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While reviewing an elevated roadway supported on pile caps at 12m centers we noticed that the pile diameter was too high for the loads on this roadway. During our value engineering exercise, we were told that the critical load case was a truck breaking and, since the designer has provided joints at each pile cap, the whole breaking force was supported by a single pile cap, thus resulting in a heavy moment on the piles.
We combined five spans together and provided joints every 60m. This way, the breaking force was distributed on 5 spans and the framing action of these connected bays produced further reduction from the cantilever condition. Accordingly, the piling requirement was reduced to one fourth the initial design.