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  1. johnson2a2t

    Rebar designation - ca 1950

    I did and, so far haven't found anything on the "free" area. It looks like the steel would have been under ASTM A-15 and most information I've gathered so far indicates "intermediate grade" would have had fy=40ksi. I'll keep digging to verify.
  2. johnson2a2t

    Rebar designation - ca 1950

    I'm trying to determine the characteristics of reinforcing steel from a building built around 1952. I have a decent set of drawings, but the note designating the rebar is a little muddled. It looks like the call out is for "intermediate grade with deformations to conform to ASTM a-30E". I'm...
  3. johnson2a2t

    Sheet Metal Box Beam

    We're looking at doing some rehab on a hotel. The exterior walkways appear to consist of composite deck (corrugated steel pans with a 4' slab) with ribs running side-to-side. Some of the walkways, then, have steel tubes on either side to support the walkway. But some, instead, have a sheet...
  4. johnson2a2t

    Minimum Steel Reinforcement in Retaining Wall

    This diverges from this thread a bit, but I noticed the prescriptive design table for concrete foundation walls in IBC 2006 (Table 1805.5(5)) and there's nothing remotely approaching an 18" spacing of rebar. Would a PE be within their standard of care for a client if they specified a wall based...
  5. johnson2a2t

    Minimum Steel Reinforcement in Retaining Wall

    bjb - I think 10.5.4 is only applicable to slabs and footings. But 14.3.5 is for walls - albeit not specifically for retaining walls. I've seen the exemption of 10.5.3 cited in design examples (and in design software) for retaining walls - I've just not seen any documentation why it was...
  6. johnson2a2t

    Minimum Steel Reinforcement in Retaining Wall

    I'm looking for some clarification regarding the exemption for minimum reinforcement given in ACI 318 10.5.3 (allowed where As provided is at least 1/3 greater than required) versus requirements for a minimum spacing of reinforcement steel of 18" in sections 7.6.5 and 14.3.5. This came up in a...
  7. johnson2a2t

    Epoxy-grout rebar in CMU retaining walls

    Is there any guidelines for using epoxy-grouted rebar in CMU retaining walls. Specifically, grouting the vertical reinforcing into the footing.
  8. johnson2a2t

    Load Combinations for Timber Design

    Which load combination from ASCE-07 (05) applies to Timber Design? 2.3.2 or 2.4.1 if either?
  9. johnson2a2t

    Is cmu truly pinned at the base?

    I'm having trouble getting it to work out too (thus my postings!). The way the contractor WANTS it to work is that the pilasters will end low enough so they can build a floor about 9.5' from the top of the wall (where there will be another floor). I've looked at designing the wall to span...
  10. johnson2a2t

    Is cmu truly pinned at the base?

    jmiec, No, it's just a CMU wall (they use 12" retaining wall block). They've been building them up to 20' (for 3-story cabins w/ a footprint of 26' x 42'- the 42' length being the retaining wall). The City's building official finally balked when they started exceeding 20' and asked for...
  11. johnson2a2t

    Is cmu truly pinned at the base?

    jmiec, Yes, at least 24'. The developer is looking at some that could go up to 30'. It's a mountain development with slopes often 1:1 or greater. I've recommended for them to go with reinforced concrete, but the owner/contractor is a bit resistant to change.
  12. johnson2a2t

    Is cmu truly pinned at the base?

    In the case of designing the stem using pinned connections, is it still best to assume a moment transfer at the base for footing design? For example, in the case of a CMU basement wall with a significant soil retention (I'm looking at one now that retains about 24').

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