Nonlinear FEA of higher order beam resting on a tensionless foundation with friction

作者：He, Guanghui; Li, Xiaowei; Lou, Rong^*

来源：Geomechanics and Engineering, 2016, 11(1): 95-116.

DOI：10.12989/gae.2016.11.1.095

• nonlinear quasi-static analysis
• Pasternak foundation
• Masing's friction law
• higher order beam model
• finite element method

A novel higher order shear-deformable beam model, which provides linear variation of transversal normal strain and quadratic variation of shearing strain, is proposed to describe the beam resting on foundation. Then, the traditional two-parameter Pasternak foundation model is modified to capture the effects of the axial deformation of beam. The Masing's friction law is incorporated to deal with nonlinear interaction between the foundation and the beam bottom, and the nonlinear properties of the beam material are also considered. To solve the mathematical problem, a displacement-based finite element is formulated, and the reliability of the proposed model is verified. Finally, numerical examples are presented to study the effects of the interfacial friction between the beam and foundation, and the mechanical behavior due to the tensionless characteristics of the foundation is also examined. Numerical results indicate that the effects of tensionless characteristics of foundation and the interfacial friction have significant influences on the mechanical behavior of the beam-foundation system.