Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Architectural Institute of Korea Structure & Construction
Journal Basic Information
Journal DOI :
Architectural Institute of Korea
Editor in Chief :
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
Experimental Study on the Flexural Strengthening Effect of Recycled Coarse Aggregate RC Beams Strengthened with Carbon Fiber Reinforced Polymers
Kim, Woo-Suk ; Park, Hee-Man ; Kim, Bong-Pil ; Baek, Seung-Min ; Kwak, Yoon-Keun ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 3~12
DOI : 10.5659/JAIK_SC.2014.30.7.3
Recycled coarse aggregates (RCAs) made by construction waste can be used as concrete aggregates. Nevertheless, some studies have indicated that increasing the RCA replacement ratios of the reinforced concrete (RC) structures resulted in a decrease in failure load capacity, in strength degradation, and in severe cracking. In this study, the use of carbon fiber reinforcement polymer (CFRP) sheets and CFRP plates in RC structures was evaluated for their effect in suppressing cracking and in adding strength to the structure. Twelve specimens including five control beams were fabricated, using various recycled coarse aggregate substitution rates, to compare and analyze the CFRP material's reinforcement effects. All specimens were fabricated with stirrups as simple beams with fixed span to effective depth ratio of 3.88 to 1 (i.e., a/d=3.88). The main variables studied in this investigation are (1) replacement level of recycled coarse aggregates (0, 15, 30 and 50%), (2) tensile reinforcement ratio (0.8, 1.27%), and (3) the incorporation of CFRP sheets and/or CFRP plates.
Structural Performance of Steel Fiber Reinforced Concrete Slab with the Steel Deck-Plate
Hong, Geon-Ho ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 13~20
DOI : 10.5659/JAIK_SC.2014.30.7.13
Slab is one of the most influential members in whole structure because the number of members are increased in proportion to the number of stories. So the structural type of slab can largely influence on the whole construction period and amount of materials. This study suggest the slab system consist of structural deck-plate and steel fiber reinforced concrete for improving construction ability and reduction of construction period. Structural deck-plate can replace the tensile reinforcement and concrete form, and steel fiber can replace the temperature reinforcement. Total 5 slab specimens were tested for analyzing the structural performance and serviceability. This paper analyzed the test data in the viewpoints of flexural strength, stiffness, deflection, crack and failure pattern. Test results indicated that slab with structural deck-plate has good flexural strength ratio and greatly increase the flexural stiffness compared with normal concrete slab. And it can also reduce the cracking height, and represent the good dispersion of it. The performance of slab with steel fiber reinforced concrete and deck-plate is appeared to be similar or better to the slab with wire-mesh and deck-plate.
Aerodynamic force evaluation of Pointed Tip Wind Turbine Blade Using CFD
Lee, Kyoung-Soo ; Huque, Ziaul ; Han, Sang-Eul ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 21~28
DOI : 10.5659/JAIK_SC.2014.30.7.21
This paper presents the pointed tip effects on the aerodynamic load of The National Renewable Energy Laboratory (NREL) Phase VI wind blade rotor. The aerodynamic loads around flow field are evaluated using 3D CFD simulation. The commercial ANSYS CFX and parameterized 3D cad models of NREL Phase VI are used for the analyses. The Shear Stress Transport (SST) turbulence model and 0-degree yaw angle condition are adopted for CFD analysis. Nonlinear twist angles were adopted for the effects of nonlinear resultant wind speed. The linearly tapered shape was made by reducing the chord length linearly to the tip region. To find out the 3D aerodynamic effects, sectional pressure coefficient and integrated forces about primary axis, which are normal, tangent, thrust and torque, are evaluated. 7 wind speed cases (5m/s, 7m/s, 10m/s, 13m/s, 15m/s, 20m/s, 25m/s) with constant blade rotating speed (72 RPM) are considered. The pointed tip shape was made by reducing the original NREL chord length gradually near the tip region. The numerical difference of Cp on wind blade surface between original and modified pointed tip models is negligible except near tip region, and also shown good agreement with experimental result in low wind speed case. From the CFD simulation for pointed tip shape, the decreased value of surface integrated torque about primary axis are obtained because of the reduced surface area in pointed tip region, but it is negligible compared to total values. Rather it can help to increase the structural stability and reduce the vortex because of the reduced force coefficient on near the tip region.
An Estimation on the Stiffness Matrix of Three Dimensional Solid-Flat Shell Transition Element
Jung, Sung-Jin ; Lee, Min-Sub ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 29~37
DOI : 10.5659/JAIK_SC.2014.30.7.29
A structural model consists of many types of finite elements, such as truss, beam, plate, shell and solid element, and so on. With the aid of commercial computer programs, field engineers comfortably use these finite elements at the same time for the modelling and analysis of real structure in their new projects. However, it is still difficult to model the connections and interfaces between different types of finite elements because of mutually ill-matched node numbers and degrees of freedom(d.o.f). To settle these problems, Many researchers studied and proposed various solution methods in literatures on FEA(Finite Element Analysis) and the use of transition elements is considered as one of the solutions. This pater presents an isoparametric formulation for three dimensional transition finite element, especially the solid-flat shell transition element. The proposed solid-flat shell transition element is composed of the solid element with 8 nodes, 3 d.o.f and the flat shell element with 4 nodes, 6 d.o.f for the simple formula derivation and the usefulness of practical applications. Basic theories for solid element and flat shell element are studied at first and a possible method for realizing the solid-flat shell transition element is suggested. On the basis of these theoretical backgrounds, the formula which calculates the stiffness matrix of the solid-flat shell transition element is derived in detail and an algorithm available for computer programming is investigated lastly.
Temperature Characteristics of Form and Rebar Depending on the Existence of Shading Feature Under the Sunlight in a Hot Weather Condition
Han, Cheon-Goo ; Kim, Kyoung-Hoon ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 39~46
DOI : 10.5659/JAIK_SC.2014.30.7.39
This study investigated the temperature characteristics of mold type and rebar diameter depending on the existence of shading under the sunlight in a hot weather condition in Korea. The molds were made out of euroform wood, gang form iron, al form aluminum, and rebars were four kinds of D13, D19, D25, and D32. They were measured using thermocouple thermometers in real outdoors condition, from August 3, 2012, until August 5, 2012, for three days. Results showed that gang form mold was the hottest at
, followed by aluminum and wooden molds. Their temperatures reached peak ar around 14:00. As for the rebars, in the aluminum molds highly susceptible to heat reflecion, D32 peaked at
, and this peak temperature was followed by when in gang form and wooden molds. Because rebars with thicker diameter store more heat, their temperatures peaked later when the atmosphere temperature peaked. As for the shading materials that prevent temperature from rising due to sunlight, SBS, which is modified conventional bubble sheet surface into aluminum deposition layer, was the most capable of keeping the temperature lower than that of the atmosphere. This was followed by tent made of blue sheet, WBS using which pigment, and curtain in black in terms of effectiveness.
A Experimental Study on Property of Matters of Traditional Starch Lime as Eco-Friendly Plaster Material
Park, Cheul-Woo ; Lim, Nam-Gi ; Lee, Kweon-Yeong ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 47~54
DOI : 10.5659/JAIK_SC.2014.30.7.47
The study aims at securing basic data for developing Starch lime, one of traditional construction material from the era of Chosun Dynasty, as eco-friendly plaster material, which is applicable to contemporary buildings, by mixing Starch lime and checking its property of matters. The results of experiments after historical research and selection of mix ratio are as follows: For viscosity and softness of dough before hardening after initial mix, it was excellent without workability affected by both mixing method of Yeonggeon-euigwe and field mixture. For setting time, mixing of Yeonggeon-euigwe seems to be very inferior for the contemporary construction process. And in the quantity per unit mixture only, it cannot expect moisture-proofness and waterproofness. Therefore if a construction is done according to the quantity per unit mixture, there will be a plenty of problems. For increasing adhesive hardness of Starch lime as adhesive material for laying traditional bricks and reducing its cracks after hardening, referring to the method according to field mixture seems to secure higher quality. Therefore, in order to develop eco-friendly material for the contemporary buildings, it requires new mixture method through reflecting Yeonggeon-euigwe and field mixture.
Endurance Characteristics of High Early Strength and Low Heat Concrete using Mineral High Early Strength Type Binder
Kim, Kyoung-Min ; Son, Ho-Jung ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 55~62
DOI : 10.5659/JAIK_SC.2014.30.7.55
This study analyzes basic and endurance characteristics of mass concrete mixed with mineral binder and the result can be summarized as follow: For unhardened concrete slump, all cases are satisfied with the target range, however the high early strength and low heat case has little bit decreased tendency rather than other cases. And the air content also be satisfied with all cases within target range. For the compressive strength per material age as the characteristics of hardened concrete, Low heat-B mix shows the lowest compressive strength, and the other mixes show similar strength range, but in the initial material age, high early strength mix shows higher strength than low heat-A and low heat-B mix. For the drying shrinkage length change ratio, Low heat and low heat-B show the highest value as
, and high early strength and low heat mix shows the lowest value as
. In the carbonation depth of penetration according to change of mineral binder, the material age of 26 weeks shows the higher tendency regardless of mix as 15.4 mm~17.3 mm. For the endurance factor according to freeze-thaw cycle, all cases show the good result as higher than 85 % regardless of mineral binder. All cases show acceptable chloride of diffusion coefficient caused by increase of watertightness from hydration product of binder, and the high early strength and low heat mix shows the better result than the other binder mixes as
Characteristics of Restrained Drying Shrinkage Cracking of Amorphous Steel Fiber-Reinforced Concrete
Kim, Seon-Du ; Choi, Kyoung-Kyu ; Choi, Se-Jin ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 63~70
DOI : 10.5659/JAIK_SC.2014.30.7.63
In this study, free and restraint drying shrinkage tests of conventional and amorphous steel fiber-reinforced concrete were performed to investigate the shrinkage characteristics. To consider the effect of restraint condition of concrete on shrinkage cracking, three different test setups were used: ring type restraint test according to ASTM C 1581-04, dumbbell type restraint test according to KS F 2595, and modified dumbbell type restraint test with notches. Crack widths and strain profiles acquired from the tests were compared and investigated. The test results showed that the addition of amorphous steel fibers with 0.2-0.4% volume fraction into concrete resulted in 30% reduction of free drying shrinkage, 3-5 days delay of crack development time, and 20-60% reduction of crack width. Thus, it can be concluded that the amorphous steel fibers can be used for the purpose of crack control of concrete shrinkage cracking.
The Properties of Extruding Panel using Ground Granulated Blast Furnace Slag and Calcium-Aluminate Based Mixture
Choi, Duck-Jin ; Kim, Jin-Man ; Choi, Se-Jin ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 71~79
DOI : 10.5659/JAIK_SC.2014.30.7.71
Due to the development of steel industry, more than 12 million tons of ground granulated blast-furnace slag(GG) have produced every year. On the other hand, the amount of GG got used has been discreasing gradually due to the construction market diminished. So it is needed to develop some various usage for GG including increasing the amount of GG in concrete and concrete products. Even if the extruded panel mainly used for the external drywall having superior performance to being needed, it has not been widely utilized in the drywall market for an interior material, due to its low economic advantage. This study have checked the engineering characteristics of various extruded panels, depending on the different amounts of blast furnace slag(GG), CA binder and hemihydrate gypsum(HG), and finally determined the optimum mixture ratio of an environmentally friendly non-OPC extruded panel, with high economic and environmental feasibility. The experimental results of this study confirmed that the amount of CA could replace up to at least 10wt% of the total binder in the non-OPC extruded panel with GG in the comprehensive consideration of its strength and moldability. Then, the optimum blending ratio of alpha-hemihydrate gypsum(HG) was 20wt% of CA.
Drawing Management Prototype System using Automatic Extracting Information based on Metadata Library
Park, Hyung-Jin ; Koo, Kyo-Jin ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 81~88
DOI : 10.5659/JAIK_SC.2014.30.7.81
Construction drawings are communicative language with owner, designer, contractor and also contract documents meaning quantitative and visual description of project. These are valuable as construction knowledge during construction process. Many of design company manage drawings using special drawing management systems because of drawings are made up image based. But, In upload process for drawings, they need effort for input information by designer, that is significant pressure to work. This research uses text information on drawing to efficient upload and search of construction drawings. We develop algorithm for automatically extract text on drawings using metadata library, and drawing management prototype system. Designer can efficient upload drawings to system automatically using drawing management prototype system without extra work.
An Analysis of the Market Structure Change in Construction Management Industry - Based on Public Announcement Data of CM Capabilities, 2004~2012 -
Choi, Ji-Hye ; Lee, Yoon-Sun ; Kim, Jae-Jun ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 89~96
DOI : 10.5659/JAIK_SC.2014.30.7.89
The modern construction industry in Korea is poised to introduce innovative project management methods, such as CM (construction management)-at-Risk, and to establish an institutional base that will facilitate a switch to a high-value knowledge-based industry. Thus, it is necessary to provide guidelines for business expansion, including entry into related domestic and foreign markets. The principal aim of this paper is to make an evaluation and to analyze the issues concerning the market structure of CM industry. The public announcement data of CM capability during the years 2004-2012, are collected to compute comparable measures of market concentration. As, the market concentration is most used as a proxy index of competition, this paper applied concentration ratio (
) method, E, RE, HHI and Gini Coefficient to analyze the concentration indices for CM industry market with 2004 to 2012 statistical data. Analysis of the indices indicates that CM industry has not been concentrated. The results of this study would assist the managers to design better competitive strategies they have to compete.
Development of An Approximate Estimate System for Exterior Finishing Works of Super High-rise Buildings
Yeom, Dong-Jun ; Kim, Young-Suk ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 97~104
DOI : 10.5659/JAIK_SC.2014.30.7.97
The demand of super high-rise building construction projects has recently been increasing in Korea and overseas. Estimating the budget for such projects is much more difficult than that for typical high-rise buildings. Super high-rise building construction projects generally involve more complicated structure for each floor and more various design conditions for interior and exterior finishes given a facility composition ratio. Consequently, it encompasses numerous design condition changes from the initial design development phase. This results in the difficulty in the prediction of appropriate construction budget due to frequent changes of design conditions and customer demands. The purpose of this research is to suggest an approximate estimation process and system that assists the construction engineers in decision making on-site, focusing on the exterior finish work that accounts for fifteen percent of the overall construction cost of super high-rise buildings. It is expected that the proposed approximate estimation process and system contributes to the decision making of the construction engineers by examining and comparing the appropriateness of the construction costs for each proposed design alternative as well as making it easier the estimation of the increase of decrease in the construction cost (cost over-runs) due to the changes of customer demands and design conditions from the initial design phase. Additionally, the finding of this study, i.e. the proposed approximate estimation system for the cost of exterior finish work of super high-rise buildings, is hoped to enhance the understanding of the details of the estimation process and provide more reliable estimation results faster than the traditional method.
Development of Enforcement Rate for Occupational Safety and Health Management Expense by Construction Project Types and the Percentage of Completion
Choi, Seung-Ho ; Oh, Se-Wook ; Kim, Young-Suk ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 30, issue 7, 2014, Pages 105~114
DOI : 10.5659/JAIK_SC.2014.30.7.105
The Standard of Occupational Safety and Health Management Expense(Safety Management Expense) statute of the Ministry of Employment and Labor has been stated in order to prevent industrial accidents in construction sites. Based on what the owner must estimate Safety Management Expense considering the type of project. Safety Management Expense is defined as the money used during the construction project to prevent industrial accidents in advance. Numerous revisions are made by the Ministry of Employment and Labor for the more effective usage. However, it has been analyzed that numerous over budgeting and early burnout cases occur due to the existence of limited standards to minimum usage only. Therefore, the purpose of this research is to analyze the previous studies on the Safety Management Expense allocation, deducting the problems of Safety Management Expense allocation and suggesting the allocated indicators of Safety Management Expense by rate of process and Construction type. It is expected that this research contributes to the effective use of Safety Management Expense in construction sites, which is necessary to reflect the actual conditions of the current construction industry environment.