• Journal of Korean Association for Spatial Structures
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• v.4 no.1 s.11
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• pp.69-75
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• 2004

In the construction of row-rise steel buildings, double angle connection can be considered as one of most effective connection types. Its connection flexibility depends mainly on several parameters such as angle thickness, bolt gage distance, and number of bolts. To establish the effect of the variation of the number of bolts on the moment-rotation relationship, three experimental tests have been conducted in this research. Based on the results of each experimental test, the rotational stiffness of each angle specimen can be calculated by performing regression analysis. Considering the results of regression analysis, we concluded that the more the number of bolts used in double angle connection, the higher the rotational stiffness as one can expected.

• Magazine of the Korea Concrete Institute
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• v.9 no.2
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• pp.167-177
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• 1997

In thtx design of ductile moment -1csist1ng frnmcls (DMRFs) f'ollow~ng the. stlong columnweakbeam design philosophy, it is desirable that the joint and column remain essentiallyelastic in order to insure proper energy dissipation and lateral stability of the structure.Thv joint has been identifid as the "weak link: in DMRFs because any stiffness orstrength deterioration in this region can lead to substantial drifts and the possibility ofcollapse due to t'-delta effects. h3oreove1.. the tngintw is faced with the difficult task ofdetailing an element whose size is determined by theframing members, but \vhich mustresist a set of loads very different from those used in the design of the beams and columns.Four 3 -scale beam-column-slab joint assemblies were designed according to existing cod\ulcornerrequirements of' ACI 318-89. representing perimeter joints of DMRFs with reinforced highstrength concrete. The influence on aseismic behavior of beam-column joints due tomonolithic slab, has been investigated.lab, has been investigated.

• Journal of Korean Association for Spatial Structures
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• v.4 no.4 s.14
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• pp.55-63
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• 2004

Double angle connections are commonly used for the construction of the low-rise steel framed buildings. Several experimental tests lave been conducted to investigate the effect of the number of bolts on the rotational stiffness of a double angle connection. Several parameters are obtained by performing regression analysis. An analytical model has been introduced to calculate the initial stiffness of a double angle connection in this research.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.2A
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• pp.207-214
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• 2008

This study presents a way to validate the quality level of the proposed connection type and verify the experimental test, and performs a 3D nonlinear analysis corresponding to the experimental test. Two mixed-structure beams were cast and tested under a four-point static loading. Force-displacement relation, force-strain relation, force-opening width, and failure mode were observed from comparing the numerical results of the adopted FE model. Nonlinear analysis of mixed structures was carried out by utilizing the contact elements of a general purpose structural analysis computer program (ABAQUS). The results of numerical and experimental simulation show that the proposed L-shaped connection has greater stiffness under flexural loading and better structural performance with regard to the connection.

• Journal of the Earthquake Engineering Society of Korea
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• v.13 no.6
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• pp.59-65
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• 2009

The use of precast concrete segments facilitates quality control and reduces construction cost and period. However, as a construction method it has limited applicability, for it demonstrates structurally disadvantageous behaviors due to stress concentration and large displacement in the joint of assembled segments. This paper proposes a precast segment joint with improved structural performance, and experimentally assesses the structural performance of the proposed joint in terms of crack and failure modes, deformation, maximum load and displacement ductility. In consideration of constructability and structural performance, this paper suggests different types of joint with shear key, post tension and steel rods as variables, and performs a static loading test on them. The test results show that the performance of SGSP specimens is around 84% that of a monolithic specimen in terms of the maximum load, while their ductility behaviors are better than the monolithic specimen. This result confirms the improved structural performance and applicability of the proposed joint.

• Journal of Korean Society of Steel Construction
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• v.29 no.4
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• pp.323-330
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• 2017

The pre-engineered building(PEB) construction has been gradually applied to single story buildings as a practical and efficient alternative to conventional buildings. However, there has been a few structure collapse due to suddenly excessive load. Although a structure design requires accurate and professional skills, the PEB system tends to be designed simply because of complexation of structural analysis for connections. This paper shows the finite element analysis(FEA) using ABAQUS software on bolted connection which was previously tested. The FEA condignly simulated the behavior of bolted connection in PEB system and was in close agreement with experimental results. Then the stiffness reduction factor of the bolted joints that can be used in the actual design is presented through the analysis of the joint parameters.

• Journal of Korean Society of Steel Construction
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• v.27 no.3
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• pp.299-310
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• 2015

CFT(Concrete-Filled Tube) structures have problems at processing cause closed section and concrete filling problems. In this study, a CFT structure that uses different types of diaphragms in its upper and lower connections to improve the concrete filling was tested and analyzed via the FEM program. Implementation of variable analysis of EP-T type to find out the reason that effect on the resistance force of the connection. As a result, through experiments and analysis investigated the structural characteristics of circular CFT beam-to-column connection.

• Journal of Korean Society of Steel Construction
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• v.26 no.2
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• pp.81-89
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• 2014

Investigation results on shear connections design procedure which is conducted in Korea show that there are many communication problems between structural engineer and detailer, and there are unnecessary work procedures. To solve conventional connection design procedure problems, improved shear connection design procedure is suggested. Most of suggested design procedure is controlled by structure engineer, and the introduction of connections standardization makes computer aided design possible. Standardized connection details are satisfied with structural safety and constructability, and it improves design efficiency. Many problems which are caused by conventional design procedure are fundamentally blocked by using suggested design procedure.

• Journal of Korean Association for Spatial Structures
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• v.6 no.2 s.20
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• pp.85-92
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• 2006

Precast large panel structures have various connection system such as the horizontal slab-to-wall connection, the vertical wall to wall connection, horizontal slab-to-slab connection, etc. Horizontal connection is connected by vertical tie bars, and vertical joint is connected loop bars and shear keys. The basic function is equalized deformations on later forces and the entire wall panel assembly acts as monolithic actions. Under lateral load some slip occurs in almost vertical connections. The shape and detail of precast connections are very important to the monolithic behavior of overall structures. The paper is a study on the design method and new elasto-plastic analysis of the connections by rigid-bodies spring model.

• Journal of the Earthquake Engineering Society of Korea
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• v.2 no.1
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• pp.35-46
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• 1998

Structural damage is used to be modeled through reductions in the stiffness of structural elements for the purpose of damage estimation of structural system. In this study, the concept of joint damage is employed for more realistic damage assessment of a steel structure. The joint damage is estimated damage based on the mode shape informations using neural networks, The beam-to-column connection in a steel frame structure is represented by a rotational spring at the fixed end of a beam element. The severity of joint damage is defined as the reduction ratio of the connection stiffness with respect to the value of the intact joint. The concept of the substructural identification is used for the localized damage assessment in a large structure. The feasibility of the proposed method is examined using an example with simulated data. It has been found that the joint damages can be reasonably estimated for the case with the measurements of the mode vectors subjected to noise.