Found on the Web:
Edit 26 Feb 2023: Link no longer active
ELASTIC SOLUTIONS FOR SOIL AND ROCK MECHANICS
“Professor Harry Poulos, Emeritus Professor from the University of Sydney and a Senior Principal Consultant with Coffey & Partners, has graciously (and generously) agreed to allow USUCGER to post a PDF version of the seminal book Elastic Solutions for Soil and Rock Mechanics (co-authored with the late E.H. Davis). “
The picture indexing spreadsheet presented in the previous post has been updated:
Download from PastePic.zip
Notes:
Screen shot
Back from my holidays, with a hard disk full of holiday snaps, and looking for a program to extract the image data saved on the camera, and add comments. Not liking the offerings provided with the cameras, or any of the free programs I found, I have written my own, using ImageMagick.
ImageMagick is a command line image manipulation program, which has COM+ component, allowing the program functionality to be accessed from VBA. More details here: ImageMagick COM+ object
My image importer program can be downloded from: PastePic.zip, and screenshots are shown below.
To run the program you will need to download and install the ImageMagick software, then in the Visual Basic editor create a reference to the ImageMagickObject 1.0 Type Library, using the Tools-References menu.
The spreadsheet file has only been provided in Excel 2007 format because in earlier versions the file size becomes impracticably large with only a small number of images.
File input list
Imported thumbnails and file details
The wonderful Willoughby Symphony Choir give an impromptu performance of Motzart’s Ave Verum at the Dom Cathedral in Salzburg. Use headphones or good external speakers to get the full effect!
Is the arch in the picture below stable, or has it been created in Photoshop, or perhaps with the assistance of some glue or external straps?
Book Arch
A simple analysis suggests that tension will be generated at the bottom of the crown, and at the tops of the columns, suggesting that the books would not be stable in this configuration without some reinforcement.
Analysis 1
But looking at the problem from a geometric perspective, it is possible to fit a catenary within the shape of the arch, and the structure should therefore be stable:
Catenary
A slightly more detailed analysis, allowing the arch segments to separate rather than develop tension suggests that the structure would be able to develop a compressive path to carry the gravity loads to the base.
Analysis 2
The stability of structures is not always obvious. The ray tracings below from, PM 2ring, show two different types of “pseudo arch”, which are both stable, if correctly configured:
Cantilever
