• 한국강구조학회 논문집
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• 제23권5호
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• pp.615-627
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• 2011

강구조에서 약축에 대한 접합기술 및 연구는 소수의 연구자들에 의해 진행되고 있으며, 연구실적 및 접합부 기술발전의 성과가 많이 부족한 실정이다. 기존 브라켓타입의 약축접합부는 효율적인 시공성 및 $CO_2$배출량의 저감을 위하여 개선될 필요가 있으며, 구조성능이 우수하고 $CO_2$배출량이 적은 새로운 형태의 약축접합부로 대체되어야 할 것이다. 그러나 새로운 형태의 약축접합부는 구조성능의 검증 및 안전성에 대한 검토가 선행되어야 하며, $CO_2$저감에 관한 연구가 진행되어야 할 것으로 판단된다. 따라서 본 연구는 기존 브라켓타입의 약축접합부, 표준약축접합부 및 초간편 약축접합부를 대상으로 구조성능을 검토하였으며, 약축접합에 필요한 접합재료의 소요수량 및 $CO_2$배출량을 정량적으로 평가하였다. 그 결과, 초간편 약축접합부가 구조성능이 우수하고, $CO_2$배출량도 적으며, 접합재료의 소요수량이 적기 때문에 시공성이 우수하여 기존 브라켓타입의 약축접합부를 대체할 수 있을 것으로 판단된다.

• Structural Engineering and Mechanics
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• 제68권5호
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• pp.591-601
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• 2018

Non-moment beam-to-column connections, which are usually referred to as simple or shear connections, are typically designed to carry only gravity loads in the form of vertical shears. Although in the analysis of structures these connections are usually assumed to be pinned, they may provide a small amount of rotational stiffness due to the typical connection details. This paper investigates the effects of this small rotational restraint of simple beam-to-column connections on the behavior and seismic response of steel braced non-moment resisting frames. Two types of commonly used simple connections with bolted angles, i.e., the Double Web angle Connection (DWC) and Unstiffened Seat angle Connection (USC) are considered for this purpose. In addition to the pinned condition - as a simplified representation of these connections - more accurate semi-rigid models are established and then applied to some frame models subjected to nonlinear pushover and nonlinear time history analyses. Although the use of bracing elements generally reduces the sensitivity of the global structural response to the behavior of connections, the obtained results indicate considerable effects on the local responses. Namely, our results show that consideration of the real behavior of connections is essential in designing the column elements where the pin-connection assumption significantly underestimates design of outer columns of upper stories.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 지반공학 공동 학술발표회
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• pp.336-343
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• 2005

In the braced excavations, careful consideration must be given to the risks of progressive collapse of the entire support system due to failure of a single member. The existing connection methods of the excavation support system results in many problems during construction. To overcome these, simple joint method is proposed in this study. The full scale test and the numerical analysis using finite element method were performed to verify the safety of them. As results, simple joint method was good effective to increase strength. And it was good effective to decrease in numbers of bolt. Also, new method is cheaper than existing connection methods and a good construction as well.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2005년도 학술발표회 논문집
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• pp.244-251
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• 2005

The aim of this paper is to evaluate the connection resistance for the rigid connection, semi-rigid connection and simple connection by LRFD and ASD codes. This paper found the resistable stress for various connections with eccentricity. The paper suggested a amended connection pattern to get rid of deficits caused from the eccentricity.

• Steel and Composite Structures
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• 제28권3호
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• pp.309-318
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• 2018

Buckling Restrained Braced (BRB) frames have been widely used as an efficient seismic load resisting system in recent years mostly due to their symmetric and stable hysteretic behavior and significant energy dissipation capacity. In this study, to provide a better understanding of the behavior of BRB frames with various beam-column connections, a numerical study using non-linear finite element (FE) analysis is conducted. All models are implemented in the Abaqus software package following an explicit formulation. Initially, the results of the FE model are verified with experimental data. Then, diverse beam-column connections are modeled for the sake of comparison from the shear capacity, energy dissipation and frame hysteresis behavior points of view until appropriate performance is assessed. The considered connections are divided into three different categories: (1) simple beam-column connections including connection by web angle and connection by seat angle; (2) semi-rigid connection including connection by web and seat angles; and (3) rigid beam-column connections by upper-lower beam plates and beam connections with web and flange splices. Results of the non-linear FE analyses show that these types of beam-column connections have little effect on the maximum story drift and shear capacity of BRB frames. However, the connection type has a significant effect on the amount of energy dissipation and hysteresis behavior of BRB frames. Also, changes in length and thickness of the angles in simple and semi-rigid connections and changes in length and thickness of plates in rigid connections have slight effects (less than 4%) on the overall frame behavior.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2001년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 2001
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• pp.295-301
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• 2001

For the seismic analysis of typical roadway bridges provisions are given in most codes for analysis models, which describes however only fundamental modelling methods according to the basic theories of structural dynamics. In practice even conventional non-seismic analysis models, separate super- and substructure models, are applied, which are not adequate because of neglecting connection elements. In this study three typical roadway bridges, a Steel box bridge, a PC beam bridge and a PC box bridge are selected and simple models integrating super- and substructure as well as connection elements are given. The simple models are composed with frame elements with lumped masses representing stiffness and mass characteristics of the selected bridges. To check the properness of the simple models, analysis results with the simple models are compared with those obtained with detailed models in view of bridge failure mechanisms. It is proved that the simple models can be used in the preliminary design phase fur the determination of failure mechanisms of typical roadway bridges.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
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• pp.85-88
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• 2004

In this study, a simple moment-resisting precast concrete beam-column connection is proposed for highly seismic zone using dywidag ductile rod [DDC]. DDC is superior system for ductility, energy dissipation capacity, connection strength, and drift capacity. A study was carried out to investigate the connection behavior subjected to cyclic inelastic loading. Four Precast beam-column interior connections and one monolithic connection will be tested. The variables will be examined were the strength relationship between joint's ductile rod and beam reinforcement for gain energy dissipation capacity. The specimens will be tested only reverse cyclic loading in accordance with a prescribed displacement history. Connection performance is evaluated on the basis of ductility, energy dissipation capacity, connection strength, and drift capacity. the precast connection using DDC is capable of matching of exceeding the performance of the monolithic connection and thereby provides moment-resisting behavior.

• 과학교육연구지
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• 제38권2호
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• pp.331-343
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• 2014

전지의 연결방법에 따른 전류의 특성에 대한 초등교사들의 오개념 유형과 그 일관성에 대하여 조사되었다. 초등교사들의 전지의 연결방법에 따른 전류의 특성에 대한 오개념은 3가지 유형으로 나타났다. 14명의 초등교사들을 대상으로 한 이 연구에서, 전지들의 직렬연결과 병렬연결시 전류의 특성을 연결하는 전지의 수에 초점을 맞추는 유형에는 2명의 초등교사가, 전지의 직렬연결에 대한 개념과 병렬연결에 대한 개념을 혼동하는 유형에는 8명의 초등교사가, 그리고 전지의 직렬연결과 병렬연결에 대한 개념을 저항의 직렬연결과 병렬연결에 대한 개념으로 혼동하는 유형에는 4명의 초등교사가 분포하였다. 초등교사들은 전지의 연결에 대한 학습개념이 적용되는 상황에서 뿐만 아니라 분화개념이 적용되어야 하는 상황에서도 그들의 오개념 유형을 일관성 있게 적용하고 있었다.

• Computers and Concrete
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• 제23권3호
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• pp.203-215
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• 2019

Precast reinforced concrete structure (PRCS) consists of prefabricated members assembled at worksites and has more connections limitations in comparison with the equivalent in-situ reinforced concrete structure (IRCS). As a result of these limitations, PRCSs have less ductility in comparison with IRCSs. Recent studies indicate that the most noticeable failure in PRCSs have occurred in their connection zone. The objective of this study is introducing a type of precast beam-to-column connection (PBC) which in spite of being simple is of the same efficiency and performance as in-situ beam-to-column connection (IBC). To achieve this, the performance of proposed new PBC at exterior joint of a four story PRCS was analyzed by pseudo dynamic analysis and compared with that of IBC in equivalent IRCS. Results indicated that the proposed connection has even better performance in terms of strength, energy dissipation and stiffness, than that of IBC.

• 한국통신학회논문지
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• 제21권11호
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• pp.2862-2868
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• 1996

본 논문에서는 두계층(이진)의 간단한 적응적(adaptive) 율 제어를 원거리 목적지와 근거리 목적지를 모두 포함하고 있는 멀티캐스트(점-대-다중점) 연결에 적용하는 경우 원거리 및 근거리 경로에서의 성능을 개별적으로 동시에 평가할 수 있는 큐잉 모델을 제시하고 이를 분석하였다. 가정한 율 제어 기법은 점-대-점 연결을 위한 이진 율 제어 기법을 단순하게 멀티캐스트 연결에 적용한 것이다. 원거리 및 근거리 목적지에서의 개별적인 셀 손실율을 효율적으로 계산할 수 있는 방법을 개발하였고 이 방법을 사용하여 수치적 결과를 얻어 본 결과, 같은 거리의 경로만으로 이루어지는 멀티캐스트 연결에 적용할 경우 공정한 율 제어 방법이, 경로 별 거리차가 있는 멀티 캐스트 연결에 대해서는 원거리 경로가 근거리 경로에 비하여 불리한 대우를 받는 불공정성을 드러냄을 볼 수 있었다.