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For projects where ACI 318 is used, what's the most common method of concrete mix designs these days for typical concrete mixtures....statistical analysis based on field test results or trial mixtures?

When strength design of masonry was adopted in the 1994 UBC, one of the sub-sections dealt with design of moment-resisting wall frames. The 2000 IBC also had provisions for masonry moment resisting wall frames in Sec 2108, albeit the 99 MSJC Code and Specs which it referenced did not yet have...

When reviewing a WPS submittal that is based on qualification testing per D1.1, D1.1 or D1.4, is it common practice to also review the supporting PQR?

I'd appreciate some information on available seminars dealing with IBC Structural Observations as well as online courses. Has any organization or individual published an authoritative concise manual for SO practice?

In your neck of the woods, do these firms typically engage in special inspection of structural materials(concrete, masonry, steel) per IBC Chapter 17?