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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 31, Issue 12 - Dec 2015
Volume 31, Issue 11 - Nov 2015
Volume 31, Issue 10 - Oct 2015
Volume 31, Issue 9 - Sep 2015
Volume 31, Issue 8 - Aug 2015
Volume 31, Issue 7 - Jul 2015
Volume 31, Issue 6 - Jun 2015
Volume 31, Issue 5 - May 2015
Volume 31, Issue 4 - Apr 2015
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Geometrically Nonlinear Analysis of Plates and Shells with Reissner-Mindlin Isogeometric Degenerated Shell Element
Park, Kyoung-Sub ; Lee, Sang-Jin ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 3~10
DOI : 10.5659/JAIK_SC.2015.31.7.3
In this study, geometrically nonlinear analysis of plate and shell structures is carried out by using a degenerated shell element. The present shell element is formulated by using the isogeometric concept. Reissner-Mindlin assumption is adopted in the element formulation where total Lagrange formulation is used. In particular, the positions of control points is consistently used to create the normal vector for the mapping between control points and associated points on real surface. The arc-length method is employed to handle the snap-through behaviour of shells. Several benchmark tests are tackled to verify the performance of the present shell element. From numerical tests, the present shell element can remove locking phenomena with the only use of refinement technique and it performs satisfactorily for both thin and thick plate and shell structures under geometrically nonlinear situations.
A Study on the Mechanical Properties of Concrete Using Recycled Coarse Aggregates at High Temperatures
Shin, Woo-Cheol ; Lee, Ho-Kyung ; Baek, Seung-Min ; Kim, Woo-Suk ; Kwon, Woo-Hyun ; Kwak, Yoon-Keun ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 11~18
DOI : 10.5659/JAIK_SC.2015.31.7.11
The main purpose of this study is to investigate on residual mechanical performance of recycled coarse aggregate concrete (RCAC), after being subjected to high temperatures. In this experiment, a control concrete mix made with natural coarse aggregates and two concrete mixes with RCA replacement ratio of 15% and 30% were designed. Specimens were exposed for a period of
to temperatures of
. After cooling down to ambient temperature, the following basic mechanical properties were then evaluated and compared with reference values obtained prior to thermal exposure: (i) Residual compressive strength; (ii) Residual splitting tensile strength; (iii) Residual flexural strength; (iv) Elastic modulus; (v) SEM analysis & XRD analysis. In addition, XRD and SEM Images analyses were performed to investigate chemical and physical characteristics of RCAC.
A Study on Non-working Day Calculation Standards and Days of Non-working for Estimation of Optimum Duration in the Excavation and Foundation Work
Bang, Jong-Dae ; Song, Sang-Hoon ; Cho, Gun-Hee ; Sohn, Jeong-Rak ; Kim, Jin-Won ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 19~26
DOI : 10.5659/JAIK_SC.2015.31.7.19
Non-working day in the construction work is closely related with the construction duration and one of the most important factors in the process planning. Although most construction companies in domestic can accurately calculate working days, these companies are difficult to calculate exactly days of non-working because the calculation standard of non-working day is insufficient. Although previous studies have suggested the calculation standard of non-working day due to weather conditions, these studies didn't provide a standard to determine whether the next day is working day or non-working day when it had much rain and snow. In this study, we proposed the new calculation standards of non-working day and days of non-working of 30 cities about the excavation and foundation works. The results of this study will be useful to estimate the proper construction duration for 30 cities. Also, these will be utilized to find start time for the profiTable construction duration in the same project of the same area. Finally, The results of this study will be helped to save construction cost and improve quality of apartment housing.
Drying Shrinkage Crack Analysis of Concrete Using Optimized Prony Series
Kim, Han-Soo ; Yoo, Hyun-Suk ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 27~34
DOI : 10.5659/JAIK_SC.2015.31.7.27
If the concrete members are restrained, drying shrinkage strain develops tensile stress and consequently develops cracks. Creep which is another long term characteristic of concrete relaxes the tensile stress due to shrinkage. Creep is represented in the form of creep function or relaxation function and the relaxation effect of creep can be considered by numerical integration. Creep function or relaxation function depend on two time variables representing creep effect and aging effect, respectively. In general purpose finite element program like Abaqus, Prony series are used in creep analysis to evade the complexity of numerical integration of creep function. However, Prony series in Abaqus has critical deficiency that it can represent only creep effect excluding aging effect. In this paper, optimized Prony series was proposed to complement the weakness of Prony series in Abaqus. The optimized Prony series can include not only creep effect but also aging effect. Drying shrinkage crack analysis was performed using XFEM features in Abaqus to demonstrate the efficiency of the optimized Prony series. Analysis model representing the drying shrinkage crack test specimen specified in KS F 2595 was used to compare with the shrinkage crack development measured in experiment. Analysis results with the optimized Prony series were quite similar to the experiment results and show the effectiveness of the proposed method in long term analysis of concrete structures.
Experimental Study on Flexural Capacity of I-slab System using Slim Precast Slab Deck
Kim, Seung-Hun ; Lee, Han-Seung ; Choi, Hyun-Ki ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 35~42
DOI : 10.5659/JAIK_SC.2015.31.7.35
Recently, the interest in precast voided slab system for buildings is growing up according to the demand for high quality control and the increase in slab thickness. A hollow slab system is widely known as one of the effective slab system which can reduce self-weight of slab. However, in case of conventional precast voided slabs, It is uncertain to apply these slab system to two-way slabs because It have a rectangular shaped void-former. In this study, I-slab system that applies plate type and octagonal pillar type void-former on slim precast slab deck is developed, and then flexural capacity of the I-slab system Is evaluated by 4-pointed banding test. In addition, flexural capacities of I-slab system along the longitudinal and transverse axis are compared to verify the applicability of I-slab system to two-way slabs. Test results showed that I-slab had enough flexural strength and ductility for slab member. In addition, I-slab system Is found to be sufficiently possible to apply on two-way slabs.
Net Pressure Coefficients for Wind Resistant Design of Ginseng Facilities
Kim, Byung-Jo ; Kim, Hyo-Jung ; Ha, Young-Cheol ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 43~50
DOI : 10.5659/JAIK_SC.2015.31.7.43
Wind pressures acting on the ginseng facilities are changed by the installation types of ginseng facilities and the opening conditions of shading nets of side wall. Wind tunnel tests for various model simplified installation types and conditions of opening of side wall were conducted and wind pressure distributions of various ginseng facilities were investigated. However, these results should not be used to estimate wind load for general ginseng facilities, because these results have been reflected various characteristics, such as installation types, the conditions of opening and wind direction. Therefore, for estimating wind load of ginseng facilities in proper, it is necessary to simplify wind pressure coefficient distribution for roof and wall of shading nets. In this study, wind pressure data needed to simplify wind pressure coefficient for roof and wall of shading nets of ginseng facilities should be selected, and the zoning of wind pressure coefficients for roof and wall of ginseng facilities shall be proposed.
Characteristic of the Environment-Friendly Mortar Using the Adsorbent Reducing the Radon gas
O, Seo-Myeong ; Yoo, Yong-Jin ; Lee, Sang-Soo ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 51~58
DOI : 10.5659/JAIK_SC.2015.31.7.51
The radon is the element of the radioactive series as the environmental pollutant existing everywhere with the nature and living space. In case of the radon more than the medical standard was drunk with the gaseous substance naturally generated in the space in which the person lives or breathing by causing the respiratory disease, including the fatal lung cancer, it is known. As to the Radon gas, is reported and that great deal of radon is mainly emitted to the room from the soil, subsurface water, and construction material particularly the what is relatively high thing including the granite gypsum board, yellow soil, and etc. is generated. In addition, it showed that concentration of the Radon gas was high in the house built with the concrete and the concentration which is higher in the house in which the mortar is used as the outer wall finish was detected and the construction material choice became the important factor reducing the Radon gas generation. By applying the adsorbent in which the adsorption performance and purification performance is excellent to the moat tar, this research tries to study the application plan of the environment-friendly mortar in order to reduce the problem including the inner climate polution, harmful material and Radon gas exhaustion, and etc.
Effect of Mineralogical Sources of Coarse Aggregate on the Engineering Properties of Ultra High Strength Concrete with 80 MPa
Han, Min-Cheol ; Jung, Sang-Woon ; Lee, Hong-Kyu ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 59~66
DOI : 10.5659/JAIK_SC.2015.31.7.59
The objective of this paper was to investigate experimentally the effect of aggregate kinds on the engineering properties of the ultra high strength concrete with 80 MPa. Granite stone(GA), low purity lime stone(RLA) and high siliceous lime stone(HSRLA) and basalt stone(BA) were used to make ultra high strength concrete incorporating silica fume and fly ash, respectively and water to binder ratio(W/B) was ranged from 15% to 30%. Test results showed that RLA, HSRLA and BA had favorable distribution of grain shape, which is higher than 58%. The use of RLA and HSRLA is achieved higher compressive strength than others due to improved elastic properties of RLA and HSRLA. More interestingly, the results of autogenous shrinkage was reduced remarkably when RLA and HSRLA were used compared with the results of GA. This is also due the formation of monocarboaluminate associated with
A Study on Quality Characteristics of Urea Mixing Concrete considered with Thermal Stress and Drying Shrinkage
Kim, Yong-Bum ; Cho, Han-Byung ; Kim, Hak-Young ; Jun, Woo-Chul ; Park, Hee-Gon ; Chung, Lan ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 67~74
DOI : 10.5659/JAIK_SC.2015.31.7.67
Due to a big difference of temperatures between the inside and outside and a high level of hydration heat on the core, some thermal stress is generated in mass Concrete. In turn, it causes the expansion of the concrete members and some cracks of the concrete joints that become the factors threatening the soundness of a concrete structure. Due to the reason, various kinds of low-heat concrete are being developed in domestic and foreign countries. In this study, some urea for industrial use which is used in microorganism cultivation agents, etc., is applied as a concrete mixing material in order to suppress the hydration heat of mass concrete. This is intended to lower down some levels of hydration heat and drying shrinkage of mass concrete. 21 kinds of concrete mixtures in total were designed at 3 kinds of W/B ratios, that is, 45, 50 and 55%. Thus, the dynamic characteristics, durability and hydration heat properties of urea-mixed concrete were verified through some experiments and the optimum mixing design was suggested. As the results of this study, the compressive strength of urea-mixed concrete at the age of 3 days decreased by 40% compared to that of plain concrete, but it showed the tendency recovering up to 95% at maximum at the age of 56days. On the other hand, the maximum temperature of urea-mixed concrete decreased down to
at maximum thanks to the hydration heat compared with that of plain concrete and the point of time reaching the highest temperature of the urea-mixed concrete was delayed by 33.9 hours at maximum compared with that of plain concrete. In addition, it resulted that the length change rate of urea-mixed concrete decreased down to 56% at maximum thanks to the expansion characteristics of
Fire Property of Exterior wall applied Exterior Insulation System with Mineral Multi Pore Type Lightweight Insulation
Lee, Jong-Chan ; Park, Jong-Cheol ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 75~82
DOI : 10.5659/JAIK_SC.2015.31.7.75
The purpose of this study is to develop a exterior insulation wall construction method with fire safety. As a first step, domestic and aborad regulations were investigated, and three development factors were drawn: use of a non combustible insulation and a metal fixing material, application of a vertical fire spread prevention structure, and a vertical void block structure. First, dry type and wet type exterior insulation system were developed using the non combustible mineral insulation and the metal "L" type angle, which was adhered on the wall without void. Then a fire performance of the systems was evaluated by ISO 13785-2 large scale fire test. As results, mineral insulation occurred some cracks, but there was none of melting, falling and exfoliation during 25 min. Dry type aluminum panels were almost burned and fallen down, whereas wet type coat finish was only burned out on the face and there was none of falling and exfoliation. The highest temperature value was
at the upper part after 20 min and
at the lower part after 7 min. The highest heat flux value was 68 kw/m2 at the right point of bottom part, which was caused by crack of mineral insulation. It is need to study exterior fire test more and accumulate data and establish a fire performance standard by ISO 12785-2.
Proposal on the Evaluation Method of Segregation Resistance of Normal Strength Concrete
Han, Cheon-Goo ; Han, In-Deok ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 83~90
DOI : 10.5659/JAIK_SC.2015.31.7.83
Since the currently used segregation evaluation method is quantitative method based on the experience of operator, it has had many difficulties to adopt for practice. In this research, as a solution of this problem, new workability performance evaluation method was suggested using the performance levels based on the evaluation index of segregation for normal concrete (EISN) quantified by the maximum-to-minimum ratio of the flow of slumped concrete by the slump test. As the results of the experiment, when the range of the slump value was 150 to 230 mm, (slump flow value was 300 to 450 mm)the evaluation method was valid. Namely, as a base of 1.09 EISN, lower and higher ranges were determined as a "good" and "segregation", respectively, and further performance leveling was suggested with 1.06 - 1.09 for III level, 1.03 - 1.06 for II level, and 1.00 - 1.03 for I level within the "good" range. Within the good conditions of concrete, the categorized performance levels were suggested with level I, II, and III for 1.00 - 1.03, 1.03 - 1.06, and 1.06 - 1.09, respectively.
Construction Cost Estimate Model Based on Process Costing System
Yi, Kyoo-Jin ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 91~98
DOI : 10.5659/JAIK_SC.2015.31.7.91
Previous researches related to the estimation of construction cost are mainly based on the cost of materials and direct labour, and researches on the relationship between material and other account items are not much. Due to the recent development of construction machinery, the trend is that the percentage of labour cost is decreasing. With this trend of labour cost reduction and the growing proportion of outsourcing cost, research on the relationship among cost account items is required to be renewed. This study conducts a regression analysis based on the process costing system between 1989 and 2013, and proposed a cost estimation model for general construction, civil construction, and building construction. A comparison of the actual values and model-estimated values proves the validity of the estimation model.
A Study on Problem and Improvement of the Direct Buying System for Construction Materials - with Focus on the standpoint of field staffs in public institutions -
Shin, Kyoung-Hun ; Kim, Seong-Ah ; Chin, Sang-Yoon ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 99~108
DOI : 10.5659/JAIK_SC.2015.31.7.99
The government enacted the Act on Facilitation of Purchase of Small and Medium Enterprise-Manufactured Products and Support for Development of Their Markets, which obliged the direct buying of construction materials for public institutions. However, mandatory buyers proceeded without sufficient prearrangements with the public institutions. In field departments, these issues led to work problems caused by the rapidly increasing administrative workload, and many problems, such as defect treatment, were handled using the mandatory materials for small businesses. This study derived improvements for these processes and analyzed various problems in the field, employing a conventional survey following the enforcement of the Direct Buying System for construction materials. This study aimed to collect the issues of members of the government office through site visits, and these issues were classified into three levels (Level I: proceeding steps; Level II: major opinions; and Level III: detailed issues) according to three criteria: causes of occurrence, issue types, and work process. This study analyzed the importance of the opinions in the questionnaire survey. The major finding was that the manpower for handling purchasing was insufficient. This illustrates the problems caused by the strict enforcement of the Direct Buying System. This study suggests improvements based on the importance index.
Risk Analysis and Responding Strategies in Tender Stage for Successful Construction Project in China
Liu, Yue-Fei ; Oh, Jae-Hun ; Kim, Jin-Hui ; Huh, Young-Ki ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 109~116
DOI : 10.5659/JAIK_SC.2015.31.7.109
Although the depression of oversea construction market becomes more serious recent years, asian construction market is relatively dynamic, particularly in china. However, few research has been conducted about how to manage construction projects in china as foreign developers. Risk management is surely important for the success of a construction project conducted by a foreign developer in the country due to differences of systems as well as regulations. Important risks were identified by series of expert interviews and surveys using the WBS-RBS method, namely tender max. price error, bill of quantities error, inappropriate contract type etc, after explaining construction cost estimation method in China. Then, several risk responding strategies suggested by experienced experts are proposed. The results will be in the interests for those that are likely conduct construction projects in china as foreign bodies.
Identifying the Key Financial Ratios to Evaluate Korean Construction Firms' Soundness
Im, Haekyung ; Choi, Jaehyun ;
Journal of the Architectural Institute of Korea Structure & Construction, volume 31, issue 7, 2015, Pages 117~126
DOI : 10.5659/JAIK_SC.2015.31.7.117
Recently domestic recession of construction industry brought negative effects on many Korean construction firms. The firms started recognizing financial soundness as the highest priority. Management decisions were made based upon analysis results in terms of profitability and risk instead of simple number of contracts or sales amount. The firms should be able to identify financial risk factors and come up with strategies in a timely manner through analyzing key performance indicators. This study analyzed key financial ratios that affected the financial soundness of the construction firms by comparing the workout group and healthy group. As a result, the stability, activity, and productivity were derived as the most significant indicators, and equity ratio, total asset turnover ratio, and labor equipment ratio has been drawn into the most meaningful financial ratios. It is essential for the Korean construction firms to maintain healthy financial condition and increase productivity by enhancing management capabilities of the enterprises.