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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Association for Spatial Structures
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Journal DOI :
Korean Association for Spatial Structures
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Volume & Issues
Volume 8, Issue 6 - Dec 2008
Volume 8, Issue 5 - Oct 2008
Volume 8, Issue 4 - Aug 2008
Volume 8, Issue 3 - Jun 2008
Volume 8, Issue 2 - Apr 2008
Volume 8, Issue 1 - Feb 2008
Selecting the target year
A Study on the Structural Optimization for Geodesic Dome
Lee, Sang-Jin ; Bae, Jung-Eun ;
Journal of the Korean Association for Spatial Structures, volume 8, issue 4, 2008, Pages 47~55
This paper deals with basic theories and some numerical results on structural optimization for geodesic dome. First of all, the space efficiency of geodesic dome is investigated by using the ratio of icosahedron's surface area to the internal volume enclosed by it. The procedure how to create the geodesic dome is also provided in systematic way and implemented and utilized into the design optimization code ISADO-OPT. The mathematical programming technique is introduced to find out the optimum pattern of member size of geodesic dome against a point load. In this study, total weight of structure is considered as the objective function to be minimized and the displacement occurred at loading point and member stresses of geodesic dome are used as the constraint functions. The finite difference method is used to calculate the design sensitivity of objective function with respect to design variables. The SLP, SQP and MFDM available in the optimizer DoT is used to search optimum member size patterns of geodesic dome. It is found to be that the optimum member size pattern can be efficiently obtained by using the proposed design optimization technique and numerical results can be used as benchmark test as a basic reference solution for design optimization of dome structures.
Characteristics and a Variation of Profile Shape in Scissors Deployable Structure
Choi, Eun-Mi ; Lee, Ju-Na ; Park, Chan-Soo ;
Journal of the Korean Association for Spatial Structures, volume 8, issue 4, 2008, Pages 57~64
In scissors deployable structure which could be easily removed by folding it, a method of curvature variation in the profile and the structural characteristics were examined. At first, the relation between the profile curvature and a eccentricity of joint in scissors members is presented by a formula and a graph. And then, the structural characters of scissors members with the curvature variation are presented by analysing a several models based on this relation. Also, a real modeling study is achieved in accordance with this composition method and the possibilities to be developed with the expected profile shape was examined.
A Study on the Constructability of Modular Steel Frame
Zheng, Sheng-Lin ; Kang, Joo-Won ; Park, Sung-Moo ;
Journal of the Korean Association for Spatial Structures, volume 8, issue 4, 2008, Pages 65~71
The object of this paper is to evaluate on constructability of modular steel frame with the hollow structural steel section to LEB C-shape. A modular building is built with factory-manufacture and site-construction. The advantage of a Modular building presents that enhanced building quality, shortened construction period and easy at an expansion and enlargement for buildings but also has demerits such as size restriction of the modular units according to the Road Traffic Law and Inflexibility of the unit composition. So in this study we use light-weighted structure members with bolted joint for easy Knock-down and traffic, also we evaluated the constructability of this bolted joints type modular buildings.
Optimization of Active Tendon Controlled Structures by Efficient Solution of LQR Control Gain
Cho, Chang-Geun ; Kyun, Jun-Myong ; Jung, In-Kju ; Park, Moon-Ho ;
Journal of the Korean Association for Spatial Structures, volume 8, issue 4, 2008, Pages 73~80
The objective of current study is to develop an optimization technique for the seismic actively controlled building structures using active tendon devices by an efficient solution of LQR control gain. In order to solve the active control system, the Ricatti closed-loop algorithm has been applied, and the state vector has been formulated by the transfer matrix and solved by a numerical technique of the trapezoidal rule. The time-delay problem has been also considered by phase compensation. To optimize the performance index, the ratio of the weighted matrix is the design variable, allowable story drift limits of IBC 2000 and tendon forces have been applied as restraint conditions, and the optimum control program has been developed with the algorithm of the SUMT technique. In examples of the optimization problem of eight stories shear buildings, it is evaluated that the optimum controlled building is more suitable in the control of earthquake response than the uncontrolled system and can reduce the performance index to compare with the controlled system with a constant ratio of the weighted matrix.
p-Adaptive Analysis by Three Dimensional Hierarchical Hexahedral Solid Element
Woo, Kwang-Sung ; Jo, Jun-Hyung ; Shin, Young-Sik ;
Journal of the Korean Association for Spatial Structures, volume 8, issue 4, 2008, Pages 81~90
This paper presents a finite element formulation for the three-dimensional hierarchical solid element using Integrals of Legendre polynomials. The proposed hexahedral solid element is composed of four different modes including vertex, edge, face, and internal mode, respectively. The eigenvalue and patch test have been carried out to confirm the zero-energy mode and constant strain condition. In addition to these, a posteriori error estimation has been studied for the p-adaptive finite element analysis that is based on a smoothing technique to compute a post-processed solution from the finite element solution. The uniform p-refinement and non-uniform p-refinement are compared in terms of convergence rate as the number of degree of freedom is increased. The simple cantilever beam is tested to show the performance of the proposed solid element.
Performance Evaluation of Vibration Control of High-rise Buildings Connected by Sky-Bridge
Kim, Hyun-Su ; Yang, Ah-Ram ; Lee, Dong-Guen ; Ahn, Sang-Kyung ; Oh, Jung-Keun ;
Journal of the Korean Association for Spatial Structures, volume 8, issue 4, 2008, Pages 91~100
In this study, the vibration control performance of high-rise building structures connected by a sky-bridge has been investigated. The philosophy of vibration control using sky-bridges is to allow structures with different dynamic characteristics to exert control forces upon one another through sky-bridges to reduce the overall responses of the system. The the high-rise building structure connected by sky-bridge with 49 and 42 stories was used in this study to investigate the displacement, acceleration, reaction of bearings and stress of sky-bridge by analytical methods. To this end, historical earthquakes, an artificial earthquake and wind force time histories obtained from wind tunnel tests were used. Based on the analytial results, the use of sky-bridge can be effective in reducing the structural responses of high-rise buildings against wind and seismic loads.