Neutral Axis Calculator - RC Section

Timber Column Design Calculator to AS 1720.1

Structural Engineering

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This template has been designed in accordance with AS3600-2018.

The neutral axis (N.A) is a line that passes through the centroidal depth of a symmetrical cross-section where there are no longitudinal stresses or strain. In an unsymmetrical cross-section, the N.A may differ from the centre of gravity of the centroidal axis.  

You can use this calculator to determine the depth to the Neutral Axis of an RC section in 3 different stages of concrete cracking:

 in structural engineering applications, picture a beam with an external load applied to it. When a beam is loaded, internal forces develop within it to maintain equilibrium. The internal forces in a beam have two components: 

There’s an area in the middle of the beam’s cross-section that is neither stretched nor squashed; this is known as the 

. At this point within the beam's cross-section, internal stresses are 

from top to bottom – passing through zero at the neutral axis. At this point, compressive and tensile stresses are in equilibrium - no internal stresses exist.

The location of the neutral axis depends on the 

of the RC section. Three different stages can be defined for the determination of 

🏁 Definition The neutral axis (N.A) is a line that passes through the centroidal depth of a symmetrical cross-section where there are no longitudinal

Kenny Kim

This calculator allows the user to assess the structural integrity of timber columns to ensure compliance with the Australian Standard AS 1720.1:2010. The calculation will identify the design capacities of timber columns to meet flexural, shear and deflection design requirements to Ultimate Limit State (ULS) and Serviceability Limit State (SLS) methods. 

This calculation has been written in accordance with AS1720. 

Australian Standards set out guidelines and minimum requirements for material properties, design parameters, design procedures and calculation methods. Here, we explain some pertinent timber properties that should be considered carefully when undertaking timber design calculations. 

Design Properties of Structural Timber Elements

Design capacities for all structural timbers are obtained by modifying characteristic capacities with factors appropriate to service conditions and material property type. This process applies to all types of timber.

Permissible allowable stress limits or design limit capacities of timber columns are then calculated for each check by multiplying the relevant characteristic properties, modification factors and geometric properties together:

This calculator allows the user to assess the structural integrity of timber columns to ensure compliance with the Australian Standard.

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