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| INFLUENCES OF THE INTERFACIAL UPLIFT AND AXIAL LOAD ON DYNAMIC BENDING CHARACTERISTICS OF COMPOSITE BEAMS |
| YANG Xiao, LI Xiaowei, WANG Dejiang |
| Department of Civil Engineering, Shanghai University, Shanghai 200072 |
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Abstract Taking into account the normal/tangential interfacial partial interaction and the second-order effect of axial load of each sub-beam, displacement-based nonlinear and first order approximate initial-boundary value problems for the dynamic bending of the Euler-Bernoulli composite beam, by virtue of the Hamilton’s principle, are formulated, and then the buckling load and natural frequencies of the composite beam with partial interaction are investigated by the differential quadrature method (DQM). On the basis of the correctness and validaty of the proposed DQM verified via the comparisons with the analytical solutions available and FEM ones, the parameter study is conducted, and the influences of the interfacial stiffness on dynamic characteristics and stability and the effects of the axial force on the natural frequencies are studied. The numerical results show that the natural frequencies and buckling load of the composite beam increase with the increase of its interfacial stiffness, and eventually approaching to the ones of full composite beam, and the first natural frequency decreases to zero with the increase of the axial load approaching to the buckling load. And furthermore, the critical load increases with the the interfacial normal and tangential stiffness increase.
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Received: 12 January 2015
Published: 15 April 2016
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