• 한국강구조학회 논문집
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• 제16권2호통권69호
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• pp.275-284
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• 2004

기둥-보 약축 접합 디테일 개발을 위해서 접합부의 거동을 파악하는 것이 선행되어야한다. 약축 접합부의 형식에 따른 강축 접합부의 거동을 파악하기위하여 기존 브라켓타입 용접접합부의 각 요소들 즉 패널존, 수평스티프너의 유무 및 위치를 변수로 고려하였다. 본 연구에서는 접합부에 수평스티프너가 있는 경우는 접합부를 수직스티프너로 보강한 단순보로 치환하여 접합부의 내력을 산정하였으며, 수평스티프너가 없는 경우는 기둥플랜지의 국부휨강도, 기둥 웨브의 국부인장강도, 기둥 웨브의 크립플링강도 및 기둥웨브의 최대 좌굴강도를 고려한 내력 평가식을 사용하였고 이론해석결과와 실험결과를 비교 분석하였다.

• Steel and Composite Structures
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• 제26권1호
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• pp.31-44
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• 2018

This paper reports a novel steel beam-to-column connection suitable for use in the weak axis of I-section column. Monotonic and cyclic loading experimental investigations and numerical analysis of the proposed weak-axis connection were conducted, and the calculation procedure of the beam-column relative rotation angle and plastic rotation angle was developed and described in details. A comparative analysis of mechanical property and steel consumption were employed for the proposed I-section column weak-axis connection and box-section column bending connection. The result showed that no signs of fracturing were observed and the plastic hinge formed reliably in the beam section away from the skin plate under the beam end monotonic loading, and the plastic hinge formed much closer to the skin plate under the beam end cyclic loading. The fracture of welds between diaphragm and skin plate would cause an unstable hysteretic response under the column top horizontal cyclic loading. The proposed weak-axis connection system could not only simplify the design calculation progress when I-section column is adopted in frame structural design but also effectively satisfy the requirements of 'strong joint and weak member', as well as lower steel consumption.

• 한국강구조학회 논문집
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• 제16권1호통권68호
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• pp.169-180
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• 2004

강구조 기둥-보 접합부에 대한 연구는 그동안 국내외에서 오랜 기간 연구가 진행되어 내진성능 및 집합부의 강도를 개선시킬 수 있는 많은 접합 디테일이 개발되어 사용 중에 있으나, 현재 국내에서는 시공성을 고려하여 기존의 브라켓 형식의 접합부를 선호하고 있다. 본 연구에서는 약축 접합부의 연성적인 거동을 확보하면서 시공이 편리한 기둥-보 접합부를 실험과 이론해석을 통해 개발함으로써 철골구조시스템이 중저층 건물에도 사용할 수 있도록 하는데 그 목적이 있다. 또한 약축에 대한 기둥-보 접합부의 구조설계 및 시공에 필요한 기초 자료를 제시하고자 한다.

• 한국강구조학회 논문집
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• 제16권5호통권72호
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• pp.641-652
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• 2004

철골 기둥-보 강축 접합부에 대한 연구는 그 동안 국내외에서 오랜 기간 연구가 진행되어 내진성능 및 접합부의 강도를 개선시킬 수 있는 많은 접합 형식이 개발되어 사용 중에 있으나, 약축 접합 형식에 대한 연구는 거의 없는 실정이다. 또한 현재 국내에서는 시공성을 고려하여 기존의 브라켓형식 용접 접합부를 선호하고 있으나, 용접량이 많아 취성적인 거동이 우려되며 과대 설계된 경향이 있다. 본 연구의 실험 결과에서 기존 브라켓 형식 용접접합은 용접량이 과도한 것으로 나타났으며, 기둥 웨브와 보의 웨브의 용접은 불필요한 것으로 판단된다. 그리고 본 연구에서 제안한 새로운 기둥-보 약축 접합형식들에 대한 실험 결과에서 기존 브라켓형식 용접접합보다 우수한 내력 및 연성을 보유하여 구조적으로 안전함을 확인할 수 있었다.

• Steel and Composite Structures
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• 제27권3호
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• pp.337-353
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• 2018

In previous weak-axis moment connection tests, brittle fracture always initiated near the edge of the beam flange groove weld due to force flow towards the stiffer column flanges, which is the opposite pattern as strong-axis moment connections. As part of the China NSFC (51278061) study, this paper tested two full-scale novel weak-axis reduced beam section moment connections, including one exterior frame connection specimen SJ-1 under beam end monotonic loading and one interior frame joint specimen SJ-2 under column top cyclic loading. Test results showed that these two specimens were able to satisfy the demands of FEMA-267 (1995) or ANSI/AISC 341-10 (2010) without experiencing brittle fracture. A parametric analysis using the finite element software ABAQUS was carried out to better understand the cyclic performance of the novel weak-axis reduced beam section moment connections, and the influence of the distance between skin plate and reduced beam section, a, the length of the reduced beam section, b, and the cutting depth of the reduced beam section, c, on the cyclic performance was analyzed. It was found that increasing three parametric values reasonably is beneficial to forming beam plastic hinges, and increasing the parameter a is conducive to reducing stress concentration of beam flange groove welds while increasing the parameters b and c can only reduce the peak stress of beam flange groove welds. The rules recommended by FEMA350 (2000) are suitable for designing the proposed weak-axis RBS moment connection, and a proven calculation formulation is given to determine the thickness of skin plate, the key components in the proposed weak-axis connections. Based on the experimental and numerical results, a design procedure for the proposed weak-axis RBS moment connections was developed.

• 대한건축학회논문집:구조계
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• 제34권12호
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• pp.11-20
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• 2018

The purpose of this study is to investigate the seismic performance of exposed column-base plate strong-axis connections for small-sized steel buildings. Even though the seismic design for small-sized buildings became mandatory since Dec.2017, the arbitrary connection details in steel structure have been applied at the construction site, which is considered to be very insufficient to secure structural safety and stability considering the increased seismic risk. Therefore, a series of experimental test programs had been carried out to develop enhanced connection details in order to ensue the adequate seismic safety of small buildings. The hysteretic behavior of the exposed column-base plate connections commonly used in Korea seem to be very pure poor due to the "Rocking" phenomena between anchor plate and concrete by the residual plastic deformation of anchor bolts. A series of hysteretic tests were conducted to find the solution to overcome the "Rocking" phenomena of the exposed column-base plate connections, finally the stable seismic behavior was obtained by uisng at least 8 anchor bolts with good bonding strength to the protptype specimen.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1999년도 가을 학술발표회 논문집
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• pp.403-410
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• 1999

General1y, H-section is used for columns and beams in the middle and low steel building, But it has a strong and weak axis. Thus if H-section is used for columns, the structure needs reinforcement on the weak axis. Therefore recently, square holler section(S.H.S) is used for columns because it is able to coiler the vulnerability of H-section. Structural analysis is usually executed under the assumption that connections are either ideally pinned joint or fully rigid joint. Actually all connections are semi-rigid which possess a rotational stiffness. Therefore it can be designed economically as using the property of connections which has a rotational stiffness. This paper presents a prediction model curve which is fitted Kishi-Chen power Model about the behavior of connection between H-beam and S.H.S column. Non-linear analysis program was considered the non-linearity of semi-rigid connection and the geometrical non-linearity under the effect of axial force. It was programed by FORTRAN90 and Visual Basic.

• 한국강구조학회 논문집
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• 제20권4호
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• pp.483-491
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• 2008

1994년 노스리지 지진 이후, 철골모멘트골조 강축방향 접합부의 내진성능 평가에 관한 연구가 국내 외에서 활발하게 진행되어온 반면, 국내 철골모멘트골조 내진설계 및 시공의 실무에 관행적으로 적용되고 있는 철골모멘트골조 약축방향 접합부의 내진성능 평가 연구가 국내는 물론 국외에서도 그 사례를 찾아보기 힘든 상황이다. 따라서 본 연구에서는 국내에서 내진성능 확보 여부가 확인되지 않은 상태에서 내진설계 실무에서 가장 많이 사용되고 있는 브라켓 형식 및 WUF-B 형식의 접합상세를 갖는 철골모멘트골조 약축접합부의 실물대(Full scale) 실험체를 제작 및 실험하여 이와 같은 형상의 접합부에 대한 내진성능을 평가하여 향후 이와 같은 형상을 갖는 철골모멘트골조 약축접합부의 설계를 위한 기초자료를 제공하는 것을 목적으로 한다. 이러한 목적을 달성하기 위하여, 현장조사 및 설계도서등의 기존 자료를 통해 총 2개의 실험체를 제작하여 내진성능을 평가 실험연구를 수행하였다. 실험결과로부터 최대내력 비교, 하중-변위 이력 및 응력도 등에 대한 거동을 비교 분석 하였다. 실험결과 층간변위각 5%의 BR-W 실험체가 층간변위각 4%를 갖는 WUF-B 실험체에 비해 우수한 구조적 거동을 보여주었으며, 설계 내력을 상회하는 내력을 보유하고 있는 것을 알 수 있었다. 또한 브라켓 형식의 실험체는 최대내력 도달 이후 완만한 강도 저하를 나타내었으나, WUF-B 형식의 실험체는 최대내력 도달 이후 급격한 하중 저하를 나타내며 취성적인 거동을 보였다.

• Structural Engineering and Mechanics
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• 제57권3호
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• pp.507-528
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• 2016

Reduced beam section (RBS) moment resisting connections are among the most economical and practical rigid steel connections developed in the aftermath of the 1994 Northridge and the 1995 Kobe earthquakes. Although the performance of RBS connection has been widely studied, this connection has not been subject to in the skewed conditions. In this study, the seismic performance of dogbone connection was investigated at different angles. The Commercial ABAQUS software was used to simulate the samples. The numerical results are first compared with experimental results to verify the accuracy. Nonlinear static analysis with von Mises yield criterion materials and the finite elements method were used to analyze the behavior of the samples The selected Hardening Strain of materials at cyclic loading and monotonic loading were kinematics and isotropic respectively The results show that in addition to reverse twisting of columns, change in beam angle relative to the central axis of the column has little impact on hysteresis response of samples. Any increase in the angle, leads to increased non-elastic resistance. As for Weak panel zone, with increase of the angle between the beam and the column, the initial submission will take place at a later time and at a larger rotation angle in the panel zone and this represents reduced amount of perpendicular force exerted on the column flange. In balanced and strong panel zones, with increase in the angle between the beam and the central axis of the column, the reduced beam section (RBS), reaches the failure limit faster and at a lower rotation angle. In connection of skewed beam, balanced panel zone, due to its good performance in disposition of plasticity process away from connection points and high energy absorption, is the best choice for panel zone. The ratio of maximum moment developed on the column was found to be within 0.84 to 1 plastic anchor point, which shows prevention of brittle fracture in connections.

• Journal of the korean society of oceanography
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• 제35권1호
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• pp.1-10
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• 2000

A two-dimensional numerical model was applied to investigate the sediment transport and sand bank formation in a macrotidal sea, the Kyunggi and Asan Bays. The tidal residual currents show quite complex pattern including counter-rotating eddies off the northwestern corner of the Dugjeok Island that reflect the promontory effect. Complex residual eddies are also present off the coast of the Taeanbando and in the Asan Bay. Net sediment transport pattern shows that sandy sediments in the Kyunggi and Asan Bays are generally transported landward from the outer sea suggesting sediment trapping inside the bays. This phenomenon may be related to the formation and maintenance of numerous sand banks in this macrotidal sea. Alternate occurrences of deposition and erosion predicted from the numerical model along the coast of the Taeanbando with strong deposition on the southwestern part of the 'Jangansatoe'(JSB), a large sand ridge off the coast of the Taeanbando appear to reflect the loose connection of JSB, The 'Joongangcheontoe', a central sand bank (CSB) with the main axis in the NW-SE direction in the Asan Bay may undergo a modification with strong deposition along the northeastern flank. These results indicate that the sand banks are actively modified and maintained by the strong tidal currents in this shallow macrotidal sea.