• 한국지진공학회논문집
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• 제25권1호
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• pp.1-9
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• 2021

Most commercial buildings among existing RC buildings in Korea have a multi-story wall-frame structure where RC shear wall is commonly used as its core at stairways or elevators. The members of the existing middle and low-rise wall-frame buildings are likely arranged in ordinary details considering building occupancy, and the importance and difficulty of member design. This is because there are few limitations, considerations, and financial burdens on the code for designing members with ordinary details. Compared with the intermediate or unique details, the ductility and overstrength are insufficient. Furthermore, the behavior of the member can be shear-dominated. Since shear failure in vertical members can cause a collapse of the entire structure, nonlinear characteristics such as shear strength and stiffness deterioration should be adequately reflected in the analysis model. With this background, an 8-story RC wall-frame building was designed as a building frame system with ordinary shear walls, and the effect of reflecting the shear failure mode of columns and walls on the collapse mechanism was investigated. As a result, the shear failure mode effect on the collapse mechanism was evident in walls, not columns. Consequently, it is recommended that the shear behavior characteristics of walls are explicitly considered in the analysis of wall-frame buildings with ordinary details.

• 국제초고층학회논문집
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• 제10권3호
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• pp.243-250
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• 2021

Y

• Earthquakes and Structures
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• 제20권2호
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• pp.175-185
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• 2021

This study strives to highlight the importance of considering the vertical ground motions (VGM) in the seismic evaluation of RC buildings. To this aim, IDA (Incremental Dynamic Analysis) is conducted on three code-based designed high-rise RC frame-core wall buildings using a suite of earthquake records comprising of significant VGMs. To unravel the significance of the VGM inclusion on the performance of the buildings, IDAs are conducted in two states (with and without the vertical component), and subsequently based on each analysis, fragility curves are developed. Non-simulated collapse criteria are used to determine the collapse state drift ratio and the area under the velocity spectrum (SIm) is taken into account as the intensity measure. The outcome of this study delineates that the inclusion of VGM leads to the increase in the collapse vulnerability of the structures as well as to the change in the pattern of inter-story drifts and failure mode of the buildings. The results suggested that it would be more conservative if the VGM is included in the seismic assessment and the fragility analysis of RC buildings.

• 한국건축시공학회지
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• 제24권4호
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• pp.495-506
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• 2024

PC공동주택은 RC공사와 달리 양중장비에 의한 작업이 주공정으로 공기가 산정되기 때문에 PC벽체를 포함한 양중 단위공정분석이 선행되어야 한다. 본 연구는 Core, 내부, 외부 PC벽체의 조립공정을 분석하여 PC공동주택 기준층 공사 Cycle 분석하는 것이다. 각 PC벽체의 양중과정 및 시간을 도출하였고, 그 결과를 사례에 적용하여 기준층 골조공사의 양중 사이클을 분석하였다. 순수 부재설치 기간은 5일로 분석되었고, PC부재별 작업시간 비중은 Core PC벽체는 약 16%, 내부 PC벽체는 약 8%, 외부 PC벽체는 약 18%로 분석되었다. 본 연구의 결과는 PC벽체가 적용된 PC공동주택 골조공사 시공계획 시, 핵심자료로 활용될 것이다.

• Earthquakes and Structures
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• 제12권3호
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• pp.263-270
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• 2017

In this study, two geometrically identical multi-storey steel buildings with different lateral load resisting systems are structurally analyzed under same earthquake conditions and they are compared with respect to their construction costs of their structural systems. One of the systems is a steel structure with eccentrically steel braced frames. The other one is a RC wall-steel frame system, that is a steel framed structure in combination with a reinforced concrete core and shear walls of minimum thickness that the national code allows. As earthquake resisting systems, steel braced frames and reinforced concrete shear walls, for both cases are located on identical places in either building. Floors of both buildings will be of reinforced concrete slabs of same thickness resting on composite beams. The façades are assumed to be covered identically with light-weight aluminum cladding with insulation. Purpose of use for both buildings is an office building of eight stories. When two systems are structurally analyzed by FEM (finite element method) and dimensionally compared, the dual one comes up with almost 34% less cost of construction with respect to their structural systems. This in turn means that, by using a dual system in earthquake zones such as Turkey, for multi-storey steel buildings with RC floors, more economical solutions can be achieved. In addition, slender steel columns and beams will add to that and consequently more space in rooms is achieved.

• 한국산업융합학회 논문집
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• 제25권4_2호
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• pp.611-619
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• 2022

In this study, the seismic performance of low - rise piloti buildings with concentric core (shear wall) position is analysed and reviewed based on KDS 41. The prototype is selected among the constructed low - rise piloti buildings with concentric core designed based on KBC 2005 which was used for many low - rise piloti buildings construction. The seismic performance of the building shows plastic behavior in X-direction and elastic behavior in Y-direction. The inter-story drift is lager than that of concentric core case and is under the maximum allowed drift ratio. The displacement ratio of first story is much lager the that of upper stories, and the frame structure in the first story is evaluated as vulnerable to lateral force. Therefore, low - rise piloti buildings with concentric core need the diminishment of lateral displacement and reinforcement of lateral resistance capacity in seismic design and seismic retrofit.

• 국제초고층학회논문집
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• 제4권3호
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• pp.181-189
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• 2015

Shimizu Corporation Tokyo Headquarters, one of the city's leading office buildings, features many pioneering technologies that contribute to a sustainable society through environmental stewardship and a sophisticated disaster management facility. In terms of structural engineering, a seismic isolation system incorporating reinforced concrete core walls and precast concrete perimeter frames create a robust structure in the event of a large earthquake. In addition to the seismic resistance of the structure, several pioneering construction methods and materials are adopted. This office building can serve as a basis for new design and construction approaches and methodologies to ensure safe and economical structures.

• 한국산학기술학회논문지
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• 제21권10호
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• pp.490-498
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• 2020

본 논문에서는 편심코아를 가지는 저층 필로티 건물의 내진거동을 해석하고 결과를 분석하였다. 본 논문에서는 저층 필로티 건물의 시공사례 중 KBC2005기준에 준하여 설계된 편심코어를 가지는 건물들의 설계자료를 수집하여, 대표적인 편심 필로티 건물을 프로토타입으로 선정하여 KDS41기준에 준하여 내진거동을 해석하고 결과를 분석하였다. 연구결과 편심코어를 가지는 필로티 건물의 경우 X방향은 소성거동, Y방향은 탄성거동을 하는 것으로 평가 되었다. 연구대상 건물의 층간 변위를 확인한 결과 최대변위 δ=67.51mm로 코어가 평면 중심에 위치하는 경우보다 층간 변위량이 더 큰 것으로 평가 되었다. 해석결과에서 층간 변위 비율은 법적 규준 이내인 것으로 평가되었다. 또한 변위 비율은 1층 필로티 구간이 2~4층 부분보다 확연히 높은 걸로 평가 되었으며, 저층 필로티 구조물의 경우 1층 라멘조 부분이 횡력에 취약한 것으로 평가되었다. 편심코어로 인하여 구조물 전체의 강성중심이 질량중심과 이격되어 있어 코어 반대쪽의 필로티 기둥에서 항복과 소성힌지 발생이 시작되므로 내진설계와 내진보강시 이에 대한 고려가 필요하다. 따라서, 편심코어를 가지는 저층 필로티 건물의 내진설계 및 내진보강시 필로티 구조의 횡변위 감소와 횡력저항능력을 보강할 필요가 있다.