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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 10, Issue 6 - Dec 2000
Volume 10, Issue 5 - Nov 2000
Volume 10, Issue 4 - Oct 2000
Volume 10, Issue 3 - Sep 2000
Volume 10, Issue 2 - Aug 2000
Volume 10, Issue 1 - Jul 2000
Volume 9, Issue 6 - Jun 2000
Volume 9, Issue 5 - May 2000
Volume 9, Issue 4 - Apr 2000
Volume 9, Issue 3 - Mar 2000
Volume 9, Issue 2 - Feb 2000
Volume 9, Issue 1 - Jan 2000
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Nonlinear vibration of Timoshenko beam due to moving loads including the effects of weight and longitudinal inertia of beam
Wang, Rong-Tyai ;
Structural Engineering and Mechanics, volume 10, issue 3, 2000, Pages 197~209
DOI : 10.12989/sem.2000.10.3.197
The effects of weight and axial inertia of a beam are taken into account for studying the nonlinear vibration of the Timoshenko beam due to external loads. The combination of Galerkins method and Runge-Kutta method are employed to obtain the dynamic responses of the beam. A concentrated force and a two-axle vehicle traversing on the beam are taken as two examples to investigate the response characteristics of the beam. Results show that the effect of axial inertia of the beam increases the fundamental period of the beam. Further, both the dynamic deflection and the dynamic moment of the beam obtained with including the effect of axial inertia of the beam are greater than those of the beam without including that effect of the beam.
Retrofitting reinforced concrete beams by bolting steel plates to their sides -Part 1: Behaviour and experiments
Ahmed, Marfique ; Oehlers, Deric John ; Bradford, Mark Andrew ;
Structural Engineering and Mechanics, volume 10, issue 3, 2000, Pages 211~226
DOI : 10.12989/sem.2000.10.3.211
A procedure has been developed for bolting steel plates to the sides of existing reinforced concrete beams which can be used to increase the shear strength of beams, increase the flexural strength of beams with enhanced ductility or with only a small loss of ductility, and increase the stiffness of beams in order to reduce deflections and crack widths. It will be shown in this paper, through a qualitative analysis and through the results of testing eight large scale beams, that standard rigid plastic analysis techniques which are commonly used in the design of reinforced-concrete, steel, and composite steel and concrete beams cannot be used directly to design composite bolted-plated reinforced-concrete beams. In the companion paper, quantitative procedures will be used to adapt the standard rigid plastic analysis techniques for this relatively new form of retrofitting.
Retrofitting reinforced concrete beams by bolting steel plates to their sides -Part 2: Transverse interaction and rigid plastic design
Oehlers, Deric John ; Ahmed, Marfique ; Nguyen, Ninh T. ; Bradford, Mark Andrew ;
Structural Engineering and Mechanics, volume 10, issue 3, 2000, Pages 227~243
DOI : 10.12989/sem.2000.10.3.227
In a companion paper, tests on bolted side plated beams have shown that side plates can substantially increase the strength of existing reinforced concrete beams with little if any loss of ductility and, furthermore, induce a gradual mode of failure after commencement of concrete crushing. However, it was also shown that transverse interaction between the side plates and the reinforced concrete beam, that is vertical slip and which is a concept unique to side plated beams, is detrimental. Transverse interaction increases the forces on the bolt shear connectors and, hence, weakens the beam. It also reduces the ability of the composite plated beam to yield and, hence, to attain its full flexural capacity. The generic concept of transverse interaction will be described in this paper and the results used to develop a new form of rigid plastic analysis for bolted side plated beams which is illustrated with an application.
Deformational characteristics of a high-vacuum insulation panel
Shu, Hung-Shan ; Wang, Yang-Cheng ;
Structural Engineering and Mechanics, volume 10, issue 3, 2000, Pages 245~262
DOI : 10.12989/sem.2000.10.3.245
The objective of this study is to analyze the deformational characteristics of a high-vacuum insulation panel that is evacuated to eliminate significant gas-phase conductance through its thickness. The panel is composed of a metal envelope and low thermal conductance spacers. The problem is very challenging because several nonlinearities are involved concurrently. Not only are various finite element models such as triangular, rectangular, beam and circular plate models used to simulate the panel, but also several finite element programs are used to solve the problem based on the characteristics of the finite element model. The numerical results indicate that the effect of the diameter of the spacer on the vertical deformation of the plate panel is negligibly small. The parameter that mainly influences the maximum sag is the spacing between the spacers. The maximum vertical deformation of the panel can be predicted for a practical range of the spacing between the spacers and the thickness of the plate. Compared with the numerical results obtained by the finite element models and the experimental tests, they have a good agreement. The results are represented in both tabular and graphical forms. In order to make the results useful, a curve fitting technique has been applied to predict the maximum deformation of the panel with various parameters. Moreover, the panel was suggested to be a "smart" structure based on thermal effect.
Free vibration of core wall structure coupled with connecting beams
Wang, Quanfeng ;
Structural Engineering and Mechanics, volume 10, issue 3, 2000, Pages 263~275
DOI : 10.12989/sem.2000.10.3.263
In this paper, a core wall structure coupled with connecting beams is discretized and modeled as an equivalent thin-walled member with closed section, while the connecting beams between openings are replaced by an equivalent shear diaphragm. Then, a numerical method (finite member element method, FMEM) for dynamic analysis of the core wall structure is proposed. The numerical method combines the advantages of the FMEM and Vlasov's thin-walled beam theory and the effects of torsion, warping and, especially, the shearing strains in the middle surface of the walls are considered. The results presented in this paper are very promising compared with the ones obtained from finite element method.
A simplified dynamic analysis for estimation of the effect of rotary inertia and diaphragmatic operation on the behaviour of towers with additional masses
Michaltsos, G.T. ; Konstantakopoulos, T.G. ;
Structural Engineering and Mechanics, volume 10, issue 3, 2000, Pages 277~288
DOI : 10.12989/sem.2000.10.3.277
The present paper, deals with the dynamic analysis of a thin-walled tower with varying cross-section and additional masses. It, especially, deals with the effect of the rotary inertia of those masses, which have been neglected up to now. Using Galerkin's method, we can find the spectrum of the eigenfrequencies and, also, the shape functions. Finally, we can solve the equations of the problem of the forced vibrations, by using Carson-Laplace's transformation. Applying this method on a tall mast with 2 concentrated masses, we can examine the effect of the rotary inertia and the diaphragmatic operation of the above masses, on the 3 first eigenfrequencies.
An analytical solution to the laminated piezoelectric beam under the electric field
Lin, Qirong ; Jin, Zhanli ; Liu, Zhengxing ;
Structural Engineering and Mechanics, volume 10, issue 3, 2000, Pages 289~298
DOI : 10.12989/sem.2000.10.3.289
Based on the two-dimensional constitutive relationship of the piezoelastic material, this paper derived an analytic solution to the elastic beam with the piezoelectric layer under the electric field, presented the explicit expressions of its displacement and stress. It is helpful for understanding the electrical and mechanical behavior of piezoelectric materials as actuators and the validation of the numerical methods such as FEM.