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  1. marinaman

    Minimum Reinforcing for Large Concrete Pier in the Ground

    I have a situation where I will need a concrete pier to support a primary building column, (4) small tube columns (to brace architectural cladding), and to support veneer that wraps the columns, all at the same time. The loads are small. Column load is around 100 kips (dead and live). No...
  2. marinaman

    Beam to Column Eccentricity in Column Analysis

    Thank you guys very much. Kootk, thank you for the link. In my youth, the folks I worked for ignored the column eccentricity alot, but, we mainly designed 1-2 story steel framed buildings. Flash forward 30 years. I include the eccentricity, but, I've heard it argued otherwise. I'm always...
  3. marinaman

    Beam to Column Eccentricity in Column Analysis

    If you guys have a multi-story steel framed building, in your column design, do you include connection eccentricity in the analysis of the column? For example, if I have W12 columns, the connection eccentricity to the column centerline would be roughly 6", each side, in the strong direction and...
  4. marinaman

    Retaining Wall Multiple Loading Conditions

    If sliding is the primary issue, then I would consider placing a grid of grade beams on the low side . You could create a grid of grade beams. For example, they might be 8' o.c. and be 36" wide and 16" thick, each. Each might could be oriented perpendicular to the footing of the retaining...
  5. marinaman

    Wind Pressure - Wall Inside of and Open Building

    I'm trying to calculate the wind pressure on a wall inside of an open building. The building is a single story car repair shop. The building is 200' long and 80' wide. It has roll-up garage doors on both sides, all the way down the 200' long length of the building. The owner wants me to...
  6. marinaman

    Anchor Bolt Number and Size for Erection

    Sadly, this osha requirement falls well short of what is actually needed in the field.....thus my question. The eccentricity provided by the osha report is only half the column size, plus 18".....times 300 lbs. Assuming a W12 column, that's only 2' x 300lbs....or a moment of only 0.6...
  7. marinaman

    Anchor Bolt Number and Size for Erection

    What is a good rule of thumb for the number and size of anchorbolts for use in erecting steel columns? I have a building that is (3) story. The gravity columns will only be subject to downward gravity forces, except during erection. Is there a rule of thumb regarding the size and number...
  8. marinaman

    Braced Frame Spread Footings

    driftlimiter's comment is where my confusion is coming from. The 1.5 Factor of Safety v/s overturning is a common comment among the more experienced guys in the office, but the younger guys tell me that its 0.6D = 0.7E and that the 0.6 is the old 1.5 Factor of Safety. I think when using the...
  9. marinaman

    Braced Frame Spread Footings

    I hope by asking this question, it may lend clarity to all: Braced frame footing design is not clearly defined anywhere that I can find. I have looked in the AISC design guides, in ASCE 7, in numerous foundation design books and guides that I have, on the internet, and within this forum. I...
  10. marinaman

    Deflection Limits of Composite Floor Systems

    I have a question regarding composite steel framed floors. We have guidance in the code and AISC regarding individual member deflections, but I do not see anything about system deflections. Here’s what I mean: Let’s say we have a composite floor on a 30’ x 30’ grid. If the beams and girders...
  11. marinaman

    Electronic Note Pad

    Thank you guys for all of your input. I really like the remarkable 2, but, I will not buy it if I can not operate it without a subscription. Ideally, I would: - Take notes at a meeting or do hand calculations - Save them as pdfs - Take them to my desktop via a USB thumb drive and store...
  12. marinaman

    Electronic Note Pad

    I am thinking of going paperless. I am a structural engineer that designs and provides analysis of existing buildings. I often times am completing hand calculations. Often, I will knock out a hand calculation for a beam, or column, or a footing, or something like that. I may sketch the...
  13. marinaman

    3/4" Wood Allowable Stress

    Thank you SlideRuleEra!! That's exactly what I needed!!
  14. marinaman

    3/4" Wood Allowable Stress

    SRCELL - The supplement does have data for species and sections....but not for 3/4" thick materials. That is my issue. Unless, of course, I'm totally overlooking something?
  15. marinaman

    3/4" Wood Allowable Stress

    In looking thru the NDS, I do not see any data regarding the use of 3/4" thick wood boards (1x's) I am looking at an existing building that has 1x6 wood used as the subfloor. The wood is southern yellow pine and spans 24". I'm trying to determine what the live load capacity for a 1x spanning...
  16. marinaman

    Library Floor Deflections

    Thanks for all the input. I went back and reviewed the composite deck itself. Turns out, to get deflection results that were acceptable to me for library loading, of just the deck, I had to thicken the slab to 6 1/4" (4 1/4" lightweight over 2" composite metal deck) and, I closed my beam...
  17. marinaman

    Library Floor Deflections

    Thank you guys for all of your input. Very much appreciated. I've studied these members pretty hard, here in the last couple days. My spans aren't terrible.....but aren't short either. My beam spans are from 28' to about 32' in length, with beam spacings in the 8' to 10' range. I've tried...
  18. marinaman

    Library Floor Deflections

    I am designing a library for one of my clients. The building will be steel framed with a composite floor system. Given this building is a library.......how do you guys feel about what an allowable floor deflection might be? If I set my live load deflection to L/360....and my overall...
  19. marinaman

    Beam Unbraced Length

    Thank you guys for all the comments. steveh49, that's a good question. In the case illustrated, I was thinking of placing a stiffener between flanges at the bearing locations.....this way, even though only the bottom flange is welded down, the stiffeners unify the entire section at the bearing...
  20. marinaman

    Beam Unbraced Length

    Take a look at the attached simple beam layout. If a person is working thru simple beam design at beam 1 and beam 2, what is the unbraced length that would be used to determine the allowable stress? - BM1 and BM2 are sitting on a concrete wall and welded down (pinned, not rotationally...

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