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  • Users: srbu
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  1. srbu

    PEMB spread footings

    Thanks for the responses. Drilled piers are not an option here. I'm going to talk with the PEMB manufacturer to see if the column can be extended down to grade. If this is not a possibility than I will go with the tie beam. Unfortunately, there are headroom issues in the trailer bay so I...
  2. srbu

    PEMB spread footings

    I'm working on the foundation design for a 130' span PEMB with 30' bay spacings. Allowable Bearing Capacity = 4 KSF. At column line A the columns are 4' above finished grade and at column line B the columns are 13' above finished grade. Bottom of footings are 5' below grade. The max...
  3. srbu

    LRFD - Bridge Deck Overhang Design

    I am currently working on a bridge deck overhang design using the LRFD code. For the design case of the vehicular collision plus the dead load moment acting concurrently with the axial tension from the vehicular collision, do I need to reduce the nominal moment capacity of the deck because of...
  4. srbu

    Rating Prestressed Concrete Bridges

    Thanks yakpol. Everything makes sense now.
  5. srbu

    Rating Prestressed Concrete Bridges

    I am currently working on my first bridge rating of a simple span precast/prestressed concrete bridge. I am wondering how to apply S, the unfactored prestress secondary moment, to the rating equation RF= (?R - (1.3D+S))/(2.17L(1+I)) found in Article 6.6.3.3 of the 1994 AASHTO Manual for...
  6. srbu

    Advice needed

    I am currently working on a project in which part of the work requires shielding to be installed on the bottom flanges of bridge girders in selected areas. I have gone through all the information that my Project Manager has and was not able to find the girder spacings/lengths and the beam...
  7. srbu

    Calculation reviews

    I would like to thank all of you for your responses. They were of great help to me and further confirmed for me what I already thought was the right thing to do. I talked to my PM and told him I didn't feel comfortable signing them and he was understanding about it.(Sorry DaveViking, it didn't...
  8. srbu

    Calculation reviews

    I have been told to check some structural calculations of some minor, but important, parts of a project my firm is currently working on. After I checked the calculations my PM handed them back to me and asked me to sign and date the cover sheet as the sole reviewer. This is where I have a...

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