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  1. jrw501

    Allowable Stress Design/Rating of Driven H Piles

    Hi all, I'm looking at an old bridge pier foundation, with a pile cap supported on H-piles. The piles go mostly through sand and are tipped in shale. On the structural capacity side, using allowable stress design, the AASHTO Std. Specs (which I'm less familiar with compared to the LRFD) limit...
  2. jrw501

    AREMA Rocking Effect Question

    Hi all, I just had a general question about the calculation of the AREMA rocking component of impact in beam spans, particularly as shown in an example of John Unsworth's "Design and Construction of Modern Steel Railway Bridges." As shown in the attachment (hopefully), the cross-section in...
  3. jrw501

    Tremie Seal Weight on Piles?

    In the final condition of the bridge with piers in water where they've performed cofferdam construction, would you typically assume that your piles are carrying the weight of the tremie seal ? My tendency would be to conservatively assume the weight of the tremie seal can be transferred...
  4. jrw501

    AASHTO 3.10.9.2 Horizontal Connection Force

    I’m looking at designing anchor rods at a fixed pier of a 3 span continuous bridge (E-F-E-E) to meet AASHTO 3.10.9.2 requirements of the horizontal design connection force of 25% of the vertical reaction due to tributary permanent load and live load assumed to exist during an earthquake...
  5. jrw501

    AASHTO eta factors & deformation

    This is the first project I've worked on with a non-unity factor (eta=1.05/0.95) where I've also been tasked with designing joints and bearings. I think the answer is yes, but thought I'd get some confirmation -- do the eta factors apply to deformations/movement ranges? Thanks!
  6. jrw501

    Thermal Forces, Movements, and Point of Zero Thermal Movement

    Hi all, I'm struggling to find guidance relating to typical assumptions made for thermal force and movement calculations and was hoping to find some references or thoughts/reassurances as they relate to: 1. Design displacements for bearings 2. Design displacements for joints 3...
  7. jrw501

    Theory question (fillet weld loaded perpendicularly to faying surface for a temporary condition)

    Suppose you have a steel box sitting on a steel plate with a force applied at the top perpendicular to the box. The box is heavy enough that the load doesn't cause overturning and the friction force is large enough to prevent sliding. Now suppose you fillet weld the sides of that box to the...
  8. jrw501

    Lever Rule DF Calc Truck Placement

    Hey guys, I had a question about laying out design trucks for DF calculations using the lever rule. The attached picture comes from Barker and Puckett's Design of Highway Bridges, an LRFD Approach. I just wanted to verify that what they are showing violates AASHTO's 2' minimum from the design...
  9. jrw501

    Steel Plate Embedment in Concrete - UBC/IBC min. plate thickness

    Hello, I'm designing a bridge connection that ties a concrete deck to a steel arch below it at the crown (preliminary phase of a project). I plan to embed a steel plate in the underside of the deck, anchored by shear studs (7/8" dia.). The stud plate will be welded to a vertical plate...
  10. jrw501

    Steel Connection Design Reference(s)

    Salmon and Johnson seem to do a pretty good job, but I was wondering if there were any other references you've found useful (papers, books, manuals). I'm an EIT with little background in designing connections and would like to become more competent. Thanks.
  11. jrw501

    A few basic theory questions about buckling

    I'm sure these will be trivial to many of you, but... 1. Will buckling occur in slender columns (steel is probably easier to think about for me as an example, but I guess infinitely well confined concrete or something may work too) even if the column itself is ideal (no imperfections, is plumb...
  12. jrw501

    Stability/Energy Question from ABAQUS output

    For a structure that I believe to have passed its stability point (based on load-deflection behavior that has passed a point with zero tangential stiffness/went through a maximum) can anyone confirm that at that I should be able to verify the stability point has been reached using energy output...
  13. jrw501

    Is it okay to ask for a delayed starting date?

    Hello everyone, I'll be finishing my M.S. in Structural Engineering this semester and preparing to join the workforce when that time comes. Obviously the job market is pretty tough right now with limited new design (although from my perspective the bridge design market and forensics...
  14. jrw501

    Live Load Reduction Clarification/Question

    Hello, I have a quick question regarding live load reductions for columns. The question is similar to the one found here: http://www.eng-tips.com/viewthread.cfm?qid=142628 but I'm not sure I understand what JAE says and I just want to make sure I'm applying this correctly. For a typical...
  15. jrw501

    Mesh Convergence Issue

    Hello, I'm new to FEA/FEM and was wondering if anyone has encountered the following problem with mesh density sensitivity before: For some background, I'm using ABAQUS to model seismic isolation bearings to determine stability/critical behavior at various displacement levels. Anyway, I've...
  16. jrw501

    Elastomeric Isolation Bearings

    Does anyone here have experience designing elastomeric seismic isolation bearings with bolted connections (or doweled) I guess? If so, I was wondering how you go about checking stability at design/maximum displacement levels. For doweled connections you have rollover to consider as well, but I...

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