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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 29, Issue 12 - Dec 2013
Volume 29, Issue 11 - Nov 2013
Volume 29, Issue 10 - Oct 2013
Volume 29, Issue 9 - Sep 2013
Volume 29, Issue 8 - Aug 2013
Volume 29, Issue 7 - Jul 2013
Volume 29, Issue 6 - Jun 2013
Volume 29, Issue 5 - May 2013
Volume 29, Issue 4 - Apr 2013
Volume 29, Issue 3 - Mar 2013
Volume 29, Issue 2 - Feb 2013
Volume 29, Issue 1 - Jan 2013
Selecting the target year
Shear Strength Evaluation of Steel Fiber-Reinforced Concrete Flexural Members Using ANFIS
Cho, Hae-Chang ; Lee, Deuck-Hang ; Hwang, Jin-Ha ; Ju, Hyun-Jin ; Kim, Kang-Su ; Seo, Soo-Yeon ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 3~11
Steel fiber-reinforced concrete(SFRC) members has improved shear strength compared to typical reinforced concrete members as the steel fibers mixed into concrete improve the tensile performance of concrete. Due to the very complicated shear transfer mechanisms of SFRC members, however, researchers has mostly proposed semi-empirical equations for estimation of shear strength of SFRC members based on test results. In this study, Adaptive Nuero-Fuzzy Inference System(ANFIS) was adopted to evaluate shear strengths of SFRC flexural members. It is known that the ANFIS, which is a knowledge-based model, can provide very accurate analysis results when the reliable and sufficient data are utilized. A total of 172 test data were collected from literature, and used for development of ANFIS shear strength model for SFRC beams, which provided very accurate evaluation of the shear strength of SFRC members.
Evaluation of Shear Strength of Concrete Beams Reinforced with FRP Plates
Choi, Jong-Hoon ; Kim, Min-Sook ; Kim, Hee-Cheul ; Lee, Young-Hak ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 13~20
A FRP shear reinforcement is proposed for the design of reinforced concrete beams. The FRP shear reinforcement is manufactured into a plate shape and has several openings on it for its perfect integration with concrete. It is embedded into concrete with main steel reinforcement during construction stage. In this paper, the performance of this proposed shear reinforcement is investigated by performing a structural test on six concrete beam specimens with shear span to depth ratio of 2.4. Test parameters include the type and shape of FRP shear reinforcement. The effects of these parameters on the shear strength of the FRP reinforced concrete beam are examined. A shear strength equation for concrete beams with the proposed FRP shear reinforcement is suggested by a proper modification of the existing shear strength equation for concrete beams with steel stirrups in ACI 318-11. The comparison between the test results and the estimation by the proposed equation generally shows a good agreement between them.
Work Efficiency Analysis of BIM Based Structural Drawing
Lee, Jae-Cheol ; Jung, Jong-Hyun ; Oh, Hyang-Ok ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 21~28
BIM supports the many useful functions to develop the AEC industries, such as quantity takeoff and cost estimating, clash detection, schedule simulation, etc. However, the most important factor to determine the practical usefulness is the connectivity for traditional way. In this paper, we analyzed the work efficiency of BIM based structural drawing in terms of drawing workability, graphic expressivity, clash detection and working hours in comparison with those of 2D based structural drawing. And we proposed the division of works between BIM based and 2D based structural drawing for efficient work in field. For this, we investigated the real project as a test bed, that is, 20-floor ground and 1-floor underground scale wall-type apartment comprised of 4-plan type, 5-household. As a results, we found out the difference of expression in case of centerline and wall, and BIM based work requires more working time than 2D based work because it spends time to retouch BIM generated drawing into traditional form and generate initial BIM model itself. To activate BIM in field, it is needed to improve the traditional working environment of structural drawing forms and establish a BIM based drawing standard soon.
Push-down Analysis of Seismic Designed 5-Story RC MRF for Progressive Collapse Resisting Capacity
Kang, Suk-Bong ; Oh, Jun-Ho ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 29~37
In this study, the effects of inelastic beam-column joint, MRF(moment-resisting frame) system and seismic design category on the progressive collapse resisting capability of structures are evaluated via push-down analysis for elimination of column following the procedure of GSA2003, where RC OMRF, IMRF and SMRF structures were designed in accordance with KBC2009. The bending moment-curvature relationship for beams and columns was identified with a fiber model, and the bending moment-rotation relationship for beam-column joints was calculated using a simple and unified joint shear behavior model and the moment equilibrium relationship for the joint. The results of the pushover analysis showed that framed structure designed with greater seismic load was evaluated to have higher progressive collapse resisting capability, and that excellent ductility capacity of RC SMRF structure caused higher progressive collapse resisting capability, and that the best progressive collapse resisting capability of structure was estimated in case of elimination of corner column.
Experimental Study on Torsional Performance of Steel Fiber-Reinforced Concrete Beams
Ju, Hyun-Jin ; Lee, Deuck-Hang ; Hwang, Jin-Ha ; Kim, Kang-Su ; Oh, Young-Hun ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 39~47
It is known that steel fiber-reinforced concrete (SFRC) members have enhanced torsional performances, compared to typical reinforced concrete members, but, our understanding on torsional behavior of SFRC members are yet very limited due to insufficient research on this topic. Thus, this study performed torsional tests on SFRC members, in which radial strain gradients developed in thin-walled concrete tube were measured in detail. The shortcomings of current design codes on the torsional strength of heavily reinforced members in transverse direction have been also discussed. Test results showed that the SFRC specimens having larger volume fraction of steel fibers had greater torsional strength and more ductile behavior as well. The compressive strains in the extreme fiber of SFRC members were estimated at about 0.0035 to 0.0040 at ultimate state. All specimens had the initial cracking angle of about 45 degrees, while the inclined angles at ultimate became somewhat smaller. The current code provisions overestimated the torsional strengths of all specimens that were over-reinforced against torsion.
A Experimental Study on Structural Behaviors of Single Shear Bolted Connections with Thin-Walled Aluminum Alloys(6061-T6)
Kim, Tae-Soo ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 49~56
The purpose of this experimental study is to investigate the structural behaviors such as fracture mode and ultimate strength of single shear bolted connections with aluminum alloys (6061-T6). Specimens were fabricated with 3mm thick plane plate and two types of bolt arrangements(
). Main variables are end distance parallel to the direction of load and edge distance perpendicular to the direction of load. As a result, the specimens failed by tensile fracture in the net section of plate or block shear fracture. Curling was observed in connections with a relatively long end distance and it caused the strength drop of bolted connections. Moreover, the ultimate strength and failure mechanism of test results were compared with those of current design standards such as AISI, AA and JASA. The curling led to the ultimate strength reduction of bolted connection with aluminum alloys and therefore current design standards tended to overestimate the ultimate strength.
Performance Experiment and Evaluation of Octagon Snow Fall Wind Fence for Meteorological Measurement
You, Ki-Pyo ; Nam, Byung-Hee ; Lee, Chun-Woo ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 57~64
Meteorological Observatory installs measuring boards on the even ground of open space to measure the amount of snowfall. However it is very difficult to evaluate the accurate amount of snowfall because of the influence of wind. In order to measure snow fall, it was tried to identify the inside airflow of octagon wind fence which was not influenced by wind. We performed computing fluid dynamics, wind tunnel test and field measurement of width and types of octagon wind break fence to analyze airflow inside of the fence. According to the result, dual fence was better than mono fence in wind speed reduction such as more than 50%. The fence whose wind fence wings were fixed on the surface showed better results than the fence detaching the wings from the surface. The reduction of the wind speed was the highest in the middle of the dual wind fence with 4m width. In wind tunnel test results, the fence attached to the surface with 4m width showed better wind speed reduction at the center of the inside than the fence with 6m width. In the actual measurement, 4m fence showed the best effects in wind speed reduction.
Determination of the Fire Protection Thickness of CFT Column Using Heat Transfer Analysis
Hwang, Kyu-Jae ; Yoon, Sung-Kee ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 65~72
The purpose of this research is to establish the fire protection thickness of concrete-filled columns(CFT) by finite element results using ABAQUS package program. This paper presents the results of a parametric study using transient heat transfer analysis, and compare these results with the existing results to check the accuracy of the proposed parametric studies. As a result of this study, regarding fire resistance performance depending on variation of thickness in fire protection, in case of non fire protection regardless of shape of steel tube, its rising temperature had shown greatly, compared with fire resistance criteria and its role as a fire resistance structure was not satisfied.
The Study on the Deduction of Finishing Area Approximate Estimating Equation for Finishing Material Takeoff by Apartment Houses Element
Roh, Seung-Jun ; Tae, Sung-Ho ; Kim, Tae-Hyoung ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 73~80
The purpose of this study is deduction of finishing area approximate estimating equation by apartment houses element for the finishing material takeoff and application according to the performance requirements by building. For this purpose, Understand building materials of approximate estimating methods and deduct the problem of approximate estimating by limited the range of study to the apartment houses and analyze a needed component and process of finishing material design and investigate research status. then select a finishing material using bill of quantity and architecture drawing of apartment building and suggest finishing area approximate estimating equation by apartment houses element for prediction cost estimation or environmental load assessment. furthermore perform deviant-case analysis for decision the possibility of application about suggested finishing area approximate estimating equation. as a result, in case make a comparison between quantity from bill of quantity and quantity from finishing area approximate estimating equation, survey figure show 10.08% measuring efficiency in common use space and 8.15% measuring efficiency in residental space. in addition, analyze result sorted by finishing material, show 6.75% measuring efficiency.
An Experimental Study on the Mixing of Normal Strength and High Fluidity Concrete Using Ground Granulated Blast Furnace Slag
Jang, Hyun-O ; Jee, Nam-Yong ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 81~88
High fluidity concrete is the concrete that has a high level of fluidity without the separation of materials while it is not hardened and has the self-compacting property without the extra work for compaction. In order to expand the usability of such high fluidity concrete for general usage, the formulation of an economical binder through the recycling of resources and reasonable mixing conditions for normal strength and high fluidity concrete are required. Therefore, this study formulated concrete binders at Level Six using ground granulated blast furnace slag for W/B 0.45 and 0.55, and then, performed a fluidity securing experiment according to the addition rates of a air entraining and high-range waterreducing agent. Accordingly, for the mixes in which the separation of materials occurred, the fluidity securing experiment was run after adding a viscosity agent in the concrete, which was 0.05% of the amount of the powder. According to these results, the optimal mixing ratios regarding the mixing of normal strength and high fluidity concrete using ground granulated blast furnace slag were BFS 15% and a air entraining and high-range waterreducing agent 1.25% for W/B 0.45, and were BFS 30% and a air entraining and high-range waterreducing agent 0.75% for W/B 0.55.
Relationship Between the Default Risk of a Construction Company and Unsold Housing Stock
Choi, Jae-Kyu ; Yoo, Seung-Kyu ; Kim, Jae-Jun ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 89~96
The U.S. subprime mortgage crisis of 2008 has led to a sharp increase in the number of unsold homes in our country. This has not only caused huge national and social expenditures, but has also made it challenging to manage construction companies given the slow progress of new projects and rise in debt and financial expenses. The default risk of construction companies results in economic losses to the interested parties as well as a huge burden on national finances, since it is linked to the default risk of financial institutions. Accordingly, the purpose of this study is to analyze the relationship between the Expected Default Frequency and the unsold housing stock using the KMV(Kealhofer, McQuown and Vasicek) model, based on the assumption that there is a close relationship between unsold housing stacks and default risk of construction companies. This study has utilized the KMV model based on the option pricing theory for deriving the Expected Default Frequency of an individual construction company. The Vector Error Correction Model was used for analyzing the relationship with unsold housing stock. For calculating the Expected Default Frequency, 26 listed construction companies from 2001-2010 were selected. The results are as follows. 1) It was found that the default risk of construction companies is primarily affected by the unsold housing stock that piled up due to the housing market situation. 2) The impulse response analysis confirmed that the default risk of construction companies is primarily affected by the creation of unsold housing stock, rather than due to housing price shocks.
Empirical Analysis on the Characteristics of Overseas Construction Business by Regions
Lee, Sang-Hoon ; Lee, Sang-Hyo ; Kim, Jae-Jun ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 97~104
Recently, domestic construction market has been depressed due to poor housing market and declining volume of public project, while overseas market continues to grow. Construction market is steadily expanding in Middle East and Asian region, and yet, domestic construction firms have been relying heavily on the Middle East for business opportunities. This study examines a relationship between changing domestic and overseas construction market environment and the volume of overseas construction projects in Middle East and Asia, in order to examine changes in business portfolio. The analysis period is between January 1991 and December 2010, based on monthly time-series data, using VECM (Vector Error Correction Model). The analysis results suggested that while domestic and Middle East construction markets may substitute each other, domestic and Asian construction markets were more conformed. On the surface, it seems high oil price has brought many business opportunities for domestic companies in the Middle East, but in fact, the domestic market is more adversely affected by high oil price. That is, domestic construction companies are taking projects in the Middle East to mitigate short-term financial hardships, rather than with a long-term business strategy and vision.
Study on Top-Down Method Applied with the Independence of Slurry Wall and Berm
Park, Sang-Joon ; Sho, Kwang-Ho ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 105~112
Top-down method is a type of downward construction method that slab, girders and beams are connected to slurry wall by sequentially alternating ground excavation and structure construction after the construction of cast-in-place pile. Top-down method was introduced in Korea in the middle of 1980s. Since early 2000s, about 20 top-down methods have been developed. However, the selection of top-down method adequate to apply at construction site is difficult because almost developed top-down methods excepting reinforced concrete top-down method have been patented. Also, top-down method is often avoided due to high cost, poor work conditions and low work efficiency compared with open-cut method and bottom-up method. This paper proposes a top-down method applied with the independence of slurry wall and berm. 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 and work efficiency. The proposed construction method results in better quality management in PRD work, steel frame work and excavation, increased economic feasibility and reduced construction period.
Optimization Methodology of Modular Unit Factory Production Process Using DSM
Kim, Tae-Yoon ; Park, Moon-Seo ; Lee, Hyun-Soo ; Suh, Sang-Wook ; Lee, Jeoung-Hoon ; Kim, Soo-Young ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 113~122
A modular system uses a construction method which the structure is manufactured in factories and assembled on site. In particular, conducting most of manufacturing process at the factory makes it possible to obtain consistent quality of the materials and finish the project within constrained time. Moreover, high factory production rate leads to a decrease of field production rate; and the decrease in field working hours would drive down the task difficulty which is affected by bad external environmental factors. Hence, optimized factory production system is essential to maximize these advantages of system and smooth production flow by repetitive production of modular units. This paper aims to suggest optimized construction process in a factory production stage using the DSM (Dependency Structure Matrix) which can consider construction information flow among activities. For this, it is necessary to identify modular as-is process and activities, and attempt to derive optimization of modular unit process. Then, to validate effectiveness of this study, this methodology was applied to the real modular factory. As the result, it reduced about 50% of information transfer compared to original. Also, with one way direction of construction flow, it reduced the possibility of production delay and rework. Thus, this paper is expected to produce activity information flow smoothly in a factory production stage and reduce rework.
Labor Productivity and Indirect Cost Rates of Steel Factory
Huh, Young-Ki ; Kim, Kyoung-Uk ; Kim, Kyung-Won ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 123~131
Steel works, in a typical building project, consist of more than 20% of total construction cost, which makes it essential to estimate the appropriate level of steel works cost precisely. In order to draw direct labor productivity and indirect cost rates, theories of productivity and indirect cost were investigated, and recent field data were collected from steel factories. As a result, it was revealed that direct labor productivity of steel fabrication and welding were 1.00(person.day/ton), 0.35(person.day/ton), respectively. It was also found that the ratio of indirect labor productivity compared to the direct labor ratio was approximately 17% and the ratio of indirect cost compared to direct cost was approximately 93%. In addition, influence factor having an effect on indirect cost of the steel factories were analyzed using ANOVA. It was confirmed that 'the way of subcontracting steel works' and 'location of steel factory' had influence statistically on the indirect cost. The results will help industry professionals estimating labor productivity and indirect cost of a steel factory, as well as a construction project.
Analysis of Japanese Construction Market Trends and Construction Companies' Strategies
Jang, Hyoun-Seung ; Sohn, Tae-Hong ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 29, issue 6, 2013, Pages 133~140
The main purpose of this study is to suggest key corporate strategies that can be applied by Korean construction companies by analyzing major Japanese construction companies in the unfavorable market environment. In addition to the main objective, this study aims to see if there is any possibility that Korean construction market could face long-term recession that Japan has been experiencing over the past 20 years by analyzing the long-term trend of Japanese construction market. Four corporate strategies utilized by major Japanese construction companies are: 1)improvement of market share; 2)expansion of value chain; 3)diversification of house-related business; 4)expansion of overseas construction market advance. The findings of this study can be used as useful materials in order to identify effective strategies of Korean construction companies that need to find a way for sustainable growth in the future.