Test and research of comfortable degree of structure of high strength bolts connected U-shaped steel plate-concrete composite open-web sandwich floor

Large span slab structure has appropriate stiffness,quality and damping.The vertical frequency and vibration acceleration are indices for vertical vibration comfort control.The Heilongjiang University of Chinese Medicine Amusement and Sports Center area B,which is a two-bay and multi-story structure(one underground level and three levels above the ground) was studied by using environmental excitation and the field modal test was carried out by using frequency domain method modal fitting method.The first four order vertical vibration frequencies,vibration modes and vertical acceleration were obtained.The results were analyzed and evaluated by using the finite element method.The results of the study show that floor vertical first order vibration frequency calculation and test results meet the latest standard requirements well.The floor vertical acceleration test results is less than 0.005g,which will not cause discomfort.The frequency by the finite element method is higher than test results because of different constraint conditions.The rigid connection of floor and columns needs to be considered in the design.