Structural Engineering: A Very Short Introduction (Very Short Introductions) by David Blockley

Author:David Blockley [Blockley, David]
Language: eng
Format: epub, mobi
ISBN: 9780199671939
Publisher: Oxford University Press
Published: 2014-08-10T00:00:00+00:00

A third possible behaviour of the tower is that the friction between the bricks is so great that the top brick doesn’t slide but eventually starts to rotate about an edge, as shown in Figure 12a. Then as soon as its centre of gravity is poised just over the edge of the lower brick it will topple over, as shown in Figure 12b. Alternatively, if the bond between the bricks is strong enough then the whole tower might rotate about the bottom edge, as shown in Figure 12c. The degree of rotation (and hence the sideways force required) is much smaller for a taller rigid wall, as you can see from the diagram. A fourth possible group of behaviours for the tower is shown in Figure 12d, where the very bottom brick is prevented from rotating and the tower may fall, depending on whether the top one, two, three, four, or more bricks rotate together.

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