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  1. craigmcg

    Seismic Codes and Standards

    Hi all. I recently moved to the US and am trying to get better versed in seismic design using local means and methods. I live in Florida, so unfortunately the local engineers generally know very little in this area. In my research thus far, I've come across many different codes and standards...
  2. craigmcg

    Open Structure Wind Design

    Thanks YS. Our photocopier/scanner is being serviced at the moment so I can't scan anything in. The arched roof data I'm looking for would be similar to Figure 6-8 of ASCE 7-05, except for open structures. The hip roof data would be similar to Figure 6-11C, but again for open structures. I...
  3. craigmcg

    Open Structure Wind Design

    I'm looking to design a canopy-type open structure using either arched trusses or a hip framing for the roof. Neither of these scenarios seem to be covered in ASCE 7-05. Does anybody have any suggestions or other references that may help me determine the wind load distribution? Perhaps the...
  4. craigmcg

    Concrete Footing Reinforcement

    Thanks for everyones input so far. One rule of thought is that multiple layers of reinforcing might be needed to allow sufficient spacing between rebar, else the rebar could get mighty crowded in one mat with a thick slab. However, with components such as footings, it is a good idea to limit...
  5. craigmcg

    Concrete Footing Reinforcement

    Thanks Ron. Always a comfort to have a second opinion.
  6. craigmcg

    Concrete Footing Reinforcement

    I am reviewing some old calculations/design of a 4' thick concrete footing. The design engineer placed their required (As.min) flexural reinforcement (tension/compression) on the top and bottom faces in each direction. This I understand. However, they placed an additional layer of...
  7. craigmcg

    LRFD Philosopy of Sheet Piles

    My biggest problem with designing sheet pile walls with ASD is that the concrete structures they are frequently attached to are designed with LRFD load combinations. Therefore, structures designed using both materials need to be modelled using two different sets of load combinations just to get...
  8. craigmcg

    ASCE 7 LRFD Load Combination Interpretation

    I have a few questions concerning ASCE 7 Clause 2.3.2 - Exception (2). It states: "The load factor on H shall be set equal to zero in combinations (6) and (7) if the structural action due to H counteracts that due to W or E. Where lateral earth pressure provides resistance to structural...
  9. craigmcg

    Battered Pile Retaining Wall Design

    I have a question regarding the design of a batter pile that braces a sheet pile retaining wall through compression. In reviewing a couple designs performed by other engineers, I am tending to disagree with their analysis methodology, which is similar to how a truss is analyzed. This is as...
  10. craigmcg

    Learning FEA and Applications with Concrete

    Hi all, I've spent bits of free time over the past year or so trying to learn what I can about FEA and practical application in structural analysis for civil structures. I haven't spent a great deal of time on in-depth theory just yet, but I plan on taking some night courses once this d*mn...
  11. craigmcg

    Tiebacks

    As long as the soil is properly compacted and settlement isn't an issue, I wouldn't expect the stress increase to be that considerable. Normally a safety factor of 1.3 is incorporated into tieback stresses to account for such residual stresses. If you're really concerned, easiest way might be...
  12. craigmcg

    Multiple stepped sheet pile walls

    Exactly what I was looking for, thanks a lot!
  13. craigmcg

    Multiple stepped sheet pile walls

    I've attached a file that details what I'm asking. The drawing isn't to scale so this is more for theoretical purposes. I hope that someone here can confirm or correct my reasoning... As the image shows, I'm looking at two stepped retaining walls in very close proximity to one another. All...
  14. craigmcg

    Bolt Punching Shear in Steel

    Does anybody have any references for calculating the capacity punching shear/pull-through of a bolt in a relatively thin steel plate? I remember performing the calculation a few years ago but can't seem to remember my source. Thanks.
  15. craigmcg

    Headed Anchors in Concrete

    I have a few questions that I'm hoping some of you may have some insight into. FYI, I'm basing my questions off of ACI 318-05. 1) Imagine that a 12" long anchor is being cast 6" into a slab. A 6" secondary pour is then cast atop the original slab once cured, thus creating a horizontal cold...
  16. craigmcg

    Retaining Wall / Bulkhead Anchor Location

    I have a question regarding the required anchor setback on general retaining walls or bulkheads. Perhaps someone here has some insight. I already know the following: Lets assume an anchored sheet pile bulkhead. The location of a bulkhead anchor must account for two sliding planes to ensure...
  17. craigmcg

    Structools PvsM Software for Prestressed Interaction Diagrams

    I'm looking to purchase some software that will allow me to construct interaction diagrams for prestressed concrete sections. I've found that Structools offers PvsM do do just that. Before I go ahead and purchase it, I thought I'd check to see if anybody has any experience with it? Thanks.
  18. craigmcg

    Glass Fiber Reinforced Concrete

    Thanks everyone for your post. To clarify, I did mean Glass Fiber Reinforced Concrete (GFRC not GFRP). I deal with FRP products frequently so its become a habit in typing. Based on your comments and additional material I've read, I've decided to scrap the GFRC idea and simply use a simple...
  19. craigmcg

    Glass Fiber Reinforced Concrete

    I'm looking to design a concrete slab boat ramp, one that is used to launch/retreive boats in a salt-water marina. Instead of pouring a typically reinforced concrete slab, I was considering using a material such as GFRP. I don't have much experience with this material, and we have no relavent...
  20. craigmcg

    AISC Direct Analysis Method

    That's exactly what I found after digging around a few other forums. I ran one of the benchmark problems and confirmed this as well. I guess I have no other choice but to look at upgrading, its not that I don't want to, just that I have to pitch it to management for the funds...

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