• Advances in concrete construction
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• 제9권5호
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• pp.437-448
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• 2020

In high rise buildings that utilize precast large panel system for construction, the shear wall provides strength and stiffness during earthquakes. The performance of a wall panel system depends mainly on the type of connection used to transfer the forces from one wall element to another wall element. This paper presents an experimental investigation on different types of construction detailing of the precast wall to wall vertical connections under reverse cyclic loading. One of the commonly used connections in India to connect wall to wall panel is the loop bar connection. Hence for this study, three types of wet connections and one type of dry connection namely: Staggered loop bar connection, Equally spaced loop bar connection, U-Hook connection, and Channel connection respectively were used to connect the precast walls. One third scale model of the wall was used for this study. The main objective of the experimental work is to evaluate the performance of the wall to wall connections in terms of hysteretic behaviour, ultimate load carrying capacity, energy dissipation capacity, stiffness degradation, ductility, viscous damping ratio, and crack pattern. All the connections exhibited similar load carrying capacity. The U-Hook connection exhibited higher ductility and energy dissipation when compared to the other three connections.

• Steel and Composite Structures
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• 제17권5호
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• pp.735-751
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• 2014

Concrete-filled steel tube (CFT) composite columns, either circular (CCFT) or rectangular (RCFT), have many economical and aesthetic advantages but the behavior of their connections are complicated. This study aims to investigate, through an experimental program, the performance and behavior of different connections configurations between circular concrete filled steel tube columns (CCFT) and gusset plates subjected to shear and axial compression loadings. The study included seventeen connection subassemblies consisting of a fixed length steel tube and gusset plate connected to the tube end with different details tested under half cyclic loading. A notable effect was observed on the behavior of the connections due to its detailing changes with respect to capacity, failure mode, ductility, and stress distribution.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
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• pp.619-622
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• 2004

In this study, a moment resisting precast concrete beam-column connection is proposed. An experimental study was carried out to investigate the connection behavior subjected to cyclic loading. Three precast beam-column interior connections and one monolithic connection were tested. Variable included the detailing used at the joint to achieve structural constructability and the location of mild steel reinforcement and high strength bar. During specimen fabrication, the joint details enables ease and speed of construction. Connection performance is evaluated on the basis of ductility, energy dissipation capacity, connection strength, and drift capacity. Based on test results, the precast concrete beam-column connection is capable of matching or exceeding the performance of the monolithic connection.

• Steel and Composite Structures
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• 제5권2_3호
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• pp.141-158
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• 2005

The new version of Code for Design of Steel Structures (GB50017-2003) and other design standards in China were released over the last two years. Comparing with the previous version (GBJ17-88), many clauses covering the connection design have been revised. A number of additional provisions are supplemented to specify the design requirements for beam-column moment connections, as well as gusset plates for truss joints. In this paper, a summary on the design rules on connections specified in the current Chinese code is presented, and relevant commentary and background information is provided whenever appropriate. The design criteria governing weld and bolt resistance is examined and reviewed. Moreover, several issues such as detailing requirements for stiffeners and end-plate connections are discussed.

• 한국구조물진단유지관리공학회 논문집
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• 제16권1호
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• pp.9-17
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• 2012

본 연구는 소규모 지하통로, 저류시설 및 지중구조물에 많이 적용되고 있는 파형강판구조의 이음부강도를 실험적으로 평가하고자 하였다. 대골형파형강판을 사용하는 지중 강구조물은 압축력에 대하여 충분한 안정성을 확보하여야 한다. 그러나 현장에서 볼트 연결되는 이음부가 강판의 두께, 캐스킷, 와셔, 슬롯홀과 같은 연결상세에 따라 강도가 변화함에도 불구하고 이음부강도에 대한 실험적 이론적 결과가 설계에 반영할 수 있을만큼 충분히 축적되지 않은 상태이다. 본 연구에서는 다양한 연결상세를 적용한 경우의 이음부 압축거동을 실험적으로 분석하였다. 연구결과 강판의 두께가 증가함에 따라 강판지압파괴에서 볼트전단의 형태로 파괴 형태가 변화하는 것으로 나타났으며, 6.omm 이상의 플레이트에서는 개스킷과 슬롯홀을 적용한 이음부가 와셔를 적용한 경우보다 효과적인 거동을 보이는 것으로 관찰되었다.

• Structural Engineering and Mechanics
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• 제35권5호
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• pp.617-630
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• 2010

Different types of moment resisting connections are commonly used to transfer the induced seismic moments between frame elements in an earthquake resisting structure. The local connection behavior may drastically affect the global seismic response of the structure. In this study, the finite element and experimental seismic investigations are implemented on two frequently used connection type to evaluate the local behavior and to reveal the failure modes. An alternative connection type is then proposed to eliminate the unfavorable brittle fracture modes resulted from probable poor welding quality. This will develop a reliable predefined ductile plastic mechanism forming away from the critical locations. Employing this technique, the structural reliability of the moment resisting connections shall be improved by achieving a controllable energy dissipation source in form of yielding of the cover plates.

• Steel and Composite Structures
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• 제51권3호
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• pp.305-323
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• 2024

Previous experimental studies have effectively demonstrated the remarkable efficiency of the stiffened channel link in connecting circular columns and I-shaped beams. This research aims to present design criteria and assess the seismic properties of this specific connection type through numerical modeling. Various parameters, including stiffener type and geometric properties of the stiffened channel element, were duly taken into account. The findings from over 136 nonlinear finite element analyses (FEAs) reveal that the recommended detailing scheme reliably satisfies all the regulations specified for rigid beam-to-column connections in special moment frames.

• Steel and Composite Structures
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• 제19권4호
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• pp.877-895
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• 2015

Connections to circular hollow steel sections (CHS) are considered one of the most complex and time consuming connections in steel construction. Such connections are usually composed of gusset plates welded to the outside of the steel tube or penetrating the steel tube. Design guides, accounting for the effect of connection configuration on the strength of the connection, are not present. This study aims to investigate, through experimental testing and a parametric study, the influence of connection configuration on the strength of one sided branch plate-to-CHS members. A notable effect was observed on the behavior of the connections due to its detailing changes with respect to capacity, failure mode, ductility, and stress distribution. A parametric study is performed using the calibrated analytical model to include a wider range of parameters. The study involves 26 numerical analyses of finite element models including parameters of the diameter-to-thickness (D/t) ratio, length of gusset plate, and connection configuration. Accordingly, a modification to the formulas provided by the current design recommendations was suggested to include connection configuration effects for the one sided branch plate-to-CHS members.

• Steel and Composite Structures
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• 제26권3호
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• pp.315-328
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• 2018

Built-up Double-I (BD-I) columns consist of two hot rolled IPE sections and two cover plates which are welded by fillet welds. In Iran, this type of column is commonly used in braced frames with simple connections and sometimes in low-rise Moment Resisting Frames (MRF) with Welded Flange Plate (WFP) beam-column detailing. To evaluate the seismic performance of WFP connection of I-beam to BD-I column, traditional and modified exterior MRF connections were tested subjected to cyclic prescribed loading of AISC. Test results indicate that the traditional connection does not achieve the intended behavior while the modified connection can moderately meet the requirements of MRF connection. The numerical models of the connections were developed in ABAQUS finite element software and validated with the test results. For this purpose, moment-rotation curves and failure modes of the tested connections were compared with the simulation results. Moreover to avoid improper failure modes, some improvements of the connections were evaluated through a numerical study.

• 국제초고층학회논문집
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• 제11권1호
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• pp.41-50
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• 2022

The Spiral, a supertall tower at the Hudson Yards Zoning District of NYC is an new iconic commercial office tower. The spiraling terraces throughout the height of the building creates unique outdoor spaces at each level for its occupants while introduces structural challenges unlike common office towers. Innovative structural solutions and an integrated connection design and steel detailing delivery process proved to be a key factor in the success of the project.