When using BS 5950 - 1990, the parabolic stress-strain relationship given in BS 8110 - 1997 is used. The interaction between the base plate and supporting concrete or grout layer is taken in accordance with the relevant code. Since this is an upper bound method, allowable stresses are reduced by 20%. Stiffened base plates are analysed using yield line theory. The required base plate thickness is calculated by limiting the bending stress on each of the lines that extend from edge to edge and passing over a side of the rectangle. A rectangular perimeter that encloses the column cross-section is considered and the bending stress in the base plate evaluated on each of its four sides. Unstiffened base plates are analysed using elastic theory. The resulting concrete bearing stresses or stud forces are applied to the base plate during its analysis. The base plate is analysed as a beam on an elastic support. Given the interaction between the base plate and the concrete bearing surface, the clauses of the concrete design codes for bi-axially bent concrete columns are deemed reasonable for this purpose. The case of bi-axial bending is simplified by transforming the moments to an effective design moment about one axis. The application of the axial force as uniform distributed load in the webs serves as a mechanism to model the stiffening effect of the webs on the base plate. The effective applied column force and moment is applied to the base plate as a point load in the flanges and a uniform distributed load in the webs of the approximated section. Detailed drawings can be generated for editing and printing using the PROKON Drawing and Detailing System, Padds.ДЄ brief discussion of the application of the theory is given below.Дesign scope and assumptions The program can analyse column base plates that carry axial force and bi-axial moment. Base plates can bear on concrete or grout or can be supported on studs. Both stiffened or unstiffened base plates can be designed. The Base Plate Design module designs column base plates subjected to axial force and bi-axial moment. Simple connections Simple beam to column connections that do not transmit moments: Stiffened and unstiffened column base plates.Д«olted and welded beam-column connections with or without haunches.Д«olted or welded apex connections with or without haunches.ДЄxial force connections Welded hollow section connections can be designed for typical trusses, included triangulated space trusses. Moment connections The following types of moment transmitting connections can be designed: Shear connections Bolt groups and weld groups can be designed for eccentric in-plane shear. The PROKON suite includes several design modules for typical steel connections. Shear Connection Design 5-Error! Bookmark not defined. The steel connection design modules can be used for design of common welded and bolted steel connection.

Prokon column design