frequencies and vibration modes were obtained. At the same time, the finite element model was employed for each beam by using ANSYS software, and the numerical results were satisfied well with the test data. Both the experimental and numerical results indicate that, with the decrease of the curve radius, the first and the second order of the vertical bending frequency all descent, but the second order of torsional frequency has little change; with the increase of the shear connection degree, the frequency of each order all express a raising trend; the diaphragms quantity has little influence on the free vibration frequency of the curved composite beams.