Modal test and vibration comfort analysis of high-rise glulam building floor structure
[Objective]To better meet the objective requirements of the living comfort of the residents of the high-rise glulam building floor structure,it is hoped to put forward reasonable use and vibration reduction measures and methods.[Method]In this paper,the transient excitation,environmental excitation and frequency spectrum identification methods were used to carry out experimental modal test in-site on the three different sizes rooms numbered A,B and C of the same 6-storey glulam structural building,and the finite element analysis was carried out on the vibration characteristics of the floor of room C tested by spectrum recognition method.The dynamic characteristics and overall vibration comfort of the glulam building floor are evaluated.[Result]The research results showed that the first-order bending frequency of the floor structure of room A was 27.50 Hz,the transverse second-order bending frequency was 34.75 Hz,the longitudinal second-order bending frequency was 53.25 Hz,and the first-order torsional frequency was 56.25 Hz.The stiffened wood beams at the bottom of the floor of room A increased the transverse stiffness of the floor structure,but did not offset the anisotropy caused by the longitudinally installed glulam floors,and the overall longitudinal stiffness of the floor was larger than the transverse stiffness.The fundamental frequency values of the floor structures of the three rooms numbered A,B,and C were 27.5,13 and 18 Hz,respectively.They all met the requirements of the relationship between natural frequency and span.The frequency spectrum identification method was in good agreement with the first-order natural frequency of room C obtained by finite element modal analysis.[Conclusion]The wooden beams of glued-wood building floor structure play a role in strengthening its overall rigidity and improving the living comfort.Because of the anisotropy of wooden floor,it is particularly important to set up reinforced wooden beams in its width direction.It can be determined that the glulam building floor overall meets the comfort level requirements specified by the natural frequency of the building.The experimental modal method and frequency spectrum identification method under transient excitation and environmental excitation can be effectively applied to the comfort test of wooden building floors,which has realistic reliability.
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