Geometric Stiffness
Mostrando 1-12 de 38 artigos, teses e dissertações.
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1. Finite element computational development for thermo-mechanical analysis of plane steel structures exposed to fire
Abstract This article presents a numerical formulation based on finite element procedures for application in nonlinear thermo-mechanical analyses of steel planar structures under fire condition. The mechanical properties of structural elements degrade when subjected to high temperatures, resulting in significant reductions in strength and stiffness. Under th
REM - International Engineering Journal. Publicado em: 2022
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2. Avaliação de desvio dimensional em Inconel 718 após a retificação em diferentes técnicas de lubri-refrigeração
RESUMO O Inconel 718 é uma liga à base de níquel que possui elevada resistência à fadiga e à fluência, ductilidade, rigidez, inércia química e capacidade de operar em elevadas temperaturas, por isto é bastante utilizada na fabricação de peças aeronáuticas de alto rendimento. Estas peças exigem tolerâncias dimensionais e geométricas estreitas
Matéria (Rio J.). Publicado em: 25/11/2019
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3. Structural models for analysis of reinforced concrete frame buildings with masonry infills
Resumo Este trabalho tem como objetivo o estudo do comportamento de pórticos de edifícios de concreto armado preenchidos com alvenaria frente às ações horizontais, empregando-se dois modelos estruturais: i) modelo de diagonal equivalente (MDE) e ii) modelo com elementos finitos bidimensionais para estado plano de tensões (MEF). No primeiro modelo, a al
Rev. IBRACON Estrut. Mater.. Publicado em: 11/11/2019
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4. Analytical determination of the vibration frequencies and buckling loads of slender reinforced concrete towers
Abstract This study focused on improving the design of slender structures with reinforced concrete (RC) telecommunication towers as the main application. Analytical procedure based on Rayleigh’s method to compute the first natural vibration frequency and the critical buckling load was development. All the nonlinearities present in the system were considere
Lat. Am. j. solids struct.. Publicado em: 27/06/2019
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5. Inelastic second-order analysis of steel columns under minor-axis bending
Abstract The inelastic second-order behavior of steel structural columns under minor-axis bending is presented in this article. To study this behavior, a nonlinear frame element formulation is adopted in which the steel's plasticity process is accompanied at the nodal points of each finite element through the refined plastic-hinge method (RPHM). A tangent mo
REM, Int. Eng. J.. Publicado em: 19/06/2019
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6. A Unified Approach to the Timoshenko Geometric Stiffness Matrix Considering Higher-Order Terms in the Strain Tensor
Abstract Nonlinear analyses using an updated Lagrangian formulation considering the Euler-Bernoulli beam theory have been developed with consistency in the literature, with different geometric matrices depending on the nonlinear displacement parts considered in the strain tensor. When performing this type of analysis using the Timoshenko beam theory, in gene
Lat. Am. j. solids struct.. Publicado em: 25/04/2019
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7. Optimal design of beam-column connections of plane steel frames using the component method
Abstract This paper presents a methodology for optimization of beam-column connections of plane steel frames. The objective is to obtain beam- column connections mechanically more efficient and with minimum cost by determination of the optimal dimensions for the components of the connection; satisfying mechanical constraints associated with the bending momen
Lat. Am. j. solids struct.. Publicado em: 29/10/2018
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8. Adaptation of the Lanczos Algorithm for the Solution of Buckling Eigenvalue Problems
Abstract An adaptation of the conventional Lanczos algorithm is proposed to solve the general symmetric eigenvalue problem Kϕ = λK Gϕ in the case when the geometric stiffness matrix KG is not necessarily positive-definite. The only requirement for the new algorithm to work is that matrix K must be positive-definite. Firstly, the algorithm is presented fo
Lat. Am. j. solids struct.. Publicado em: 23/04/2018
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9. Free Vibration Analysis of Multiple Cracked Functionally Graded Timoshenko Beams
Abstract In this paper, authors present the study of free vibration of bending multiple cracked functionally graded material (FGM) beam. Vibration equations of multiple cracked FGM beam were established by using the rotational spring model of cracks, dynamic stiffness method (DSM) and actual position of neutral plane. The frequency equation obtained was in a
Lat. Am. j. solids struct.. Publicado em: 2017-09
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10. An Explicit Consistent Geometric Stiffness Matrix for the DKT Element
Abstract A large number of references dealing with the geometric stiffness matrix of the DKT finite element exist in the literature, where nearly all of them adopt an inconsistent form. While such a matrix may be part of the element to treat nonlinear problems in general, it is of crucial importance for linearized buckling analysis. The present work seems to
Lat. Am. j. solids struct.. Publicado em: 2017-03
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11. Finite Element Investigation of Performance of Composite-Steel Double Lap Adhesive Joint Under Tensile Loading
Abstract Parametric study of composite-steel double lap joint under tensile loading is performed using finite element modeling. The joint is such that steel is placed between a straight and a curved composite sublaminate. Three joint characteristics including maximum Von Mises stress in adhesive layer, stiffness and weight are investigated. Design curves are
Lat. Am. j. solids struct.. Publicado em: 2017-02
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12. Evaluation of Standard API Casing Connections and Parametric API Buttress Improvement by Finite Element Analysis
Threaded and coupled connections generally present a non-uniform stress distribution, which is related to the higher stiffness of the box when compared to the pin. The non-uniform stress distribution can contribute to fatigue cracks and other failure modes in high pressure oil wells. An API 5CT P110 steel obtained from a seamless pipe was mechanically charac
Mat. Res.. Publicado em: 08/12/2016