Steel Structures Design Based on Eurocode 3 by Farzad Hejazi & Tan Kar Chun

Author:Farzad Hejazi & Tan Kar Chun
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

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4.Determine the design axial load and the design bending moments about the y-y and z-z axes. Design axial load is the summation of the total reaction (the design shear force of the beam) at the beam–column connection and the load applied to the column. The design bending moment about the y-y and the z-z axes is the moment induced by the eccentricity of the beam–column connection. In other words, ensuring that the shear force acting on the beam will act on the centroid of the column is difficult, and consequently, column bending will occur because of such eccentricity. The bending moment about the y-y axis is induced by the beam connected to the column flange, and the bending moment about the z-z axis is induced by the beam connected to the column web. The point at which shear force acts on the beam depends on the size of the bearing where the edges of the beam stand. Given that the moments induced by the opposite sides of the flange and the web about the same axis are in opposite directions, these moments will counter each other.

According to the SN005a-EN-EU Access Steel document, the beam reaction is assumed to act at 100 mm from the face of the column. Therefore, if the bearing size is not specified, the beam reaction can be assumed to be 100 mm.

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