C22 Beam Section - Product Spec Sheet


Summary The Beam Section module is a simple utility for designing concrete sections for combined bending, shear, and torsion. The module accommodates rectangular and T- sections. The single input table makes it quick and easy to enter the section geometry and ultimate loading.

What makes this module special?

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Simplified input

Suggested reinforcement output

Detailed calculations


Detailed Description Use the Beam Section module to design a concrete section subjected to moment, shear, and torsion forces.

The design calculates moment, shear, and torsional stresses in web and flange, and required reinforcement for each.

Some reinforcement configurations are also suggested in the output as guidelines. The section design output can be grouped on a Calcsheet for printing or sending to Calcpad . Various settings can be made with regards to the inclusion of design results and pictures.

Theory used in this module The normal code formulae apply when calculating flexural reinforcement for rectangular sections and for flanged sections where the neutral axis falls inside the flange. If the neutral axis falls outside the flange, the section is designed as two separate sub sections:  The first sub section consists of the flange without the central web part of the section and the remaining central portion defines the second sub-section.  By considering the total section, the moment required to put the flange portion in compression can be calculated using the normal code formulae. This moment is then applied to the flange sub section and the required reinforcement calculated using the effective depth of the total section.  The same moment is then subtracted from the total applied moment, the resulting moment is applied to the central sub section and the reinforcement is calculated.


The tension reinforcement for the actual section is then taken as the sum of the calculated reinforcement for the two sub sections. If compression reinforcement is required for the central sub section, it is used as the required compression reinforcement for the entire section. The module assumes that shear is resisted by the web portion of the section only. Shear stress is therefore calculated using the web area and checked not to exceed the ultimate allowable shear stress given in the code. The shear capacity is calculated using the required bending reinforcement and the shear reinforcement calculated using the normal code formulae. Depending on the option chosen, torsion can be resisted by the section as a whole or by the web portion only. For flanged beams, the torsion is calculated separately for the flange and web along the guidelines given in the code. The torsional shear stresses are checked to not exceed the ultimate allowable shear stress. Reinforcement requirements are also evaluated separately for the flange and web using the normal code formulae. For the Eurocode, the strut-and-tie model is used, and the angle of the struts can be specified within the limits of the code.

Supported Design Codes

Design Codes

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ACI 318 - 1999 ACI 318 - 2005 ACI 318 - 2011 ACI 318 – 2014 ACI 318 - 2019 AS 3600 - 2001 AS 3600 – 2009 AS 3600 - 2018 BS 8110 - 1985 BS 8110 - 1997

CP 65 - 1999

CSA A23.3-04 - 2010 CSA-A23.3:2019 Eurocode 2 - 2004 HK Concrete - 2004 HK Concrete - 2013

IS:456 - 2000 NZ 3101 - 2006

SABS 0100 – 2000 SP 63.13330.2018

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