scholarly journals Performance of extended end-plate bolted connections subjected to static and blast-like loads

2021 ◽  
Vol 68 (1) ◽  
Author(s):  
Ahmed A. Osman ◽  
Sherif A. Mourad
Keyword(s):  
Energy Dissipation ◽  
Static Loading ◽  
Failure Modes ◽  
Numerical Models ◽  
Moment Connections ◽  
Dissipation Energy ◽  
Dynamic Increase Factor ◽  
Plastic Energy ◽  
End Plate ◽  
Extended End Plate

AbstractIn this study, numerical models were developed to predict the behavior of steel extended end-plate moment connections subjected to static and blast-like loading. Two types of extended end-plate connections were considered, stiffened, and unstiffened, with pretensioned bolts. The models were verified by comparing the results with published experimental data. The models were used to compute the moment-rotation curves for the connection under static loading, and then under different blast durations. The pressure impulse diagram and the energy dissipation for the connection under dynamic loading were determined. The failure modes were examined, and the numerical results were compared with the simplified models presented in codes and standards. Improvement in the performance of the connection by adding one or two stiffeners was demonstrated. For the configuration studied, introducing a stiffener increased plastic dissipation energy for blast loading by 45% compared to the unstiffened connection, whereas under static loading, the plastic energy dissipation for stiffened connection, SC2, was higher than the unstiffened connection by 30%. A conservative estimate for the dynamic increase factor (DIF) was found to be 1.2 for steel yield stress and 1.05 for bolt failure.

Energy dissipation capacity of an unstiffened extended end-plate connection with a SMA plate

2016 ◽  
Vol 16 (4) ◽  
pp. 1309-1317 ◽  
Author(s):  
J. G. Yang ◽  
J. W. Kim ◽  
J. H. Lee ◽  
J. S. Kang ◽  
D. S. Pae
Keyword(s):  
Energy Dissipation ◽  
End Plate ◽  
Energy Dissipation Capacity ◽  
Extended End Plate ◽  
Plate Connection

Plastic Energy Dissipation Model for Lifetime Prediction of Zirconium and Zircaloy-4 Fatigued at RT and 400°C

1998 ◽  
Vol 120 (2) ◽  
pp. 114-118 ◽  
Author(s):  
Xiao Lin ◽  
Gu Haicheng
Keyword(s):  
Electron Microscopy ◽  
Energy Dissipation ◽  
Fatigue Damage ◽  
Low Cycle Fatigue ◽  
Cyclic Hardening ◽  
Damage Mechanism ◽  
Fatigue Properties ◽  
Dissipation Energy ◽  
Plastic Energy ◽  
Plastic Dissipation

Low cycle fatigue properties of zirconium and zircaloy-4 were investigated at RT and 400°C. The microscopic structure was determined using scanning electron microscopy and transmission electron microscopy techniques. On the basis of analyses of fatigue damage mechanism, it is believed that fatigue is an irreversible energy dissipation process. Thus, the plastic dissipation energy per cycle is selected as a fatigue damage variable. The accumulated plastic dissipation energy is calculated at the condition of considering cyclic hardening, saturation and softening characters of zirconium and zircaloy-4 during cycling. The testing results show that there present a power law between the plastic dissipation energy and fatigue lifetime.

scholarly journals Behavior of I-beam bolted extended end-plate moment connections

2013 ◽  
Vol 4 (4) ◽  
pp. 685-699 ◽  
Author(s):  
Abdelrahim Khalil Dessouki ◽  
Ahmed Hassan Youssef ◽  
Mohamed Mostafa Ibrahim
Keyword(s):  
Moment Connections ◽  
End Plate ◽  
Extended End Plate

scholarly journals Seismic Behavior of Extended End-Plate Connections Subjected to Cyclic Loading on the Top-Side of the Column

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3724 ◽  
Author(s):  
Liang Luo ◽  
Jiangui Qin ◽  
Dongzhuo Zhao ◽  
Zhiwei Wu
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
Lateral Displacement ◽  
Limit State ◽  
Skeleton Curve ◽  
End Plate ◽  
Weak Beam ◽  
Extended End Plate ◽  
Plate Connections ◽  
Curve Skeleton

The extended end-plate connections provide excellent performance in resisting seismic loads in high-risk areas. Most scholars’ experiments and finite element studies on this type of joint are focused on the method of applying displacement loads on the beam tip, while the method of applying displacement on the column side has not been the subject of further study. However, the load transmission mechanism of this type of connection is not completely consistent in actual engineering, as the design concept of “strong column weak beam” does not apply to all joints. Therefore, in this paper, the lateral displacement of the applied column is used to simulate the seismic horizontal force to study the mechanical properties of the connection joints of the “weak column and strong beam” under the limit state of earthquake action. Based on the two internal columns (IC-EP1/2) and two edge columns (EC-EP1/2), the failure modes, strength, stiffness, moment–rotation curve, skeleton curve, ductility, and energy dissipation of this type of connection were studied. Experiment results indicated that this type of connection features semi-rigid and partial strength joints. The connection rotation angle of all specimens in the test exceeds 0.05 rad, which suggests it is an ideal seismic joints. Besides, the relationship between the thickness of the end-plate and the diameter of the bolt has a greater impact on the failure mode of the joint. The finite element (FE) analysis models were established for the above connection. The numerical model was validated against experimental results and showed acceptable consistency.

Numerical Models of End-Plate Assembling Bolt Connection of Angle Profiles

2015 ◽  
Vol 752-753 ◽  
pp. 552-557
Author(s):  
Anežka Jurčíková ◽  
Přemysl Pařenica ◽  
Miroslav Rosmanit
Keyword(s):  
Analytical Solution ◽  
Failure Modes ◽  
Numerical Models ◽  
Simplified Model ◽  
Accurate Model ◽  
End Plate ◽  
The Common ◽  
Bolt Connection

The aim of this work was to create numerical models of the common truss-type assembling joints of L-profiles. Two different models were created – basic (simplified) model of joint and more accurate model which corresponds to the experimental specimens in preparation. Models with different end-plate thicknesses and consequently with different failure modes were solved. The results obtained from numerical models were compared with the analytical solution of such joints using the Eurocode procedure recommended in EN 1993-1-8. These results are planned to be verified and further developed based on planned experiments.

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