The shape and size of the piers are also important. Therefore, the number of piers should be reduced and the span length increased. It is not recommended to place many piers with short span lengths. A range of 20 to 50 metres for PSC I-Girder and 30 to 60 metres for incremental launched box girders bridges are recommended. It is also preferable to have an uneven number of spans from the architectural point of view. The more uniform the span distribution, the more economical the bridge. For segmental concrete bridges uniformity of the span lengths is critical in order to maximize the benefit of pre-casting the segments. It is also important to know the soil condition and landscapes (e.g., over water, land, valley, or mountainous area). A bridge crossing over a navigable waterway is very much dictated by the horizontal and vertical clearance required. Note: For any query write to 2.0 General The span arrangement and configuration should be closely studied first in respect of the site location of the bridge. The values in 'Red Color' are Design Input Data by the User. The design is complete for Pre-stressing cables, End anchorages, un-tensioned reinforcements, End cross girder, Shear connectors. The Shrinkage strain, Creep Strain and effect of Temperature rise and fall are also determined.
The Design of PSC I-Girders is done for Bending moments and Shear forces by Dead Load, Super Imposed Dead Load (SIDL) and Live Loads (LL). By using AASHTO-LRFD Standard, the design of deck slab and Cantilever Slab are done by calculating bending moments, shear forces, bending resistance in transverse direction, bending resistance in longitudinal direction, checking flexural cracking.
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