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Analytic Investigation of Shear Lag in Welded Connection of Tension Members with Double Channel and Rectangular Hollow Sections
, M.Sc. Thesis Sharif University of Technology ; Maleki, Shervin (Supervisor)
Abstract
Tension members are widely used in steel construction, in trusses or in the braces etc. To design a tensile member with connection to the gusset plate a phenomenon called shear lag must be considered. Shear lag effect is introduced as a coefficient in the design codes. AISC code has proposed formulas to calculate the shear lag coefficient of different sec-tions but there is no equation for the double channel section. By considering double chan-nel as a two-separate-single-channel section the design would be very conservative. In this thesis, shear lag coefficient is parametrically investigated by numerical simulation of the double channel section. Different parameters like weld length, out...
The Shear Lag Effects on Welded Steel Single and Double Angle and HSS Tension Members
, M.Sc. Thesis Sharif University of Technology ; Maleki, Shervin (Supervisor)
Abstract
The shear lag phenomenon is one of the effective factors in determining the tensile capacity of tension members. In this phenomenon, there are various factors including the size and type of the cross-section, the type of connection, the length of connection, thickness of gusset plate, etc. are effective. The previous studies which are the basis of the specification equations, have been conducted on the cross-sections with bolted and riveted connections, while no study has been conducted to determine the effects of some of these factors yet. Using numerical methods, the present study investigates and compares each of the effective parameters on shear lag phenomenon on the single and double...
Shear Lag Effects on Shear Rupture Failure Mode of Welded Steel Channel Sections
, M.Sc. Thesis Sharif University of Technology ; Maleki, Shervin (Supervisor)
Abstract
Since mid-twentieth century the shear lag phenomenon has attracted many scientists’ attention which led to a wide range of researches to be carried out on this topic and the results are considered in the design codes. In tension members in which all parts of the member in the vicinity of the connection are not connected, only some parts of the section contribute to load distribution and non-connected parts do not play any role in load transfer and this leads to non-uniform distribution of stress and stress concentration. This phenomenon is called shear lag which causes reduction of tensile strength of the member. The effect of this phenomenon is introduced as a reduction coefficient...
Investigation of shear lag effect on tension members fillet-welded connections consisting of single and double channel sections
, Article Structural Engineering and Mechanics ; Volume 74, Issue 3 , 2020 , Pages 445-455 ; Maleki, S ; Mirtaheri, M ; Nazeryan, M ; Seyed Mahdi, M. S ; Sharif University of Technology
Techno Press
2020
Abstract
Shear lag phenomenon has long been taken into consideration in various structural codes; however, the AISC provisions have not proposed any specific equation to calculate the shear lag ratio in some cases such as fillet-welded connections of front-to-front double channel sections. Moreover, those equations and formulas proposed by structural codes are based on the studies that were conducted on riveted and bolted connections, and can be applied to single channel sections whilst using them for fillet-welded double channels would be extremely conservative due to the symmetrical shape and the fact that bending moments will not develop in the gusset plate, resulting in less stress concentration....