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Why is creep a major concern in balanced cantilever method?

In a balanced cantilever method, the moment is balanced along the length of the piers. However, along the extended cantilevers only a part of the negative bending moment is balanced by prestressing bending moment arising from normal force induced by prestressing. As such, it results in large deflections induced by concrete creep. These partly unbalanced permanent loads generate creep which produces an unexpected and unevaluated hyperstatic effect. In fact, the compressive stresses are very high in the lower slab while they are very low in the upper slab of bridges.







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