بایگانی برچسب برای: Finite element

Finite.Element.Analysis.Joseph.E.Flaherty.[taliem.ir]

CSCI, MATH 6860 FINITE ELEMENT ANALYSIS

The finite element method is a computational technique for obtaining approximate solu tions to the partial diff erential equations that arise
Inelastic large deflection analysis of structural steel members under cyclic loading[taliem.ir]

Download Inelastic large deflection analysis of structural steel members under cyclic loading

The present paper is concerned with the cyclic inelastic large deflection analysis of structural steel members, such as pin-ended columns and fixed-ended tubular beam-columns of strut type. An elastoplastic finite element formulation for beam-columns, accounting for both the material and geometrical nonlinearities, was developed and implemented in the computer program FEAP used in the analysis. The geometrical nonlinearity is considered using the modified approximate updated Lagrangian description of motion. The two-surface plasticity model, recently developed by the authors, is employed for material nonlinearity. The model accounts for the important cyclic characteristics of structural steel, even within the yield plateau, such as, the decrease and disappearance of the yield plateau, reduction of the elastic range and cyclic strain hardening. The cyclic elastoplastic performance of the formulation was found to be good when compared with the experimental results as well as the results obtained from other material models
Modelling the prestress transfer in pre-tensioned concrete elements[taliem.ir]

Modelling the prestress transfer in pre-tensioned concrete elements

Three models were developed to simulate the transfer of prestress force from steel to concrete in pretensioned concrete elements. The first is an analytical model based on the thick-walled cylinder theory and considers linear material properties for both steel and concrete. The second is an axi-symmetric finite element (FE) model with linear material properties; it is used to verify the analytical model. The third model is a three dimensional nonlinear FE model. This model considers the post-cracking behaviour of concrete as well as concrete shrinkage and the time of prestress releasing. A new expression from the analytical model is developed to estimate the transmission length as well as the stress distribution along the tendon. The paper also presents a parametric study to illustrate the impact of diameter of prestressing steel, concrete cover, concrete strength, initial prestress, section size, surface roughness of prestressing steel, time of prestress release, and the member length on the transfer of stress in pre-tensioned concrete elements