FDOT Standard Plans Index 450-199: Prestressed I - Beams Build - Up & Deflection Data

Design Criteria

Design Criteria AASHTO LRFD Bridge Design Specifications ; Structures Detailing Manual ( SDM ) ; Structures Design Guidelines ( SDG )

Design Assumptions and Limitations

Design Assumptions and Limitations Use this standard in conjunction with Indexes 45 0 - 010, 45 0 - 036, 45 0 - 045, 45 0 - 054, 45 0 - 063, 45 0 - 072, 45 0 - 078, 45 0 - 084, 45 0 - 096 and 45 0 - 120. Unless otherwise required as a design parameter, beam camber for computing the theoretical build - up must be based on 120 - day old beam concrete. Consider the effects of horizontal curvature with bridge deck cross slope when determining the minimum theoretical build - up over the tip of the inside flange.

Consider that the vertical curve geometry is along the effective alignment along a chord at the c enterline of the beam, which may be different from the alignment parallel to the Profile Grade Line. For a given size and type of beam, beam camber and associated Dim B and Dim D will vary due to span lengths and beam spacings. Dim B and Dim D will also vary from span to span along the length of a bridge due to deck geometry.

To provide for better aesthet ics and potentially easier detailing of the supporting pedestals, where possible adjust the values of Dim B and Dim D over equal height beams in adjacent spans so as to allow the beam bottom flanges to line up. Dim B and Dim D do not necessarily have to be the same value for a single beam. See the following sketch: Standard Plan s Instructions Topic No.

625 - 010 - 003 Index 450 - 199 Prestressed I - Beams Build - Up & Deflection Data

Payment

Payment Include estimated build - up concrete quantities with the estimated deck concrete quantities. Do not break out estimated build - up concrete quantities. In the absence of more refined calculations, the following method to calculate estimated concrete build - up quantities may be used: For Case 1, 2 & 3: V = LW [ C + ( B + D - 2C 6 ) ] 27 For Case 4: V = LW [ ( B+D 2 ) + ( 2 3 ( C - B+D 2 ) ) ] 27 Where: V = Total Volume of build - up per beam (CY) L = Beam Length (ft) W = Width of beam top flange (ft) B; C; D = Build - up Thickness (ft)

What your plans must show

Plan Content Requirements for this index — the SPI's checklist for designers.

• Complete the following "Build
• - Up and Deflection Data Table for AASHTO Type II and Florida
• - I Beams" and include it on the superstructure detail sheets. See FDM 115 for more information regarding use of Data Tables.