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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
Selecting the target year
Factors governing redistribution of moment in continuous prestressed concrete beams
Kodur, V.K.R. ; Campbell, T.I. ;
Structural Engineering and Mechanics, volume 8, issue 2, 1999, Pages 119~136
DOI : 10.12989/sem.1922.214.171.124
The failure load of a continuous prestressed concrete beam depends partially on the amount of redistribution of moment that occurs prior to failure. Results from a parametric study, carried out using a nonlinear finite element computer program, are presented to demonstrate the influences of various factors on redistribution of moment in two-span, continuous bonded prestressed concrete beams. Trends in the data from the numerical studies are compared with those from a theoretical expression for percentage of redistribution, and it is shown that the redistribution of moment occurring in a continuous prestressed concrete beam is a function of number of parameters.
Numerical study on RC flat plates subjected to combined axial and transverse load
Park, Honggun ;
Structural Engineering and Mechanics, volume 8, issue 2, 1999, Pages 137~150
DOI : 10.12989/sem.19126.96.36.199
This paper presents a numerical study on the flat plates in deep basements, subjected to floor load and in-plane compressive load due to soil and hydraulic lateral pressure. For nonlinear finite element analysis, a computer program addressing material and geometric nonlinearities is developed. The validity of the numerical model is established by comparison with existing experiments performed on plates simply supported on four edges. The flat plates to be studied are designed according to the Direct Design Method in ACI 318-95. Through numerical study on the effects of different load combinations and loading sequence, the load condition that governs the strength of the flat plates is determined. For plates under the governing load condition, parametric studies are performed to investigate the strength variations with reinforcement ratio, aspect ratio, concrete strength, and slenderness ratio. Based on the numerical results, the floor load magnification factor is proposed.
Nonlinear vibration of Mindlin plate subjected to moving forces including the effect of weight of the plate
Wang, Rong-Tyai ; Kuo, Nai-Yi ;
Structural Engineering and Mechanics, volume 8, issue 2, 1999, Pages 151~164
DOI : 10.12989/sem.19188.8.131.52
The large deflection theory of the Mindlin plate and Galerkin`s method are employed to examine the static responses of a plate produced by the weight of the plate, and the dynamic responses of the plate caused by the coupling effect of these static responses with a set of moving forces. Results obtained by the large deflection theory are compared with those by the small deflection theory. The results indicate that the effect of weight of the plate increases the modal frequencies of the structure. The deviations of dynamic transverse deflection and of dynamic bending moment produced by a moving concentrated force between the two theories are significant for a thin plate with a large area. Both dynamic transverse deflection and dynamic bending moment obtained by the Mindlin plate theory are greater than those by the classical plate.
Cost-based design of residential steel roof systems: A case study
Rajan, S.D. ; Mobasher, B. ; Chen, S.Y. ; Young, C. ;
Structural Engineering and Mechanics, volume 8, issue 2, 1999, Pages 165~180
DOI : 10.12989/sem.19184.108.40.206
The cost effectiveness of using steel roof systems for residential buildings is becoming increasingly apparent with the decrease in manufacturing cost of steel components, reliability and efficiency in construction practices, and the economic and environmental concerns. While steel has been one of the primary materials for structural systems, it is only recently that its use for residential buildings is being explored. A comprehensive system for the design of residential steel roof truss systems is presented. In the first stage of the research the design curves obtained from the AISI-LRFD code for the manufactured cross-sections were verified experimentally. Components of the truss systems were tested in order to determine their member properties when subjected to axial force and bending moments. In addition, the experiments were simulated using finite element analysis to provide an additional source of verification. The second stage of the research involved the development of an integrated design approach that would automatically design a lowest cost roof truss given minimal input. A modified genetic algorithm was used to handle sizing, shape and topology variables in the design problem. The developed methodology was implemented in a software system for the purpose of designing the lowest cost truss that would meet the AISI code provisions and construction requirements given the input parameters. The third stage of the research involved full-scale testing of a typical residential steel roof designed using the developed software system. The full scale testing established the factor of safety while validating the analysis and design procedures. Evaluation of the test results indicates that designs using the present approach provide a structure with enough reserve strength to perform as predicted and are very economical.
Mode localization and frequency loci veering in an aircraft with external stores
Liu, J.K. ; Chan, H.C. ;
Structural Engineering and Mechanics, volume 8, issue 2, 1999, Pages 181~191
DOI : 10.12989/sem.19220.127.116.11
This paper presents an investigation of the mode localization and frequency loci veering phenomena in an aircraft with disordered external stores. Two theoretical analyses are carried out to study the occurring mechanism of the two phenomena: condensation technique in the subspace spanned by modes of interest and geometric mapping theory in the complex plane. Two simple criteria for predicting the occurrence of the mode localization and frequency loci veering are put forward. The prediction of the phenomena by our theoretically proposed criteria is in good agreement with that obtained through numerical calculations of characteristic solutions of the disordered system.
Effects of elastic foundation on the dynamic stability of cylindrical shells
Ng, T.Y. ; Lam, K.Y. ;
Structural Engineering and Mechanics, volume 8, issue 2, 1999, Pages 193~205
DOI : 10.12989/sem.1918.104.22.168
A formulation for the dynamic stability analysis of cylindrical shells resting on elastic foundations is presented. In this previously not studied problem, a normal-mode expansion of the partial differential equations of motion, which includes the effects of the foundation as well as a harmonic axial loading, yields a system of Mathieu-Hill equations the stability of which is analyzed using Bolotin`s method. The present study examines the effects of the elastic foundation on the instability regions of the cylindrical shell for the transverse, longitudinal and circumferential modes.
Defect-free 4-node flat shell element: NMS-4F element
Choi, Chang-Koon ; Lee, Phill-Seung ; Park, Yong-Myung ;
Structural Engineering and Mechanics, volume 8, issue 2, 1999, Pages 207~231
DOI : 10.12989/sem.1922.214.171.124
A versatile 4-node shell element which is useful for the analysis of arbitrary shell structures is presented. The element is developed by flat shell approach, i.e., by combining a membrane element with a Mindlin plate element. The proposed element has six degrees of freedom per node and permits an easy connection to other types of finite elements. In the plate bending part, an improved Mindlin plate has been established by the combined use of the addition of non-conforming displacement modes (N) and the substitute shear strain fields (S). In the membrane part, the nonconforming displacement modes are also added to the displacement fields to improve the behavior of membrane element with drilling degrees of freedom and the modified numerical integration (M) is used to overcome the membrane locking problem. Thus the element is designated as NMS-4F. The rigid link correction technique is adopted to consider the effect of out-of-plane warping. The shell element proposed herein passes the patch tests, does not show any spurious mechanism and does not produce shear and membrane locking phenomena. It is shown that the element produces reliable solutions even for the distorted meshes through the analysis of benchmark problems.