에너지 기반 근사해석을 이용한 철골모멘트골조의 연쇄붕괴 민감도 평가방법

노삼영,박기환,이상윤,Noh, Sam-Young,Park, Ki-Hwan,Lee, Sang-Yun 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 논문집 Vol.21 No.5

본 연구는 연쇄붕괴 저항성능 평가 시 기둥의 순간적인 제거에 따른 동적효과가 반영된 에너지 기반 근사해석의 적용성을 확인하기 위해 내진 설계된 철골모멘트골조의 예제구조물을 대상으로 분석하였으며, 이를 통해 구조 강건성을 산정하여 연쇄붕괴에 대한 민감도를 평가할 수 있는 방법을 제시하였다. 예제구조물에 대한 적용을 통해 비선형 정적해석 결과를 이용한 에너지 기반 근사해석과 직접동적해석에 대한 결과가 잘 일치하는 것을 검증하였으며, 다른 구조시스템을 가지는 건물의 연쇄붕괴에 대한 구조적 내력성능을 비교하기 위한 수단으로 구조물의 민감도를 평가하였다. 이는 비정상하중에 대하여 구조물이 연쇄붕괴에 저항할 수 있는 최대보유 잔류내력 성능인 구조 강건성을 이용하였고, 본 연구에서 제시한 방법을 통해 연쇄붕괴 해석 및 설계에 편리하게 활용될 수 있음을 확인하였다. In this study, the prototype structure of seismically designed steel moment frame was analyzed statically and dynamically in order to demonstrate the applicability of energy-based approximate analysis with the dynamic effect of sudden column loss in the evaluation of the collapse resistance and a method for assessing the sensitivity to progressive collapse was proposed. For the purpose of comparing the structural behavior of buildings with different structural systems, the sensitivity of the structure to the sudden removal of vertical members can be used as a significant measure. The energy-based approximate analysis prediction for the prototype structure considered in the study showed good agreement with the dynamic analysis result. In the sensitivity evaluation, the structural robustness index that indicates the ability of a structure to resist collapse induced by abnormal loads was used. It was confirmed that the proposed methods can be used conveniently and rationally in progressive collapse analysis and design.

선형 전산해석을 이용한 자연 습식 냉각탑의 기하형상에 대한 평가

노삼영,이상윤,허동현,Noh, Sam-Young,Lee, Sang-Yun,Heo, Dong-Hyun 한국공간구조학회 2012 한국공간구조학회지 Vol.12 No.3

하이퍼볼릭 쉘로 구성된 냉각탑에서 쉘의 형상은 풍하중에 대하여 냉각탑 전체의 동적 거동에 민감하게 응답한다. 이에 따라 냉각탑 설계 시 기하형상의 결정은 매우 중요하며 일반적으로 고유진동수를 기반으로 하여 산정한다. 본 연구의 목적은 냉각탑 쉘의 구조적 거동에서 형상변수가 미치는 영향을 파악하고자 한다. 기존의 냉각탑 형상변수를 변화시켜 32개의 모델을 선정하였고 이를 1차 고유진동수를 기반으로 하여 분석한 후, 3개의 대표적인 형상을 선택하여 선형 해석을 수행하였다. 그 결과, 전체적으로 작은 반지름을 가지는 기하형상이 높은 1차 고유진동수를 나타내고 풍하중에 대하여 덜 민감한 시스템이 되는 것을 알 수 있었다. In the design procedure of the cooling tower the form-finding of the shell is the most important process, because the shape of the shell determines the sensitivity of dynamic behaviour of the whole tower against wind excitation. In engineering practice, geometric parameters of the shell are generally determined based on natural frequency analysis. 32 cooling tower shell geometries were selected through variation of the geometric parameters of an existing cooling tower shell. They were evaluated based on the first natural frequency. From the result three representative cooling towers are selected for the analysis of the structural behaviour by means of linear FE-method. As a result, a hyperbolic rotational shell with the small radius overall will yield the shell geometry with a higher first natural frequency and thus a wind-insensitive structure.

Half-PC 보와 현장타설 콘크리트의 경계면에 배근된 비인장 강연선의 부착응력-슬립 모델 및 정착길이

노삼영,김형근,이준호,조민주,Noh, Sam-Young,Kim, Hyung-Geun,Lee, Jun-Ho,Jo, Min-Joo 대한건축학회 2012 대한건축학회논문집 Vol.28 No.3

The purpose of this research is to obtain development length and bond slip relationship of the untensioned wire strand, applied to the precast concrete beam-column joint system developed recently. For this the pull-out tests were performed, in which the main test parameters are diameter of strands (9.3mm, 12.7mm, bundle), embedment length and distance from the precast concrete surface to the strand. A estimation equation of the development length was proposed based on test result. Herein 5% fractil value with 90% reliability was considered. The development length estimated by the proposed equation is comparable with that of the untensioned wire strand suggested in CEP-FIP Model Code 1990. Half-Precast concrete and topping concrete interface was proposed as an additional new bond condition for the strand location coefficient in the equation of MC-90. Additionally a bond stress-slip model was established by means of a numerical algorithm applying the strand strain obtained from the pullout tests mentioned above. The development length obtained by numerical analysis using this bond-slip model agrees with the test result. This shows the validity of the bond-slip model developed in this research.

선형 전산해석을 이용한 자연 습식 냉각탑의 기하형상에 대한 평가

노삼영,이상윤,허동현 한국공간구조학회 2012 한국공간구조학회지 Vol.12 No.3

In the design procedure of the cooling tower the form-finding of the shell is the most important process, because the shape of the shell determines the sensitivity of dynamic behaviour of the whole tower against wind excitation. In engineering practice, geometric parameters of the shell are generally determined based on natural frequency analysis. 32 cooling tower shell geometries were selected through variation of the geometric parameters of an existing cooling tower shell. They were evaluated based on the first natural frequency. From the result three representative cooling towers are selected for the analysis of the structural behaviour by means of linear FE-method. As a result, a hyperbolic rotational shell with the small radius overall will yield the shell geometry with a higher first natural frequency and thus a wind-insensitive structure. 하이퍼볼릭 쉘로 구성된 냉각탑에서 쉘의 형상은 풍하중에 대하여 냉각탑 전체의 동적 거동에 민감하게 응답한다. 이에 따라 냉각탑 설계 시 기하형상의 결정은 매우 중요하며 일반적으로 고유진동수를 기반으로 하여 산정한다. 본 연구의 목적은 냉각탑 쉘의 구조적 거동에서 형상변수가 미치는 영향을 파악하고자 한다. 기존의 냉각탑 형상변수를 변화시켜 32개의 모델을 선정하였고 이를 1차 고유진동수를 기반으로 하여 분석한 후, 3개의 대표적인 형상을 선택하여 선형 해석을 수행하였다. 그 결과, 전체적으로 작은반지름을 가지는 기하형상이 높은 1차 고유진동수를 나타내고 풍하중에 대하여 덜 민감한 시스템이 되는 것을 알 수 있었다.

공동주택 디자인 자유도를 위한 오픈하우징 구조모델

노삼영,손영진,임지택,김호준,이주성 대한건축학회 2017 대한건축학회논문집 Vol.33 No.7

In this study, a reference plane module of the multi-residential building is proposed for applying open housing method. It makes possible to procure a degree of freedom on the elevation design, especially by introducing the Architectural Precast Concrete(APC) panel. A spatial common bay-width was found by analyzing typical spatial units of Korean multi-residential buildings and modularized by a 3-story unit plane. It consists of two mesonnette units and two plane units. The building was classified into three types based on shear wall types and the number of building stories. For each type column sections and concrete strength were analysed, considering the constructability of an efficient formwork system for construction costs. The connection locations between APC and structure were suggested by the stress analysis under the wind load and lifting load. The APC panel with a thickness of 100mm was designed taking into account the self-weight, wind load and lifting load.

원자력 발전소 자연 습식 냉각탑의 기하형상에 따른 구조적 거동에 관한 전산해석 연구

노삼영,이상윤,허동현 한국구조물진단유지관리학회 2012 한국구조물진단학회 학술발표회논문집 Vol.2012 No.1

The shell of form-finding is most important in design procedure of the cooling tower, because the shape of the shell determines the sensitivity of dynamic behavior of the whole tower against wind excitation. The purpose of the study is the investigation of the influences of the geometric parameters of the cooling tower shell on the structural behavior. As a result, a hyperbolic rotational shell with the small radius overall will yield the shell geometry with a higher first natural frequency and thus a wind-insensitive structure. Linearly and nonlinearly numerical analysis are demonstrated influence of the shell-geometric parameters on structural behaviours. The results of this study may be informative for the form-finding of the cooling tower shell.

CIP공법을 개량한 지하 영구벽체의 경제성 분석에 관한 연구

노삼영,김승훈,김갑수,박정태,홍성진 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9

In this research, the economic analysis with the current method of construction which is used like the CIP method+basement wall and slurry wall method as the underground permanent wall in order to evaluate the profitability of PUS was performed. At this time, the structure and construction condition used in the analysis considered the arbitrary environment and With respect to this, each basement wall was designed and the output of resources and construction cost was calculated and it applied to the analysis. At this time, the construction cost classified as the material cost, labor cost, and expenses and analyze.

공동주택의 중량충격원에 의한 진동전달 및 강성보강에 의한진동저감효과 분석

노삼영,윤진호 한국생활환경학회 2007 한국생활환경학회지 Vol.14 No.3

After 1970's many wall-type multi-residential buildings have been constructed to solve the housing problem domestically. However noise and vibration troubles by the floor impact among households in the wall-type multi-residential building became an important issue with the increasing demand of living circumstances. To meet a new measure against this problem induced by the floor impact, vibration characteristics of the wall-type building should be investigated. The purpose of this study is to investigate the ratio of vibration transmission, comparing the experimental results with them of numerical analysis. The experiment was performed in a unit of a 15-stories multi-residential building. The slab of the living room was impacted with a standard bang machine, in which the acceleration response of the slab and the wall was measured. The results of the numerical analysis for a simplified model of a family unit with 100 m2 were compared with them of the experiment. The results showed that the vibration energy is mainly transmitted through the slab and the contribution of wall is not noticeable. Also, the effects of stiffening beam under or on the slab and the alteration of wall cross section area were shown by means of the numerical eigenfrequency analysis.

비긴장강연선과 철근이 혼용된 보의 설계방안

노삼영,조민주,김종성,김승훈 한국구조물진단유지관리공학회 2013 한국구조물진단유지관리공학회 논문집 Vol.17 No.4

A new precast concrete (PC) beam and column connection system using non-prestressed wire strands was recently developed. The system is composed of one unit of two-storied PC-column and PC-beams with U-shaped ends. The connection part of the column and beams is reinforced by deformed bars and non-prestressed wire strands in combination for the improvement of workability. Structural performance of this system was verified by several experimental studies. The purpose of this study is developing a design concept of the beam reinforced by deformed bars and non-prestressed wire strands in combination, in terms of the cross-sectional analysis, based on the preceded experiment. A minimum and maximum reinforcement ratio and the calculation formula for the strength of flexural member reinforced by reinforcements having different yield strengths are derived based on KBC2009. Under consideration existing research results for the application of high strength reinforcement bars, the design yield strength of the non-prestressed wire strand is suggested. An example for the cross section design, satisfying the serviceability requirements, demonstrates the applicability of the design concept developed in the study.

철근콘크리트 보의 유효 단면2차모멘트식의 제안

노삼영,김유리 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9

The KCI and ACI design code adopted Branson’s equation for simple calculation of deflection, in which a representative value of the effective moment of inertia is used for the whole length of a member. However, the effective moment of inertia in design codes are primarily based on the ratio of maximum moment and cracking moment of beam subjected to loading without proper consideration on many other possible influencing factors such as span length, member end condition, sectional size, loading geometry, materials, sectional properties, amount of cracks and its distribution, and ect. In this study, the modified effective moment of inertia is proposed to calculate the deflection of reinforced concrete members. As a result, immediate deflections computed by the proposed equations in this study are closed to the actual deflection.