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Recent content by ernestog84

  1. ernestog84

    AASHTO Girder Moment and Shear Distribution Factors

    I don't have an software suggestions, but it shouldn't take more than an afternoon to set up your own spreadsheet to calculate these factors, similar to the time it takes to familiarize yourself to new software.
  2. ernestog84

    AASHTO Girder Moment and Shear Distribution Factors

    The HL-93 live load is a combination of the lane load AND the design truck/tandem load at the position of greatest load. You must determine which has a greater load for that bridge, a design truck or a design tandem. For a simply supported span, see the following site for a tabulation of all...
  3. ernestog84

    Staggered cross frames in skewed bridges

    Does the DOT have a preferred detail or preferred crossframe layout?
  4. ernestog84

    Staggered cross frames in skewed bridges

    Refer to the FHWA Steel Bridge Design Handbook Vol 13 "Bracing System Design". Staggered cross frames are discussed and refutes the DOT Reviewer on the fatigue cracks. https://www.fhwa.dot.gov/bridge/steel/pubs/hif16002/ If this fails, you should ask for a source for his statement.
  5. ernestog84

    Shear Strength Provided by Web Reinforcement, old (LFD) AASHTO vs LRFD AASHTO

    I've never used LFD, but try comparing the Load from LFD vs LRFD and see if you get a similar difference.
  6. ernestog84

    AASHTO LRFD7 Temp and Shrinkage Steel

    "Each face" means the outside part of the concrete, the perimeter (top, bottom, left, and right), NOT the middle core. The steel will be on the outer part of the beam. Each direction means vertical and horizontal. So on the top and bottom, the flexure steel controls, and on the sides the...
  7. ernestog84

    LLDF

    I don't understand, why wouldn't you use the LLDF equations from the AASHTO LRFD?
  8. ernestog84

    Caltrans Bridge Design Practice Chapter 21 Abutment Shear key design

    That example is lacking several figures to help visualize the problem. I took a look in the Seismic Design Criteria (where the equation is being pulled from) and it is also not very clear. [banghead]
  9. ernestog84

    LRFD Reinforced Concrete pipe design question

    The Concrete Pipe Association has resources on this. The design manual: http://www.concretepipe.org/pipe-box-resources/design/design-manual/ There are a couple of examples, based on embankment/trench and soil type. There is also a design chart in the appendixx for embankments to save you the...
  10. ernestog84

    Plastic neutral Axis of HSS round pipe filled with concrete

    This is covered in AISC Design Examples v14.1 AISC Design Examples Look on Page I-6. Every step is laid out for you.
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