Neutral Axis Calculator - RC Section

Timber Column Design Calculator to AS 1720.1

Timber Beam Design Calculator to AS 1720.1

AISI Purlin and girts design

Rectangular Spread Footing Analysis to ACI 

Standard Steel Section Designer to AS4100

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: 

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 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 

🏁 Free-To-Use Neutral Axis Calculator for RC Section: Precisely Determine the Neutral Axis of a Reinforced Concrete Section. Calculate now!

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:

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Free-To-Use Timber Column Design Calculator to AS 1720.1: Design Stronger Timber Columns with CalcTree. Get started now

Welcome to CalcTree's Purlin and girt design tool! You will be able to determine the member capacities for purlins and girts according to AISI S100-16. The purlins are manufactured by AEP. All calculation units are in imperial units.

For a detailed rundown of designing purlins and girts, check out our design guide 

. But here's a brief summary to get you up to speed.

Purlins and girts are structural members used to support loads from sheathing and cladding in roofs and walls. They can be made from timber or steel, with steel sections being either C or Z-shaped and hot or cold-rolled. 

When designing purlins, the designer must consider various loads, such as dead, live, snow and wind loads, and check them against the bending, shear, torsion, buckling and deflection capacity of the purlin in accordance with relevant design codes. 

The maximum distance between steel purlins should be around 1200mm, with typical distances in residential buildings being about 600 to 800 mm. 

The depth of the purlins is usually estimated using the span/32 rule of thumb. C-section purlins are used in simple, non-continuous spans, while Z-section purlins are used in continuous lines of purlins for lapping at internal supports. 

Loads in buildings are concentrated or uniformly distributed over an area, so purlins would pick up different portions of the total load acting over the surface depending on their arrangement. Effective area is taken as the product of tributary width and breadth. Dead loads include the self-weight of building elements and superimposed dead loads, such as cladding, tanking, insulation, plaster, finishes, and services. 

The line load for dead loads is obtained by multiplying the tributary width and density. To simplify the design, tributary width is simply the distance between two adjacent members. 

In summary, when designing purlins, one should consider the load-bearing capacity, shape and orientation, and the type of loads the structure will bear.

Welcome to CalcTree's Purlin and girt design tool! You will be able to determine the member capacities for purlins and girts according to AISI.

This calculator allows the user to analyse a rigid rectangular spread footing with piers for uniaxial or biaxial resultant eccentricities.

This calculator allows the user to assess the structural integrity of standard steel sections to Australian Standard AS4100:2020.

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

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 understood and carefully considered when undertaking timber design calculations. 

AS1720.1 provides detailed guidelines for Ultimate Limit State (ULS) design. The calculation methods for design bending moment, shear and bearing capacities of structural timber members, joints and fasteners are robust enough to account for different scenarios and environmental factors. Permissible allowable stress limits or design limit capacities of timber beams 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 beams to ensure compliance with the Australian Standard.