Experimental investigation of the large amplitude vibrations of a thin-walled column under self-weight

Analysis of the structural behavior of a membrane using digital image processing

“…To estimate the stresses, it is necessary to obtain the elastic constants E and C. These constants are determined by fitting the experimental stress-strain curve using the least squares method, which minimizes the possible errors in the determination of the experimental stresses [28,29]. With the estimated stress values, it is possible to obtain the average forces on different sections of the membrane in the x and y directions and to correlate them with the force values measured throughout the test using a load cell.…”

“…Additionally, this system allows adjustments of the camera such as zoom, focus, and image capture mode switching (frame or field), among other functions, to be performed via programming. A detailed description of the vision system can be found in [28,29].…”

“…For this reason, there is a growing interest in the development of alternative experimental displacement measurement techniques without contact with the structure, such as the use of imaging with a computer vision system as a movement sensor, as shown in Refs. [27][28][29][30][31][32][33][34][35]. There are also interferometry techniques, such as speckle interferometry, speckle photography and hologram interferometry [36][37][38][39][40][41][42].…”

Dynamic behaviours of reinforced concrete columns under cyclic loading with variable rates

“…Wang et al (2013) focused on the study of the mechanical properties of the RC columns with different specifications under different loading rates. Goncalves et al (2013) presented an experimental methodology specially developed for the nonlinear large amplitude free vibration analysis of a clamp-free thin-walled metal column under self-weight. Moragaspitiya et al (2014) presented an innovative method to quantify axial deformations of columns in a structural framing system using its vibration characteristics, incorporating the influence of load tributary areas, boundary conditions and load migration among the columns.…”

Nonlinear Resonance Analysis of Slender Portal Frames under Base Excitation

“…Solutions of different beam configurations under static loads and forced dynamic excitations are compared against ones from other geometrically nonlinear beam formulations. Gonçalves et al [18] published an experimental analysis of the nonlinear vibrations of a slender metal column under self-weight. Masoodi and Moghaddam [19] studied the nonlinear dynamics and natural frequencies of gabled frames having flexible restraints and connections.…”