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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Association for Spatial Structures
Journal Basic Information
Journal DOI :
Korean Association for Spatial Structures
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Volume & Issues
Volume 7, Issue 6 - Dec 2007
Volume 7, Issue 5 - Oct 2007
Volume 7, Issue 4 - Aug 2007
Volume 7, Issue 3 - Jun 2007
Volume 7, Issue 2 - Apr 2007
Volume 7, Issue 1 - Feb 2007
Selecting the target year
Efficient Design of Longitudinally Profiled Plate Girder
Hahm, Hyung-Gil ; Han, Sung-Nam ; Kim, Kyoung-Nam ; Lee, Seong-Haeng ;
Journal of the Korean Association for Spatial Structures, volume 7, issue 5, 2007, Pages 39~48
Recently, the trend of construction has been concentrated on the development of structural systems improved economically. As a result, the usage of High Performance Steel which simplifies the girder structures and shortens the construction time is increasing. Also the interest in Longitudinally Profiled(LP) plate as a structural element for girders has been increased. The LP can distribute efficiently the sectional force applied to the structure, and also reduce the self-weight and the number of welding points. The LP plate was developed in Europe originally and its application has been increased rapidly on steel structures in Korea. Though it is used widely and internationally, the study for the LP plate application is rarely performed. In this paper, sectional stress and deflections were analyzed in the different section types by solid element in the finite element method; finally the workability, as well as economical efficiency of the LP plate produced in Korea was evaluated.
Application of Semi-active TMD for Floor Vibration Control
Kim, Gee-Cheol ; Kwak, Chul-Seung ;
Journal of the Korean Association for Spatial Structures, volume 7, issue 5, 2007, Pages 49~56
Passive, active and semi-active control system are classified in floor vibration control system by providing control force. This paper discusses the application of a new class of semi-active TMD(MR-TMD), for the reduction or floor vibrations due to machine and human movements. This MR-TMD consists of passive TMD and MR damper. Here, displacement-based control methods are used to assess the performance of this STMD(MR-TMD). And, skyhook and the groundhook algorithm are applied to a single degree of freedom system representative of building floors. If the allowed operation space of tuned mass is limited in MR-TMD system, skyhook algorithm is more efficient than groundhook algorithm for floor vibration control. Hybrid control method demonstrates the efficiency of MR-TMD with respect to another methods.
Vibration Characteristics and the Serviceability Evaluation of High-rise Building during Strong Wind
Yoon, Sung-Won ; Kim, Do-Hyun ; Jeong, Sug-Chang ; Kim, Dong-Won ;
Journal of the Korean Association for Spatial Structures, volume 7, issue 5, 2007, Pages 57~65
After measuring wind induced response for a high-rise steel building, the damping ratio and natural frequency were analyzed in this paper. In order to examine amplitude dependence, random decrement method was used. Two methods were analyzed by comparing dynamic properties from random decrement method and half powered-band width method. In addition, through serviceability evaluation during strong wind, compatibility of two methods to Japanese guidelines for the evaluation of habitability to building vibration and national building code of Canada was considered. The amplitude dependence of the damping ratio by RD method was shown and the amplitude dependence of the natural frequency was relatively very small in an aspect of engineering sense. Moreover, the measured building was satisfied with serviceability and Japanese guideline is stricter than NBCC code.
Topology Optimization of General Plate Structures by Using Unsymmetric Layered Artificial Material Model
Park, Gyeong-Im ; Lee, Sang-Jin ;
Journal of the Korean Association for Spatial Structures, volume 7, issue 5, 2007, Pages 67~74
The unsymmetrically layered artificial material model is consistently introduced to find the optimum topologies of the plate structures. Reissner-Mindlin (RM) plate theory is adopted to formulate the present 9-node plate element considering the first-order shear deformation of the plates. In the topology optimization process, the strain energy to be minimized is employed as the objective function and the initial volume of structures is adopted as the constraint function. In addition, the resizing algorithm based on the optimality criteria is used to update the hole size introduced in the proposed artificial material model. Several numerical examples are rallied out to investigate the performance of the proposed technique. From numerical results, the proposed topology optimization techniques are found to be very effective to produce the optimum topology of plate structures. In particular, the proposed unsymmetric stiffening layer model make it possible to produce more realistic stiffener design of the plate structures.
Acoustic Characteristics of Sound Field in Partially Opened Rooms -Emphasis on Vertical Coupling of Diffuse and Free Field-
Jeong, Dae-Up ; Choi, Young-Ji ;
Journal of the Korean Association for Spatial Structures, volume 7, issue 5, 2007, Pages 75~82
The present work measured and analyzed changes in the acoustics of a sound field which has a retractable ceiling. An 1/20 scale model of an openable space was built and measurement was carried out by varying the opened area of a ceiling. The most widely used room acoustic and design parameters, RT, EDT, and D50 were investigated. The results suggest that the use of RT as an acoustic design parameter may not be proper in an openable space and further it is likely to mislead the initial acoustic design of such spaces. It is mainly due to the characteristics of RT in which non-exponential decay processes are linearly fitted. Early decay times were found to be decreased in proportion to increaing the ratio of opened area. D50, an index of speech intelligibility, was effectively shows the influence of openings on the acoustics. It is also found that EDT and D50 at the seats, not directly exposed to the opened part of a ceiling, were almost linearly decreased in proportion to the ratio of opened area, while little influence was found for the opening ratio larger than 40% at the directly exposed seats to the opened part of a ceiling.
Elastic Critical Loads of Tapered Compression Members with Simply Supported Ends
Song, Chang-Young ;
Journal of the Korean Association for Spatial Structures, volume 7, issue 5, 2007, Pages 83~87
Elastic critical loads of sinusoidally tapered bars with simply supported ends are determined by finite element method. The parameters considered in the analysis are taper parameter (=a) and section property parameter (=m). The analysis result for the special case of porismatic bar (a=0) shows good agreement with the existing value. The changes of the critical load coefficients are expressed by an algebraic equation. The coefficients appearing in the equations are determined by regression technique. The critical loads coefficients estimated by the proposed equations reveal little errors when they are compared with those determined by finite element method.