Abstract
The shear lag phenomenon is known to reduce the tensile capacity of tension members. There are various parameters affecting shear lag that have not been considered before. In addition, previous studies have been conducted mainly on single steel sections. Using numerical methods, the present study investigates the effects of relevant parameters on shear lag in single‐ and double‐angle sections welded at both legs. The studied parameters are connection eccentricity, connection length, gusset plate thickness, member‐free length, and connection‐free length. The results of the numerical analyses show that, in single‐angle connections, the effects of connection length, connection eccentricity, and gusset plate thickness are more pronounced, while in double‐angle connections the last parameter is not very critical. Comparing the results with the AISC‐LRFD predictions, it is concluded that the specification relations are conservative in most cases. In order to reduce the overconservatism, some new equations for shear lag estimate are introduced.
Highlights
In steel structures, sections such as angles, channels, and hollow sections, among others, are generally used as tension members in bracings and truss configurations
The line of action of the load usually does not coincide with the centroidal axis of a tension member, and eccentric loading and bending of the member is induced. e combination of these effects leads to the shear lag phenomenon and possible member rupture in the connection area
Ways and approaches in determining this factor vary in different specifications. e common equation given in AISC [1] specification to calculate the shear lag factor of tension members is as follows: 1− x U, (1)
Summary
E shear lag phenomenon is known to reduce the tensile capacity of tension members. ere are various parameters affecting shear lag that have not been considered before. E shear lag phenomenon is known to reduce the tensile capacity of tension members. Previous studies have been conducted mainly on single steel sections. The present study investigates the effects of relevant parameters on shear lag in single- and double-angle sections welded at both legs. E studied parameters are connection eccentricity, connection length, gusset plate thickness, member-free length, and connection-free length. E results of the numerical analyses show that, in single-angle connections, the effects of connection length, connection eccentricity, and gusset plate thickness are more pronounced, while in double-angle connections the last parameter is not very critical. Comparing the results with the AISC-LRFD predictions, it is concluded that the specification relations are conservative in most cases. In order to reduce the overconservatism, some new equations for shear lag estimate are introduced
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