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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 & Issues
Volume 8, Issue 6 - Dec 1999
Volume 8, Issue 5 - Nov 1999
Volume 8, Issue 4 - Oct 1999
Volume 8, Issue 3 - Sep 1999
Volume 8, Issue 2 - Aug 1999
Volume 8, Issue 1 - Jul 1999
Volume 7, Issue 6 - Jun 1999
Volume 7, Issue 5 - May 1999
Volume 7, Issue 4 - Apr 1999
Volume 7, Issue 3 - Mar 1999
Volume 7, Issue 2 - Feb 1999
Volume 7, Issue 1 - Jan 1999
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An approach for calculating the failure loads of unprotected concrete filled steel columns exposed to fire
Wang, Y.C. ; Kodur, V.K.R. ;
Structural Engineering and Mechanics, volume 7, issue 2, 1999, Pages 127~145
DOI : 10.12989/sem.1918.104.22.168
This paper deals with the development of an approach for evaluating the squash load and rigidity of unprotected concrete filled steel columns at elevated temperatures. The current approach of evaluating these properties is reviewed. It is shown that with a non-uniform temperature distribution, over the composite cross-section, the calculations for the squash load and rigidity are tedious in the current method. A simplified approach is proposed to evaluate the temperature distribution, squash load, and rigidity of composite columns. This approach is based on the model in Eurocode 4 and can conveniently be used to calculate the resistance to axial compression of a concrete filled steel column for any fire resistance time. The accuracy of the proposed approach is assessed by comparing the predicted strengths against the results of fire tests on concrete filled circular and square steel columns. The applicability of the proposed approach to a design situation is illustrated through a numerical example.
Analytical methodology for solving anisotropic materials of antiplane problems
Ma, Chien-Ching ; Cheng, Yih-Hong ;
Structural Engineering and Mechanics, volume 7, issue 2, 1999, Pages 147~157
DOI : 10.12989/sem.1922.214.171.124
An analytical methodology for solving antiplane problem of anisotropic materials is proposed and discussed in detail in this study. The material considered in this study possesses a symmetry plane at z=0. The relationship between the problems of anisotropic materials and the corresponding isotropic problems are established by Ma (1996) on the basis of the general solutions for the shear stresses and displacement in both the polar and Cartesian coordinate systems. This implies that any solution of an anisotropic problem can be obtained by solving a corresponding isotropic problem. In this study some examples and numerical results are presented as an explanation of how the complicated anisotropic problem could be solved by the associated simpler isotropic problem.
Fundamental theory of curved structures from a non-tensorial point of view
Paavola, Juha ; Salonen, Eero-Matti ;
Structural Engineering and Mechanics, volume 7, issue 2, 1999, Pages 159~180
DOI : 10.12989/sem.19126.96.36.199
The present paper shows a new non-tensorial approach to derive basic equations for various structural analyses. It can be used directly in numerical computation procedures. The aim of the paper is, however, to show that the approach serves as an excellent tool for analytical purposes also, working as a link between analytical and numerical techniques. The paper gives a method to derive, at first, expressions for strains in general beam and shell analyses, and secondly, the governing equilibrium equations. The approach is based on the utilization of local fixed Cartesian coordinate systems. Applying these, all the definitions required are the simple basic ones, well-known from the analyses in common global coordinates. In addition, the familiar principle of virtual work has been adopted. The method will be, apparently, most powerful in teaching the theories of curved beam and shell structures for students not familiar with tensor analysis. The final results obtained have no novelty value in themselves, but the procedure developed opens through its systematic and graphic progress a new standpoint to theoretical considerations.
Elasticity solution and free vibrations analysis of laminated anisotropic cylindrical shells
Shakeri, M. ; Eslami, M.R. ; Yas, M.H. ;
Structural Engineering and Mechanics, volume 7, issue 2, 1999, Pages 181~202
DOI : 10.12989/sem.19188.8.131.52
Dynamic response of axisymmetric arbitrary laminated composite cylindrical shell of finite length, using three-dimensional elasticity equations are studied. The shell is simply supported at both ends. The highly coupled partial differential equations are reduced to ordinary differential equations (ODE) with variable coefficients by means of trigonometric function expansion in axial direction. For cylindrical shell under dynamic load, the resulting differential equations are solved by Galerkin finite element method, In this solution, the continuity conditions between any two layer is satisfied. It is found that the difference between elasticity solution (ES) and higher order shear deformation theory (HSD) become higher for a symmetric laminations than their unsymmetric counterpart. That is due to the effect of bending-streching coupling. It is also found that due to the discontinuity of inplane stresses at the interface of the laminate, the slope of transverse normal and shear stresses aren't continuous across the interface. For free vibration analysis, through dividing each layer into thin laminas, the variable coefficients in ODE become constants and the resulting equations can be solved exactly. It is shown that the natural frequency of symmetric angle-ply are generally higher than their antisymmetric counterpart. Also the results are in good agreement with similar results found in literatures.
A simple method of stiffness matrix formulation based on single element test
Mau, S.T. ;
Structural Engineering and Mechanics, volume 7, issue 2, 1999, Pages 203~216
DOI : 10.12989/sem.19184.108.40.206
A previously proposed finite element formulation method is refined and modified to generate a new type of elements. The method is based on selecting a set of general solution modes for element formulation. The constant strain modes and higher order modes are selected and the formulation method is designed to ensure that the element will pass the basic single element test, which in turn ensures the passage of the basic patch test. If the element is to pass the higher order patch test also, the element stiffness matrix is in general asymmetric. The element stiffness matrix depends only on a nodal displacement matrix and a nodal force matrix. A symmetric stiffness matrix can be obtained by either modifying the nodal displacement matrix or the nodal force matrix. It is shown that both modifications lead to the same new element, which is demonstrated through numerical examples to be more robust than an assumed stress hybrid element in plane stress application. The method of formulation can also be used to arrive at the conforming displacement and hybrid stress formulations. The convergence of the latter two is explained from the point of view of the proposed method.
Effect of soil-structure interaction on the reliability of hyperbolic cooling towers
Liao, Wen ; Lu, Wenda ; Liu, Renhuai ;
Structural Engineering and Mechanics, volume 7, issue 2, 1999, Pages 217~224
DOI : 10.12989/sem.19220.127.116.11
A semi-stochastic process model of reliability was established for hyperbolic cooling towers subjected to combined loadings of wind force, self-weight, temperature loading. Effect of the soil-structure interaction on reliability was evaluated. By involving the gust factor, an equivalent static scheme was employed to convert the dynamic model to static model. The TR combination rule was used to consider relations between load responses. An analysis example was made on the 90M cooling tower of Maoming, Guangdong of China. Numerical results show that the design not including interaction turns to be conservative.
Viscoelastic constitutive modeling of asphalt concrete with growing damage
Lee, Hyun-Jong ; Kim, Y. Richard ; Kim, Sun-Hoon ;
Structural Engineering and Mechanics, volume 7, issue 2, 1999, Pages 225~240
DOI : 10.12989/sem.1918.104.22.168
This paper presents a mechanistic approach to uniaxial viscoelastic constitutive modeling of asphalt concrete that accounts for damage evolution under cyclic loading conditions. An elasticviscoelastic correspondence principle in terms of pseudo variables is applied to separately evaluate viscoelasticity and time-dependent damage growth in asphalt concrete. The time-dependent damage growth in asphalt concrete is modeled by using a damage parameter based on a generalization of microcrack growth law. Internal state variables that describe the hysteretic behavior of asphalt concrete are determined. A constitutive equation in terms of stress and pseudo strain is first established for controlled-strain mode and then transformed to a controlled-stress constitutive equation by simply replacing physical stress and pseudo strain with pseudo stress and physical strain. Tensile uniaxial fatigue tests are performed under the controlled-strain mode to determine model parameters. The constitutive equations in terms of pseudo strain and pseudo stress satisfactorily predict the constitutive behavior of asphalt concrete all the way up to failure under controlled-strain and -stress modes, respectively.