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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 2, Issue 4 - Dec 1994
Volume 2, Issue 3 - Sep 1994
Volume 2, Issue 2 - Jun 1994
Volume 2, Issue 1 - Mar 1994
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Numerical simulation of the crack propagation behavior in 3D elastic body
Taniguchi, Takeo ; Miyaji, Akihiko ; Suetsugu, Takeshi ; Matsunaga, Shohgo ;
Structural Engineering and Mechanics, volume 2, issue 3, 1994, Pages 227~244
DOI : 10.12989/sem.19126.96.36.199
The purpose of this investigation is to propose a numerical simulation method of the crack propagation behavior in 3-dimensionl elastic body. The simulation method is based on the displacement-type finite element method, and the linear fracture theory is introduced. The results from the proposed method are compared with those from the structural experiments, and the good coincidences between them are shown in this paper. At the same time, 2-dimensional analysis is also done, and the results are compared with those obtained from 3-dimensional analysis and the structural experiments.
Stress intensity factors for 3-D axisymmetric bodies containing cracks by p-version of F.E.M.
Woo, Kwang S. ; Jung, Woo S. ;
Structural Engineering and Mechanics, volume 2, issue 3, 1994, Pages 245~256
DOI : 10.12989/sem.19188.8.131.52
A new axisymmetric crack model is proposed on the basis of p-version of the finite element method limited to theory of small scale yielding. To this end, axisymmetric stress element is formulated by integrals of Legendre polynomial which has hierarchical nature and orthogonality relationship. The virtual crack extension method has been adopted to calculate the stress intensity factors for 3-D axisymmetric cracked bodies where the potential energy change as a function of position along the crack front is calculated. The sensitivity with respect to the aspect ratio and Poisson locking has been tested to ascertain the robustness of p-version axisymmetric element. Also, the limit value that is an exact solution obtained by FEM when degree of freedom is infinite can be estimated using the extrapolation equation based on error prediction in energy norm. Numerical examples of thick-walled cylinder, axisymmetric crack in a round bar and internal part-thorough cracked pipes are tested with high precision.
Motion of rigid unsymmetric bodies and coefficient of friction by earthquake excitations
Zadnik, Branko ;
Structural Engineering and Mechanics, volume 2, issue 3, 1994, Pages 257~267
DOI : 10.12989/sem.19184.108.40.2067
Motions of an unsymmetric rigid body on a rigid floor subjected to earthquake excitations with special attention to coefficient of friction are investigated. Motions of a body in a plane are classified (Ishiyama 1980) into six types, i.e. (1) rest, (2) slide, (3) rotation, (4) slide rotation, (5) translation jump, (6) rotation jump. Based upon the theoretical and experimental research work special attention is paid to the sliding of a body. The equations of motions and the behavior of coefficient of friction in the time of floor excitation are studied. One of the features of this investigation is the introduction and estimation of the "time dependent" coefficient of friction. It has been established that the constant kinetic coefficient of friction
does not give the appropriate results. The method for the estimation of the friction coefficient variation during the time is given.
Analysis and tests of flexibly connected thin-walled channel frames
Tan, S.H. ; Seah, L.K. ;
Structural Engineering and Mechanics, volume 2, issue 3, 1994, Pages 269~284
DOI : 10.12989/sem.19220.127.116.119
The analysis and tests of thin-walled channel frames including nonlinear flexible or semi-rigid connection behaviour is presented. The semi-rigid connection behaviour is modelled using a mathematical approximation of the connection flexibility-moment relationship. Local instability such as local buckling and torsional flexural buckling of the member are included in the analysis. The full response of the frame, up to the collapse load, can be predicted. Experimental investigation was carried out on a series of simple double storey symmetrical frames with the purpose of verifying the accuracy and validity of the analysis. Agreement between the theoretical and experimental results is acceptable. The investigation also shows that connection flexibility and local instability such as local buckling and torsional flexural buckling can affect the behaviour and strength of thin-walled frames significantly. The results can also provide further insight into the advanced study of practical structures where interaction between flexible connections and phenomenon associated with thin-walled members are present.
Direct Ritz method for random seismic response for non-uniform beams
Lin, J.H. ; Williams, F.W. ; Bennett, P.N. ;
Structural Engineering and Mechanics, volume 2, issue 3, 1994, Pages 285~294
DOI : 10.12989/sem.1918.104.22.1685
Based on a fast and accurate method for the stationary random seismic response analysis for discretized structures(Lin 1992, Lin et al. 1992), a Ritz method for dealing with such responses of continuous systems in developed. This method is studied quantitatively, using cantilever shear beams for simplicity and clarity. The process can be naturally extended to deal with various boundary conditions as well as non-uniform Bernoulli-Euler beams, or even Timoshenko beams. Algorithms for both proportionally and non-proportionally damped responses are described. For all of such damping cases, it is not necessary to solve for the natural vibrations of the beams. The solution procedure is very simple, and equally efficient for a white or a non-white ground excitation spectrum. Two examples are given where various power spectral density functions, variances, covariances and second spectral moments of displacement, internal force response, and their derivatives are calculated and analyses. Some Ritz solutions are compared with "exact" CQC solutions.
On the numerical assessment of the separation zones in semirigid column base plate connections
Baniotopoulos, C.C. ;
Structural Engineering and Mechanics, volume 2, issue 3, 1994, Pages 295~309
DOI : 10.12989/sem.1922.214.171.1245
The present paper concerns the mathematical study and the numerical treatment of the problem of semirigid connections in bolted steel column base plates by taking into account the possibility of appearance of separation phenomena on the contact surface under certain loading conditions. In order to obtain a convenient discrete form to simulate the structural behaviour of a steel column base plate, the continuous contact problem is first formulated as a variational inequality problem or, equivalently, as a quadratic programming problem. By applying an appropriate finite element scheme, the discrete problem is formulated as a quadratic optimization problem which expresses, from the standpoint of Mechanics, the principle of minimum potential energy of the semirigid connection at the state of equilibrium. For the numerical treatment of this problem, two effective and easy-to-use solution strategies based on quadratic optimization algorithms are proposed. This technique is illustrated by means of a numerical application.