Compressive forces influence on the vibrations of double beams

Abstract The influence of compressive forces on the lower and upper natural frequencies double beams has been studied in this article. Euler–Bernoulli’s hypotheses have used to derive frequency equations. Two asymmetric were assumed work, four different boundary conditions applied these equations: Pinned–Pinned, Clamped–Clamped, Clamped–Free, Clamped–Pinned. When axial force is increased about 18 times, it observed that decreased by 19% for PP beam, 8% CC 81% CF 12% CP beam. However, greatest effect higher reducing beam a ratio does not exceed 2%. A rise values causes reduction frequencies, mostly while little frequencies. Similarly, when fluctuate simultaneously, their doubled one two changes only.