Author Archives: dougaj4

2010 in review

Posted on 02/01/2011 by dougaj4

The stats helper monkeys at WordPress.com mulled over how this blog did in 2010, and here’s a high level summary of its overall blog health: The Blog-Health-o-Meter™ reads Wow. Crunchy numbers The Louvre Museum has 8.5 million visitors per year. … Continue reading →

Posted in Computing - general | Tagged | Leave a comment

Buckling of rings and arches

Posted on 01/01/2011 by dougaj4

In 2007 I wrote a paper on buckling of confined steel tunnel liners for the ANZ Geomechanics Conference in Brisbane, and in the course of that I noticed that the calculated buckling load of an unconstrained pipe subject to uniform radial load was significantly … Continue reading →

Posted in Arch structures, Beam Bending, Excel, Newton, VBA | Tagged , , , | 15 Comments

Salutary pictures for bridge engineers

Posted on 29/12/2010 by dougaj4

Following the Minnesota bridge collapse, Time magazine published photos of the ten worst bridge collapses of the last 100 years: The Worst Bridge Collapses in the Past 100 Years An interesting list, many of which I hadn’t heard of, although … Continue reading →

Posted in Historic Bridges, Newton | Tagged , | 2 Comments

ULS design of reinforced concrete, AS, ACI and European codes

Posted on 21/12/2010 by dougaj4

The previous post in this series compared the results of current and previous Australian Standards, and the ACI 318 code, for the ultimate bending capacity of a rectangular reinforced concrete section, subject to combined bending and axial load.  I have now extended … Continue reading →

Posted in Beam Bending, Concrete, Excel, Newton, UDFs | Tagged , , , , , , , , | 1 Comment

Charting a Mathematical Function with Defined Names

Posted on 15/12/2010 by dougaj4

This post is a compilation of information from Stephen Bullen, Jan Karel Pieterse, and George Lungu.  To quote JKP “When doing mathematics, wouldn’t it be nice if we could type an equation into a cell in Excel and immediately see … Continue reading →

Posted in Arrays, Charts, Excel, Maths | Tagged , , , , | 7 Comments