An Analytical Method for Crack Detection of Beams with Uncertain Boundary Conditions by a Concentrated Test Mass
作者: Seyed Milad Mohtasebi Naser Khaji
刊名: Civil Engineering Journal, 2018, Vol.4 (7)
来源数据库: C.E.J Publishing Group
关键词: Timoshenko Beam TheoryTest MassDynamic CharacteristicsCracked BeamSpring Boundary Conditions.
原始语种摘要: The aim of this study is to introduce a method for crack detection and simultaneously assessing boundary conditions in beams. This study suggests a method based on the effect of a concentrated test mass on the natural frequency that is defined as a stationary mass, which can be located in different positions of the beam and cannot be separated from the beam. Timoshenko beam theory is used to calculate the frequencies. In this method, a beam with the desired number of cracks is modeled. The beam is divided into separated parts at crack section which are joined together by elastic weightless torsion springs, to avoid non-linearity effects, it is assumed that the crack is always open. At the first step, equations for a cracked beam are extracted by considering the spring boundary conditions....
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  • suggested 建议
  • effects 海员自身物品
  • conditions 条件式
  • torsion 扭转
  • separated 相隔
  • weightless 失重的
  • applied 应用的
  • acceptable 可接受的
  • errors 错帐
  • crack 裂隙