• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2012년도 춘계 학술논문 발표대회
• /
• pp.331-332
• /
• 2012

Structural steel has been used as a primary materials to columns and beams since 1960's in Korea with an advantages of excellent of load-bearing capacity and design flexibility, and faster construction. However, if the steel columns made of structural steel exposed to fire the load-bearing capacity is going down steadily and finally reach to collapse. Therefore, building regulation requires fire resistance according to building occupation, scales. The fire resistance can be evaluated two categories. One is prescriptive method that is based on building regulation, specification and so on and the other is performance-based fire engineering method. The latter can be designed based on scientific and engineering consequences. The easiest evaluation way using the fire engineering design is comparing to the limiting temperature and maximum temperature calculated based on heat transfer theory. If the limiting temperature of a column exceeds the maximum temperature of it, the column can carry the load during the fire. Therefore, the database of limiting temperature is very essential for evaluation of column. In this paper, to build the database of column made of rectangular hollow sections 8 fire tests with loading were conducted and the relation between the limiting temperature and the applied loads showed in reverse proportion.

• 국제학술발표논문집
• /
• The 6th International Conference on Construction Engineering and Project Management
• /
• pp.564-567
• /
• 2015

The incorporation of sustainability principles into the structural engineering design of buildings is increasingly important. Historically the focus of improvements to the environmental performance of structures has been operational energy considerations. Current research has highlighted the requirement for changing the approach by increasing the consideration of embodied energy in structures. This research was conducted to build on previous research by the authors in quantifying the contribution of column optimization to the embodied energy performance of concrete framed buildings. Ultimately, the authors intend to develop mechanisms through which sustainable design can be quantified, enabling alleviation prior to construction. Columns are a key structural element to consider as part of this development process. The outcomes of this assessment reinforced previous findings, observing that reduced structural weight as a result of other sustainable design measures carries manifold benefits include column design savings. Through the quantification of the embodied energy outcomes during this research phase, the columns were shown to contribute up to 19.71% of the total embodied energy of the structural system dependent upon construction technique used.

• 한국구조물진단유지관리공학회 논문집
• /
• 제22권5호
• /
• pp.101-109
• /
• 2018

모듈형 구조시스템은 학교 및 아파트 건물과 같은 저층 및 중층 구조물에 점점 더 많이 사용되고 있다. 최근에는 고층 건물에 모듈러 구조시스템을 적용하는 방법에 대한 연구가 수행되고 있다. 고층 모듈러 구조시스템에 대해 충분한 저항력과 경제적인 구조를 제공하기 위해 복합모듈 구조시스템이 제안되었다. 본 연구에서는 일련의 실험을 통해 단위 복합모듈 구조에 적용하기 위한 목적으로 비대칭 복합 기둥의 강도를 평가하고자 하였다. 실험적 연구는 기둥의 세장비, 편심율 및 관통바 유무에 따라 기둥의 강도에 미치는 영향에 중점을 두었다. 단위 모듈구조에 대한 비대칭 기둥단면의 설계식을 제안하였다. 결과로부터, 설계식은 단위 복합모듈 구조에서 비대칭 기둥단면의 적절한 강도 예측을 제공한다는 것을 알 수 있다.

• 콘크리트학회논문집
• /
• 제12권4호
• /
• pp.59-67
• /
• 2000

With increased height of structure, the effect of column shortening need special consideration in the design and construction of high-rise buildings. The shortening of each column affects nonstructural members such as partitions, cladding, and M/E systems, which are not designed to carry gravity forces. The slabs and beams will tilt due to the cumulative differential shortening of adeacent vertical members. The main purpose of estimating the total shortening of vertical structural member is to compensate the differential shortening between adeacent members. This paper presents effect of parameters for phenomenon of column shortening in vertical members. The paper presents effect of parameters for phenomenon of column shortening in vertical members. The conclusions obtained from this study are follow as ; Strength of concrete and steel ratio effected on column shortening caused by elastic and inelastic shortening. Also, it is known that Ultimate-shrinkage-Value, Specific-Creep-Value, and volume to surface ratio effected on inelastic shortening only. Particularly, Ultimate-Shrinkage-Value and Specific-Creep-Value effected considerable on the amount of total column shortening.

• 제어로봇시스템학회논문지
• /
• 제12권12호
• /
• pp.1197-1201
• /
• 2006

In order to improve the operability in a fully thermally coupled distillation column the main column is separated into an upper and a lower column, and its design method is explained. With a distillation experiment using a two-inch column the operability of the proposed column is examined. Readily available methanol, ethanol and propanol are used as the feed, and the experimental result is compared with that of the HYSYS simulation. It is found from the experiment that the recovery ranges between 58.8% and 68% and the distillation efficiency is lower than that of the simulation. consumes less energy than an original column, it is not widely implemented in practice due to its operational difficulty. However, it is proved that the proposed distillation column can be operated without compressors and it can be practically utilized.

• Advances in Computational Design
• /
• 제1권1호
• /
• pp.61-77
• /
• 2016

Seismic performance of structures depends on the force flow mechanism inside the structure. Discontinuity regions, like beam-column joints, are often affected during earthquake event due to the complex and discontinuous load paths. The evaluation of shear strength and identification of failure mode of the joint region are helpful to (i) define the strength hierarchy of the beam-column sub-assemblage, (ii) quantify the influence of different parameters on the behaviour of beam-column joint and, (iii) develop suitable and adequate strengthening scheme for the joints, if required, to obtain the desired strength hierarchy. In view of this, it is very important to estimate the joint shear strength and identify the failure modes of the joint region as it is the most critical part in any beam-column sub-assemblage. One of the most effective models is softened strut and tie model which was developed by incorporating force equilibrium, strain compatibility and constitutive laws of cracked reinforced concrete. In this study, softened strut and tie model, which incorporates force equilibrium equations, compatibility conditions and material constitutive relation of the cracked concrete, are used to simulate the shear strength behaviour and to identify failure mechanisms of the beam-column joints. The observations of the present study will be helpful to arrive at the design strategy of the joints to ensure the desired failure mechanism and strength hierarchy to achieve sustainability of structural systems under seismic loading.

• Structural Engineering and Mechanics
• /
• 제50권2호
• /
• pp.201-214
• /
• 2014

Due to the confinement effects, Steel-Straps Tensioning Technique (SSTT) can significantly enhance the strength and ductility of high-strength concrete (HSC) members (Moghaddam et al. 2008). However, the enhancement especially in strength may result in slender member and more susceptible to instability (Jiang and Teng 2012a). This instability is particularly significant in HSC member as it inherent the brittle nature of the material (Galano et al. 2008). The current slenderness limit expression used in the design is mainly derived from the experiment and analysis results based on Normal strength concrete (NSC) column and therefore the direct application of these slenderness limit expressions to the HSC column is being questioned. Besides, a particular slenderness limit for the SSTT-confined HSC column which incorporated the pre-tensioned force and multilayers effects is not yet available. Hence, an analytical study was carried out in the view of developing a simple equation in order to determine the slenderness limit for HSC column confined with SSTT. Based on the analytical results, it was concluded that the existing slenderness limit expressions used in the design are appropriate for neither HSC columns nor SSTT-confined HSC columns. In this paper, a slenderness limit expression which has incorporated the SSTT-confinement effects is proposed. The proposed expression can also be applied to unconfined HSC columns.

• 한국해양공학회지
• /
• 제36권3호
• /
• pp.168-180
• /
• 2022

The IMO has decided to proceed with the early introduction of EEDI Phase 3, a CO₂ emission regulation to prevent global warming. Measures to reduce CO₂ emissions for ships that can be applied immediately are required to achieve CO₂ reduction. We set six different CO₂ emission scenarios according to the type of ship and fuel, and designed a monoethanolamine-based CO₂ capture process for ships using a rate-based model of Aspen Plus v10. The simulation model using Aspen Plus was validated using pilot plant operation data. A ship inevitably tilts during operation, and the performance of a tilted column decreases as its height increases. When configuring the conventional CO₂ capture process, we considered that the required column heights were so high that performance degradation was unavoidable when the process was implemented on a ship. We applied a parallel column concept to lower the column height and to enable easy installation and operation on a ship. Simulations of the parallel column confirmed that the required column height was lowered to less than 3 TEU (7.8 m).

• 한국구조물진단유지관리공학회 논문집
• /
• 제19권6호
• /
• pp.112-118
• /
• 2015

최근 도심지에 건설되는 건축물의 초고층화는 기둥에 작용하는 하중을 증가시켜 기둥단면 증가와 사용면적 확보의 어려움을 발생시키고 있다. 이에 최근에는 CFT와 같은 합성기둥의 사용이 증가하고 있는 추세이다. 그러나 CFT 기둥의 경우 폐단면으로 이루어져 있어 보-기둥 접합부 개발의 어려움과 성능저하의 문제가 발생하게 된다. 특히, 원형CFT 기둥과 외다이아프램을 이용한 접합상세 개발의 연구가 미비한 실정이다. 이에 본 연구에서는 Y형 플레이트를 적용한 원형 CFT 기둥-H형강 보 접합부 접합상세를 개발하여 Y형 플레이트를 적용한 접합부 구조성능에 영향을 미치는 Y형 플레이트 폭 및 두께를 주요변수로 설정하여 실험을 통해 구조성능을 평가하였다. 또한 실험체에 사용된 Y형 플레이트는 설계기준에 제시된 장기허용인장력이 Y형 플레이트에 접합된 인장 측 플랜지의 축방향력 이하가 되도록 설계하여 파괴형태를 통해 Y형 플레이트의 구조적 안전성과 성능을 확인하고자 한다.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
• /
• pp.173-173
• /
• 2010

This thesis identified basic design elements (Sustainable Yield, Temperature of Groundwater, Depth of Well, Separation Distance between wells) regarding installation of Standing Column Well, Geothermal Heat pump System by dynamic analysis.