Good to see that API 22nd Edition has clarified as to what AISC manual of construction to be used for WSD design of open sections i.e AISC 335-89 and not AISC 360-10. Their statement that AISC 369-10 is not to be used for design substantiation would imply that do not recoomend it for LRFD design...
Have asked STAAD as to how or what Cm values are used when calculating BETA1 factors used in code checking to AISC LRFD (For API LRFD code check, cm values can be input manually as for the 9th edition code check), - As yet no response from STAAD (3 weeks now). I assunme that cm values are...
Many thanks JAE - Thus for symmetric members you do not have to also design check using the 14th edition equation H2-1 where as in the 9th edition, use must use both equations H1-1 and H1-2
For combined member capacities the 14th Edition uses Eq H1-1a nd 1b but no limiting equation as per the 9th Edition i.e Eq H1-2. Checking some columns that have H1-1a < 1.0 but reviewing capacities based on combined stress gives a resultant stress exceding Yield. Structure is a no sway frame...
Firai
Agree - with my manual checks I get a UR much different from STAAD code check. Also UR's calculated by STAAD code to the 9th Edition and 360-05 differ widly. e.g STAAD 360-05 code check fails the member whilst STAAD 9th EDition code check passes the member. Results are with STAAD but as...
I am looking for a stand alone software package that can check beam elemnts to AISC (WSD & LRFD) and particularly fabricated box sections with slender elemnts. e.g web h/tw = 120 flange b/tf = 55. I have used STAAD for a code check but my hand calcs give a different IR. Would like to do a third...
The adage that "If it looks right, it is right" nowadays probably means that it has not been designed and/or comply with some (if not all) clauses of the new codes.
Trac
I use both RISA 3D and MIDASGEN and highly recommend both. RISA is the ultimate in user friendliness for general structural analysis and design although Report outputs/presentation could be improved. For more refined structural analysis such as time history MIDASGEN is also excellent. Learning...
For a new build steel structure - is there a hierarchal structure when using/referencing building codes/specfications e.g. First apply IBC (UBC?)rules then AISC and/or ASCE seismic provisions then FEMA specifications and finally NEHRP guidelines or are they generally equal in application as...
I am not sure as to what FEMA documnts I should be conversant with for new building design. Is there a priority in the FEMA regs e.g. Can I use 450 alone or do I need to refer to other FEMA documents as well e.g. 302, 350, 357 etc. Some of the FEMA documents appear to have the same content but...
Just some observations/comments-
I was told that even up to the 60’s, a Canadian fabricator (Montréal based I think) still used rivets for shop fabrications, as in some cases riveting was more economical than either welding or bolting.
I am not aware of any major problems with riveted...
Anyone who is using RISA like me, must be amazed by how easy it is to build/modify/manipulate structural models not only for beam element structures but also for basic plate element structures. As I would like to analyse more sophisticated brick element models e.g. lifting lugs structural steel...
The Offshore code of practice - Recommended Practice for Planning, Designing and Constructing API RP2A-WSD
Fixed Offshore Platforms – Working Stress Design, refers to a load factor of 2 when designing a structure for a lift condition.
regards
Trac
Having recently researched the issue of fastener integrity and was surprised how little logical information is available (compared to welding integrity)- I did come across this extract apertaining to use of Jam/Lock Nuts
LOCK NUT
There are two common usage’s of this term:
1. A nut which...
