When casting continuous concrete beams it is normal to place construction joints at 1/3 points of the span on the basis that the moment is least there. Are minimum moments really the crucial factor though? Would it not be more prudent to place the joints at the point of minimum shear which would be at midspan? My reasoning is that shear across a poorly bonded day joint would be more dangerous than moment. With a moment the steel deals with the tension and any poor bonding in the compression zone will be improved by the compression.
Just wanted to question a normal procedure. Any thoughts?
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