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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 15, Issue 4 - Dec 2015
Volume 15, Issue 3 - Sep 2015
Volume 15, Issue 2 - Jun 2015
Volume 15, Issue 1 - Mar 2015
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A Study on the Shape Modeling and Structural Stability of an Icosahedron-typed Modular Dome
Shon, Su-Deok ; Woo, Hyo-Jun ; Lee, Seung-Jae ;
Journal of the Korean Association for Spatial Structures, volume 15, issue 2, 2015, Pages 51~59
DOI : 10.9712/KASS.2015.15.2.051
In this study, a shape design and an analysis considering structural stability were investigated to develop an icosahedron-based hemispherical modular dome. To design this modular dome, a program that can perform icosahedron shape modeling, modularization of joint connection members, and the analysis of structural stability was developed. Furthermore, based on the adopted numerical model, the eigen buckling mode, unstable behavior characteristics according to load vector, and the critical buckling load of the modular dome under uniformly distributed load and concentrated load were analyzed, and the resistance capacities of the structure according to different load vectors were compared. The analysis results for the modular dome suggest that the developed program can perform joint modeling for shape design as well as modular member design, and adequately expressed the nonlinear behaviors of structured according to load conditions. The critical buckling load results also correctly reflected the characteristics of the load conditions. The uniformly distributed load was more advantageous to the structural stability than concentrated load.
Structural Performance Evaluation of VES Damper System subjected to Cyclic Loadings(CST30)
Kim, DaeHun ; Lee, DongKyu ; Lee, Kihak ;
Journal of the Korean Association for Spatial Structures, volume 15, issue 2, 2015, Pages 61~68
DOI : 10.9712/KASS.2015.15.2.061
The performance enhancement of various structural building systems from natural hazards has become an inctreasingly important issue in engineering field. In this paper, visco-elastic(VE) CST30 damping systems were tested under cyclic loadings to evaluate their performance in terms of ductility and energy dissipation. Main test variables are relative shear stiffness, rate of loading frequency, and thickness of specimens to evaluate the seismic capacity based on the performance criteria. This experiment was performed using a total of 12 specimens, subjected to cyclic loadings up to a shear deformation of 500%. All the CST30 dampers provided a ductile and stable hysterestic behavior when subjected to the demands of large shear stiffness and different loading frequencies. The test results showed that the CST30 dampers are an effective damping systems to enhance the buildings performance for remodeling and retrofit of buildings.
Shear Transfer Strength Evaluation for Ultra-High Performance Fiber Reinforced Concrete
Lee, Ji-Hyung ; Hong, Sung-Gul ;
Journal of the Korean Association for Spatial Structures, volume 15, issue 2, 2015, Pages 69~77
DOI : 10.9712/KASS.2015.15.2.069
Ultra High Performance Fiber Reinforced Concrete (UHPFRC) has a outstanding tensile hardening behaviour after a crack develops, which gives ductility to structures. Existing shear strength model for fiber reinforced concrete is entirely based on crack opening behavior(mode I) which comes from flexural-shear failure, not considering shear-slip behavior(mode II). To find out the mode I and mode II behavior on a crack in UHPFRC simultaneously, maximum shear strength of cracked UHPFRC is investigated from twenty-four push-off test results. The shear stress on a crack is derived as variable of initial crack width and fiber volume ratio. Test results show that shear slippage is proportional to crack opening, which leads to relationship between shear transfer strength and crack width. Based on the test results a hypothesis is proposed for the physical mechanics of shear transfer in UHPFRC by tensile hardening behavior in stead of aggregate interlocking in reinforced concrete. Shear transfer strength based on tensile hardening behavior in UHPFRC is suggested and this suggestion was verified by comparing direct tensile test results and push-off test results.
Dynamic Performance of Pedestrian Guardrail System based on 3-D Soil Material Model according to Post Shapes
Yang, Seung-Ho ; Lee, Dong-Woo ; Shin, Young-Shik ;
Journal of the Korean Association for Spatial Structures, volume 15, issue 2, 2015, Pages 79~86
DOI : 10.9712/KASS.2015.15.2.079
This study investigated the embedded depth of guardrail posts through 3-D soil material model and carried out evaluation of the dynamic performance of guard rail. In order to calculate for embedded depth of sloping ground, displacement of guardrail posts is analyzed according to the embedded depth of experiment variables. Through the static test of guardrail posts, the maximum deflection was found to decrease the interval. By performing the dynamic test using the Bogie Car, that is confirmed the elastic modulus of the soil occuring the maximum deflection. Guardrail posts is considered to need for further reinforcement in the larger slope than the plains. This study researched about maximum displacement and deviation velocity through dynamic performance of guardrail system and conducted analysis about protection performance evaluation of passenger.
An Arrangement Technique for Fine Regular Triangle Grid of Network Dome by Using Harmony Search Algorithm
Shon, Su-Deok ; Jo, Hye-Won ; Lee, Seung-Jae ;
Journal of the Korean Association for Spatial Structures, volume 15, issue 2, 2015, Pages 87~94
DOI : 10.9712/KASS.2015.15.2.087
This paper aimed at modeling a fine triangular grid for network dome by using Harmony Search (HS) algorithm. For this purpose, an optimization process to find a fine regular triangular mesh on the curved surface was proposed and the analysis program was developed. An objective function was consist of areas and edge`s length of each triangular and its standard deviations, and design variables were subject to the upper and lower boundary which was calculated on the nodal connectivity. Triangular network dome model, which was initially consist of randomly irregular triangular mesh, was selected for the target example and the numerical result was analyzed in accordance with the HS parameters. From the analysis results of adopted model, the fitness function has been converged and the optimized triangular grid could be obtained from the initially distorted network dome example.
Estimation of Punching Shear Strength for Ultra High Performance Concrete Thin Slab
Park, Ji-Hyun ; Hong, Sung-gul ;
Journal of the Korean Association for Spatial Structures, volume 15, issue 2, 2015, Pages 95~103
DOI : 10.9712/KASS.2015.15.2.095
UHPC(Ultra High Performance Concrete) is used widely with its remarkable performance, such as strength, ductility and durability. Since the fibers in the UHPC can control the tensile crack, the punching shear capacity of UHPC is higher than that of the conventional concrete. In this paper, seven slabs with different thickness and fiber volume ratio were tested. The ultimate punching shear strength was increased with the fiber volume ratio up to 1%. The shear capacity of specimens with the fiber content 1% and 1.5% do not have big differences. The thicker slab has higher punching shear strength and lower deformation capacity. The critical sections of punching shear failure were similar regardless of the fiber volume ratio, but it were larger in thicker slab.
Development of Multi-Input Multi-Output Control Algorithm for Adaptive Smart Shared TMD
Kim, Hyun-Su ; Kang, Joo-Won ;
Journal of the Korean Association for Spatial Structures, volume 15, issue 2, 2015, Pages 105~112
DOI : 10.9712/KASS.2015.15.2.105
A shared tuned mass damper (STMD) was proposed in previous research for reduction of dynamic responses of the adjacent buildings subjected to earthquake loads. A single STMD can provide similar control performance in comparison with two traditional TMDs. In previous research, a passive damper was used to connect the STMD with adjacent buildings. In this study, a smart magnetorheological (MR) damper was used instead of a passive damper to compose an adaptive smart STMD (ASTMD). Control performance of the ASTMD was investigated by numerical analyses. For this purpose, two 8-story buildings were used as example structures. Multi-input multi-output (MIMO) fuzzy logic controller (FLC) was used to control the command voltages sent to two MR dampers. The MIMO FLC was optimized by a multi-objective genetic algorithm. Numerical analyses showed that the ASTMD can effectively control dynamic responses of adjacent buildings subjected to earthquake excitations in comparison with a passive STMD.
Dynamic Response Property according to Natural Frequency Ratio between Dome Structure and Substructure
Lee, Young-Rak ; Kim, Kwang-Il ; Kang, Joo-Won ;
Journal of the Korean Association for Spatial Structures, volume 15, issue 2, 2015, Pages 113~120
DOI : 10.9712/KASS.2015.15.2.113
This study investigate the dynamic response changes of rib dome structure according to property changes of Substructure. Eigenvalue analysis is conducted in first natural frequency of rib dome versus substructure and searched in the dominant mode of horizontal and vertical direction. Resonance frequency by each first natural frequency of the rib dome structure, substructure and total structure is applied for a seismic wave. That is analyzed about maximum displacement response ratio and maximum acceleration response ratio.