This paper presents a novel hybrid FEM-based approach for nonlinear buckling analysis of truss with initial length imperfection. The contribution deals establishing two types finite element (perfection and imperfection element) considering large displacement based on formulation mixed formulation. Therefore, the global equation system is developed by assembling perfection elements. incremental-...

The use of composite laminates for advanced structural applications has increased recently, due in part to their ability tailoring material properties meet specific requirements. In this regard, variable stiffness (VS) designs have potential improved performance over constant designs, made possible by fibre placement technologies which permit steering the path achieve in-plane orientation. Howe...

We develop new quadrature rules for Isogeometric Analysis based on the solution of a local nonlinear problem. A simple and robust algorithm is developed to determine the rules which are exact for important B-Spline spaces of uniform and geometrically stretched knot spacings. We consider both periodic and open knot vector configurations and illustrate the efficiency of the rules on selected boun...

One of the major challenges encountered by civil structures throughout their life cycle pertains to exposure dynamic loadings, with earthquakes representing an extreme case such a load. The frequency content excitation is primary importance not only because potential resonance it induces but also due limitations that arise for capabilities vibration mitigation devices. A recently emerging techn...

We study incremental problems in geometrically nonlinear elastoplasticity. Using the multiplicative decomposition Dφ = FelFpl we consider general energy functionals of the form

This work presents a hybrid shear-flexible beam-element, capable of capturing arbitrarily large inelastic displacements and rotations planar frame structures with just one element per member. Following Reissner's geometrically exact theory, the finite problem is herein formulated within nonlinear programming principles, where total potential energy treated as objective function strain-displacem...