• 한국공간구조학회논문집
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• 제22권4호
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• pp.71-79
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• 2022

Recently, the construction of tall buildings utilized by high strength-concrete in the whole world is tending to be on the rise. The application of high-rise structural system in buildings results in the excellent cut-down effect in construction materials due to section reduction. Therefore, in order to investigate the CO₂ and resource reduction effect for the high-rise structural system, comparisons of GWP and ADP in embodied energy of structural materlais between 4 type of high-rise structural system have been performed. As a result, GWP emission increased in the order of steel structure outrigger system, RC shear wall system, and RC outrigger system. On the other hand, ADP emissions increased in the order of RC shear wall system, RC outrigger system, and steel structure outrigger system.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2001년도 가을 학술발표회 논문집
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• pp.3-10
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• 2001

The box system that is composed only of reinforced concrete walls and slabs are adopted on many high-rise apartment buildings recently constructed in Korea. And the framed structure with shear wall core that can effectively resist horizontal forces is frequently adopted for the structural system for high-rise building structures. In these structures, a shear wall may have one or more openings for functional reasons. It is necessary to use subdivided finite elements for accurate analysis of the shear wall with openings. But it would take tremendous amount of computational time and memory if the entire building structure is subdivided into a finer mesh . An efficient analysis method that can be used regardless of the number, size and location of openings is proposed in this study, The analysis method uses super element, substructure, matrix condensation technique and fictitious beam technique. Three-dimensional analyses of the box system and the framed structure with shear wall core having various types of openings were performed to verify the efficiency of the proposed method. It was confirmed that the proposed method have outstanding accuracy with drastically reduced time and computer memory from the analyses of example structures.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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• pp.673-678
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• 1997

The main structural system of domestic apartments is the wall-slab system. In such structures, the lack of material strength of wall affects severely on the safety of structures. It is fond frequently that the wall in the apartment structures has lower strength in concrete than the specified. This paper presents the retrofitting method of the reinforced concrete wall with low concrete strength. The tests are performed to investigate the structural behavior and the effects of external reinforcing and thickness increasing on the axial load capacity of walls. Six specimens are tested. As the test results, the external reinforcing method is less effective than thickness increasing method.

• Structural Engineering and Mechanics
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• 제29권4호
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• pp.433-453
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• 2008

The equation of motion of a one way (vertical) spanning strip wall, as an assembly of two rigid bodies, is presented. Only one degree of freedom is needed to completely describe the wall response as the bodies are assumed to be perfectly rectangular and are allowed to rock but not to slide horizontally. Furthermore, no arching action occurs since vertical motion of the upper body is not restrained. Consequently, the equation of motion is nonlinear, with non constant coefficients and a Coriolis acceleration term. Phenomena associated with overburden to self weight ratio, motion triggering, impulsive energy dissipation, amplitude dependency of damping and period of vibration, and scale effect are discussed, contributing to a more complete understanding of experimental observations and to an estimation of system parameters based on the wall characteristics, such as intermediate hinge height and energy damping, necessary to perform nonlinear time history analyses. A comparison to a simple standing, or parapet, wall is developed in order to better highlight the characteristics of this assembly.

• 한국구조물진단유지관리공학회 논문집
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• 제3권2호
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• pp.185-190
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• 1999

It is difficult to estimate for deterioration of exterior wall by infrared thermography, because of amount of infrared-ray radiation effected by environmental factors such as temperature properties of materials, the outside air and the amount of solar radiation. Therefore we measured the distribution of temperature by times in the same reinforced-concrete structure in order to reduce problems, occasioned by environmental factors, then we analyzed physical influence factors of the infrared thermography. It is the aim of this study to suggest basic data with regard to method of estimation-system for deterioration of exterior wall in reinforced-concrete structures.

• Earthquakes and Structures
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• 제15권4호
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• pp.351-360
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• 2018

Energy-based methodology is utilized to design novel timber-steel hybrid core wall system. The timber-steel core wall system consists of cross laminated timber (CLT), steel columns, angled brackets and t-stub connections. The CLT wall panels are stiff and strong, and ductility is provided through the steel t-stub connections. The structural system was modelled in SAP2000 finite element program. The hybrid system is explained in detail and validated using first principles. To evaluate performance of the hybrid core system, a 7-story building was designed using both forced-based design and energy based design (EBD) approaches. Performance of the structure was evaluated using 10 earthquakes records selected for 2500 return period and seismicity of Vancouver. The results clearly served as a good example of the benefits of EBD compared to conventional forced based design approaches.

• 한국구조물진단유지관리공학회 논문집
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• 제11권1호
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• pp.153-162
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• 2007

1988년 이전에 건설된 벽식 구조 아파트는 내진규정의 적용을 받지 않아 리모델링을 위해서는 현행법규에 적합한 내진보강이 필요하다. 본 연구에서는 벽체 신설 공법에 의한 내진 보강효과를 분석하기 위하여, 개발된 리모델링 건축 평면 내에서 전단벽의 신설이 가능한 위치별 보강 효과와 벽량 및 벽두께의 변화에 따른 내진 보강 효과를 분석하도록 하였다. 내진성능의 평가는 층간 횡 변위를 이용하여 허용 층간변위의 만족여부에 의하여 분석하였으며, 건축물의 구조 모델은 슬래브의 횡 방향 기여도를 고려한 유효보 모델을 사용하였다. 본 연구의 결과에 따르면 리모델링 시 단위 모듈별 내진보강이 가능하며, 전단벽의 신설 위치와 벽량에 따라 건물 건체의 거동에 영향을 받는 것을 확인 할 수 있다.

• 한국공간구조학회논문집
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• 제19권4호
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• pp.77-84
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• 2019

This study introduces a newly developed PC non-bearing wall system to prevent the damage of RC wall-type apartments that have been heavily damaged by the 2017 Pohang Earthquake. In order to evaluate the performance of the developed PC non-bearing wall system, a static cyclic test is conducted. The prototype of test specimen is from the RC wall-type apartment which has been severely damaged by the 2017 Pohang Earthquake. The specimen with the conventional non-bearing wall system showed the similar damage of RC wall type apartment suffered from the Pohang Earthquake. In case of the specimen with the developed PC non-bearing wall system, cracks and damages were not transmitted between the walls due to the seismic slit and there were almost no cracks in the non-bearing walls. Therefore, the proposed non-bearing wall system, separated from the structural walls, could prevent spreading cracks to bearing walls and make it possible to effectively control damage due to earthquake loads.

• 한국강구조학회 논문집
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• 제17권3호통권76호
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• pp.253-262
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• 2005

본 논문에서 제시된 스터드-런너 골조형 벽체시스템은 일반구조용 각형강관(열간성형강)을 구조부재로 사용하여 벽체를 구성하고, 수평부재인 런너에 의해 보강되어 있기 때문에 스틸하우스와 비교하여 단위벽체의 내력성능 증가 및 좌굴에 대한 효율적 거동을 기대할 수 있으며, 또한 경량기포콘크리트를 충전함으로써 차음성능 및 단열의 효과를 기대할 수 있다. 이와 같은 시스템을 중 저층(3~5층)규모의 공동주택 및 사무실건물에까지 적용하기 위해, 런너의 설치간격과 경량기포콘크리트의 타설효과를 변수로 하여 실제규모의 단위벽체를 시험체로 제작하여 연직하중 및 수평하중에 대한 내력성능평가가 필요하다. 따라서, 본 논문에서는 경량기포콘크리트의 타설효과를 고려하여 연직하중에 대한 축내력성능평가와 수평하중에 대한 전단내력성능평가를 통해 스터드-런너 골조형 벽체시스템의 구조적성능을 분석하고자 한다.

• Computers and Concrete
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• 제30권2호
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• pp.113-126
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• 2022

Reinforced concrete bearing walls (RCBWs) are one of the most applicable structural systems. Therefore, vulnerability analysis and rehabilitation of the RCBW system are of great importance. In the present study, in order to the more precise investigation of the performance of this structural resistant system, pushover and nonlinear time history analyses based on several assumptions drawing upon experimental research were performed on several models with different stories. To validate the nonlinear analysis method, the analytical and experimental results are compared. Vulnerability evaluation was carried out on two seismic hazard levels and three performance levels. Eventually, the need for seismic rehabilitation with the basic safety objective (BSO) was investigated. The obtained results showed that the studied structures satisfied the BSO of the seismic rehabilitation guidelines. Consequently, according to the results of analyses and the desired performance, this structural system, despite its high structural weight and rigid connections and low flexibility, has integrated performance, and it can be a good option for earthquake-resistant constructions.