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  1. EngineeringEric

    Composite Beams with Ordinary Moment Frame

    Working on a project with an 80ft clear span building that is supporting heavy upper floors with concrete deck and limited room for structures and windows all around. Great! So looking at a composite girder lines spaced 15/20/25ft apart with infill beams. The girders that span 80ft will need to...
  2. EngineeringEric

    Anchor Bolts To Granite

    So I have a unique project attaching to a Block of Granite. I do not really need to resist any substantial tension or shear loads as the objects are all self stable in terms of gravity and overturning, however they do need to be anchored. Exposure is exterior but not corrosive or sea. I am...
  3. EngineeringEric

    Disjointed Diaphragm Aspect Ratio

    I have a building with a plan area of 140ft x 58ft. This gives an overall aspect ration of 2.4, not a problem. However, when looking at the section of this building the roof is divided (see attached). There is a clear story in the center. If i look at the aspect ratio for each half I get a...
  4. EngineeringEric

    Standard Engineering Design Procedure

    I work for a small-ish Structural Design and Envelope Consulting firm. We do various structural designs ranging from $10k additions to $7 million complexes. Most of our major projects in question are in the range of 1-2 million. The firm has (2) senior (nearing end of career seniors), (3)...
  5. EngineeringEric

    Old Timber Design Values

    Hello, I feel like I recently came across a post regarding this but i am unable to locate it. I have a building that i am working on which was built in the early 19th century and this isn't uncommon from one my firm's large clients. We often analyze existing structures for current loads...
  6. EngineeringEric

    Teller Glass Cantilever Window system

    I have a project at a certain facility. The facility is being expanded and part of the expansion is the addition of a glass window at the front check-in counter (similar to bullet proof tellers at banks / gas-stations). This window will be attached to an existing counter and extend up 4' and not...
  7. EngineeringEric

    Grout & Concrete Placement Times

    I have a situation where a contractor placed cementious grout after the 90-minute bath to placement time. I, as the EOR, was not aware of this until a list was provided from 4 months prior. The 28-strength sample was taken after placement, and had 5460psi. The final strength is more than I need...
  8. EngineeringEric

    Residential Design. To notify BCO or not?

    A client (friend of a coworker) walked in and wanted us to analyze a proposed deck that the county rejected. The deck is not typical. Carbon Steel W10 beams, Stainless Steel Columns, Cold Formed Steel Joists, concrete-gyp panel decking, heavy finish tile... all on a steel slope and up to 10'...
  9. EngineeringEric

    J Hook with Bolt

    I have a client who wants to install a single pole sign (typical to gas station signs). So with the Anchor Bolts undergoing tension i would design the AB to be 1" headed (hex or square) F1554 with 25" embedt. And the client has some 54" J bolts on hand... So i explained how the extra length...
  10. EngineeringEric

    RISA Templates

    Here at my company we are trying to revise the way we do somethings. We are a small firm but have a wide range of jobs. We typically recreate the wheel each time we use RISA for a project, and we only use RISA really on a few projects a month (office wide). I was wondering if anybody has...
  11. EngineeringEric

    Bar Joist Deflection

    Looking for some inputs. I have a 36'-8" span supporting 4" NW Concrete. I am working with some tight constraints with depth and spacing and wondering what you guys would recommend for deflections tolerances? Mainly what would you recommend for a maximum deflection for similar span, for smaller...
  12. EngineeringEric

    Dumpster Pad Design

    Quick design, no budget to even ask this question here. I have a small dumpster pad, its only design criteria is "support 10kip single wheel load". No soil information. I am coming up with 8" of plain concrete to support the load and then I will reinforce it with the minimum ACI steel at the...
  13. EngineeringEric

    1970 Structural Steel Grade

    Hello All, Wondering what your opinion is on the grade of structural steel in 1970 Construction. We are doing some work on a 280 ft steel truss above a sports arena. We are not doing much in terms of loading so testing is out of the question. I do however have to check some elements for...
  14. EngineeringEric

    Field Fabricated Ordinary Moment Frame (Construction Mistake)

    All, I am looking for some opinions on field made - post installation moment frames. I have project, where the contract drawings and shop drawings all clearly illustrated a moment frame along a line of a small commercial addition. The steel arrived and was installed and then framing went up...
  15. EngineeringEric

    Galvanized and Stainless Steel Bolts Interaction

    I am working on two projects that I am debating the use of Galvanized steel plates and Stainless Steel Bolts.... Both cases will be considered marine and will be in cyclic conditions of wet/dry. 1) Wet, exposed, bridge. I want to use 1/4" plate connections with stainless through bolts to timber...
  16. EngineeringEric

    Floor Vibration on Corridor Bridge

    I am designing a simple-span interior bridge, spanning some 45ft, 8ft wide, second floor corridor loading (80psf LL). I know of ASIC Design Guide No11 - Floor vibrations due to Human Activity; but I have never really looked too in depth through it. I was wondering if anybody had any experience...

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