Nonlinear elastic analysis of steel planar frames under fire loads

作者：Luongo Angelo^*; Contento Alessandro

来源：Computers & Structures, 2015, 150: 23-33.

DOI：10.1016/j.compstruc.2014.12.009

• Fire loading
• Steel structures
• Elastic analysis
• Geometric nonlinearities
• Exact finite element

The nonlinear elastic problem for planar frames, made of rectilinear beams subjected to thermal loadings, is resolved here. The basic element is an Euler-Bernoulli beam, whose elongation is a nonlinear function of the displacements. The elastic law accounts for thermal deformations and for temperature-dependence of the elastic modulus. The elastic problem is formulated in a mixed equilibrium-compatibility form and an 'exact' finite element is derived. Assembling the element relations, the governing equations for the frame are recast in a discrete form. The nonlinear algebraic problem is solved numerically and results are compared with those provided by a FE software.

• 出版日期2015-4-1