Free vibrations of the partial-interaction composite members with axial force

2007 ◽  
Vol 299 (4-5) ◽  
pp. 1074-1093 ◽  
Author(s):  
Yu-Fei Wu ◽  
Rongqiao Xu ◽  
Weiqiu Chen
Keyword(s):  
Axial Force ◽  
Free Vibrations ◽  
Partial Interaction

scholarly journals Some aspects of analysis of transverse free vibrations of uniform beams loaded with axial force

2018 ◽  
Vol 61 (2) ◽  
pp. 35-55
Author(s):  
Dijana Majstorović ◽  
Aleksandar Borković ◽  
Aleksandar Prokić ◽  
Radovan Vukomanović
Keyword(s):  
Axial Force ◽  
Free Vibrations

scholarly journals PLUCK TESTS ON OPERATING DEEPWATER PIPELINE SPANS

2020 ◽  
Author(s):  
Ralf Peek ◽  
Chiara A. Bernardo ◽  
Hui Min Hong ◽  
Conleth D. O’Loughlin ◽  
David White ◽  
...  
Keyword(s):  
Natural Frequency ◽  
Axial Force ◽  
Weak Link ◽  
Free Vibrations ◽  
Spring Stiffness ◽  
Subsea Pipeline ◽  
Vortex Induced Vibrations ◽  
Soil Damping ◽  
To Come

Key uncertainties in the assessment of subsea pipeline spans for fatigue due to vortex-induced vibrations (VIV) are the effective axial force, the soil spring stiffness, and the soil damping. To reduce these uncertainties, pluck tests have been carried out, to determine the natural frequency and damping of single and multiple spans. These are carried out by pulling the span laterally at midspan with the ROV, until a 6mm or 8mm PP rope that serves as a weak link in the connection from the pipeline and the ROV breaks. The free vibrations resulting from this pluck are measured with accelerometers attached to the pipeline. The paper presents selected results from these tests and their interpretation in terms modal frequencies and damping ratios. Already at the achieved amplitudes of vibration of up to about 0.01D, the results already show considerable nonlinearity and inelasticity that is thought to come from the soil supporting the pipe at the shoulders of the span, and can be captured in FE models by making the soil springs nonlinear and inelastic.

scholarly journals Elastic Analysis of Steel-Concrete Composite Beams with Partial Interaction

2021 ◽  
Vol 1203 (3) ◽  
pp. 032110
Author(s):  
Stefan M. Buru ◽  
Cosmin G. Chiorean ◽  
Mircea Botez
Keyword(s):  
Axial Force ◽  
Stiffness Matrix ◽  
Concrete Slab ◽  
Homogeneous Equation ◽  
Neumann Boundary ◽  
Composite Beams ◽  
Elastic Analysis ◽  
Partial Interaction ◽  
Full Interaction ◽  
Midspan Deflection

Abstract The paper presents an exact analytical method for the elastic analysis of steel-concrete composite beams with partial interaction. Accepting the basic assumptions of the Newmark analytical model and adopting the axial force in the concrete slab as the main unknown, the second order nonhomogeneous differential equation of the steel-concrete composite element with partial interaction is derived. Further, the complete solutions for simply supported and fixed-ended composite beams subjected to concentrated and uniform loads respectively, are developed. The solution of the homogeneous equation is determined by imposing proper Dirichlet or Neumann boundary conditions depending on the static scheme of the element. The particular solutions are then derived for the considered loading conditions. It is shown that the internal axial force in concrete slab associated to composite beams with partial interaction can be expressed as a fraction of the axial force in concrete slab under full interaction through a non-dimensional function f(aL) which takes into account the connection’s stiffness, the mechanical properties and also the length of the element. Moreover, the solutions are included in a flexibility-based approach to derive the force-displacement relations of the beam element with partial interaction. For the resulted 2-noded beam-column element with 6DOF, the stiffness matrix is derived, showing that the partial composite action may be included at the element level by means of a series of correction factors applied to the standard full-interaction stiffness matrix coefficients. A numerical example is provided to demonstrate the accuracy and performance of the proposed method. Within the elastic range, the predicted load-midspan deflection curve is in very good agreement with both experimental and other numerical results retrieved from international literature. A parametric study was conducted to investigate the influence of the shear connection degree on the beam’s midspan deflection and the results were compared with those computed by using code provisions.

Method of determination of aerodynamic axial force acting on vehicle body and stabilizer on it

2001 ◽  
Vol 7 (1s) ◽  
pp. 89-92
Author(s):  
E.A. Ermolenko ◽  
◽  
Yu.V. Kamenchuk ◽  
Keyword(s):  
Axial Force ◽  
Vehicle Body ◽  
Method Of Determination

Cyclic Flexural Behavior of Steel Pipes Repaired by Patch Plate Subjected to Constant Axial Force

2012 ◽  
Vol 61 (6) ◽  
pp. 543-549 ◽  
Author(s):  
Kazuo FURUNISHI ◽  
Yasuo KITANE ◽  
Yoshito ITOH
Keyword(s):  
Axial Force ◽  
Flexural Behavior ◽  
Steel Pipes

Numerical analysis of free vibrations of rectangular plates based on different approaches

2019 ◽  
pp. 33-41
Author(s):  
Oleksandr Grigorenko ◽  
◽  
Maksym Borysenko ◽  
Olena Boychuk ◽  
Volodymyr Novytskyi ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Free Vibrations ◽  
Rectangular Plates
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