Analytic Investigation of Shear Lag in Welded Connection of Tension Members with Double Channel and Rectangular Hollow Sections

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Barkhori Mehni, Moien | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42530 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Maleki, Shervin
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 of plane eccentricity of axial force, weld size, gusset thickness, and length of member and gusset are investigated. The two channels are connected with flanges to the gusset plate so the section is similar to rectangular hollow section, hence the shear lag coefficient is also investigated for hollow sections and the results are compared with the double channel case. In the end, the results of numerical analyses are compared with the AISC formulas and if needed better equations are proposed to calculate the shear lag coefficient
Keywords:
Tension Members ; Double Channel ; Rectangular Hollow Section (RHS) ; Shear Lag

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