scholarly journals Parametric Analysis and Stiffness Investigation of Extended End-Plate Connection

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5133
Author(s):  
Liang Luo ◽  
Maohua Du ◽  
Jian Yuan ◽  
Jun Shi ◽  
Suhui Yu ◽  
...  
Keyword(s):  
Finite Element ◽  
Reference Method ◽  
Steel Structures ◽  
Calculation Model ◽  
Initial Stiffness ◽  
Fe Method ◽  
End Plate ◽  
Panel Zone ◽  
Extended End Plate ◽  
Plate Connection

Extended end-plate (EP) bolted connections are widely used in steel structures as moment-resisting connections. Most of these connections are semi-rigid or in other words flexible. The paper aims to study the behavior of such connections under the effect of column top-side cyclic loading using the finite element (FE) method. For semi-rigid connections, it is very vital to determine the moment-rotation relationship as well as the connection stiffness. These beam-column connections have been parametrically studied, the effect of joint type, shear forces, diameter of bolt, thickness of end-plate, and end-plate style were studied. Parametric studies show that the panel zone shear force is the key factor and has a significant effect on the connection stiffness. Finally, based on the component method, the stiffness of the bending component is improved, and the initial stiffness calculation model of the connection under column top-side cyclic loadings is established. The results show that the calculation model is in good agreement with the finite element analyses, and this proves that the calculation model proposed in this study could act as a reference method.

Design Approach of Stiffeners and Model of the Initial Stiffness in Extended End-Plate Connection

2011 ◽  
Vol 243-249 ◽  
pp. 942-947 ◽  
Author(s):  
Wei Zhao ◽  
Qian Liu
Keyword(s):  
Design Method ◽  
Tensile Force ◽  
Steel Structures ◽  
Good Precision ◽  
Design Codes ◽  
Initial Stiffness ◽  
Component Method ◽  
End Plate ◽  
Extended End Plate ◽  
Plate Connection

End plate stiffener failures occure in a number of tests in recent years. And no relevant rules are given in design codes for steel structures. A design method for angles and thickness of stiffeners in extended end plate connecionts is derived by requiring the eqaul distribution of tensile force among bolts inside and outside of beam flange. And a balance between the force transmitted by the stiffener and by the beam flange is considered too. Comparisons with results of ANSYS show that the stiffeners designed by the proposed method in this paper are able to change the extended portion of endplates from one side clamped to 2 panels fixed on two adjacent sides. Simple formulas for calculating rotational rigidities of the connections with and/or without stiffeners were also proposed with component method, in which the end-plate stiffness, column flange stiffness and bolt stiffness are inclueded. Comparisons with results of ANSYS show that the proposed equations have good precision and can be applied to pratical engineering.

Experimental Investigation of Retrofitted Extended End-Plate Connections

2013 ◽  
Vol 284-287 ◽  
pp. 1330-1333
Author(s):  
Poi Ngian Shek ◽  
M.Md. Tahir ◽  
Cher Siang Tan ◽  
Arizu Sulaiman
Keyword(s):  
Experimental Tests ◽  
Horizontal Shear ◽  
Initial Stiffness ◽  
Component Method ◽  
End Plate ◽  
Theoretical Predictions ◽  
Extended End Plate ◽  
Plate Connections ◽  
The Moment ◽  
Plate Connection

A series of retrofitted extended end-plate connections have been tested experimentally and evaluated using the component method specified in Eurocode 3. The component method decomposed the end-plate connection into several components, including the tension zone, compression zone, vertical and horizontal shear zone that occurred at the bolt, end-plate, beam and column. Based on the theoretical model, the moment resistance and the initial stiffness of a connection can be predicted. Four experimental tests on the retrofitted extended end-plate connections have been conducted to verify the proposed design method. From the experiment tests, all moment resistance of the connections showed good agreement with theoretical predictions, which establish a reliable foundation to predict the moment resistance of the retrofitted end-plate connection. All initial stiffnesses calculated from theoretical predictions do not represent the actual behaviour of tested connection. All tested connections can be classified as partial strength based on EC 3: Part 1.8, in condition the welding capacity is at least 50% higher than the capacity calculated from the component method.

scholarly journals Analysis of the Mechanical Behavior of Bolted Beam-Column Connections with Different Structural Forms

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Rongqian Yang ◽  
Xuejun Zhou
Keyword(s):  
Finite Element ◽  
Mechanical Behavior ◽  
Simulation Analysis ◽  
Element Model ◽  
Hysteretic Behavior ◽  
Load Bearing ◽  
End Plate ◽  
Extended End Plate ◽  
Plate Connections ◽  
Plate Connection

In order to study the mechanical behavior of bolted beam-column connections, the accuracy and applicability of the finite element model were firstly validated according to the published experiments on end-plate connections using ABAQUS. Then, in order to discuss the mechanical behavior of connections, three semirigid connections which are convenient for prefabricated construction, including top-and-seat angle connections with web and ear plate, extended end-plate connection, and T-stub connection, were examined using numerical simulation analysis to study and compare their capacity, hysteretic behavior, ductility, and degradation characteristics in detail. The results showed that the finite element models that were built could effectively simulate the load bearing behavior of bolted connections under both single-direction loading and cyclic loading. The three connections showed good load bearing capacity. The connectors significantly affected the energy dissipation capacity under load. The extended end-plate connection demonstrated the best performance in both mechanical behavior and manufacture and installation, so it would therefore be the preferred option.

scholarly journals Rotation Stiffness Investigation of Spatial Joints with End-Plate Connection

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Shizhe Chen ◽  
Jianrong Pan ◽  
Zhan Wang ◽  
Chao Zhou
Keyword(s):  
Finite Element ◽  
Mechanical Behaviour ◽  
Failure Modes ◽  
Reference Method ◽  
Calculation Model ◽  
Finite Element Analyses ◽  
Spatial Coupling ◽  
End Plate ◽  
Rotation Stiffness ◽  
Plate Connections

Spatial joints with end-plate connections show significant spatial coupling effects under spatial loading. Mechanical behaviour and failure modes of these spatial joints differ from those of planar joints. This study involved experiments and finite element analyses with respect to planar joints with end-plate connections under static load. The numerical results agreed well with the experimental data, and this verified the adequacy of the finite element analyses. Then, finite element models of the spatial interior joint, exterior joint, and corner joint were established to analyse the difference between the mechanical behaviour of spatial joints and planar joints. The component method was used to analyse components contributing to the initial stiffness of spatial joints. An initial rotation stiffness calculation model of spatial joints was proposed based on the deformation of joints. The findings indicated that results of the calculation models were in good agreement with those of the finite element analyses, and this proved that the calculation model proposed in this study could act as a reference method.

Model of the Initial Stiffness in Extended End-Plate Connection

2013 ◽  
Vol 321-324 ◽  
pp. 1766-1769
Author(s):  
Jian Li Zhao
Keyword(s):  
Great Influence ◽  
Order Effects ◽  
Lateral Stiffness ◽  
Rotational Stiffness ◽  
Initial Stiffness ◽  
End Plate ◽  
Extended End Plate ◽  
Plate Connections ◽  
Plate Connection ◽  
Frame Stiffness

Extend end-plat bolted connections are widely used in steel frames. The rotational stiffness has great influence on steel frame stiffness and deformation. The decrease of the frame lateral stiffness, due to connection rotational deformability, leads to the increase of the period of vibration and the frame sensitivity to second-order effects. This thesis divides the end plate into several parts equivalent to different Timoshenkos beams to determine their contribution to rotational stiffness of the connection. Then stiffness of all parts and bolts is given, and then the component method is used to calculate rotational initial stiffness of extended end-plate connections. Comparisons with results of ANSYS and related tests show that the proposed equations have excellent precision. And the calculating process is simple and easily applicable in practice.

Analytical Study of End-Plate Connection on Cruciform Column Section

2015 ◽  
Vol 74 (4) ◽  
Author(s):  
Boon Cheik Tan ◽  
Poi Ngian Shek ◽  
Mahmood Md Tahir ◽  
Ker Shin Mu
Keyword(s):  
Analytical Study ◽  
Experimental Results ◽  
Analytical Prediction ◽  
Initial Stiffness ◽  
Component Method ◽  
End Plate ◽  
Column Section ◽  
Extended End Plate ◽  
The Moment ◽  
Plate Connection

This paper presents an analytical study on flush end-plate (FEP) and extended end-plate (EEP) connections connected to cruciform column section using component method. The objective of this study is to predict the moment resistance and initial stiffness of FEP and EEP connections on cruciform column section. A series of FEP and EEP connections are tested in laboratory. The connection tests consist of four FEP and four EEP specimens with different configuration. Component method outlined in the publication of Steel Construction Institute and British Constructional Steelwork Association are based on BS5950 and Eurocode 3 (EC3) are used to predict the moment resistance and initial stiffness of the tested specimens. The experimental results are then used to validate the analytical predictions. As compare to the experimental results, all moment resistance of the connections coincide well with analytical predictions. Analytical prediction for initial stiffness using EC3 does not show good agreement with the experimental results. This study shows that the component method can be used to predict the moment resistance of FEP and EEP connections on cruciform column section. Further study need to be carried out for initial stiffness to obtain accurate analytical representation.

Analysis on the Seismic Behavior of Extended End-Plate Connections of Steel Frame Structure

2012 ◽  
Vol 193-194 ◽  
pp. 1405-1413 ◽  
Author(s):  
Zhu Ling Yan ◽  
Bao Long Cui ◽  
Ke Zhang
Keyword(s):  
Finite Element ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Frame Structure ◽  
End Plate ◽  
Rigid Connection ◽  
Extended End Plate ◽  
Plate Connections ◽  
Steel Frame Structure

This paper conducts analysis on beam-column extended end-plate semi-rigid connection joint concerning monotonic loading and cyclic loading of finite element through ANSYS program, mainly discussed the influence of parameters such as the form of end plate stiffening rib on anti-seismic performance of joint.

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