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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Architectural Institute of Korea Structure & Construction
Journal Basic Information
Journal DOI :
Architectural Institute of Korea
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Volume & Issues
Volume 30, Issue 12 - Dec 2014
Volume 30, Issue 11 - Nov 2014
Volume 30, Issue 10 - Oct 2014
Volume 30, Issue 9 - Sep 2014
Volume 30, Issue 8 - Aug 2014
Volume 30, Issue 7 - Jul 2014
Volume 30, Issue 6 - Jun 2014
Volume 30, Issue 5 - May 2014
Volume 30, Issue 4 - Apr 2014
Volume 30, Issue 3 - Mar 2014
Volume 30, Issue 2 - Feb 2014
Volume 30, Issue 1 - Jan 2014
Selecting the target year
New Form-Finding Method combined Genetic Algorithms and Force Density Method
Yoon, Byoung-Wook ; Lee, Jae-Hong ; Kang, Joo-Won ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 8, 2014, Pages 3~8
DOI : 10.5659/JAIK_SC.2014.30.8.3
Tensegrity structures are pre-stressed pin-joint structures inclusive tensile members and compressive members. Form-finding is very important for Tensegrity structures need to determine shape and pre-stress value for self-equilibrium. In the form-finding of tensegrity structures, Infomation are usually introduced for initial geometry and pre-determined member types. In this study, Form-finding of tensegrity structures by using genetic easy and versatile form-finding processing requires only a minimal information 'topology'. Genetic Algorithms was determined the type of members. The form-finding of tensegrity structures are found by a full iteration pocedure until a state of self-stress is obtained.
Slip Test of Pipe Connector for Greenhouse Frame
Lee, Swoo-Heon ; Shin, Kyung-Jae ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 8, 2014, Pages 9~17
DOI : 10.5659/JAIK_SC.2014.30.8.9
The heavy snowfall in wintertime due to abnormal climate often led to collapse of the plastic greenhouse. A main mechanical reason for the greenhouse collapse is the insufficient moment resistance of a steel pipe used as rafter. As an additional potential reason for collapse, it may be that the strength of connection can affect the global behavior of the greenhouse. It is because the out-of-plane resistance of slender greenhouse frame can become weak when the hookup between pipes is unstable or the strength of connector is below standard strength. In the experimental program, this study evaluates slip load of connector practically used in farmland between rafer (vertical member) and purlin (horizontal member). To investigate the slip load or clamping force of four-types of pipe connectors, the loading tests were carried out with a loading jig designed. As test results, the slip loads or clamping forces of most of the pipe connectors available in the market were not up to standards intimated from Rural Development Administration.
The Development of Impact Force Model of Large Commercial Aircraft Considering the Fuel Mass Effect
Lee, Kyoung-Soo ; Huque, Ziau ; Jeon, Doo-Jin ; Han, Sang-Eul ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 8, 2014, Pages 19~28
DOI : 10.5659/JAIK_SC.2014.30.8.19
In this paper, the aircraft impact force models of large commercial B747 aircraft were developed by using so called Missile-Target Interaction Method. The Lagrangian meshfree SPH concept was adopted to the fuel mass for impact force calculation. 240ton, 320ton, 420ton of aircraft mass were considered to meet with the previously proposed aircraft impact force model by OECE/NEA(2002) and Arros & Doumbalski(2007). The model of present studies are based on the model of OECE/NEA originally, and extended to the model of Arros & Doumbalski. To calculate and evaluate the aircraft impact force, the impact analyses were simulated by using commercial Hydrocde AUTODYN considering the fuel mass effect. The resultant reaction force of symmetric rigid wall is considered as the impact force of aircraft. The preparation of refined FE mesh and impact simulation were done by using AUTODYN. The aircraft and fuel debris and secondary trajectory effects were considered by the eroding effect on the FE shell element and the explicitly modeled fuel mass. To evaluate and verify the impact force of aircraft, the Riera approach were used for the reference impact time history graph. The rigid wall impact test shows that the finite element model of a B747 which considering the explicit fuel mass effect is good agreement with reference values and the applicability of fuel modelling approaches of this study.
Aerodynamic Damping Ratio of Super-tall Buildings
Kim, Yong-Chul ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 8, 2014, Pages 29~36
DOI : 10.5659/JAIK_SC.2014.30.8.29
Aerodynamic damping ratios play an important role in the estimations of wind-induced responses of modern super-tall and slender buildings and structures. In the present study, along- and across-wind aerodynamic damping ratios of a square cross-sectional conventional and tapered super-tall buildings with height of 448m were investigated using the Random Decrement Technique (RDT) for the responses obtained from the aeroelastic wind tunnel tests. Wind tunnel tests were conducted under the urban flow condition. Effects of building shape, normalized velocity and wind direction on aerodynamic damping ratios were comprehensively discussed. It was found that the along-wind aeroelastic aerodynamic damping ratios show similar linear increasing trends on the normalized velocities at small wind directions regardless of building shapes. But the across-wind aerodynamic damping ratios show clear differences depending on building shapes, showing different peaks and different normalized velocities at which peaks of aerodynamic damping ratios occur and positive aerodynamic damping ratios become negative. Lastly the effect of trigging value in RDT on aerodynamic damping ratios was examined by changing it from one standard deviation to three times of standard deviation. By enlarging the trigging value, the differences in aerodynamic damping ratios increase, implying the optimal trigging values may exist between one standard deviation and
times of standard deviations in the current experimental conditions.
Effect of Crack Width and Waterproof Membrane Coatings on the Chloride Ion Penetration of Mortar Substrate
Miyauchi, Hiroyuki ; Koo, Kyung-Mo ; Lee, Jun ; Yoon, Min-Ho ; Miyauchi, Kaori ; Kim, Gyu-Yong ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 8, 2014, Pages 37~44
DOI : 10.5659/JAIK_SC.2014.30.8.37
The purpose of this study was to evaluate the salt damage resistance of waterproofing membrane in order to protect the mortar or concrete substrate. Polyurethane and acrylic coating membrane were used, and the salt water immersion test and the chloride ion concentration test were carried out experimentally. Also, the salt damage in mortar was analyzed by comparing with the permeability of each specimens. Waterproofing membrane have a high salt damage resistance more than only non-coated substrate, and prevented the penetration of chloride ion from non-crack to 0.3mm-crack specimens in 13 weeks-accelerating test. Finally, the membrane thickness for suppressing salt damage was estimated from viewpoint of its permeability.
Methodology for Estimating Stochastic CO
Emission for Construction Operation
Yi, Chang-Yong ; Gwak, Han-Seong ; Lee, Dong-Eun ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 8, 2014, Pages 45~54
DOI : 10.5659/JAIK_SC.2014.30.8.45
Reducing greenhouse gas(GHG) emissions is a worldwide concern. Low carbon construction is an important operation management goal. Construction resources(i.e., equipment and laborer) are major contributors to producing GHG, and they are the main target for achieving low carbon construction. The amount of Carbon emissions varies depending on the operating conditions. This paper introduces a method which measures the variability of carbon emissions amounts. First, it allows creating construction operation models of which the level of detail is breakdown into the work task level. It makes use of the equipments' hourly fuel consumption and laborers' hourly respiration rate. Second, the method implements sensitivity analysis along with ranges of resources that are allocated in an operation model. It facilitates to find the optimal resource combination using the operation performances such as the amount of emissions, operation completion time, operation completion cost, and productivity. Third, it identifies the best fit probability distribution functions of performance criteria given a certain resource combination. It allows project manager to query the chance to complete the operation within limitations of multiple performance criteria specified by the system users.
Qualitative Risk Factor Analysis of Overseas LNG Plant in Operation and Management Phases
Ji, Deak-Keun ; Park, Moon-Sun ; Kim, Yong-Su ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 8, 2014, Pages 55~62
DOI : 10.5659/JAIK_SC.2014.30.8.55
The purpose of this study is to analyze qualitative risk factors that are considered in operation and management phases of overseas LNG plant. For this purpose, the study investigated risk factors of similar projects. Based on these results, risk factors of overseas LNG plant are derived and qualitative risk factors are classified from interview with experts. Qualitative risk factors that have been classified, are analyzed priority and relative importance by using AHP method. The results of this study according to purpose and method are as follows: 1)Forty-two risk factors, from 125 risk factors of similar projects being investigated, on LNG plant operation and management phases were derived. Risk factors were separated by transportation, sales, maintenance and management, and then 20 qualitative risk factors were derived by survey of experts. The results of relative importance analysis by using AHP method based on qualitative risk factors are as follows: Relative importance of "LNG production which does not meet quality contract(M-12)" was analyzed as the most highly risky factor. "Cancel a license contract of core technology(M-07)", "Insufficient review of local relevant laws(M-08)", "Occurred defects of equipment due to insufficient design(R-08)" have been analyzed in order of importance.
Barriers of CM Performance during Construction Stage in Public CM Projects
Kim, Min-Ji ; Kim, Han-Soo ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 8, 2014, Pages 63~70
DOI : 10.5659/JAIK_SC.2014.30.8.63
The sustainable growth of Construction Management(CM) market depends on clients' acceptance from positive project outcomes of CM services. Achieving the positive outcomes requires CM firms' competency and efforts as well as regulatory environments. Equally, it is critical to understand and overcome barriers of CM performance, which cause inefficiencies and under-performance of CM services. The objective of the study is to identify and discuss the barriers of CM performance during construction stage in public CM projects based on the FMEA technique. Major findings basically suggest that the proper level of CM fee and flexibility in CM regulations is the core to improve CM performance during construction stage in public CM projects.
A Status Analysis on the Operation of Field Organization in Construction Management Companies
Shin, Won-Sang ; Lee, Kang-Min ; Son, Chang-Baek ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 8, 2014, Pages 71~78
DOI : 10.5659/JAIK_SC.2014.30.8.71
This study is aimed at offering basic data for enhancing the organizational structure and productivity of on-site construction management (CM) employees. To accomplish the objective, the organizational operation system and employee evaluation of domestic CM companies were analyzed by site scale to promote efficient operation. The findings are as follows. First, in terms of CM workforce, the employees handling architecture, electricity, and machines represented the highest proportion. As for qualification, top engineers were dispatched to both large-scale and small-scale CM sites more than any other employee. Second, the results on CM organizational productivity are as follows. The per capita sales increased as the service payment increased. In terms of scale, the site worth less than a billion won had per capita sales of 76 million won, about 5 times less than the site worth 5 billion won or more whose per capita sales were 371 million won. The monthly per capita sales also increased as the service payment increased. However, the difference was minimal, about a half of the difference in per capita sales. These findings would be useful for companies that have no systematic criteria for CM organization selection and evaluation.
An Status Analysis on the BIM Utilization and Its Improvement Measures in Domestic Architects
Kim, Min-Jae ; Lee, Kang-Hup ; Son, Chang-Baek ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 8, 2014, Pages 79~86
DOI : 10.5659/JAIK_SC.2014.30.8.79
The present study investigates current status of BIM application, primary tasks utilizing BIM and relevant problems in domestic construction industry to analyze relative importance of problems associated with BIM application in domestic architectural design practices and make suggestions for betterment. Ultimately, this study aims to present practical reference data conducive to a stable and broad adoption of BIM among domestic architectural design offices in near future. The findings are as follows. First, a majority of domestic architectural design offices employ BIM at the request of clients and acknowledge the need for BIM whilst their satisfaction with BIM application is below par overall. Second, problems related to applying BIM in domestic architectural design offices largely involve economic feasibility and specialized manpower. Finally, this study proposes some measures to vitalize BIM application in domestic architectural design offices from the perspective of economic feasibility, specialized manpower, applicability, collaborative system and software based on a general consensus among experts.
A Root Cause Analysis of Problems in the Use of Environmental Information for Construction Projects: Focusing on Environmental Laws and Regulations
Kim, Da-Woom ; Woo, Sang-June ; Lee, Jae-Wook ; Kim, Han-Soo ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 8, 2014, Pages 87~95
DOI : 10.5659/JAIK_SC.2014.30.8.87
The collection and analysis of environmental information, such as environmental laws, regulations, and certification criteria, has become a very important task for construction projects. However, in the current practice, many problems have caused due to massive amounts of information, low information accessibility, and insufficient definition of business processes. Therefore, this study aims to figure out problems in the use of environmental information for the design phase and construction phase of construction projects based on a business process analysis. The result of the study is expected to be used as a basis for improving environment-related business processes of construction projects.