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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 12, Issue 4 - Dec 2012
Volume 12, Issue 3 - Sep 2012
Volume 12, Issue 2 - Jun 2012
Volume 12, Issue 1 - Mar 2012
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Interface Technique for Optimization of Free-form Structural System
Na, Yoo-Mi ; Lee, Jae-Hong ; Kang, Joo-Won ;
Journal of the Korean Association for Spatial Structures, volume 12, issue 1, 2012, Pages 43~50
DOI : 10.9712/KASS.2012.12.1.043
Recently, due to the advanced computer technology, momental architectures have been designed and built using features that are very sophisticated. People's interest in free-form structural system has increased steadily not only nationwide, but also worldwide. However, there were many difficulties in the materialization of free-form structural system owing to the lack of technique and research. To solve this problem, this study performs the interface between the 3D modeling program and the optimization program. In the 3D modeling program, it is possible to automatic mesh generation and immediately to information extraction. It performs the shape optimization. Consequently, this research designs the example model and performs optimization in order to verify the developed interface module.
Analysis Model of Extruded ECC Panel RC Composite Slabs
Cho, Chang-Geun ; Kim, Yun-Yong ; Seo, Jeong-Hwan ; Lee, Seung-Jung ;
Journal of the Korean Association for Spatial Structures, volume 12, issue 1, 2012, Pages 51~58
DOI : 10.9712/KASS.2012.12.1.051
A model for the nonlinear flexural analysis of extruded Engineered Cementitious Composite (ECC) panel reinforced concrete (RC) composite slab has been newly presented. From direct tensile test, ECC panel has been modeled to have the high-ductile tensile behavior after cracking. The developed model was compared with bending test results of two specimens, a conventional RC slab and a ECC panel RC composite slab. The predicted results were well patched with the experimental results, and the ECC panel RC composite slab system had advantages in crack control and improving flexural load-carrying capacity and deformation-capacity.
A Study on the Dynamic Instability Characteristics of Latticed Dome Under STEP Excitations
Kim, Seung-Deog ; Jang, Je-Pil ;
Journal of the Korean Association for Spatial Structures, volume 12, issue 1, 2012, Pages 59~68
DOI : 10.9712/KASS.2012.12.1.059
The space frame structure is one of the large span structural system consisting of longitudinal and latitudinal members. The members are connected in three dimension. A space frame structure has high stiffness with a structure resisting external forces in steric conformation. According to many structural conditions, structural stability problems in the space frame are determined and considered very important. This study seeks to understand the space frame collapse mechanism using the 2-free nodes truss model in order to examine static structural instability characteristics of the latticed dome. According to geometrical shape, the star dome, parallel lamella dome and three way grid dome were selected as models. The models were examined for characteristics of instability under STEP Excitations behavior according to rise-span ratio(
) and shape imperfection.
Comparative Analysis of Cable Dome Structures by Reinforcement Effect with Bracing and Fabric
Kim, Seung-Deog ; Sin, In-A ;
Journal of the Korean Association for Spatial Structures, volume 12, issue 1, 2012, Pages 69~75
DOI : 10.9712/KASS.2012.12.1.069
The purpose of this paper is to study comparative analysis of cable dome structures by reinforcement effect with bracing and fabric. Tensegrity systems are stable structures which are reticulated spatial structures composed of compressive straight members, struts, and cables. Tensegrity structures need to be introduced to the initial stress for the self-equilibrated system to have a stable state. In this paper, the effect of reinforcement resisting the in-plan twisting is investigated for the Geiger-type and Zetlin-type models reinforced by bracing and fabric. The effect of initial imperfection is also studied because the structural instabilitity phenomenon of shell-like structures is very sensitive according to the initial condition. We study a more exact analysis concerning the structural instability of tensegrity structures using nonlinear analysis program. Then, two types of tensegrity models will be analysed and compared.
Form-finding of Free-form Membrane Structure based on Geometrically Non-linear Analysis and Interface method
Kim, Jee-In ; Na, Yoo-Mi ; Kang, Joo-Won ; Lee, Jae-Hong ;
Journal of the Korean Association for Spatial Structures, volume 12, issue 1, 2012, Pages 77~85
DOI : 10.9712/KASS.2012.12.1.077
The membrane structure maintains stable form by giving initial tension to ductile membrane and increasing the stiffness of exterior that is much adopted in the large span spatial structure by making its thickness thin. This kind of membrane structure has characteristic that can express free-form curve, so the selection of structural form is very important. So, this paper proposes the expression of free-form surface based on NURBS basis function and the finite element method considering geometrical nonlinearity for the deduction of large deformation result. Also, for minimizing the approximation of the surface that is derived from the form-finding result, the interface method that change finite element mesh to NURBS is proposed. So, the optimum surface of free-form membrane is derived.
Finite Element Analysis of Gabled Hyperbolic Paraboloid Shells
Kim, Seung-Nam ; Yu, Eun-Jong ; Rha, Chang-Soon ;
Journal of the Korean Association for Spatial Structures, volume 12, issue 1, 2012, Pages 87~98
DOI : 10.9712/KASS.2012.12.1.087
In this study, mechanical role of edge beams in the gabled hyperbolic paraboloid shells was investigated through the comparisons of Finite element(FE) analysis results between the shells structures with and without edge beams. In addition, the effects of roof slope was studied. FE analysis showed that roof loads was directly transferred to the supports at corners by the arch action in the diagonal direction of the shells, thus, less member forces in the edge and ridge beams but higher stresses near supports were estimated than those from the membrane theory. When the edge beams were removed, stress concentration in the shells near the supports and the deflections along the shell edge were increased. Such phenomenon were intensified as the roof slope decrease. Thus, in gable hyperbolic paraboloid shell, the thickness of the shell near supports needs to be increased and careful investigation should be made in the cases when the roof height is low and/or the edge beams are removed.
Application of TMD for Seismic Response Control of Dome Structure
Kim, Gee-Cheol ; Kang, Joo-Won ;
Journal of the Korean Association for Spatial Structures, volume 12, issue 1, 2012, Pages 99~108
DOI : 10.9712/KASS.2012.12.1.099
Vibration control devices are classified into passive, semi-active and active device. TMD(Tuned Mass Damper) is one of the passive control device that is mainly used to reduce vibration level of building structure and bridge structure. In this study, the application of passive tuned mass damper(TMD) to seismic response control of dome structures has been investigated. Because star dome structure has primary characteristics of dome structures, star dome structure was used as an example dome structure that is subjected to horizontal or vertical seismic loads. From this numerical analysis, it is shown that seismic response are influenced by vibration modes 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.
A Study on Cutting Pattern Generation of Membrane Structures Using Spline Curves
Shon, Su-Deok ; Lee, Seung-Jae ;
Journal of the Korean Association for Spatial Structures, volume 12, issue 1, 2012, Pages 109~119
DOI : 10.9712/KASS.2012.12.1.109
For membrane structure, there are three main steps in design and construction, which are form finding, statistical load analysis, and cutting patterning. Unlike the first two stages, the step of cutting pattern involves the translation of a double-curved surface in 3D space into a 2D plane with minimal error. For economic reasons, the seam lines of generated cutting patterns rely greatly on the geodesic line. Generally, as searching regions of the seam line are plane elements in the step of shape analysis, the seam line is not a smooth curve, but an irregularly divided straight line. So, it is how we make an irregularly divided straight line a smooth curve that defines the quality of the pattern. Accordingly, in this paper, we analyzed interpolation schemes using spline, and apply these methods to cutting pattern generation on the curved surface. To generate the pattern, three types of spline functions were used, i.e., cubic spline function, B-spline, and least-square spline approximation, and simple model and the catenary-shaped membrane was adopted to examine the result of generation. The result of comparing the approximation curves by the number of elements and the number of extracted nodes of simple model revealed that the seam line for less number of extracted nodes with large number of elements were more efficient, and the least-square spline approximation provided smoother seam line than other methods.