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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 11, Issue 4 - Dec 2011
Volume 11, Issue 3 - Sep 2011
Volume 11, Issue 2 - Jun 2011
Volume 11, Issue 1 - Mar 2011
Selecting the target year
Terror Risk Analysis of High-rise Building by Rapid Visual Screening
Ji, Jung-Hwan ; Yoon, Sung-Won ;
Journal of the Korean Association for Spatial Structures, volume 11, issue 2, 2011, Pages 55~62
DOI : 10.9712/KASS.2011.11.2.055
While frequency of occurrence of terrorism has recently increased, it intensively occurs in buildings that many unspecified persons gather. Terrorism which occurs in high-rise buildings causes a lot of damage. It is necessary for design approach to reduce terrorism damage from explosive of buildings. Terror risk analysis of domestic tall and high-rise buildings is evaluated by fema 455, Rapid Visual Screening which is found to be comparatively simple and practicable. Common risk factors of terrorism in domestic buildings were investigated. The results of terror risk assessment of all buildings are found to be a medium risk score, Main reason is that domestic tall or high-rise buildings have similar external-environmental factors.
Analysis of the Wind Pressure Coefficient Characteristic of Livestock Shed Roof Surface according to the Opening of Side Walls
You, Ki-Pyo ;
Journal of the Korean Association for Spatial Structures, volume 11, issue 2, 2011, Pages 63~70
DOI : 10.9712/KASS.2011.11.2.063
Livestock buildings are rural facilities as vulnerable to natural disasters as vinyl houses. Many of livestock buildings have a roof but without side walls. The roof of such structures is easily blown away by a typhoon and this results in a heavy loss. Therefore, farmers install winch curtains on the sides to prevent damages caused by typhoons. This study purposed to examine the distribution of wind pressure coefficient among different positions of livestock shed roof according to the opening of side walls. It was found that according to the distribution of peak external pressure coefficient on the roof surface of livestock shed, the wind blowing at wind angle
was disadvantageous to roof surface regardless of the presence of side walls. However, it was confirmed that the peak external pressure coefficient was affected by wind angle and the length of eave depending on the presence of side walls.
Experimental study of Hydraulic Cable Connection Systems with Re-tensioning and Wireless Monitoring
Kim, Min-Su ; Lee, Ki-Hak ; Kim, Seong-Beom ; Lee, Sung-Min ; Baek, Ki-Youl ;
Journal of the Korean Association for Spatial Structures, volume 11, issue 2, 2011, Pages 71~79
DOI : 10.9712/KASS.2011.11.2.071
Due to the self-equilibrium status of the cable system, the loss of the tensioning in the cable system results in other cables carrying larger tension forces than those initially calculated by structural engineers. Also, turn-buckle systems, which have been widely used to pre-tension and/or re-tension the cables, are limited to use for small cables and to provide a rough estimation for tension forces. In this study, the re-tensioning cable connection systems were developed to overcome the problems mentioned above. The main objective of the proposed system is to re-tension large cables and measure the exact amount of tension forces of the cable systems. This connection system is also combined with the wireless signal monitoring module so that engineers are able to measure the tension forces any place where the internet is available. This paper presents the development of the re-tensioning cable connection systems and experiment using the real-scale cable systems to verify the fe-tensioning and signal monitoring systems.
Optimal Design of Passive TMD for Seismic Behavior Control of Spacial Structures
Kim, Gee-Cheol ; Kang, Joo-Won ;
Journal of the Korean Association for Spatial Structures, volume 11, issue 2, 2011, Pages 81~88
DOI : 10.9712/KASS.2011.11.2.081
The studies of seismic response control are mainly conducted on rahmen structure until now. Spatial structures have the different dynamic characteristics from general rahmen structures. So, the results of these studies are very limited for vibration control and seismic design of spatial structures. TMD(Tuned Mass Damper) is one of the vibration control device that is mainly used to reduce the vibration level of high-rised building, bridge or stadium structure. In this study, an arch structure was used as an example structure because it has primary characteristics of spatial structures and the seismic behaviour of spatial structures may fundamentally differ from the conventional building structures. So, the vibration control performance is evaluated according to the change of TMD mass and TMD location. It is reasonable to install TMD at the quarter point that is dominant mode vector of 1st mode, And it is appropriate that TMD mass ratio is 2% in the seismic response control of arch structure.
Multi-objective Fuzzy Control of a Spacial Structure using Smart Base Isolation System
Kang, Joo-Won ; Kim, Hyun-Su ; Lim, Jun-Ho ;
Journal of the Korean Association for Spatial Structures, volume 11, issue 2, 2011, Pages 89~99
DOI : 10.9712/KASS.2011.11.2.089
In this study, a smart base isolation system has been proposed to reduce dynamic responses of a spacial structure subjected to seismic excitation. MR dampers and low damping elastomeric bearings were used to compose a smart base isolation system and its vibration control performance has been investigated compared to that of the optimally designed lead-rubber bearing (LRB) isolation system. Control performance of smart base isolation system depends on control algorithm. Fuzzy controller was used in this study to effectively control the spacial structure having a smart base isolation system. Dynamic responses of the spacial structure with isolation system is conflict with base drifts and thus these two responses are selected as objective functions to apply multi-objective genetic algorithm to optimization of fuzzy controller. Based on numerical simulation results, it has been shown that the smart base isolation system proposed in this study can drastically reduce base drifts and seismic responses of the example spacial structure in comparison with the optimally designed LRB isolation system.
Hybrid Control Model of MR Damper for Seismic Response Control of Adjacent Buildings
Kim, Gee-Cheol ; Kang, Joo-Won ; Chae, Seoung-Hun ;
Journal of the Korean Association for Spatial Structures, volume 11, issue 2, 2011, Pages 101~110
DOI : 10.9712/KASS.2011.11.2.101
Many researchers have attempted to apply semi-active control systems in the civil engineering structures. Recently, magneto-rheological(MR) fluid dampers have been developed. This MR damper is one of semi-active dampers as a new class of smart dampers. This paper discusses the application of MR damper for seismic response control of adjacent buildings subjected to earthquake. Here, a controllable damping force of MR damper that is installed between adjacent buildings is applied to seismic response control. A hybrid model combines skyhook and groundhook control algorithm so that the benefits of each can be combined together. In this paper, hybrid control model are applied to the multi degree of freedom system representative of buildings in order to reduce seismic response of adjacent buildings. And the performance of hybrid control model is compared with that of others. It was demonstrated that hybrid control model or adjacent buildings with MR damper was effective for seismic response control of two adjacent buildings reciprocally.
The Buckling Characteristics of Single-Layer Lamella Domes according to the Joint Flexibility under Construction
Suk, Chang-Mok ; Kim, Cheol-Hwan ; Jung, Hwan-Mok ;
Journal of the Korean Association for Spatial Structures, volume 11, issue 2, 2011, Pages 111~118
DOI : 10.9712/KASS.2011.11.2.111
Single-layer latticed domes with rigid-joint have an advantage in the construction cost and the aesthetic. But, in single-layer latticed domes, the joints are hard to discriminate between pin-joint and rigid-joint, and consisted of semi-rigid joint in practical. And the erection of large roof structures requires special techniques. As one of these special techniques is the Step-Up erection method. This paper verified buckling characteristics of single-Layer lamella domes according to the Joint flexibility under construction by Step-up method. The results are follows: As erection steps increase, the buckling strength decreases. It is occurred the joint buckling by snap through on the top of dome when the joint flexibility close the rigid. And large tensile stress distribution appeared in circumferential member of bottom boundary when the step of construction is low. As the step of construction increase, large compressive stress distribution showed in the top of dome.
A Study on the Earthquake Response Characteristics of Steel Frames with Metallic Damper
Lee, Seung-Jae ; Park, Jae-Seong ; Oh, Sang-Hoon ;
Journal of the Korean Association for Spatial Structures, volume 11, issue 2, 2011, Pages 119~127
DOI : 10.9712/KASS.2011.11.2.119
The purpose of this study is to propose damper system which is easy to design, which can ensure against risks, and to verify earthquake response characteristics. For this study, the pseudo dynamic earthquake response tests carried out for steel frames with metallic damper. As a result, in case of using the metallic damper as a vibration control device proposed by this study, the damper having higher stiffness than main-structure turned to the state of plasticity by little displacement has been proved to be able to absorb earthquake energy.
Study on the Application of Semi-open cut Top-Down Construction for Framework
Sho, Kwang-Ho ;
Journal of the Korean Association for Spatial Structures, volume 11, issue 2, 2011, Pages 129~138
DOI : 10.9712/KASS.2011.11.2.129
Construction methods for underground structure are classified as bottom-up, up-up, and top-down methods depending on the procedure of construction related to a superstructure. In top-down construction methods, building`s main structure is built from the ground level downwards by sequentially alternating ground excavation and structure construction. In the mean time, the main structure is also used as supporting structure for earth-retaining wall, which results in the increased stability of the earth-retaining wall due to the minimized deformation in adjacent structures and surrounding grounds. In addition, the method makes it easy to secure a field for construction work in the downtown area by using each floor slabs as working spaces. However top-down construction method is often avoided since an excavation under the slab has low efficiency and difficult environment for work, and high cost compared with earth anchor method. This paper proposes a combined construction method where semi-open cut is selected as excavation work, slurry as earth -retaining wall and CWS as top-down construction method. In the case study targeted for an actual construction project, the proposed method is compared with existing top-down construction method in terms of economic feasibility, construction period and work efficiency. The proposed construction method results in increased work efficiency in the transportation of earth and sand, and steel frame erection, better quality management in PHD construction, and reduced construction period.
Displacement Control Technique of Pre-stressable Cable Structures by Force Method
Shon, Su-Deok ; Kwan, Alan S.K. ; Lee, Seung-Jae ;
Journal of the Korean Association for Spatial Structures, volume 11, issue 2, 2011, Pages 139~149
DOI : 10.9712/KASS.2011.11.2.139
A cable structures have the advantage that cover a large space without column but it is very sensitive to deal with shape control because of its flexibility. Especially, location of control member and needed elongation of member are important things. Therefore, the purpose of this paper is studied on displacement control technique for pre-stressed cable structures by force method considering order of control. The layout of this paper is as follows. Firstly, in section 2, the control technique by force method for cable structures is given. Secondly, section 3 briefly introduces simple cable net in order to apply control technique considering ordering of actuator. Finally, more complex example for effective member and the conclusion are in section 4 and 5, respectively.