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  1. dabbler101

    Loading Conditions

    I have checked all of these codes... and I'm still not sure. I understand that designing for a 10 year flood is on the lower end of the spectrum but the Massachusetts Highway Department was very clear about the design criteria in the scope of work. On top of that, we are holding the low chord...
  2. dabbler101

    Loading Conditions

    I'm currently working on an abutment design for a single span bridge on rural road in western Massachusetts. I am planning on looking at all applicable load combinations for two loading cases. For the first case I would consider a 10 year flood condition and for the second case I would...
  3. dabbler101

    Rib Shortening

    In the AASHTO load factor design load combinations IV, V, VI there is a term (R + S + T), the R is defined as Rib Shortening. I have a good handle on S & T, but am unsure of what rib shortening is... can someone explain to me in what type of structure one would have to consider this effect...
  4. dabbler101

    AASHTO Division I Sec. 3.15.3 Overturning Forces

    Thank you much, that's very helpful...
  5. dabbler101

    AASHTO Division I Sec. 3.15.3 Overturning Forces

    Can someone help explain this section to me? I'm working on a 100' long single span bridge... Is this section pertinent to developing overturning forces on an abutment? The way I interpret the section is that for a simple span design this force will counter act some of the dead load of the...
  6. dabbler101

    Vertical Component of Equivalent Fluid Pressure on Footing

    I'm currently working on an abutment design for a bridge out in Lee, MA. In a couple of my load conditions the water table is above the top of footing. Basically, the abutment footing is 3' thick; there is 5' of saturated soil above the footing, then 2' of dry soil above that. The geotech...
  7. dabbler101

    top of water above low beam elevation

    There is an 8" gravity sewer main that crosses the bridge, the highway department does not want to get into a large sewer main replacement project and they do not want to add pumps. There are two other utilities on the bridge as well, including gas and water. Because of the existence of...
  8. dabbler101

    top of water above low beam elevation

    Hello all, I am currently working on some preliminary design calculations for a bridge in Lee, MA that spans over the Housatonic River. The design span is 100', and the cross section is composed of (6) 48" deep spread box beams. Unfortunately, due to several site constraints, the bottoms of...

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