Open AccessStiffness Identification Method of Simply Elastic Supported Beam based on First-order Modal Rayleigh Solution
Author(s) -
Shujuan Wang,
Xuxi Qin,
Limei Yu,
Bing Tian
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1670/1/012037
Subject(s) - stiffness , structural engineering , beam (structure) , vibration , normal mode , displacement (psychology) , modal analysis , finite element method , superposition principle , girder , modal , materials science , engineering , physics , mathematics , acoustics , mathematical analysis , composite material , psychology , psychotherapist
In order to evaluate the support state of bridges with elastic supports, based on first-order mode Rayleigh solution, a stiffness identification method of elastic supports beam is proposed. The superposition displacement of static displacement and rigid body displacement under sinusoidal load is used as the vibration mode function. Based on the mode function, the calculation formula of the fundamental frequency for the simply supported elastic support beam is derived according to the Rayleigh method. The identification method of the support stiffness and beam stiffness of the elastic support beam is derived by using the measured frequency and the mode value. A precast box girder is analyzed by an example. According to the measured results and finite element results, the stiffness of the precast box girder and the stiffness of the laminated rubber bearing are identified by the stiffness identification method established.