• 한국BIM학회 논문집
• /
• 제11권1호
• /
• pp.21-30
• /
• 2021

Reinforcing bars, a major component of the pre-fab structure, adheres to the existing on-site assembly method and attempts to develop and commercialize the technology of the pre-assembly method, but the effect is insignificant. Welded Wire / Bar Mat (WBM) has various advantages such as commercialization of rebar through machine manufacturing to improve workability, but it is different from the existing design and the construction method is different from the previous one. Therefore, to maximize the advantages of WBM and improve productivity, manufacturing, transportation, and construction from the design stage should be considered based on BIM from the initial design stage. In this paper, the concept of the design support system for the WBM was established based on the use of BIM in concrete reinforcement and the preliminary research on the WBM. WBM conversion design was performed for the existing prefabricated members, and based on this, the exchange format and system of the master prefabricated model with the WBM design data were set up. As a result of the pilot test, it was found that the traditional reinforcing bar information extracted from the master prefab model has transmitted 100% accurately. As for the WBM information, 100% of the information on the straight reinforcement was transmitted and represented, and the information on the bent reinforcement was found to have a 90% recall in the master BIM tool.

• 한국건축시공학회지
• /
• 제1권2호
• /
• pp.174-178
• /
• 2001

This study was performed to control the thermal crack of the mat footing slab in the multi-purposed buildings. In this study, we executed the mixing design of concrete to satisfy the workability and the quality according to the site conditions. And, we evaluated quantitatively about the possibility of thermal crack by using hydration heat analysis system. Finally, we proposed the optimal mixing conditions, curing methods and curing period which all factors are considered. As a result, the optimal mixing conditions were : W/B 41%, unit binder 375kgf/$\textrm{m}^3$, FA replacement ratio 20%. Lowest thermal stress was 22.0kgf/$\textrm{cm}^2$ and at that time thermal crack index was over 1.5, when the coefficient of thermal conductivity was lowest among the curing conditions. And, the total curing time was estimated at 6.7 days according to curing steps.

• 한국농촌건축학회논문집
• /
• 제16권4호
• /
• pp.59-66
• /
• 2014

This paper deals with vibration of plates with concentrated mass on elastic foundation. The object of investigating natural frequencies of tapered thick plate on pasternak foundation by means of finite element method and providing kinetic design data for mat of building structures. Free vibration analysis that tapered thick plate in this paper. Finite element analysis of rectangular plate is done by use of rectangular finite element with 8-nodes. In order to analysis plate which is supported on pasternak foundation. The Winkler parameter is varied with 10, $10^2$, $10^3$ and the shear foundation parameter is 5, 10. This paper is analyzed varying thickness by taper ratio. The taper ratio is applied as 0.0, 0.25, 0.5, 0.75, 1.0. And the Concentrated Mass is applied as P1, Pc, P2 respectively.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2022년도 가을 학술논문 발표대회
• /
• pp.115-116
• /
• 2022

Large concrete mass members are commonly used as matte bases for skyscrapers. In general, Integral casting is preferred to secure construction convenience and durability quality rather than separate casting. However, there is a possibility that cracks may occur in the early stages due to the generation of a lot of hydration heat, and thus durability will decrease, so it is necessary to determine an appropriate mixture and verify it through experiments. The purpose of the study was to conduct a review on the durability of the optimal high-performance low-heating concrete combination derived through the experiment and to conduct a review analysis on the performance satisfaction and performance expression mechanism.

• Spatial Information Research
• /
• 제20권2호
• /
• pp.117-127
• /
• 2012

본 연구는 실내 GIS 모델을 구축하기 위한 위상학적 모델이 객체의 기하학적 특징을 반영할 필요성에 의해, 기하적 정보를 갖는 위상학적 모델인 기하 네트워크 모델을 자동 구축하는 알고리즘을 개발하는 것을 목적으로 한다. GNM의 요소 중 기하 정보를 갖는 요소를 자동 추출하기 위한 중심 알고리즘으로서 직선 중심축 추출 알고리즘을 개발하였다. 개발된 SMAT 알고리즘은 기존의 S-MAT 알고리즘을 활용하여 일반화되었고, 해당되는 객체의 범위를 단순 폴리곤에서 내부 폐색 구역을 갖는 폴리곤으로 확장하였다. 자동 구축된 GNM은 타 시스템에서의 활용 및 용이한 접근을 위해 최종적으로 .csv 파일로 출력된다. GNM 자동 추출 알고리즘은 최단 경로 탐색, 위급 상황 발생 시 대피로 안내, 상황에 따른 차별적 분석 등 다양한 경우에 효율적으로 활용될 수 있다.

• 대한안전경영과학회지
• /
• 제21권1호
• /
• pp.1-7
• /
• 2019

Along with industrial development, various architectural structures have become bigger and higher, leading to an expansion in the size and capacity of construction equipment. And with the development of public transportation, the use of subways as a means of transportation in the city center is increasing, so that vibrations and structural noises are emerging as a new environmental issue. Considering that architectural structures may be used from several decades to hundreds of years after the time of construction, they can be seen as semi-permanent. Due to changes in the vibration-proof polyurethane mats installed in the foundation of these structures, settling may occur and vibration reduction may become inadequate. Therefore, in view of service life, it is necessary to have a high-level standard of reliability and stability. In accordance with this, the Floating Floor System, which uses soft polyurethane foam and can be constructed within a relatively short period of time, has excellent vibration resistant characteristics. It is presented as a great alternative solution to the issue of vibrations caused by subways, railways and building structures. At present, vibration-proof polyurethane mats have been developed up to the same product level as in other advanced countries. However, in the construction of structure foundations, the physical properties of this product and its shape incur changes. If they are installed as such in the structure of a building, it may cause significant impact on stability, requiring that this cause be urgently identified and improved.

• 수산해양교육연구
• /
• 제25권1호
• /
• pp.274-286
• /
• 2013

The purpose of this study was to analyze educational functions of Kyujanggak(奎章閣) during King Jeongjo(正祖) and reflect its significance Kyujanggak was established by King Jeongjo in 1776. The main function of Kyujanggak was keeping and managing Eopil(御筆) and it continued to perform what Jiphyeonjeon(集賢殿) had done. Among the functions of Kyujanggak, there found several critical ones that today's educational institution needs to do: 1) library function including collecting, keeping, and utilizing books 2) education of elites like Chogyemoonsin(抄啓文臣) 3) writing and publishing to encourage writing customs(文風振作) 4) the classic-mat lectures(經筵) to facilitate King's learning. Across the ages and in all countries of the world, education is the dynamic force and bulwark, Also, library is the treasure house and center of traditional culture. Especially, Kyujanggak has been estimated to perform the functions of both education and library successfully. The results indicated that the practice of Kyujanggak reminds us that the educational mind and leadership of the top leader of nation is the primary and decisive factor in building a strong culture-nation.

• 한국건축시공학회지
• /
• 제17권1호
• /
• pp.39-46
• /
• 2017

최근 건축물의 기초는 구조체의 안정성과 연관하여 두꺼운 매스콘크리트 형태가 설계되어지고 있다. 그런데, 이와 같은 매트 매스콘크리트는 800mm 이상의 두꺼운 부재로 설계되는 경우가 많아짐에 따라 수화열에 의한 균열이 문제점으로 제기 되고 있다. 이에, 본 연구에서는 상 하부를 구분하여 타설하는 실무조건을 고려하여, 컴퓨터 프로그램상으로 하부와 상부의 최적치를 도출한 다음, 실구조체에 적용 해석치와 실측치간을 비교하므로서 효율적인 수화열균열 저감방안을 제안하고자 하였다. 그 결과, 상 하부 타설 콘크리트간의 저발열 배합정도를 고려한 수화발열량차 적용은 침하균열 방지 및 수화열 균열제어에 효과적인 것으로 밝혀졌다.

• 전산구조공학
• /
• 제9권1호
• /
• pp.23-32
• /
• 1996

본 논문에서는 건물 기초 설계의 자동화를 위한 규칙 기반 시스템을 개발하였다. 상부구조의 설계 결과와 지반 조사 보고서로부터의 지반에 관한 자료를 읽어 들여 허용지내력을 추정하고 주어진 상황에 적절한 기초형식을 추론하는 방법을 제안하였다. 허용지내력은 표준관입시험치로부터 추정하였고, 이를 바탕으로 각 기중과 벽체의 기초형식은 우선 독립기초와 벽체기초라고 가정하여 그 크기를 계산하고 각 기초의 중첩여부를 조사하여 중첩되는 기초들은 본 논문에서 개발한 기초 합병의 방법을 이용하여 새로운 기초형식으로 변경되도록 하였다. 개발된 시스템은 주어진 상부구조 설계결과와 지반조건에 대하여 적절한 기초형식을 선정하여 그에 따른 배근 설계를 쉽게 할 수 있도록 해준다.

• 한국건축시공학회지
• /
• 제9권2호
• /
• pp.39-46
• /
• 2009

The erection bar is defined as the assistant bar used to fix the position of the reinforcing steel as the reinforcing steel is placed on site. As the erection bar do not bear the structural load and is not showed in the structural drawings, it is not managed importantly. But as chair bars in mat footing is used in large quantities to support the upper main bars, the detailing standards need to be suggested. and some erection bar is placed by experience of the fabricator and placer. Therefore, in this study, a survey about the erection bars was conducted to the reinforcement detailer, the fabricator and placer of domestic construction industry. 11 placing drawings is analyzed to find out the problems of detailing and the quantities of the erection bars. According to the analysis of the survey, the erection bar details in placing drawings were not standardized, and some erection bars are omitted in placing drawings. The improvement in the erection bar detailing was sought by analyzing the results of the survey.