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비틀림 초고층 프로토타입 모델에 대한 시공단계해석의 적용
최미미,김재요,엄태성,장동운,Choe, Mi-Mi,Kim, Jae-Yo,Eom, Tae-Sung,Jang, Dong-Woon 한국전산구조공학회 2013 한국전산구조공학회논문집 Vol.26 No.1
비정형 초고층 건물의 계획 및 시공이 늘어남에 따라 이 연구에서는 프로토타입 모델에 대한 시공단계해석의 적용을 통하여 비정형 초고층 건물의 시공 중 구조적 거동을 분석하고자 하였다. 비틀림 초고층 건물을 대상으로 횡력저항시스템, 비틀림각도, 공법 조건에 따른 총 18개의 모델을 선정하였다. 횡력저항시스템으로는 다이아그리드 시스템과 가새튜브 시스템을 적용하였으며, 각 횡력저항시스템별로 $0^{\circ}$, $1^{\circ}$, $2^{\circ}$ 비틀림각도를 갖는 세 가지 평면 형태와 외곽 튜브와 내부 골조의 시공순서에 따른 세 가지 공법을 가정하였다. 시공 중인 초고층 건물의 구조적 성능은 시공단계해석의 횡변위 결과를 통하여 분석되었으며, 골조 공기와 최대 양중량과 같은 시공성능이 함께 비교되었다. With regard to complex-shaped tall buildings whose plans and constructions have been gradually on the increase, this study was aimed to analyze their structural behaviors during construction by applications of construction sequences analyses to prototype models. For twisted tall buildings, total 18 models of with three conditions of a lateral load-resisting system, a twisting angle, and a construction method were selected. A diagrid system and a braced tube system were applied as a lateral load-resisting system. For each lateral load-resisting system, three types of plan with $0^{\circ}$, $1^{\circ}$, and $2^{\circ}$ twisting angles and three construction methods with construction sequences of exterior tube and interior frame were assumed. The structural performances of tall buildings under constructions were analyzed with results of lateral displacements from construction sequence analyses. Also, construction performances of the construction period and the maximum lift weight were compared.
비틀림 형상을 갖는 철골조 초고층 건물의 시공 중 구조거동 분석
최미미(Choe, Mi-Mi),김재요(Kim, Jea-Yo),엄태성(Eom, Tae-Sung) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.12
This study presents the analysis procedure and results for the structural performances of twisted tall buildings under construction. Six sample models of 60-story twisted steel structure in diagrid system or braced tube system were selected, and design load requirements during construction for the buildings were analyzed. At construction stages of 20 stories completion and 40 stories completion, the structural behaviors for wind and seismic loads were presented and compared with those of completed buildings. Also, for load combinations of gravity loads, seismic loads, and wind loads, the design loads of structural members were calculated, and design strength ratios at construction stages and after completion were compared. The analyzed results may be used as guidelines for structural design or construction planning.
시공 및 설계조건을 고려한 플랫 플레이트의 장단기 처짐 분석
최미미(Choe Mi-Mi),최승민(Choi Seung-Min),엄태성(Eom Tae-Sung),김재요(Kim Jea-Yo) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.8
The structural design or construction plan of RC flat plates may be governed by serviceability conditions. Specially, since over-loading and tensile cracking in early-aged slabs significantly decrease the serviceability of a flat plate system under construction, construction conditions and their impacts on the slab deflections may be decisive factors in planning flat plate systems. In this study, the parametric study for short and long-term deflections of flat plates was performed. For various design and construction conditions of the number of shore floors, a slab construction cycle, a distance among shores, a section area of shore, a concrete strength, a compressive reinforcement ratio, a tensile reinforcement ratio, and a slab thickness, the construction loads were calculated by considering shore stiffness and concrete cracking as well as slab stiffness and construction steps, and then the immediate deflections at construction stages and long-term deflections at service stages were calculated. The effects of each design or construction condition on the control of short and long-term deflections were analyzed.
논문 : 대전지역 중생대 화강암 암반 내 취성파괴 예측연구
장현식 ( Hyun Sic Jang ),최미미 ( Mi Mi Choe ),배대석 ( Dae Seok Bae ),김건영 ( Geon Young Kim ),장보 ( Bo An Jang ) 대한지질공학회 2015 지질공학 Vol.25 No.3
대전지역 중생대 화강암 암반을 대상으로 경험적 해석과 수치해석 모델링을 사용하여 심도에 따른 취성파괴 예측 연구를 수행하였다. 먼저 손상제어시험 등의 실내시험으로 경험적 해석과 수치해석 모델링에 필요한 입력 변수를 측정하였고, 측정결과를 바탕으로 연구지역의 암반을 경암에 속하는 그룹 A와 극경암에 속하는 그룹 B로 구분하여 각 그룹별 대표 물성치를 사용하였다. 취성파괴의 해석에는 해석구간의 심도와 측압계수(k)로 결정되는 원위치응력 값이 필요하나 연구지역의 원위치응력 값은 측정되지 않았다. 그러므로 다양한 원위치응력 상태를 고려하기 위하여 3가지의 측압계수 (k=1,2,3)를 분석에 적용하였다. 경험적 해석과 수치해석 모델링에서 측압계수가 1일 경우, 연구지역의 암반에서는 1000m의 심도까지도 취성파괴가 발생할 가능성이 매우 낮은 것으로 분석되었다. 그러나 측압계수가 2일 경우에는 심도 800 m 구간에서부터, 측압계수가 3일 경우에는 심도 600m 구간에서부터 취성파괴가 발생될 가능성이 높을 것으로 판단된다. 이 연구에서는 점착력약화-마찰각강화(CWFS) 모델과 Mohr-Coulomb 모델이 사용되었으며, CWFS 모델은 암반의 취성 파괴영역의 범위와 깊이를 잘 모사하였으나 모아-쿨롱 모델은 이러한 변화를 구현하지 못하였다. Brittle failure of Mesozoic granite in the Daejeon region is predicted using empirical analysis and numerical modeling techniques. The input parameters selected for these techniques were based on the results of laboratory tests, including damage-controlled tests. Rock masses that were considered to be strong during laboratory testing were assigned to “group A” and those considered to be extremely strong were assigned to “group B”. The properties of each group were then used in the analyses. In-situ stress measurements, or the ratio of horizontal to vertical stress (k), were also necessary for the analyses, but no such measurements have been made in the study area. Therefore, k values of 1, 2, and 3 were assumed. In the case of k=1, empirical analysis and numerical modeling show no indication of brittle failure from the surface to1000 m depth. When k=2, brittle failure of the rock mass occurs at depths below 800 m. For k=3, brittle failure occurs at depths below 600 m. Although both the Cohesion Weakening Friction Strengthening (CWFS) and Mohr-Coulomb models were used to predict brittle failure, only the CWFS model performed well in simulating the range and depth of the brittle failure zone.