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  1. smjohns78

    Weld Fatigue

    I agree with bridgebuster. If you are looking for infinte life then yes, you are limited to 10ksi. In bridge design, you typically would not have a connection detail as you are describing or at least it would tend to not be heavily loaded so that this would not be an issue. Incidentally, this...
  2. smjohns78

    AASHTO 2010 R-Factors

    I am trying to study for the SE and the examples and commentary I am finding don't seem to be consistent with each other and have confused me as to the intent of the code. I am hoping that someone might have some insight to the use of R-Factors Based on the examples and AASHTO 2010 my...
  3. smjohns78

    AASHTO LFD for tension members

    If you can reference a newer version of AASHTO like 2008 or 2010 it is spelled out a little better.
  4. smjohns78

    Web opening in built up steel beams

    dheger: Thanks for the response. You are right, it is always good to understand the origin of the equations in any reference you use. It seems like the equations are based on plastic design. The way they use "e" seems to account for the reduction in the plastic section modulus Z. For...
  5. smjohns78

    Web opening in built up steel beams

    Sorry if this is posted elsewhere, but I have a question regarding AISC DG2. This references seems to be written for doubly symmetric wide flange shapes. The term for the eccentricity of the hole, "e", seems to be based on the distance from the neutral axis of the nonperforated beam. If I had...
  6. smjohns78

    3D Strut and Tie

    Thanks for taking the time to respond. I'm not sure I can justify the assumption that there is no moment transfer as the piles will be built integrally with the cap and there is only a single line of piles. At the moment I am just considering modeling the cap using a space truss that matches...
  7. smjohns78

    3D Strut and Tie

    I am currently working on the design of a pile cap that is supporting a wall pier. I have been given the reactions at the top of the piles and am working to design the reinforcement in the cap. The reactions include forces and moments in all degrees of freedom. Per AASHTO, the design for...
  8. smjohns78

    Multiple Support Time Histories

    Is it possible in SAP2000 v11 to define a different Time History function at each support in a model? For example if I was modeling a long structure and I had one excitation for one end of my structure and another excitation for the opposite end. If this is possible, how would one go about...

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