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RE: Analysis Standards - Nomenclature?[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaoc(--nospam--at)seaoc.org>
- Subject: RE: Analysis Standards - Nomenclature?
- From: "Dennis S. Wish" <wish(--nospam--at)cwia.com>
- Date: Sat, 27 Jun 1998 18:57:09 -0700
Thanks for spending the time to explain your system Kasey. It is very similar to the other comments I have had as well as the methods I use. I like the idea of placing the level before the beam. This way it is easy to sort members by level, then type, and so forth. I substitute CAD overlays for your manual methods, but have not noted loads. When working out the lateral, I break the structure into blocks based upon my grid system. This way I can break the drawing into separate blocks to show which loads are transferred from each side of the diaphragm. If the building is an "H" shape, for example, I break each vertical leg of the "H" into three separate blocks and distribut load to the shearwalls at the horizontal block of the "H". This way I proportion the shear uniformly by stiffness of the diaphragm into each block. If I chose to drag shear into the upper and lower block of the vertical side only, I will have a graphic representation of this to sumit for plan check approval. I also use the cad to determine the actual areas of the blocks for lateral distribution. We still need to discuss how to track loads and reactions. Have any of you using either a spreadsheet or MathCad figured a standard to use where you can tell which member the load applies or the reaction occurs from? I have used a reaction method where I start with B0101 for Beam 1 Reaction 1. The second beam first reaction starts with B0201. If the reaction from the beam continues to the column, the column load to the next member (ftg or beam) becomes C01B0201. Using Kasey's levels this might look like 02B0201 for second level Beam 2 reaction 1. This does not seem too confusing to follow. Any other suggestions? Thanks for the feedback. Dennis Wish PE -----Original Message----- From: K. Hemmatyar [mailto:kch(--nospam--at)ultranet.ca] Sent: Saturday, June 27, 1998 12:55 AM To: seaoc(--nospam--at)seaoc.org Subject: Analysis Standards - Nomenclature? Dennis: >>1. What types of standard's or tracking methods do others use?<< Tacking loads: I copy each floor plan on a 11"x17"transparent sheet (I make sure the drawings are dead on scale.) Then starting from roof (second floor plan) once I complete the framing (and/or roof truss) lay-out on the blue print (the same way Steve Privett described numbered B, beams C columns,... viewed from bottom and right so I know "B-12 R" means right Reaction of B-12) then I lay the 11"x17"transparent sheet of the lower floor over the roof (second floor plan.) There I can see through transparent that which reaction is coming where. If it is a 3 level building I can follow the point loads that are coming down form two levels on a beam (or getting accumulated on the wall) and I appropriately design the member. At the mean time that on each level of my "Mark-up" plan I number the beams, column, etc.. I also write any reaction larger than 3 kips and circle it. This way I make sure as I go to the lower level I transfer this load. At the foundation level I generally have 3 to 4 types of single footing pads. On my foundation plan I show a simple foundation schedule : Footing Size Reinforcing F-24 24"x24x8" 2-15M rebar (or 2#4 USA) each way Bot. F-36 36"x36"x8" 3-15M F-44 44"x44"x10" 4-15M I use (1) Woodwork of Canadian Wood Council (2) our own in-house Spread sheets (3) and another popular software supplied by an American Wood product supplier (I do not mention the name. There are at least 3 or 4 large ones) for the design of laminated beams other than Glulams. When using their software if I do not use their product and just want to specify 2x Built-up lumber beams I have a table that shows Moment and Shear capacity. So I can compare the results and specify the member. I also check the Deflection by verifying the "ExI" product. Since I am using these software I save each file. Therefore I have a directory for year of "1998". Then I have sub-Dir. for each project (i.e. "98026") then every time I have a revision (which happens here in Vancouver 9 out of 10!) I just create another sub-directory under "98026" call it "june_26.98" which simply tell me the date I had revision. I also have a sub-Dir. for "Options" and one for after framing Inspections "frm_insp." Whenever I do a revision I use my latest structural drawing that I produced last and use it for my "Mark-up." This works out well whether I am using CAD or other means. If for instance I am redesigning B-32 I just recall it modify the loading, span, etc. and save it in the new directory. I also keep hard copy of all calcs. in file. Regards Kasey Hemmatyar, P. Eng. (structural) Vancouver, B.C. _______________________message separator_______________ Dennis wrote: We have discussed establishing CAD standards in the past, but I don't think that we have ever talked about uses standards in analysis. Many of us who design large custom home are painfully aware how difficult it can become to track reactions and to assure that all loads are applied to the proper member. Large commercial and industrial structures, for the most part, are rather symetrical and don't have the same level of difficulty as many of the architectural designs found in wood framed projects. Therefore, it becomes much more difficult to track members and loads from top to bottom. I have tried various different ways to track members and loads in my analysis package - the typical B?? for beams, RJ?? For Roof Joist, CJ - ceiling joist, C?? for columns etc. In each case I still tend to lose my load paths and spend a great deal of time tracking reactions that occur from one member which are to be applied to another. I also try to coordinate my member numbers on the plans so that it helps simplify both the plan check cycle as well as later revisions. 1. What types of standard's or tracking methods do others use? 2. Do you use a spreadsheet while laying out loads? If so, do you have a means to sort reactions so that you can track which member they are applied to (other beams, headers, columns or foundations)? 3. Has anyone used a graphic program like Visio or Powerpoint to graphically track loading conditions which are then pasted into an analysis program like MathCad? What other sources are available to simplify setting up an analysis model. 4. How do you establish your member nomenclature priority? 5. Do you use a standard nomenlature to track reactions (ie, B01R01,2,3 - Beam 01 Reaction 01, 02 and 03 for a two-span beam)? 6. How do you number revisions - especially if you need to change the framing in one area of a large structure? This has happened where the architect and owner wished to modify the view from a bedroom and decided to remove a column (gravity and laterally loaded) to join the mitered glass corner for an unobstructed view. I would appreciate hearing from anyone interested so that we might find a standard which would help us organize our design time better. If you know of any commercial software that performs this function, please let me know. Sincerely, Dennis S. Wish PE
- Re: Analysis Standards - Nomenclature?
- From: Steve Privett
- Re: Analysis Standards - Nomenclature?
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- Analysis Standards - Nomenclature?
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