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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 5, Issue 4 - Dec 2005
Volume 5, Issue 3 - Sep 2005
Volume 5, Issue 2 - Jun 2005
Volume 5, Issue 1 - Mar 2005
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A Study on the Optimum Thickness Distributions of Plate Structures with Different Essential Boundary Conditions
Lee, Sang-Jin ; Kim, Ha-Ryong ;
Journal of the Korean Association for Spatial Structures, volume 5, issue 4, 2005, Pages 53~59
This paper provides the results of the investigation on the optimum thickness distribution of plate structures with different essential boundary conditions. In this study, the strain energy to be minimized is considered as the objective function and the initial volume of structures is used as the constraint function. The computer-aided geometric design (CAGD) such as Coon's patch representation is used to represent the thickness distribution of plates. A reliable degenerated shell finite element is adopted to calculate the accurate strain energy level of the plates. Robust optimization algorithms provided in the optimizer DOT are adopted to search the optimum thickness values during the optimization iteration. Finally, the square plate is used to find out the optimum thickness distribution of plates according to different essential boundary condition.
Optimum Design of Greenhouse Structures Using Continuous and Discrete Optimum Algorithms
Park, Choon-Wook ; Lee, Jong-Won ; Lee, Hyun-Woo ; Lee, Suk-Gun ;
Journal of the Korean Association for Spatial Structures, volume 5, issue 4, 2005, Pages 61~70
In paper the discrete optimum design program was developed using the continuous and discrete optimum algorithms based on the SUMT and genetic algorithms. In this paper, the objective function is the weight of structures and the constraints are limits state design limits method. The design variables are diameter and thick of steel pipe. Design examples are given to show the applicability of the optimum design using the continuous and discrete optimum algorithms based on the SUMT and genetic algorithms of this study.
An Experimental Study on the Strengthening Effect of RC Beams Strengthened by CFRP
Kim, Jae-Hun ; Park, Sung-Moo ; Kang, Joo-Won ;
Journal of the Korean Association for Spatial Structures, volume 5, issue 4, 2005, Pages 71~77
Bonded CFRP Plate method used murk in reinforcement method is very efficient for stress increment of reinforced members. But CFRP plate dosen't display enough its capacity and have the destruction characteristic of premature failure that reach failure by debond plate, because near-surface-bond using epoxy. Such destruction character of reinforced specimens take the influence at variables as steel reinforcement ratio, concrete strength, kind of reinforcement materials, reinforced length, property of epoxy used in binder and so on. In this study, performed experiment results are compared and considered on flexural performance of Near Surface Mounted Reinforcement used CFRP-Rod, as complement about structural behavior of RC beam reinforced flexural capacity in CFRP plate and premature failure of reinforcement material. Main variables of RC beam applied CFRP Plate external bond method are experimental variables as reinforcement length, reinforcement position (tension face and side face of beam) and existence of ironware in end parts. In case of CFRP-Rod, variable is reinforcement length.
Analysis Method for Cable-Membrane Structures with Element Slipping
Kang, Joo-Won ; Kim, Jae-Yeol ;
Journal of the Korean Association for Spatial Structures, volume 5, issue 4, 2005, Pages 79~90
The purpose of this study is development of a finite element algorithm to find out the stressed condition, slipped direction and slipped dimension when some elements of cable-membrane structures are slipped from it's initially designed coordinates by external loads as wind or non uniform load and so on. In order to search the slipped behaviors of cable-membrane structures, a Arbitrarily-Lagrangian-Eulerian(ALE) finite element formulation is introduced. In these procedures, a stiffness matrix related with ALE concept is formulated and a FE analysis program for cable-membrane structures with slipped elements is developed. Various examples for cable and membrane structures are presented to verify the program's validation. The results are shown good agreement with that of existed one.
A Efficient Vibration Analysis Method for the Cooncrete-Steel Deck Slab
Kim, Gee-Cheol ;
Journal of the Korean Association for Spatial Structures, volume 5, issue 4, 2005, Pages 91~100
Composite slab structures consisted with steel deck plate and concrete material show generally anisotropic structural behavior because of different stiffness between the major direction and sub-direction of deck plate, and also the structures can be regarded as the laminated slab structures. It is necessary for the composite deck slab structures to carry out the exact vibration analysis to evaluate the serviceability. Also, it is needed to evaluate the exact structural behavior of composite deck slab with a layered orthotropic materials. In this paper, the thickness of topping concrete and deck plate are used to calculate the material coefficient stiffness of a sub-direction, and an equivalent depth calculated from sectional stiffness of concrete and deck plate is applied to get the stiffness of a major direction. The stiffness of two layered composite plates with different depth is determined by laminated theory. It is concluded that the presented method can efficiently analyze the structural behavior of composite deck slab consisted with steel deck plate and concrete material in the practical engineering field.
The Evaluation in Displacement Response of Tapered Tall Buildings to Wind Load
Cho, Ji-Eun ; You, Ki-Pyo ; Kim, Jong-Soo ; Kim, Young-Moon ;
Journal of the Korean Association for Spatial Structures, volume 5, issue 4, 2005, Pages 101~108
The investigations for mitigating wind-induced excitations of tall buildings have been carried out. The aerodynamic modification of a building shape changing the cross-section with height through tapering, which alters the flow pattern around the building, could reduce wind induced excitations of tall buildings. The fart that a tapered tall building might spread the vortex-shedding over a broad range of frequencies makes more effective for reducing acrosswind responses has been established. In this paper, to investigate the tapering effect for reducing wind-induced responses of a tapered tall building, high-frequency force-balance test was conducted. The six types of building models which have different taper ratio of 2.5%, 5%, 7.5%, 10%, 15% and one basic building model of a square cross-section were tested under the two typical boundary layers representing suburban and urban flow environment. The effect of wind direction was also considered.