If cycles are repeated infinitely, the modulus of subgrade reaction of backfill becomes constant. Due to the repeated backfill compaction and soil slide, the modulus of subgrade reaction and the pressure distribution of backfill vary with depth.Ī Cycle is the period from a deck expansion to a deck contraction. Backfill compaction due to a deck expansion and soil slide due to a deck contraction is repeated. Expansion and contraction of the bridge deck affects the backfill soil adjacent to the abutments. The prime concern in integral bridges is the effects of temperature variations on the deformation of bridge deck. An integral bridge is one in which the bridge deck and its supporting abutments and piers are integrated without expansion joints to absorb the deformation of the bridge deck using the flexibility of the abutments and piers. Midas Civil has a function called the Integral Bridge Spring Support. Function Location: Boundary > Spring Supports > Integral Bridge.
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