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  • Users: MichSt
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  1. MichSt

    Force envelope command at a section

    I have modeled a bridge girder in staad and placed intermediate sections along my beam elements to obtain results at 10th points along each span. Is it possible to print a force envelope for the intermediate sections?? If so, what command is used for this in the input file?? Thanks
  2. MichSt

    Kicker Beam Design

    The bridge I’m working on has a radius on the off end to allow traffic to turn off the bridge. A kicker beam will be used at the end of the bridge to carry the additional deck required for the radius. The main fascia girder the kicker will frame into is a two span continuous steel girder and...
  3. MichSt

    Max Deflection without Horizontal Curve

    This does not seem to be covered in AASHTO, but I’ve seen two equations used to determine the max deflection that can be used without a horizontal curve: 1. arctan(1/design speed) 2. arctan(60/design speed^2) What is the appropriate criteria & reference to use for this situation? My...
  4. MichSt

    Rail bridge bearing replacement

    I am working on a rail bridge bearing replacement project and will be attaching new steel sole plates to the existing 1890’s riveted steel plate girders as part of the work. I plan to attach using countersunk high strength bolts since the sloe plate will sit on new electrometric bearings...
  5. MichSt

    Formwork design: Lateral coefficient

    What is a typical lateral coefficient used for wet normal weight concrete in formwork design?
  6. MichSt

    Continuous RC beam û clear span considerations

    I’d like to know how to determine the design moments in a continuous reinforced concrete beam when the clear span between supports is less than the span used in the beam analysis. For the negative moments, taking the design moment as the moment at the face of the support is typically done to...
  7. MichSt

    Bridge collapse near Pittsburg, PA

    Below are a few articles with photos of a bridge collapse near Pittsburg, PA. The bridge is an adjacent concrete box beam bridge carrying a local road over I-70. From the photos it looks like one of the fascia beams carrying the railing failed at midspan and collapsed. Luckily, the beam...
  8. MichSt

    Concrete topping reinforcement

    I’m working on the design of a single span adjacent prestressed concrete box beam bridge with a composite concrete topping/deck and I’d like to know if there are any procedures to calculate the amount of transverse and horizontal reinforcement needed in the topping. Or do you just provide...

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