Cracked Beam
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Improved finite element of a transversely cracked straight beam with an additional degree of freedom
Abstract A new finite element with an additional degree of freedom at the crack location is derived for static bending analysis of a transversely cracked uniform slender beam. In the simplified computational model, which is based on Euler-Bernoulli's theory of small displacements, the crack is represented by a linear rotational spring connecting two elastic
Lat. Am. j. solids struct.. Publicado em: 27/06/2019
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2. Free and forced vibration analysis of multiple cracked FGM multi span continuous beams using dynamic stiffness method
Abstract In the present paper, the free and forced vibration of multiple cracked multi span continuous beams made of functionally graded material (FGM) is investigated by the dynamic stiffness method. First, there are constructed dynamic stiffness matrix and nodal load vector of multiple cracked FGM beam element using Timoshenko beam theory and massless doub
Lat. Am. j. solids struct.. Publicado em: 14/03/2019
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3. Structural Behavior of RC Beams Containing a Pre- Diagonal Tension Crack
Abstract This study focuses the light on the shear behavior of pre-cracked beams, and examines the feasibility of applying fracture mechanics concepts to widen the understanding of shear behavior and mechanisms. The experimental program contains ten beam specimens of high strength concrete (HSC) and steel fiber reinforced concrete (SFRC). Pre-cracks were emb
Lat. Am. j. solids struct.. Publicado em: 16/07/2018
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4. 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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5. Mode Shape Analysis of Multiple Cracked Functionally Graded Timoshenko Beams
Abstract The present paper addresses free vibration of multiple cracked Timoshenko beams made of Functionally Graded Material (FGM). Cracks are modeled by rotational spring of stiffness calculated from the crack depth and material properties vary according to the power law throughout the beam thickness. Governing equations for free vibration of the beam are
Lat. Am. j. solids struct.. Publicado em: 2017-08
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6. Dynamic Analysis of Elastically Supported Cracked Beam Subjected to a Concentrated Moving Load
Abstract This study deals with the dynamic behavior of a cracked beam subjected to a concentrated force traveling at a constant velocity. Dynamic analyses for a hinged-hinged cracked beam resting on elastic supports under the action of a moving load are carried out by the finite element method. For the beam having rectangular cross-section, element formulati
Lat. Am. j. solids struct.. Publicado em: 2016-01
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7. Modeling of Cracked Beams by the Experimental Design Method
Abstract The understanding of phenomena, no matter their nature is based on the experimental results found. In the most cases, this requires an important number of tests in order to put a reliable and useful observation served into solving the technical problems subsequently. This paper is based on independent and variables combination resulting from experim
Lat. Am. j. solids struct.. Publicado em: 2015-09
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8. Parametric resonance in concrete beam-columns
A dynamic instability, called parametric resonance, is exhibited by undampedelastic beam-columns when under the action of pulsating axial force. The scope of the existing theory of parametric resonance is restricted to physically linear beam-columns undergoing finite lateral displacements. In this Paper, the dynamic behaviour of physically nonlinear elastic
Lat. Am. j. solids struct.. Publicado em: 2014-11
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9. Avaliação da eficiência do uso de conectores de cisalhamento no reforço de vigas de concreto armado pela face comprimida / Evaluation of the efficiency of the use of shear connectors in the strengthening of reinforced concrete beams by the compressed face
A structure is designed to have satisfactory performance during its life given the requirements for which it was designed. When performance becomes unsatisfactory, intervention is needed in order to rehabilitate the structure. Structural rehabilitation is characterized by increasing the structure‟s original load bearing capacity. Of the various existin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/06/2011
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10. Análise por elementos finitos da influência de descontinuidades geométricas sobre o comportamento dinâmico de rotores flexíveis.
This work deals with a finite element analysis of the dynamic behavior of cracked flexible rotors supported by hydrodynamic journal bearing. Geometric discontinuities such as cracks, holes, undercuts, etc. can strongly affect the vibrational response of rotating systems due to the rotor local flexibility changes. The rotor model is based on the Timoshenko be
Publicado em: 2007
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11. Algoritmo híbrido para avaliação da integridade estrutural: uma abordagem heurística / Hybrid algorithm for damage detection: a heuristic approach
In this study, a new auto configured Particle Swarm Optimization - Simplex algorithm for damage detection has been proposed. The formulation of the objective function for the minimization problem is based on the frequency response functions (FRFs) and the modal parameters of the system. A novel strategy for the control of the Particle Swarm Optimization (PSO
Publicado em: 2007
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12. Fracture toughness measurements of LPS-SiC: a comparison of the indentation technique and the SEVNB method
Many methods are currently used to measure the fracture toughness of ceramic materials. Methods based on crack-length measurements of cracks introduced into the sample surface by the Vicker's indentor have the advantage that they are easy to use, but are very unreliable due to subcritical crack growth and the difficulty in determining the exact length of the
Materials Research. Publicado em: 2005-06