• 한국강구조학회 논문집
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• 제24권5호
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• pp.559-569
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• 2012

기존 임시교량은 대부분 거더의 횡-비틀림좌굴을 방지하고 시공의 효율성을 확보하기 위해 가로보를 설치하고 있다. 이 가로보는 볼트로 연결되며, 중력방향 하중에 대한 저항성능이 매우 작은 것으로 평가되고 있다. 그러나 최근 일체화된 가로보를 사용함으로써 가로보를 하중저항요소로 이용한 임시교량이 최근 개발된 바 있다. 이 연구는 새롭게 개발된 임시교량에 대한 구조적 거동 및 하중전달능력을 실험 및 구조해석 등을 통해 조사, 분석하였다. 일체로 연속된 가로보를 이용한 임시교량은 가로보의 휨강성을 통해 하중을 인접거더로 분산하여 거더에 발생하는 최대휨응력을 감소시키고, 거더의 휨강성을 증대시키는 것으로 확인되어 장경간 임시교량에서도 유리할 것으로 판단된다.

• 한국구조물진단유지관리공학회 논문집
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• 제12권5호
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• pp.74-80
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• 2008

본 논문은 기둥형상비를 실험 변수로 가지는 무량판 슬래브-기둥 접합부의 내진성능을 평가하는데 있다. 본 연구에서는 무량판 슬래브의 뚫림 전단파괴를 방지하기 위하여 본 연구와 병행하여 진행된 연구에서 개발된 연속 절곡된 전단보강근을 적용하였다. 기둥형상비에 따른 실험체는 각각 FIS1-05(0.5), FIS1- 10(1.0), FIS1-20(2.0) 이다. 실험체의 수평방향으로 정적 수평하중을 가력 하였으며, 중력하중비에 의한 일정 수직 하중을 적용하였다. 실험결과는 슬래브-기둥 접합부의 수평 변위 및 강도를 기준으로 평가하였다. 분석결과, FIS1-05, FIS1-20와 같은 장방형 기둥을 갖는 접합부의 성능이 FIS1-10와 같은 정방형 기둥을 갖는 접합부보다 우수한 것으로 평가되었다.

• Steel and Composite Structures
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• 제45권3호
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• pp.437-454
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• 2022

Elliptic-braced simple resisting frame as a new lateral bracing system installed in the middle bay of frame in building facades has been recently introduced. This system not only creates a problem for opening space from the architectural viewpoint but also improves the structural behavior. Despite the researches on the seismic performance of lateral bracing systems, there are few studies performed on the effect of the stiffness parameters on the elastic story drift and calculation of period in simple braced steel frames. To overcome this shortcoming, in this paper, for the first time, an analytical solution is presented for calculating elastic lateral stiffness in a simple steel frame equipped with elliptic brace subjected to lateral load. In addition, for the first time, in this study, a precise formulation has been developed to evaluate the elastic stiffness variation in a steel frame equipped with a two-dimensional single-story single-span elliptic brace using strain energy and Castigliano's theorem. Thus, all the effective factors, including axial and shear loads as well as bending moments of elliptic brace could be considered. At the end of the analysis, the lateral stiffness can be calculated by an improved and innovative relation through the energy method based on the geometrical properties of the employed sections and specification of the used material. Also, an equivalent element of an elliptic brace was presented for the ease of modeling and use in linear designs. Application of the proposed relation have been verified through a variety of examples in OpenSees software. Based on the results, the error percentage between the elastic stiffness derived from the developed equations and the numerical analyses of finite element models was very low and negligible.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
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• pp.223-226
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• 2005

The purpose of this study is to discuss how strength and ductility of each system in low-rise R/C buildings combined with extremely brittle, shear and flexural failure systems have influence on seismic capacities of the overall system, which is based on seismic response analysis of SDOF structural systems. To simulate the triple lateral-load resisting system, structures are idealized as a parallel combination of two modified origin-oriented hysteretic models and degrading trilinear hysteretic model that fail primarily in extremely brittle, shear and flexure, respectively. Stiffness properties of three models are varied in terms of story shear coefficients, and structures are subjected to two ground motion components. By analyzing these systems, interaction curves of required strengths of the triple systems for various levels of ductility factors are finally derived for practical purposes.

• Wind and Structures
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• 제12권2호
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• pp.89-101
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• 2009

The Monte Carlo procedure was used to simulate wind load effects on a light-frame low-rise structure of irregular shape and a main wind force resisting system. Two analytical models were studied: rigid-beam and rigid-plate models. The models assumed that roof diaphragms were rigid beam or rigid plate and shear walls controlled system behavior and failure. The parameters defining wall stiffness, including imperfections, were random and included wall stiffness, wall capacity and yield displacements. The effect of openings was included in the simulation via a set of discrete multipliers with uniform distribution. One and two-story buildings were analyzed and the models can be expanded into multiple-floor structures provided that the assumptions made in this paper are not violated.

• 한국구조물진단유지관리공학회 논문집
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• 제10권3호
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• pp.211-218
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• 2006

본 연구에서는 거주형 무량판 구조의 뚫림 전단을 방지하기 위한 연속 절곡된 전단 보강근을 개발하였다. 이를 적용한 슬래브-기둥 접합부에 있어 개발 전단 보강근의 뚫림 전단 성능을 평가하기 위하여, 구조 성능 실험을 수행하였다. 실험 변수는 전단보강근이 없는 경우, 개발 전단보강근을 사용한 경우, 헤드 스터드를 사용한 경우이다. 수평하중에 대한 저항성능을 평가하기 위하여 일정축력하에서의 이력 하중 실험을 수행하였다. 실험결과는 전체 변위 및 접합부 강도 등으로 평가되었다. 이러한 결과로부터, 개발된 전단보강근이 층간변위비 거동에 있어 우수한 성능을 보유함을 확인할 수 있었다.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2000년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 2000
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• pp.314-321
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• 2000

Excessive torsional behavior of asymmetric building structures is observed to be the main cause of the poor seismic performance. Concepts of current design provisions for torsion are based on the assumption that the strength of the lateral load resisting elements can be adjusted without changing their stiffness. This paper investigates inelastic torsional effects of multi-story high rise residential building in Korea on increase of strength demand and ductility of members using some methods published in literature. The methods analyze the reduction of strength and member ductility resulting from torsional mechanisms. This study shows that use of these concepts control inelastic torsion during preliminary seismic design of multi-story building of irregular plans.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2005년도 춘계 학술발표회 논문집
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• pp.375-382
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• 2005

In this paper, a practical control method of wind-induced vibration of high-rise buildings is presented in the form of resizing algorithm. In the structural design process for high-rise buildings, the lateral load resisting system for the building is more often determined by serviceability design criteria including wind-induced vibration level. Even though many drift method have been developed in various forms, no practical design method for wind induced vibration has been developed so far. Structural engineers rely upon heuristic or experience in designing wind induced vibration. The performance of the proposed method is evaluated by comparing wind-induced vibration levels estimated both from approximate techniques and wind tunnel test.

• Steel and Composite Structures
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• 제18권3호
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• pp.711-737
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• 2015

Steel Plate Shear Walls (SPSWs) have been accepted widely as an effective lateral load resisting system. For seismic performance evaluation of a multi-story building with SPSWs, detailed finite element models or a strip model can be used to represent the SPSW components. However, such models often require significant effort for tall or medium height buildings. In order to simplify the analysis process, discrete elements for the framing members can be used. This paper presents development of a simplified equivalent braced model to study the behavior of the SPSWs. The proposed model is expected to facilitate a simplification to the structural modeling of large buildings with SPSWs in order to evaluate the seismic performance using regular structural analysis tools. It is observed that the proposed model can capture the global behavior of the structures quite accurately and potentially aid in the performance-based seismic design of SPSW buildings.

• 한국전산구조공학회논문집
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• 제23권1호
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• pp.111-119
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• 2010

여러 연구자들에 의해 최적화 알고리즘을 이용한 최적내진설계에 관한 연구가 컴퓨터의 발달과 더불어 활발히 이루어져 왔다. 하지만 지금까지의 최적내진설계에 관한 연구는 대부분 모멘트저항골조를 대상구조물로 한 연구였다. 가새골조는 모멘트저항골조와 더불어 대표적인 횡력저항시스템이기 때문에 가새골조의 최적내진설계기법 개발을 통해 경제적이며 효율적인 설계가이드라인을 제시할 수 있다면 실무에 미치는 파급효과는 클 것이라 판단된다. 본 논문에서는 가새의 좌굴을 고려한 역V형 특수중심가새골조의 최적내진설계 알고리즘을 제안하고자 한다. 제안된 알고리즘은 구조물의 물량과 에너지 소산량을 목적함수로 설정하고, 강도조건 및 층간변위 조건등의 제약조건으로 설정한다. 알고리즘의 검증을 위해 2D 3층, 9층 역V형 특수중심가새골조 예제를 적용한다.