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  1. rwpe

    Prefab Metal Building Steel Strength

    I am involved in verifying the structure of an existing prefab metal building. The building was originally designed as cover structure with open walls. At some point following, walls were added and there appeared to be no retro-fit of the existing frames. For my analysis, I have hit a bump in...
  2. rwpe

    Ferrocement Water Tank

    I am currently designing a water tank per ACI 549.1R. The one question I have is what is the significance of the Specific Surface of Reinforcement (Sr) criteria? In going through the design, I have been able to meet the cracking criteria and the Volume Fraction of Reinforcement (Vf)...
  3. rwpe

    Compression Dowels

    I have a project in which I have designed a concrete vault, completely underground. The walls were designed using a "fixed-end" beam analogy. Therefore, at the support ends of the wall, we have a negative moment where the inside face of the concrete is in the compression region of the beam...
  4. rwpe

    AISC Certification vs. Uncertified and Special Inspections

    Hello all, I'm looking for some advice regarding using AISC certified fabricators vs. Uncertified. This is going to be kind of long, so please bear with me. As I understand it from the IBC 2006, special inspection is required in the steel fabricator's shop unless the fabricator is certified...
  5. rwpe

    Wind Load on an Open structure

    I am currently looking at an open structure for a project. The problem I am having is with the h/L ratio. Per ASCE 7-05, Figure 6-18B, the minimum h/L ratio is 0.25. My structure has an h/L ratio of approximately 0.16. I looked through the ASCE 7, and did not find an alternative way to...
  6. rwpe

    Work by others, non-engineers

    I have seen the post up a number of times, but usually in an instance where another engineer is involved. My question: Is it acceptable to seal and sign the work of non-engineers? To clarify my position, we are typically asked to review drawings, at a residential level, where the drawings were...

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