Performance analysis of bimodular simply supported beams based on the deformation decomposition method

Abstract

A deformation decomposition method is proposed to study the basic deformation performance of bimodular simply supported beams, which is validated by the finite element method, the analytical solution of neutral axis height and the opening beam test. The proposed method can not only quantitatively identify tensile, compressive, bending and shear deformation of bimodular structures, but also visualize regions dominated by the above basic deformations. When the tensile-compression elastic modulus differs greatly, a composite beam phenomenon exists in bimodular simply supported shallow beams. Reducing the tensile-compression elastic modulus ratio of the material can make deep beams produce similar characteristics to shallow beams.

Highlights

• A deformation decomposition method suitable for bimodular structures is proposed and validated by the finite element method, the analytical solution of neutral axis height and the opening beam test.

• The proposed method can not only quantitatively identify the tensile, compressive, bending and shear deformation, but also visualize the area dominated by the above basic deformation.

• When the elastic modulus of tension and compression differs greatly, a composite beam phenomenon exists in bimodular simply supported shallow beams.

• Properly reducing tensile-compression elastic modulus ratio of the material can make deep beams possess similar characteristics with shallow beams.

Keywords:

• Bimodular
• tension and compression
• simply supported beam
• deformation decomposition
• composite beam phenomenon
• deep beam

Additional information

Funding

This work was supported by the National Natural Science Foundation of China under Grant No. 51878621.