Site history


This page is intended to help visitors decide whether something of interest to them might have been loaded since their last visit.


6th June 2018:  Uploaded a new version (2.01) of the Multiple Regression spreadsheet.  Minor changes to documentation only.

3rd May 2018:  Uploaded a new version (4.01) of the Machinery Foundation spreadsheet.  Capabilities slightly expanded.

9th April to 2nd May 2018:  Web site was “down”, due to the combined effect of a minor glitch in some software and a major inattentiveness in me.  My apologies to anyone who was inconvenienced.  I’d like to say it won’t happen again, but I’d probably be lying.

14th March 2018:  Uploaded a new version (3.07) of the Loaded Cable spreadsheet.  Capabilities slightly expanded.

31st October 2017:  Uploaded an attempt to identify the poets and poems being parodied by John Clarke in his brilliant book “The Even More Complete Book of Australian Verse”.

4th October 2017:  Uploaded a major revision (4.00) of the “Dynamic Analysis of Machinery Foundation” spreadsheet.  Main change is the new ability of the user to choose between (roughly) US units or (roughly) metric units.  Quite a few other improvements were incorporated at the same time.

31st August 2017:  Uploaded a new version (1.03) of the Parking Analysis spreadsheet.  Cosmetic changes only, brought about by me having to drink my own Kool-aid.

12th August 2017:  Uploaded a new version (1.02) of the Parking Analysis spreadsheet.  Main change was trapping an error that would occur if the user analysed a development containing dwelling sizes for which no population statistics were available.

17th May 2017:  Uploaded a new version (1.01) of the Parking Analysis spreadsheet.  Main change is that the user can now specify how many individual simulations should be included in an analysis.

20th April 2017:  Added a new spreadsheet that uses Monte‑Carlo simulation to investigate the adequacy (or otherwise) of the on‑site car parking provided by a residential real estate development.

14th January 2017:  Uploaded new versions of several spreadsheets.  See list below.  All the changes are trivial and cosmetic, with none of them affecting any calculated results.
      Interior of an infinite slab on an elastic foundation
      Edge of a semi-infinite slab on an elastic foundation
      Horizontal lifeline cable
      Behaviour of Euler column under short-duration axial compression
      Analysis of reinforced concrete cross-section
      Buckling analysis of a stiffened cylinder under radial pressure
      Dynamic analysis of machinery foundation

27th December 2016:  On about 20th December I was advised by my website hosting service that my site had been maliciously “compromised”, and so had been suspended.  Since that time I have been gradually putting the pieces back together.  I believe that this process has now been completed.

August 2016:  Added a new spreadsheet to investigate (very crudely) the “dynamic buckling” of an Euler column subjected to a short-duration axial compression.

June 2016:  Corrected a minor error in “horizontal lifeline” spreadsheet, where it threw up a host of “divide by zero” errors in its new dynamic analysis worksheet if the value of H was entered as exactly zero.  Embarrassing, eh?

June 2016:  The dynamic analysis worksheet of the “horizontal lifeline” spreadsheet was comprehensively reworked to allow the inclusion of “energy absorbers” in the analysis.

February 2016:  A few minor, purely cosmetic, changes to the “horizontal lifeline” spreadsheet.

January 2016:  The dynamic analysis worksheet of the “horizontal lifeline” spreadsheet was extended to calculate the time duration of the fall and the maximum deceleration force experienced by the falling person.

September 2015:  A new spreadsheet to analyse horizontal lifeline cables was added (as version 1.01).  At the same time a new version of the “Loaded Cable” spreadsheet (version 3.06) was uploaded, reflecting the new-found independence of the “horizontal lifeline” worksheets it had previously contained.

September 2015:  The “Loaded Cable” spreadsheet was updated.  The new version (3.05) now includes a new worksheet that analyses a horizontal cable being used as a lifeline.

August 2015:  The “Loaded Cable” spreadsheet was updated.  The new version (3.04) corrects an error introduced in version 3.03 two months ago.  In 3.03 I had introduced a cosmetic improvement, but had failed to test that it worked when the worksheets were protected (which they normally would be).

July 2015:  The “Analysis of reinforced concrete cross-section” spreadsheet was updated.  The new version (4.00) uses an improved method for specifying the level of prestress, less cumbersome and more flexible.

June 2015:  The “Loaded Cable” spreadsheet was updated.  A new worksheet has been added, one specifically intended to handle situations where the cable is “over-taut”.

May 2015:  I have at last had an opportunity to check my spreadsheets under Excel 2013.  The checking was relatively superficial, but it suggests that none of them have any problems.

May 2015:  Updated the paper about dynamic loadings on pedestrian bridges.  The only change is the inclusion of the derivation of some of the equations presented in the paper.

May 2015:  Added a spreadsheet demonstrating some useful, lesser-known features in Excel.

Feb 2015:  “Multiple regression” spreadsheet made available for the first time.

Feb 2015:  Site restored after about four days of inaccessibility caused by some glitch somewhere.  Late New Year resolution:  I must remember to check accessibility more frequently.

Jan 2015:  The two spreadsheets “Loaded Cable” and “Dynamics of Machinery Foundation” were updated.  Merely some minor cosmetic improvements.

Dec 2014:  Both “slab on elastic foundation” spreadsheets updated.  No computational changes.  Added some extra material to their “Documentation” worksheets.  Some cosmetic improvements.

Sep 2014:  Web site repaired after having been rendered totally inaccessible for about a fortnight.

Jul 2014:  “Dynamics of two degree-of-freedom system” spreadsheet updated.  No computational changes.  Added some additional calculated values to the output.  Added several extra items to the “Documentation” worksheet.  Various cosmetic improvements.

Jun 2014:  “Analysis of reinforced concrete cross-section” spreadsheet updated.  No computational changes.  Added my original rough working notes to the download package.  Added some extra information on the spreadsheet’s use of protection (on the “Documentation” worksheet).

May 2014:  “Loaded Cable” spreadsheet updated.  Changes were cosmetic and informational, not computational.

Nov 2013: 
“Dynamic analysis of machinery foundation” spreadsheet added.
“Private downloads” page created.
Very minor changes made to “Brain function” document.

Oct 2013:  “Buckling analysis of stiffened cylinder” spreadsheet added.

Aug 2013:  “Analysis of reinforced concrete cross-section” spreadsheet updated.  Main change is the addition of a limited ability to model prestress.

Jul 2013:  “Analysis of reinforced concrete cross-section” spreadsheet updated.  Changes were trivial and entirely cosmetic.

Jun 2013:  “Analysis of reinforced concrete cross-section” spreadsheet added.

Feb 2013: 
This “site history” page created.
“Other sites” page created, and (very thinly) populated.

Jan 2013:  “Dynamics of two degree-of-freedom system” spreadsheet added.

Nov 2012:  Site created.