Detailed example showing sample calculations for design of typical Interior AASHTO Type–IV prestressed concrete Beam supporting single span bridge. The design is based on AASHTO LRFD Bridge Design Specifications 3rd Edition 2004.
The bridge considered for design has a span length of 110 ft. (c/c pier distance) with no skew and a total width of 46 ft. The bridge superstructure consists of 6 AASHTO Type IV beams spaced 8 ft. center to center designed to act compositely with 8 in. thick cast in place concrete deck as shown in figure A.2.2.1. The wearing surface thickness is 1.5 in. which includes the thickness of any future wearing surface. T501 type rails are considered in the design. HL-93 is the design live load. The relative humidity of 60% is considered in the design. The bridge cross section is shown in fig A.2.2.1.