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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 6, Issue 8 - Dec 1998
Volume 6, Issue 7 - Oct 1998
Volume 6, Issue 6 - Sep 1998
Volume 6, Issue 5 - Jul 1998
Volume 6, Issue 4 - Jun 1998
Volume 6, Issue 3 - Apr 1998
Volume 6, Issue 2 - Mar 1998
Volume 6, Issue 1 - Jan 1998
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Contact surface element method for two-dimensional elastic contact problems
Liu, Zhengxing ; Yang, Yaowen ; Williams, F.W. ; Jemah, A.K. ;
Structural Engineering and Mechanics, volume 6, issue 4, 1998, Pages 363~375
DOI : 10.12989/sem.19220.127.116.113
The stiffness matrix of a two-dimensional contact surface element is deduced from the principle of virtual work. The incremental loading procedure used is controlled by displacement and stress. Special potential contact elements are used to avoid the need to rearrange the FEM mesh due to variations of the contact surface as contact develops. Published results are used to validate the method, which is then applied to a turbine to solve the contact problem between the blade root and rotor in the region in which a `push fit` connects the blade to its rotor.
Stochastic response analysis of visco-elastic slit shear walls
Kwan, A.K.H. ; Tian, Q.L. ; Cheung, Y.K. ;
Structural Engineering and Mechanics, volume 6, issue 4, 1998, Pages 377~394
DOI : 10.12989/sem.1918.104.22.1687
Slit shear walls an reinforced concrete shear wall structures with purposely built-in vertical slits. If the slits are inserted with visco-elastic damping materials, the shear walls will become viscoelastic sandwich beams. When adequately designed, this kind of structures can be quite effective in resisting earthquake loads. Herein, a simple analysis method is developed for the evaluation of the stochastic responses of visco-elastic slit shear walls. In the proposed method, the stiffness and mass matrices are derived by using Rayleigh-Ritz method, and the responses of the structures are calculated by means of complex modal analysis. Apart from slit shear walls, this analysis method is also applicable to coupled shear walls and cantilevered sandwich beams. Numerical examples are presented and the results clearly show that the seismic responses of shear wall structures can be substantially reduced by incorporating vertical slits into the walls and inserting visco-elastic damping materials into the slits.
A finite element yield line model for the analysis of reinforced concrete plates
Rasmussen, L.J. ; Baker, G. ;
Structural Engineering and Mechanics, volume 6, issue 4, 1998, Pages 395~409
DOI : 10.12989/sem.1922.214.171.1245
This paper concerns the development and implementation of an orthotropic, stress resultant elasto-plastic finite element model for the collapse load analysis of reinforced concrete plates. The model implements yield line plasticity theory for reinforced concrete. The behaviour of the yield functions are studied, and modifications introduced to ensure a robust finite element model of cases involving bending and twisting stress resultants (
). Onset of plasticity is always governed by the general yield-line-model (YLM), but in some cases a switch to the stress resultant form of the von Mises function is used to ensure the proper evolution of plastic strains. Case studies are presented, involving isotropic and orthotropic plates, to assess the behaviour of the yield line approach. The YLM function is shown to perform extremely well, in predicting both the collapse loads and failure mechanisms.
New stability equation for columns in unbraced frames
Essa, Hesham S. ;
Structural Engineering and Mechanics, volume 6, issue 4, 1998, Pages 411~425
DOI : 10.12989/sem.19126.96.36.1991
The effective length factor of a framed column may be determined by means of the alignment chart procedure. This method is based on many unrealistic assumptions, among which is that all columns have the same stiffness parameter, which is dependent on the length, axial load, and moment of inertia of the column. A new approximate method is developed for the determination of effective length factors for columns in unbraced frames. This method takes into account the effects of inelastic column behaviour, far end conditions of the restraining beams and columns, semi-rigid beam-to-column connections, and differentiated stiffness parameters of columns. This method may be implemented on a microcomputer. A numerical study was carried out to demonstrate the extent to which the involved parameters affect the K factor. The beam-to-column connection stiffness, the stiffness parameter of columns, and the far end conditions of restraining members have a significant effect on the K factor of the column under investigation. The developed method is recommended for design purposes.
Stiffness values and static analysis of flat plate structures
Unluoglu, Esref ;
Structural Engineering and Mechanics, volume 6, issue 4, 1998, Pages 427~437
DOI : 10.12989/sem.19188.8.131.527
Flat plate constructions are structural systems which are directly placed on columns without any beams. Various solution methods have been introduced for the solution of flat plate structures under horizontal and vertical loads. In most of these solution methods, models comprising of one column and one plate have been studied. In other solutions, however, co-behavior of two reciprocal columns has been investigated. In this study, interrelations of all the columns on one storey have been examined. At the end of the study structure consisting of nine columns and four plates has been chosen as a model. Then unit moment has been successively applied to each of these columns and unit moments carried over the other columns have been found. By working out solutions far plates and columns varying in ratio, carry-over factors have been found and these factors given in tables. In addition, fixed-end moment factors on the columns arising due to vertical load were also calculated. Then citing slope-deflection equations to which these results could be applied, some examples of moment and horizontal equilibrium equations have been given.
Lessons from the analysis of a 3-D concrete shear wall
Vecchio, F.J. ;
Structural Engineering and Mechanics, volume 6, issue 4, 1998, Pages 439~455
DOI : 10.12989/sem.19184.108.40.2069
A three-dimensional static nonlinear finite element analysis was performed on the NUPEC large-scale flanged shear wall, which was the subject of an international study program. Details of the constitutive models and analysis procedures used are provided, and the results of the analysis are presented and discussed. The analytical results are compared to the experimentally observed behaviour, and reasonable correlation is observed. Deficiencies in the modelling are identified. In addition, a parametric study is undertaken to investigate factors and mechanisms influencing both the observed behaviour and the calculated response. Finally, a cyclic load analysis of the wall is described and discussed. The paper serves to point out aspects in modelling that are critical to both producing realistic results, and correctly interpreting those results.
Elastodyamic analysis of torsion of shaft of revolution by line-loaded integral equation method
Yun, Tian Quan ;
Structural Engineering and Mechanics, volume 6, issue 4, 1998, Pages 457~466
DOI : 10.12989/sem.19220.127.116.117
The dynamic response of an elastic torsion shaft of revolution is analysed by the Line-Loaded Integral Equation Method (LLIEM). A "Dynamic Point Ring Couple" (DPRC) is used as a fictitious fundamental load and is distributed in an elastic space along the axis of the shaft outside the shaft occupation. According to the boundary condition, our problem is reduced to a 1-D Fredholm integral equation of the first kind, which is simpler for solving than that of a 2-D singular integral equation of the same kind obtanied by Boundary Element Method (BEM), for steady periodically varied loading. Numerical example of a shaft with quadratic generator under sinusoidal type of torque is given. Formulas for stresses and dangerous frequency are mentioned.
A mathematical model to predict fatigue notch factor of butt joints
Nguyen, Ninh T. ; Wahab, M.A. ;
Structural Engineering and Mechanics, volume 6, issue 4, 1998, Pages 467~471
DOI : 10.12989/sem.1918.104.22.1687
A mathematical model is developed to predict the fatigue notch factor of butt welds subject to number of parameters such as weld geometry, residual stresses under dynamic combined loading conditions (tensile and bending). Linear elastic fracture mechanics, finite element analysis, dimensional analysis and superposition approaches are used for the modelling. The predicted results are in good agreement with the available experimental data. As a result, scatters of the fatigue data can be significantly reduced by plotting S-N curve as (
) vs. N.