Vibration analysis of thin-walled composite beams with I-shaped cross-sections

摘要

A general analytical model applicable to the vibration analysis of thin-walled composite I-beams with arbitrary lay-ups is developed. Based on the classical lamination theory, this model has been applied to the investigation of load-frequency interaction curves of thin-walled composite beams under various loads. The governing differential equations are derived from the Hamilton's principle. A finite element model with seven degrees of freedoms per node is developed to solve the problem. Numerical results are obtained for thin-walled composite I-beams under uniformly distributed load, combined axial force and bending loads. The effects of fiber orientation, location of applied load, and types of loads on the natural frequencies and load-frequency interaction curves as well as vibration mode shapes are parametri-cally studied.