What is a 'rocker slab'?

Engineering Asked on May 9, 2021

See below for an extract from a general arrangement drawing from the 1980s. It makes reference to a ‘9" rocker slab’ which appears to be a slab supported by steel beams.

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Does anyone have any more information on the construction details of a rocker slab?

One Answer

Found this reference , a white paper from a firm "Moffatand Nichol," which says

Localized areas found between structure and external service yard can be designed as a form of articulation or ‘rocker’ slab, which as the name suggests, allows for normal movements irrespective of on-going settlements. While rocker slabs may be a solution for particular applications, they can never provide an operationally friendly solution for large storage areas or service yards.

My take, skimming some other sites' documents which mention but don't strictly define them, is that a "rocker slab" is a single-cast piece of concrete which rests on supports at both ends (and possibly the sides), thus joining two separate parts of framing. Quite possibly without being bonded in place (as the slab is a preform). Local bolts would be required to anchor the slab.

Correct answer by Carl Witthoft on May 9, 2021

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