"... the steel strands 1.1tons, the actual steel weight 8.9tons and miscl.of 2 tons for grout, collars etc.
2430*20/1000+1.1+8.9+2 = 60.6tons."
You likely overestimated re-bar weight. For well design beams rebar to concrete ratio is about 1-1.5%, and for columns around 2.5-3.5%. 4% is a...
What skills and experience you need depends on type of work not on the software you are using. Software is a tool no matter how advanced or easy to use. Just because you can get output in some programs more easily compared to others, doesn't mean the work is done and your design is safe and...
Response to Carlos:
I have been using STAAD Pro for many years, not because I like it, but because I dont have a choice - it is the only structural FE software available were I work. The scenario is common - many companies are offered "a good deal" from Bentley to buy staad licenses. Salesman...
I found this link on Bentley forum:
http://communities.bentley.com/products/structural/structural_analysis___design/b/analysis_and_design_blog/archive/2012/09/05/staad-x-selectseries-2-release.aspx
Apparently they are talking about a "new release" of STAAD(X), but I couldn't find the actual...
Thanks ToadJones - the article covers my case exactly.
...and since you mentioned - step column may not work any more because of high seismic forces due to low R value for OMF. I may use separe crane column and save myself troubles.
Thanks again!
I need help to classify SFRS frame (attached) according to ASCE 7-10 Table 12.2-1.
It is a typical frame for one bay crane building 24m wide, 20m high. Top element is a truss appx. 2m deep. The top and bottom chords of the truss are connected to the step column creating moment in the column...
There is a new edition of Roark's coming out in September. Chk here:
http://www.amazon.com/Roarks-Formulas-Stress-Strain-8th/dp/0071742476/ref=sr_1_1?s=books&ie=UTF8&qid=1312323878&sr=1-1
Combination of Army Technical Manual for preliminary sizing and Roark's Formulas to verify FE results...
"Slabs on Grade have always seemed like black magic to me" - I am in the same boat.
What I found helpful though is making a quick FE model of SOG. Just don't forget to apply loads at the corners and edges of the slab. As expected, results would be very sensitive with respect to the soil modulus...
I recently bought HP15C on e-bay. Probably the best calculator ever. You can check here:
http://www.hpmuseum.org/hp15.htm
I also have new 35s that I like but I don't use any programing capabilities. I think now days that's completely redundant.
There are two different things here. One is a required numerical precision for your work and the other is a internal precision of your computing tool (calculator, slide rule, Mathcad, Excel, Maple, Mathematica, ...).
Just because Mathcad maintains 17-digit precision that doesn't mean your...
In structural engineering 3 significant figures are more than sufficient for almost all type of calculations and to carry the precision throughout calculations. Everything more than that is practically waste of time and money. Actually, it reveals inexperience (better case) or ignorance (worse)...
I worked with SAP, ETABS, AxisVM and Robot. Currently I am using STAAD. So far, my experience is that construction industry (in North America though) doesn't have a good structural analysis software. Let me elaborate.
I think STAAD fails in all aspects (user interface, available elements...
Rayc, you are right, I was looking at plate center stress table and color legend to identify max moments. Plate corner stress table gives the same max moment as you got 1.147 kNm/m.
Since I am doing concrete design manually, I need maximum stresses and forces.
BTW in Axis I used plate...
I am trying to get accustomed with STAAD and I started with simple plate 15 cm thick, dimension 5x5 m fixed on all four sides.
I used concrete for material (E=21700 N/mmsq, Poisson 0.17) and plate has quad division of 10x10.
Results I obtain above supports are not very similar with theoretical...
