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hi guys, got busy the last few months. well, my colleague asked me for my opinion and I advised him to do a quick revision of reinforcement details to conform with ACI 318 chap 21 code and project requirements. he dont have enough time to perform a quick redesign of the structure since it was...

A colleague of mine designed a concrete OMRF in a High Seismic Risk area. As ACI code requirement, it should have been a SMRF (this requirement was overlooked, his previous designs were all in very low seismic areas). The designed OMRF structure obviously resulted to a massive structure since...

dik, ive got my new S16-01, most of torsional-flexural requirements for compression members are applicable only to asymetric, singly symmetric and cruciform sections which are rarely used compared with standard rolled sections. kbarnett, that formula you wrote is from AISC360-05 and the results...

still waiting for my copy of S16-01, i still dont expect it contains the information i need. its not in 3rd to 6th edition of CISC handbook either. i think im going to mail the code committee (once i get their address).

i am developing a program for steel design using CISC/CSA16.1-94. It is almost complete except that I could not find any formula to calculate Lu (limiting unbraced length) this is equivalent to "Lp" of AISC 360-05, (Lp values from AISC 360-05 are too conservative). I tried the iteration...

I am evaluating an existing building in Canada and I encountered steel shapes that I could not find in any available references. not even in 1934 AISC, old CISC handbook etc. the beam shapes are mostly 27I160, 27I145, 27I101, etc. (note that I/S shapes commonly comes up to 24" only, even in...

hi all, just a thought; i am not in the US, so i am not concerned with OSHA. but as a thought, ive been working on many projects (all outside US) and 2-bolt configuration is very common, which in design can be modelled as PR base or even conservatively as pin base (at least in one plane). one...

hi, i am preparing a design specification/criteria for our new project. for shielding effect of multi-frame structures (e.g., a very long piperack), i am looking for a shielding effect formula to be applied. i was away from design work for 8 years. i remember using the shielding effect formula...

i forgot to mention this; i was referring to silo legs with no braces, case where bulk carriers are loading underneath and other equipment installations that prohibits braces. one of my previous design (1990) was a 450 MT fly ash silo on 15m legs, no braces, 2-75mm dia. x 1.4m anchor bolts (2...

The configuration does matter by a greater degree. changing from 4 bolts to 2 bolts would demand a redesign of silo leg and the foundation pedestal/footing. While 4 bolts can be assumed as a FR base, 2 bolts would mean a low PR base (depending on how you arrange the bolt configuration). the K...

AISC 303-05 Section 4.2, 4.4 & 4.5 clearly specifies the need for shop drawings. Unless there are specific provisions contained in the contract documents, AISC CP governs, even in the absence of this provision in the contract (except for metal joists & metal building systems). The role of the...

@zcp yes, there are shop drawings that produces good buildings. i once was responsible for checking 7000 tons of structural steel with the guarantee that any errors in fabrication (resulting from bad shop drawings) will be fully shouldered by our department. the project was completed with only...

i dont see any shortage of civil engineers, and would agree to some posters above. what is lacking is the technical skills, i am in my mid-30s and each year i see less qualified engineers entering the workforce, some technicians are much better than them. another factor is the salary and...

A36 generally refers to Carbon structural steel, this could not be directly comparable to A307 which is for steel bolts and studs, each has different manufacturing processes and that metallurgical properties are slightly different. an A36 steel can be threaded to make a bolt (irregardles of...