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  1. Son of a Bridge

    Prestress Losses for PT Column Rods

    Hello, Which design code is typically used to calculate prestress losses for PT rods? From what ive seen, AASHTO (5.9) provides equations to calculate prestress losses for prestressing strands. However, I am unsure if these equations can be used for PT rods? Or do designers typically assume an...
  2. Son of a Bridge

    Temperature Force Single Span

    Hello guys, I am trying to calculate the temperature force for an abutment supporting steel girders (single span bridge). Elastomeric bearings (expansion) will be used at Abut 1. Fixed bearings will be used at Abut 2. Questions: How is the temperature force calculated at Abut 2 since the...
  3. Son of a Bridge

    Substructure Analysis of Pier Cap and Column: Factor of Reduced Moment of Inertia

    Does AASHTO specify criteria for reducing moment of inertia when calculating deflections (cracked section properties) for elastic or inelastic analysis? I know ACI 318-14 Table 6.6.3.1.1(a) permits 0.70Ig for columns and 0.35Ig for beams but not sure about AASHTO. Also, how do designers...
  4. Son of a Bridge

    Transverse Loading Positions for Max Live Load Effects in Pier Cap

    Hello everyone, I am trying to understand how a truck and lane load are positioned transversely along a bridge for one-lane loaded, two-lanes loaded, three, etc. As per AASHTO, "Both the design lanes and the 10 ft loaded width in each lane shall be positioned to produce extreme force effects...
  5. Son of a Bridge

    Lateral Deflection of Retaining Wall

    Is there an equation (or any reference material) that determines the maximum lateral deflection at the top of a retaining wall (due live load surcharge and horizontal earth pressure)? Not sure if I can use the deflection equations for a cantilever beam from AISC Table 3-23 due to the soil...
  6. Son of a Bridge

    Slab Weight Calculation on Flared Girder

    Hello everyone, I am trying to create a spreadsheet that calculates DC loads for bridges. However, I do not know how software programs calculate the slab weight on flared girders. I have attached an image to see if anyone has a general idea of how to calculate the slab weight on the flared...

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