• 한국전산구조공학회논문집
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• 제36권6호
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• pp.371-380
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• 2023

지진취약도를 산정하기 위해서는 목표 부지의 특성을 제대로 표현할 수 있는 입력 지진파의 산정이 중요하다. 본 논문에서는 국내외 강진 및 중‧약진 지역에서의 입력 지진파에 대한 단자유도 모델의 지진취약도를 분석하였다. 분석을 위한 첫 번째 단계로, 국외 강진 기록 중 근/원거리에서 측정한 2개의 입력 지진파 세트와 국내 중·약진 지역 특성에 적합한 입력 지진파 2개의 세트, 총 4개의 입력 지진파 세트를 선정하였다. 대상 구조물로는 3가지 고유주기에 대한 비선형 단자유도 모델을 적용하였고, 취약도 분석을 위해 증분동적해석을 이용하였다. 또한, 4가지 손상 상태를 정의하고, 손상 상태 각각에 대해 4가지 입력 지진파 세트의 고유주기별 지진취약도 결과를 제시하였다.

• 한국BIM학회 논문집
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• 제9권1호
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• pp.42-51
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• 2019

Maintenance of aging structures has attracted societal attention. Maintenance of the aging structure can be efficiently performed with a digital twin. In order to maintain the structure based on the digital twin, it is required to accurately detect the damage of the structure. Meanwhile, deep learning-based damage detection approaches have shown good performance for detecting damage of structures. However, in order to develop such deep learning-based damage detection approaches, it is necessary to use a large number of data before and after damage, but there is a problem that the amount of data before and after the damage is unbalanced in reality. In order to solve this problem, this study proposed a method based on Generative adversarial network, one of Generative Model, for generating acceleration data usually used for damage detection approaches. As results, it is confirmed that the acceleration data generated by the GAN has a very similar pattern to the acceleration generated by the simulation with structural analysis software. These results show that not only the pattern of the macroscopic data but also the frequency domain of the acceleration data can be reproduced. Therefore, these findings show that the GAN model can analyze complex acceleration data on its own, and it is thought that this data can help training of the deep learning-based damage detection approaches.

• Computers and Concrete
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• 제12권2호
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• pp.211-228
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• 2013

The structure analyzed in this paper has particular building style and special structural system. It is a rigid-connected twin-tower skyscraper with asymmetrical distribution of stiffness and masses in two towers. Because of the different stiffness between the north and the south towers, the torsion seismic vibration is significant. In this paper, in order to study the seismic response of the structure under both frequent low-intensity earthquakes as well as rare earthquakes at the levels of intensity 7, the analysis model is built and analyzed with NosaCAD. NosaCAD is an nonlinear structure analysis software based on second-development of AutoCAD with ObjectARX. It has convenient modeling function, high computational efficiency and diversity post-processing functions. The deformations, forces and damages of the structure are investigated based on the analysis. According to the analysis, there is no damage on the structure under frequent earthquakes, and the structure has sufficient capacity and ductility to resist rare earthquakes. Therefore the structure can reach the goal of no damage under frequent earthquakes and no collapse under rare earthquakes. The deformation of the structure is below the limit in Chinese code. The time sequence and distribution of damages on tubes are reasonable, which can dissipate some dynamic energy. At last, according to forces, load-carrying capacity and damage of elements, there are some suggestions on increasing the reinforcement in the core tube at base and in stiffened stories.

• 화약ㆍ발파
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• 제29권2호
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• pp.1-12
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• 2011

외부폭발, 화재, 충돌, 지진, 태풍과 같은 비정상 하중에 의한 고층빌딩의 연쇄붕괴(progressive collapse) 해석에 관련된 많은 연구가 진행되고 있다. 특히 그러나 실규모의 고층건물을 대상으로 한 손상 및 붕괴에 실험은 현실상 불가능한 실정이다. 본 연구에서는 구조물 발파해체분야에서 적용되는 ELS 소프트웨어를 이용하여 외부폭발에 의한 고층 RC 구조물의 국부손상 및 연쇄붕괴시뮬레이션을 수행하였다. 현관으로부터 1m, 2m, 5m, 10m, 15m 이격되어 폭약 1,500kg이 폭발한 것을 가정하여, 이격거리에 따른 국부손상과 이에 따른 연쇄붕괴현상을 파악하였다. 특히 기폭시나리오에 따라 구조물 지지부재의 일부를 제거하여 구조물의 붕괴를 유도하는 발파해체기법을 국부손상-연쇄붕괴 전이과정 연구에 적용하였다.

• 콘크리트학회논문집
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• 제26권5호
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• pp.599-606
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• 2014

초고층 건물의 연쇄붕괴는 큰 피해를 발생시키므로 초고층 건물의 설계 단계에서 반드시 고려해야할 사항이다. 유한요소법을 이용한 초고층 건물의 연쇄붕괴 해석은 해석 시간이 지나치게 많이 소요되어 사실상 불가능하다고 할 수 있다. 본 논문에서는 유한 요소법의 대안으로 응용 요소법을 이용한 연쇄붕괴 해석의 유용성을 살펴보았다. 초고층 건물의 연쇄붕괴 해석을 위하여 규모 축소 모델링 방안을 제안하였다. 제안한 규모 축소 모델링 방안은 폭파하중의 직접적인 피해를 받는 부분만 해석모델에 포함하고 제외되는 나머지 부분의 질량과 전달하중 그리고 강성은 하나의 층에 집중시키는 방법이다. 20층 고층 철근콘크리트 건물에 대한 전체 모델과 축소된 모델을 세 가지 연쇄붕괴 시나리오에 대하여 연쇄붕괴 해석을 수행하고 그 결과를 비교하였다. 축소 모델은 전체 모델과 유사한 연쇄붕괴 양상을 보여 주지만 소요된 시간은 전체 모델의 약30%로 줄일 수 있었다. 본 논문에서 제안된 연쇄붕괴 해석 방안은 비정상 하중에 의한 초고층 건물의 연쇄붕괴 해석에 유용하게 사용될 수 있다.

• Structural Engineering and Mechanics
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• 제11권6호
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• pp.663-672
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• 2001

Numerous failures in welded connections in steel moment-resisting building frames (SMRF) were observed when buildings were inspected after the 1994 Northridge Earthquake. These observations raised concerns about the effectiveness of such frames for resisting strong earthquake ground motions. The behavior of SMRFs during an earthquake must be assessed using nonlinear dynamic analysis, and such assessments must permit the deterioration in connection strength to capture the behavior of the frame. The uncertainties that underlie both structural and dynamic loading also need to be included in the analysis process. This paper describes the analysis of one of approximately 200 SMRFs that suffered damage to its welded beam-to-column connections from the Northridge Earthquake is evaluated. Nonlinear static and dynamic analysis of this SMRF in the time domain is performed using ground motions representing the Northridge Earthquake. Subsequently, a detailed uncertainty analysis is conducted for the building using an ensemble of earthquake ground motions. Probability distributions for deformation-related limit states, described in terms of maximum roof displacement or interstory drift, are constructed. Building fragilities that are useful for condition assessment of damaged building structures and for performance-based design are developed from these distributions.

• 한국건축시공학회지
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• 제13권6호
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• pp.522-529
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• 2013

As concrete forms, panel forms made of plywood used to be widely used, but recently a system form made of aluminum has been broadly adopted because of the advantages it offers in terms of constructability and economy. However, an aluminum form reacts with concrete, which is alkali, and creates hydrogen gas. As a result, air pockets occur on the concrete's surface, and its finishability deteriorates. Therefore, this research analyzed the relationship between the distribution of voids and surface roughness and the damage degree and number of uses of the aluminum form. The analysis of the distribution of voids shows that the number of voids of 0.1~1 mm, which are considered to have occurred because of chemical reaction, was 200~500 on the coating plywood, but was 1 500~2 000 on the aluminum form after 3 uses, and impossible to count after a higher number of uses. Surface roughness was $1.7{\sim}3.2{\mu}m$ on the coating plywood form, but was about $2.6{\mu}m$ after the first use and about $6.8{\mu}m$ after 10 uses, a 2.6-fold increase. Distribution of voids did not show a particular tendency depending upon the degree of damage to the concrete form, but surface roughness showed an increasing tendency as the degree of damage grows. Therefore, when using aluminum forms, surface maintenance should be carried out completely, such as prevention of damages to the form surface coating materials and spreading of separating materials on forms.

• 한국화재소방학회논문지
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• 제23권4호
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• pp.91-97
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• 2009

초고층 건물이라는 특수 장소에서 화재가 발생하였을 경우에 야기될 수 있는 제반 문제점을 도출하여 인적, 물적 피해를 최소화하기 위해서 초고층 건물 내에 존재하는 잠재위험요인을 찾아내 위험이 얼마나 큰가를 분석하여 그 해결 방안을 모색하여야 한다. 예방적 측면에서 화재예방활동을 통하여 화재의 발생을 억제하거나, 진압적 측면에서 화재발생과 동시에 초기 진화하는 것이겠지만, 화재의 진행과정을 미리 예측하거나 진행경로를 차단하는 인텔리젠트 또는 파이어 그리드를 이용한 과학소방적 진압방안의 도입이 필요하다.

• 대한안전경영과학회지
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• 제14권3호
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• pp.77-83
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• 2012

Recently, For the most efficient use of spaceis, high-rise buildings tend to increase. So it is with Korea, too. Besides, today high-rise buildings grows due to fire damage to life and property at large. In this study, Through analysis of domestic and foreign fire case and listen to the high-rise building fire managers, tenants, professionals advice, when the fire from the high-rise building, effective fire suppression tactics should we wish to research ways. In addition, we have used the car gondola was installed outside the fire suppression methods in studying. So that fire-fighting is a fire place can be reached quickly, many casualties and property damage, will be reduced.

• Earthquakes and Structures
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• 제5권3호
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• pp.277-296
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• 2013

Margin of safety against potential of progressive collapse is among important features of a structural system. Often eccentricity in plan of a building causes concentration of damage, thus adversely affects its progressive collapse safety margin. In this paper the progressive collapse of symmetric and asymmetric 3-story reinforced concrete ordinary moment resisting frame buildings subjected to the earthquake ground motions are studied. The asymmetric buildings have 5%, 15% and 25% mass eccentricity. The distribution of the damage and spread of the collapse is investigated using nonlinear time history analyses. Results show that potential of the progressive collapse at both stiff and flexible edges of the buildings increases with increase in the level of asymmetry in buildings. It is also demonstrated that "drift" as a more easily available global response parameter is a good measure of the potential of progressive collapse rather than much difficult-to-calculate local response parameter of "number of collapse plastic hinges".