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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 4, Issue 6 - Nov 1996
Volume 4, Issue 5 - Sep 1996
Volume 4, Issue 4 - Jul 1996
Volume 4, Issue 3 - May 1996
Volume 4, Issue 2 - Mar 1996
Volume 4, Issue 1 - Jan 1996
Selecting the target year
Linear fracture envelopes for fatigue assessment of welds in bridges
Ghosh, A. ; Oehlers, D.J. ; Wahab, M.A. ;
Structural Engineering and Mechanics, volume 4, issue 4, 1996, Pages 347~364
DOI : 10.12989/sem.19220.127.116.117
Presently welded components are designed using S/N curves which predict only the fatigue life of the component. In order to ascertain the condition of the weld at any intermediate period of its life inspection is carried out. If cracks are detected in a weld fracture mechanics is used to find their remaining life. A procedure for assessment is developed here that can be used to verify the condition of a weld before inspection is carried out to detect cracks. This simple method has been developed using linear fracture envelopes by combining S/N curves with linear elastic fracture mechanics.
Braced, partially braced and unbraced columns: Complete set of classical stability equations
Aristizabal-Ochoa, J. Dario ;
Structural Engineering and Mechanics, volume 4, issue 4, 1996, Pages 365~381
DOI : 10.12989/sem.1918.104.22.1685
Stability equations that evaluate the elastic critical axial load of columns in any type of construction with sidesway uninhibited, partially inhibited, and totally inhibited are derived in a classical manner. These equations can be applied to the stability of frames (unbraced, partially braced, and totally braced) with rigid, semirigid, and simple connections. The complete column classification and the corresponding three stability equations overcome the limitations and paradoxes of the well known alignment charts for braced and unbraced columns and frames. Simple criteria are presented that define the concept of partially braced columns and frames, as well as the minimum lateral bracing required by columns and frames to achieve non-sway buckling mode. Various examples are presented in detail that demonstrate the effectiveness and accuracy of the complete set of stability equations.
Buckling behaviour of plates partially restrained against rotation under stress gradient
Bedair, Osama K. ;
Structural Engineering and Mechanics, volume 4, issue 4, 1996, Pages 383~396
DOI : 10.12989/sem.1922.214.171.1243
In this paper, the behavior of plates partially restrained against rotation under stress gradient is investigated. As a first stage, an energy formulation is presented to model this boundary condition and a general expression is derived for the prediction of the elastic buckling of the plate under this general loading condition. The accuracy of the derived expression is compared numerically using the Galerkin method with other available data for the two limiting conditions of rotationally free and clamped boundaries. Results show that the prediction is within a 5% difference. The influence of rotational restraint and stress gradient upon the buckling load and the associated buckling mode is investigated. Numerical results show sensitivity of the buckling mode to the degree of rotational restraint and the variation of the buckling load with the stress gradient.
On the post-buckling behaviour of plates under stress gradient
Bedair, Osama K. ;
Structural Engineering and Mechanics, volume 4, issue 4, 1996, Pages 397~413
DOI : 10.12989/sem.19126.96.36.1997
In this paper the elastic post-buckling behaviour of plates under non-uniform compressive edge stress is investigated. The compatibility differential equations is first solved analytically and then an approximate solution of the equilibrium equation is obtained using the Galerkin method. Explicit expressions are derived for the load-deflection, ultimate strength and membrane stress distributions. Analytical effective width formulations, based on the characteristics of the stress field of the buckled plate, are proposed for this general loading condition. The predicted load-deflection expression is compared with independent test results. Results are also presented detailing the load-deflection behaviour and stress distribution for various aspect ratios.
A spline finite element method on mapping
Ding, Hanshan ; Shao, Rongguang ; Ding, Dajun ;
Structural Engineering and Mechanics, volume 4, issue 4, 1996, Pages 415~424
DOI : 10.12989/sem.19188.8.131.525
This paper presents a newly suggested calculation method in which an arbitrary quadrilateral element with curved sides is transformed to a normal rectangular one by mapping of coordinates, then the two-dimensional spline is adopted to approach the displacement function of this element. Finally the solution can be obtained by the least-energy principle. Thereby, the application field of Spline Finite Element Method will be extended.
Application of the first-order perturbation method to optimal structural design
Lee, Byung Woo ; Lim, O Kaung ;
Structural Engineering and Mechanics, volume 4, issue 4, 1996, Pages 425~436
DOI : 10.12989/sem.19184.108.40.2065
An application of the perturbation method to optimum structural design with random parameters is presented. It is formulated on the basis of the first-order stochastic finite element perturbation method. It also takes into full account the stress, displacement and eigenvalue constraints, together with the rates of change of the random variables. A method for calculating the sensitivity coefficients in regard to the governing equation and the first-order perturbed equation has been derived, by using a direct differentiation approach. A gradient-based nonlinear programming technique is used to solve the problem. The numerical results are specifically noted, where the stiffness parameter and external load are treated as random variables.
Nonlinear finite element analysis of fibre reinforced concrete deep beams
Swaddiwudhipong, S. ;
Structural Engineering and Mechanics, volume 4, issue 4, 1996, Pages 437~450
DOI : 10.12989/sem.19220.127.116.117
A study on the behaviour of fibre reinforced concrete deep beams with and without web openings is carried out using nonlinear finite element analysis. Eight node isoparametric plane stress elements are employed to model the fibre reinforced concrete materials. Steel bars are treated using a compatible three node truss elements. The constitutive equations for fibre reinforced concrete materials take into account the softening effect of co-existing shear strains. Element stiffness at each step is formulated based on the tangent modulus at the current level of principal strains. Transformation between principal directions and global coordinate system is imposed. Comparison of analytical results with experimental values indicates reasonably good agreement. The proposed numerical model can be used to study the behaviour of this composite structures of practically any geometries.
Buckling of cylindrical shells under external pressure proposition of a new shape of self-stiffened shell
Araar, M. ; Jullien, J.F. ;
Structural Engineering and Mechanics, volume 4, issue 4, 1996, Pages 451~460
DOI : 10.12989/sem.1918.104.22.1681
We propose a new shape of cylindrical shell formed by multiples vaults which gives a self-stiffening against buckling. By an experimental and numerical study of cylindrical shells with a repeated defect, on the circumferential direction made only of outside oriented wave-defects, we show that multiple vault cylindrical shells can have a good behaviour in buckling. An optimal behaviour is obtained by optimization of the vaults number, with conduces to a special multiple vault cylindrical shell named "ASTER shell".
Discussion - Simplified dynamic analysis of slender tapered thin-walled towers with additional mass and rigidity
Laura, P.A.A. ;
Structural Engineering and Mechanics, volume 4, issue 4, 1996, Pages 462~465
DOI : 10.12989/sem.1922.214.171.1242