Structural Engineering & Statics
where the load goes
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Which failure arrives first — page 22

Essays 505 to 505 of 505 on this thread, in the same order.
The overlap rule is close to Haringx with its shear left whole. The load that a laminated bearing 600 mm across with twenty 10 mm layers can hold, in MN, at displacements of 0.2, 0.5 and 0.8 of its diameter. By the overlap rule, 8.3, 4.4 and 1.2. By Haringx's load with the overlap's bending and the whole shear, 7.6, 3.3 and 0.6. With the overlap's bending and shear, 6.6, 2.1 and 0.2. Followed along a push, in the two-spring model with bending following the overlap, 5.6, 1.5 and 0.2. It carries 4.0 in service, dotted. Stability

The bearing is not a smaller bearing

An isolated building's bearings work displaced, sheared sideways by a large share of their own width, and the top plate then sits over only a lens of the bottom one. Design reduces the buckling load in proportion to the lens's area, which sounds like treating the bearing as a smaller bearing. It is not. Reducing every part of the section to that lens gives half the design rule's load, because the lens's bending stiffness falls far faster than its area. The rule works out close to a different and stranger object: a bearing whose rubber still shears across its whole area, while only its bending has moved to the lens.

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