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# Category Archives: UDFs

## Evaluating text with units and finding the neutral axis

A few weeks ago a comment asked for guidance on finding the moment capacity of a reinforced concrete section. This post will look at finding the depth of the neutral axis (NA) in a rectangular section, with a single layer of … Continue reading

Posted in Beam Bending, Concrete, Excel, Maths, Newton, UDFs, VBA
Tagged depth of neutral axis, elastic analysis, EvalU, evaluate text strings, evaluate units, Excel, Reinforced Concrete, UDF, ULS analyis, unit aware, VBA
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## Section Properties with MeshPY, including torsion and warping

I recently discovered robbie van leeuwen’s structural engineering blog, which has an open-source set of Python routines for calculation of section properties, including torsion and warping constants. The program uses the MeshPY Library for generating the finite element meshes required … Continue reading

Posted in Beam Bending, Concrete, Excel, Finite Element Analysis, Frame Analysis, Link to Python, Maths, Newton, Numerical integration, NumPy and SciPy, Strand7, UDFs, VBA, xlwings
Tagged Excel, MatPlotlib, MeshPY, Python, section properties, Torsion, UDF, VBA, Warping
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## Brent’s Method; Update and Examples

Has the free software at this site saved you time and/or money? If so, please contribute to the Raw Impact charity group providing practical help to poor communities in Cambodia: Everydayhero – Cambodia 2018 All contributions gratefully accepted. Contributions are … Continue reading

Posted in Arrays, Excel, Maths, Newton, UDFs, VBA
Tagged Brents method, Excel, inverse quadratic, iterative solution, Maths, UDF, VBA
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## Update to AL-Spline-Matrix

Posted in AlgLib, Excel, Maths, Newton, UDFs, VBA
Tagged AlgLib, Cubic spline, Excel, spline curve fitting, UDF, VBA, weights and constraints
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## Composite Beam Spreadsheet Update 1.01

Following a comment here, I have modified the Composite Beam spreadsheet to correct the stage 1 stresses forces in the reinforcement as listed in Columns 6 and 7, when the tensile face is the top. The output has also been … Continue reading

Posted in Beam Bending, Concrete, Excel, Newton, UDFs, VBA
Tagged AS 3600, AS 5100, Composite beam design, Excel, Prestressed concrete, Reinforced Concrete, UDF, VBA
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## Using Flash Fill

There have been several posts here on using functions or user defined functions (UDFs) to extract text or numbers from a longer string (most recently, here), but for many purposes it is quicker and easier to use the “flash-fill” feature, … Continue reading

Posted in Excel, UDFs, VBA
Tagged Excel, Extract number from string, ExtractNums UDF, flash-fill
1 Comment

## Working with implied units – update

Following comments at Eng-Tips I have added two examples with different procedures for evaluating ACI equations for the flexural tensile strength of concrete here.

Posted in Excel, Maths, Newton, UDFs, VBA
Tagged ACI 318, Customary US Units, Eval, EvalU, Evaluate text, Excel, Implied units, shear capacity, SI Units, UDF, Units aware, Units4Excel, VBA
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