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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Structural Engineering and Mechanics
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Volume 3, Issue 6 - Nov 1995
Volume 3, Issue 5 - Sep 1995
Volume 3, Issue 4 - Jul 1995
Volume 3, Issue 3 - May 1995
Volume 3, Issue 2 - Mar 1995
Volume 3, Issue 1 - Jan 1995
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Finite element fracture reliability of stochastic structures
Lee, J.C. ; Ang, A.H.S. ;
Structural Engineering and Mechanics, volume 3, issue 1, 1995, Pages 1~10
DOI : 10.12989/sem.1995.3.1.001
This study presents a methodology for the system reliability analysis of cracked structures with random material properties, which are modeled as random fields, and crack geometry under random static loads. The finite element method provides the computational framework to obtain the stress intensity solutions, and the first-order reliability method provides the basis for modeling and analysis of uncertainties. The ultimate structural system reliability is effectively evaluated by the stable configuration approach. Numerical examples are given for the case of random fracture toughness and load.
Three-dimensional analysis of stress and strain transmission through line joints of spatial linkage of plates
Rosenhouse, G. ; Rutenberg, A. ; Goldfarb, Y.R. ;
Structural Engineering and Mechanics, volume 3, issue 1, 1995, Pages 11~23
DOI : 10.12989/sem.1995.3.1.011
The examined model consists of two substructures linked by a right angle rigid line joint. One element is a wall loaded externally along its upper edge by an uneven vertical load. The other element, defined as a plate, is not loaded. Stresses and displacements in the vicinity of the joint are analysed, considering the lateral distribution which leads to three-dimensional effects. The proposed solution combines classical approach with numerical means, using appropriate stress distribution polynomial functions along the joint. Space structure constructions supply cases of interest.
Free vibration analysis of cantilever cylindrical tanks
Hadid, H.A. ; Hasson, D.A. ;
Structural Engineering and Mechanics, volume 3, issue 1, 1995, Pages 25~34
DOI : 10.12989/sem.1995.3.1.025
General free vibration characteristics of cantilevered circular cylindrical tanks are analyzed using the integral equations technique with the cubic spline functions. For computations, the partial differential equations for thin shallow shells as given by Flugge`s have been employed after the addition of the inertia forces. The application of the method is illustrated with a numerical examples of tanks which are free at the top edge and fixed at the bottom. The results obtained by this method have been compared with the available results and a good agreement was found.
Vibration frequencies for elliptical and semi-elliptical Mindlin plates
Wang, C.M. ; Xiang, Y. ; Kitipornchai, S. ;
Structural Engineering and Mechanics, volume 3, issue 1, 1995, Pages 35~48
DOI : 10.12989/sem.1995.3.1.035
This paper presents new frequency results for elliptical and semi-elliptical Mindlin plates of various aspect ratios, thicknesses and boundary conditions. The results were obtained using the recently developed computerized Rayleigh-Ritz method for thick plate analysis. For simply supported elliptical plates, it is proposed that the penalty function method be used to enforce the condition of zero rotation of the midplane normal in the tangent plane to the plate boundary.
Vibration and stability analyses of thick anisotropic composite plates by finite strip method
Akhras, G. ; Cheung, M.S. ; Li, W. ;
Structural Engineering and Mechanics, volume 3, issue 1, 1995, Pages 49~60
DOI : 10.12989/sem.1995.3.1.049
In the present study, a finite strip method for the vibration and stability analyses of anisotropic laminated composite plates is developed according to the higher-order shear deformation theory. This theory accounts for the parabolic distribution of the transverse shear strains through the thickness of the plate and for zero transverse shear stresses on the plate surfaces. In comparison with the finite strip method based on the first-order shear deformation theory, the present method gives improved results for very thick plates while using approximately the same number of degrees of freedom. It also eliminates the need for shear correction factors in calculating the transverse shear stiffness. A number of numerical examples are presented to show the effect of aspect ratio, length-to-thickness ratio, number of plies, fibre orientation and stacking sequence on the natural frequencies and critical buckling loads of simply supported rectangular cross-ply and arbitrary angle-ply composite laminates.
Simplified dynamic analysis of slender tapered thin-walled towers with additional mass and rigidity
Takabatake, Hideo ; Mizuki, Akira ;
Structural Engineering and Mechanics, volume 3, issue 1, 1995, Pages 61~74
DOI : 10.12989/sem.1995.3.1.061
A linearly tapered, doubly symmetric thin-walled closed member, such as power-transmission towers and tourist towers, are often characterized by local variation in mass and/or rigidity, due to additional mass and rigidity. On the preliminary stage of design the closed-form solution is more effective than the finite element method. In order to propose approximate solutions, the discontinuous and local variation in mass and/or rigidity is treated continuously by means of a usable function proposed by Takabatake(1988, 1991, 1993). Thus, a simplified analytical method and approximate solutions for the free and forced transverse vibrations in linear elasticity are demonstrated in general by means of the Galerkin method. The solutions proposed here are examined from the results obtained using the Galerkin method and Wilson-
method and from the results obtained using NASTRAN.
Transition membrane elements with drilling freedom for local mesh refinements
Choi, Chang-Koon ; Lee, Wan-Hoon ;
Structural Engineering and Mechanics, volume 3, issue 1, 1995, Pages 75~89
DOI : 10.12989/sem.1995.3.1.075
A transition membrane element designated as CLM which has variable mid-side nodes with drilling freedoms has been presented in this paper. The functional for the linear problem, in which the drilling rotations are introduced as independent variables, has been formulated. The transition elements with variable side nodes can be efficiently used in the local mesh refinement for the in-plane structures, which have stress concentrations. A modified Gaussian quadrature is needed to be adopted to evaluate the stiffness matrices of these transition elements mainly due to the slope discontinuity of displacement within the elements. Detailed numerical studies show the excellent performance of the new transition elements developed in this study.
Shear center for elastic thin-walled composite beams
Pollock, Gerry D. ; Zak, Adam R. ; Hilton, Harry H. ; Ahmad, M. Fouad ;
Structural Engineering and Mechanics, volume 3, issue 1, 1995, Pages 91~103
DOI : 10.12989/sem.1995.3.1.091
An analysis to determine shear centers for anisotropic elastic thin-walled composite beams, cantilevered and loaded transversely at the free end is presented. The shear center is formulated based on familiar strength of material procedures analogous to those for isotropic beams. These procedures call for a balancing of torsional moments on the cross sectional surface and lead to a condition of zero resultant torsional couple. As a consequence, due the presence of anisotropic coupling, certain non-classical effects are manifested and are illustrated in two example problems. The most distinguishing result is that twisting may occur for composite beams even if shear forces are applied at the shear center. The derived shear center locations do not depend on any specific anisotropic bending theories per se, but only on the values of bending and shear stresses which such theories produce.