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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 14, Issue 4 - Dec 2014
Volume 14, Issue 3 - Sep 2014
Volume 14, Issue 2 - Jun 2014
Volume 14, Issue 1 - Mar 2014
Selecting the target year
Analysis of Damping Ratio of Foot-bridges
Yoon, Sung-Won ; Moon, Sang-Hyouen ;
Journal of the Korean Association for Spatial Structures, volume 14, issue 4, 2014, Pages 39~46
DOI : 10.9712/KASS.2014.14.4.039
In Seoul, total 27 places of foot-bridges were chosen to evaluate the damping ratio through vibration measurement by mobile-phone application. Model vibration test was performed to compare the natural frequency and damping ratio between the conventional accelerometer and mobile-phone application. Measured average damping was compared with the one of Bachmann. The relation between the damping ratio and span was also investigated. Measured average damping ratio was greater than that of Bachmann. It was shown that there is no distinct trend between damping and span.
A Study on the Evaluation of Structural Properties of Wind Turbine Blade-Part1
Lee, Kyoung-Soo ; Huque, Ziaul ; Kommalapati, Raghava ; Han, Sang-Eul ;
Journal of the Korean Association for Spatial Structures, volume 14, issue 4, 2014, Pages 47~54
DOI : 10.9712/KASS.2014.14.4.047
This paper presents the structural model development and verification processes of wind turbine blade. The National Renewable Energy Laboratory (NREL) Phase VI wind turbine which the wind tunnel and structural test data has publicly available is used for the study. The wind turbine assembled by blades, rotor, nacelle and tower. The wind blade connected to rotor. To make the whole turbine structural model, the mass and stiffness properties of all parts should be clear and given. However the wind blade, hub, nacelle, rotor and power generating machinery parts have difficulties to define the material properties because of the composite and assembling nature of that. Nowadays to increase the power generating coefficient and cost efficiency, the highly accurate aerodynamic loading evaluating technique should be developed. The Fluid-Structure Interaction (FSI) is the emerging new way to evaluate the aerodynamic force on the rotating wind blade. To perform the FSI analysis, the fluid and structural model which are sharing the associated interface topology have to be provided. In this paper, the structural model of blade development and verifying processes have been explained for Part1. In following Part2 paper, the processes of whole turbine system will be discussing.
A Development of Intersecting Tensegrity System and Analysis of Structural Features for Forming Space
Lee, Juna ; Miyasato, Naoya ; Saitoh, Masao ;
Journal of the Korean Association for Spatial Structures, volume 14, issue 4, 2014, Pages 55~64
DOI : 10.9712/KASS.2014.14.4.055
In this study, Intersecting Tensegrity System that is integrated solid compression members with tension members was presented. This system is set up by connecting upper and lower compression members of pyramid shape with exterior tension members. In this system, the solid compression members are intersected each other and connected by a tension member in the center. This system is a variation of Tensegrity system, has a improved feature that the system is able to induce prestresses in all of tension members easily by adjusting the distance of a tension member in the center. The proposed system was studied by modeling, and the structural behavior of the system was investigated by mechanical analysis of the model. Furthermore, the features of the structural behavior variations was investigated when the composition elements(total height, size of surface, intersection length, etc.) are changed variously. It was also showed that the system is able to be used as a temporary space structure system with a membrane roof of inverse conical shape.
Dynamic Characteristic of Composite Beam using the Sandwich Plate System
Ryu, Jae-Ho ; Ju, Young-Kyu ; Yoon, Sung-Won ;
Journal of the Korean Association for Spatial Structures, volume 14, issue 4, 2014, Pages 65~72
DOI : 10.9712/KASS.2014.14.4.065
To improve the noise and vibration problems of the existing public parking systems, new floor system was proposed. This system consists of the Sandwich Plate System(SPS), steel beam and post-tensioned steel tendons. To verify the dynamic characteristics such as the natural frequency and damping ratio of the system, the free vibration test was performed. Test results showed that the natural frequency of the SPS composite beam was 23.8Hz and it was increased by 3.8% by installing the post-tensioned tendons. The damping ratio of the specimen with tendons was about 1.64%.
Experimental Study on the Flexural Behaviour of CFRP-bar NSM R.C Beams depending on Adhesive and Anchorage
Kim, Sung-Won ; Lee, Hyung-Geun ; Yeo, Hwan-Jun ; Park, Sung-Moo ;
Journal of the Korean Association for Spatial Structures, volume 14, issue 4, 2014, Pages 73~80
DOI : 10.9712/KASS.2014.14.4.073
For the last decade many bridges and buildings have experienced flexural strengthening with the fiber reinforced polymer(FRP) bonding system, demands for increasing heavy traffic loads and the changing of the code application. Of the many strengthening systems, NSM(near surface mounted) system with FRP has become attractive and popular way of strengthening for the existed RC structures and many studies and applications of this technique have significantly increased all over the world. Meanwhile, polymer mortar that contains much of the same ingredients as cement but includes the addition of certain polymer resins for enhancing desired physical properties, has been used as an alternative adhesive. This paper focuses on flexural behaviour of CFRP-bar NSM system with variables such as kinds of adhesive, anchorage, sectional aspect ratio. Based on the test results and test-to-predicted ratio, this paper provides researchers and practical engineers a fundamental knowledge and intuition.
A Study on Stability of Arch-Type Vinyl House Structures
Jung, Hwan-Mok ; Yoon, Seok-Ho ;
Journal of the Korean Association for Spatial Structures, volume 14, issue 4, 2014, Pages 81~88
DOI : 10.9712/KASS.2014.14.4.081
Construction of vinyl house structures is increasing because they do not have a large cross section as non-permanent structures. Vinyl house structures are apt to collapse by snow load because they have a small size member as a temporary building. Therefore, it is very important to ensure not only the stiffness of the individual member, but also the overall stability of three-dimensional arch-type vinyl house structures. The purpose of this study is to estimate the stability of arch-type vinyl house structures that have a various curvature under the vertical load such as snow load. As a result of the study, the buckling load of V27 model is the largest, and the values of buckling load have a tendency to increase with increasing H(height of arch) in the case of
, but to decrease with increasing H in the case of
Seismic Response Control of Dome Structure Subjected to Multi-Support Earthquake Excitation
Kim, Gee-Cheol ; Kang, Joo-Won ;
Journal of the Korean Association for Spatial Structures, volume 14, issue 4, 2014, Pages 89~96
DOI : 10.9712/KASS.2014.14.4.089
Spatial structures as like dome structure have the different dynamic characteristics from general rahmen structures. Therefore, it is necessary to accurately analyze dynamic characteristics and effectively control of seismic response of spatial structure subjected to multi-supported excitation. In this study, star dome structure that is subjected to multi-supported excitation was used as an example spatial structure. The response of the star dome structure under multiple support excitation are analyzed by means of the pseudo excitation method. Pseudo excitation method shows that the structural response is divided into two parts, ground displacement and structural dynamic response due to ground motion excitation. And the application of passive tuned mass damper(TMD) to seismic response control of star dome structures has been investigated. From this numerical analysis, it is shown that the seismic response of spatial structure under multiple support seismic excitation are different from those of spatial structure under unique excitation. And it is reasonable to install TMD to the dominant points of each mode. And it is found that the passive TMD could effectively reduce the seismic responses of dome structure subjected to multi-supported excitation.
Optimal Design of Outrigger Damper using Multi-objective Genetic Algorithm
Kim, Hyun-Su ; Yoon, Sung-Wook ; Kang, Joo-Won ;
Journal of the Korean Association for Spatial Structures, volume 14, issue 4, 2014, Pages 97~104
DOI : 10.9712/KASS.2014.14.4.097
Recently, a concept of damped outrigger system has been proposed for tall buildings. Structural characteristics and design method of this system were not sufficiently investigated to date. In this study, control performance of damped outrigger system for building structures subjected to seismic excitations has been investigated. And optimal design method of damped outrigger system has been proposed using multi-objective genetic algorithm. To this end, a simplified numerical model of damped outrigger system has been developed. State-space equation formulation proposed in previous research was used to make a numerical model. Multi-objective genetic algorithms has been employed for optimal design of the stiffness and damping parameters of the outrigger damper. Based on numerical analyses, it has been shown that the damped outrigger system control dynamic responses of the tall buildings subjected to earthquake excitations in comparison with a traditional outrigger system.