Cyclic loading of end plate moment connections

2000 ◽  
Vol 27 (4) ◽  
pp. 683-701 ◽  
Author(s):  
B T Adey ◽  
G Y Grondin ◽  
J JR Cheng
Keyword(s):  
Cyclic Loading ◽  
Arc Welding ◽  
Plate Thickness ◽  
Welding Process ◽  
Design Parameters ◽  
Prediction Equations ◽  
Moment Connections ◽  
End Plate ◽  
Extended End Plate ◽  
Arc Welding Process

An experimental investigation of 15 cyclically loaded extended end plate connections was undertaken to assess the significance of some design parameters. The parameters investigated were beam size, bolt layout, end plate thickness, use of extension stiffeners, welding process, and weld preparation. Eleven of the 15 full-scale test specimens were designed to confine failure to the end plate and four were designed to develop the plastic moment capacity of the beam. Of the beam sizes tested (W360×51, W460×97, and W610×125) the W460×97 beam connections provided the most ductility. The relaxed bolt configuration provided more energy dissipation and connection ductility. The use of extension stiffeners improved the ability of the end plates to dissipate energy and increased the connection rotation at yield. An increase in end plate thickness results in an increase in the connection flexural strength. No significant difference in behaviour was observed between the connections fabricated using the shielded metal arc welding process and those fabricated using the flux-cored arc welding process. Bolt bending and loss of preload were observed in all the test specimens. End plate thickness prediction equations proposed by various researchers were evaluated by comparing predicted plate thickness with plate thickness used for the test specimens. New prediction equations that use yield lines in close agreement with those observed in the test specimens are proposed. The proposed prediction equations are able to predict the thickness of the end plate to within 13%. The proposed prediction equations are applicable to stiffened and unstiffened end plate moment connections with various bolt layouts. Extended end plate moment connections showed good potential for use in seismic zones.Key words: cyclic loading, energy absorption, extended end plates, moment connections, steel, yield line.

scholarly journals Extended end plate moment connections under cyclic loading

1998 ◽  
Vol 46 (1-3) ◽  
pp. 435-436 ◽  
Author(s):  
B.T Adey ◽  
G.Y Grondin ◽  
J.J.R Cheng
Keyword(s):  
Cyclic Loading ◽  
Moment Connections ◽  
End Plate ◽  
Extended End Plate

Simulation of Arc Welding Process

2013 ◽  
Vol 837 ◽  
pp. 55-60
Author(s):  
Viorel Cohal
Keyword(s):  
Residual Stresses ◽  
Arc Welding ◽  
Welding Process ◽  
Design Parameters ◽  
Welding Parameters ◽  
Physical Factors ◽  
Heat Sources ◽  
Original Design ◽  
Reliability Modeling ◽  
Arc Welding Process

This paper presents a program for modeling and optimization of the arc welding process. Interface of the program is divided: time-synchronized monitoring multiple welding robots, a quick calculation options are various parameters, quickly replace the original design parameters (sequence of welding, etc.), the high degree of reliability modeling of welding defects, overheated regions, distortion and residual stresses in structures, intuitive visualization and control mechanism of the modeling process. Process variables are easy to evaluate quickly by changing the welding parameters, leading to systematic optimization of fusion zones, heat-affected zones, residual stress, and distortions. The software provides tools for reporting display of distortion, temperature distribution, residual stresses, and curve progression of physical factors on fixed measuring points. As a production process tool, simulation offers an interface to RoboCad, as well as an export interface to robots. Welding paths can be simulated in real speed, direction, and inclination, and the program is capable of tracking different heat sources (Goldak model, volume sources, surface heat sources with Gauss distribution, and combinations of this). This paper presents RobotStudio simulation of welding of parts. Optimum welding parameters are set using Simufact.welding modeling.

scholarly journals Cyclic Behavior of Bolted Extended End-Plate Moment Connections with Different Sizes of End Plate and Bolt Stiffened by a Rib Plate

2018 ◽  
Vol 4 (1) ◽  
pp. 200 ◽  
Author(s):  
Abbas Haghollahi ◽  
Reza Jannesar
Keyword(s):  
Cyclic Loading ◽  
Numerical Study ◽  
Equivalent Plastic Strain ◽  
Cyclic Behavior ◽  
Moment Frames ◽  
Moment Connections ◽  
Element Analysis ◽  
Inertia Moment ◽  
End Plate ◽  
Extended End Plate

This paper presents a numerical study on the behavior of prequalified Bolted Extended End Plate (BEEP) moment connections when are affected by cyclic loading. Specimens were six four-bolt extended end-plate connections consist of H-shaped columns and I-shaped beams with different geometry as well as different end-plate size and bolt diameter; three of them were stiffened by a triangular rib plate welded to the top and bottom of the beam flanges, and others remained unstiffened. They were modeled in ABAQUS software and their cyclic behavior was evaluated using finite element analysis. Responses of specimens were examined by presenting their equivalent plastic strain, stress distribution, and moment-rotation hysteretic curves. Results revealed that with the increase of beam height and inertia moment in equal story drift rotations, the reduction of connection strength occurred earlier due to the occurrence of local buckling in the beam web and flange after subjecting to cyclic loading. By comparing moment-rotation hysteretic responses of specimens, it was found out that in unstiffened BEEP connections with thinner end-plate, the use of single vertical rib stiffener can slightly improve their cyclic behavior, but in connections with thicker end plate, it showed no considerable effect. It was concluded that the BEEP connections whose dimensions are not based on the tenth code of the Iranian national building regulations, cannot satisfy the criteria of AISC seismic provisions for both special and intermediate steel moment frames, although they experienced no local beam web and flange buckling.

scholarly journals A study of parametric effects on thermal profile of submerged arc welding process

2015 ◽  
Vol 12 (1) ◽  
pp. 43-56 ◽  
Author(s):  
Abhijit Sarkar ◽  
R.N. Rai ◽  
S.C. Saha
Keyword(s):  
Arc Welding ◽  
Plate Thickness ◽  
Welding Process ◽  
Source Model ◽  
Submerged Arc Welding ◽  
Welding Parameters ◽  
Parametric Effects ◽  
Weld Parameters ◽  
Arc Welding Process ◽  
Submerged Arc

In this study, a Numerical model is carried out to study the effect of welding parameters on the temperature variations in Submerged Arc Welding process (SAW) with moving heat source model (Gaussian distribution) by using finite difference method (FDM). The proposed method is validated from the experimental results and found is in good agreement with results obtained by experimental. The mathematical model of transient thermal is also recognized to simulate Peak temperature. Finally Parametric effects on temperature profiles based on numerical results, are carried out for different weld parameters including welding speed, heat input, and plate thickness. It has been shown that all those parameters are playing an essential role in affecting the temperature distribution.

The Determination of Noxes Emissions in Case of Manual Arc Welding Process with Coated Electrode

2018 ◽  
Vol 69 (7) ◽  
pp. 1826-1829
Author(s):  
Claudiu Babis ◽  
Augustin Semenescu ◽  
Oana Roxana Chivu ◽  
Maria Alina Gligor ◽  
Gabriel Iacobescu ◽  
...  
Keyword(s):  
Production System ◽  
Arc Welding ◽  
Welding Process ◽  
Practical Method ◽  
Machine Building ◽  
Short Exposure ◽  
Metal Bath ◽  
Coated Electrode ◽  
Manual Arc Welding ◽  
Arc Welding Process

The occupational risk assessment of a machine building company must cover each activity and workstation, taking into account each component of the production system (work system), each workload, work equipment and the work environment. This assessment is an extremely complicated and complex issue since the production system of such an enterprise is particularly complex and complicated. Welding assembly is a highly polluting technology process, especially of the atmosphere and soil. The formation of gases in the welding process is the result of burning of the electrodes, powders, forming the molten metal bath and making the weld seam. Welding operators are exposed to smoke and toxic gases resulting from the welding process, which can in many cases be hazardous to health. Many acute intoxications that may be caused by excessive exposure to or short exposure to smoke and gas resulting from the welding process have been studied over time. In the paper are presented the elements of risk related to the welding process and the most widespread occupational diseases that can occur in the ranges of the welding operators. The following are presented the noxious emissions from welding and are determined by a practical method the emission of noxious at welding deposition of a welding sample, using the manual arc welding process with coated electrode.

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