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  1. ReverenceEng

    Standard Hooks for Dowels...

    Greetings fellow weary travelers! ACI 3-18 Table 25.3.1 shows the standard hook geometry for development. The next page has Table 25.3.1 shows the standard hook geometry for stirrups, ties, and hoops. So the question is, what about dowels that are transmitting shear and do not require...
  2. ReverenceEng

    SNOW LOAD DRIFT + SLOPE FACTOR

    Greetings! Question on low roof snow. Background: We apply flat and drift snow loads on a low roof such as a canopy or awning. As the slope of the low roof (such as for an awning) increases, the flat roof snow load becomes a sloped roof snow load which starts to decrease after about 15 degrees...
  3. ReverenceEng

    Risk Category Showdown!

    Greetings! I have a lovely plan checker (licensed civil) in San Francisco who we have dealt with from time to time who is particularly risk-averse and very zealous in his application of special inspections and other requirements. We have a 7'-0" tall architectural sign with a small concrete...
  4. ReverenceEng

    Natural Freq of Tapered Pole with Lumped Mass

    Greetings! Have a ~200 FT pole Sign with a huge cabinet on top. As such, we have a lumped mass at the top, and we have what I would assume to be a non-negligible mass of the pipe along its length, which decreases along the length from top to bottom. Obviously, 'I' decreases, too. There is a...
  5. ReverenceEng

    Case B for Two-Pole

    I have a similar post just before this, but it's fundamentally a different question. Per Chapter 29 of ASCE, we have Case B for freestanding signs that calls for a 0.2B offset, which generally makes sense since it will add some torsion to a pole sign with one pole, for example, or at least...
  6. ReverenceEng

    Using ASCE Commentary to "override" the standard (CH 29 Case B wind on freestanding signs

    General question followed by a specific example: When and how can we use the ASCE 7 Commentary to our advantage when it might conflict with or provide "further clarification" as to the actual standard language? For example, in Chapter 29, when we look at freestanding signs, we need to...
  7. ReverenceEng

    SECTION 1807 - EMBEDDED POSTS AND POLES

    I have been searching for an answer for this for some time, but haven't came across one. Perhaps buried deep in the ENG-TIPS annals... Anyway, Section 1807 provides the two algorithms for embedded posts and poles depending on a constrained on non-constrained condition. The variables list 'b'...
  8. ReverenceEng

    Multi-axial loads on fillet and increased capacity for transverse loads

    I have a situation where I need to sharpen my pencil and try to make use of the increase in capacity for loads in the transverse direction to a fillet weld, but with multi-axial loads. Normally, we would stick to the "traditional" shear capacity of the weld for these more complicated situations...
  9. ReverenceEng

    Clay Tile "Boost" Weight

    Hello all, After scouring the internet for weeks, I figure I'd turn here for what will probably be an easy answer. I'm working with a two-piece mission tile that weighs 10.7 psf, but the designer is calling out a 30% boost. I know what "boost" is, but can't seem to find any resources that...
  10. ReverenceEng

    Stage & Lighting Truss

    Hello, I have a client that has a sub-contractor setting up a stage/lighting truss system that is freestanding. It's nothing complex and not that huge, but my client wanted to inquire as to the requirement for engineering. When they asked the sub for it, the sub apparently replied with...
  11. ReverenceEng

    Rafter Tie Connection Design with Purlins

    Hello, I am looking to learn how to calculate the rafter tie tension (for designing splices/etc.) in a wood frame roof with the inclusion of purlins/strongbacks. I am working with an existing roof that has a wall-wall span of 45'6", so rafter span of 22'9". The roof is 3:12 pitch with 2x6 RR...
  12. ReverenceEng

    Retrofit continuous "L" stem wall to support second story?

    Hello, I have a client that bought a home in the middle of the build and wants to add a second story. The current engineering (not by us) has a typical raised floor, but the perimeter foundations are only 12" wide, 12" deep, and have a 6" (min.) stem wall. They are of the "L" variety. I...
  13. ReverenceEng

    Seismic Calc - Underground Structures

    Easy question (I hope). I have some equipment that is being mounted to the floor, walls, and ceiling of a concrete tunnel (all four sides) that goes under a tarmac. Think: typical walkway that connects terminals underneath the tarmac. I would normally use the SEISMIC DEMANDS ON NONSTRUCTURAL...
  14. ReverenceEng

    Trapeze Seismic Bracing

    I am working on a job at an airport and part of the scope includes these trapeze hanging directory signs. These signs are going to be of the trapeze variety, BUT, in contrast to a standard unistrut trapeze to support mech./elec. that includes beam clamps, threaded rod with stiffener as...
  15. ReverenceEng

    Developing a custom procedure for special inspection

    I have been asked to develop a special inspection procedure some something simple (a wedge anchor) that has been post-installed in concrete. The "what" is besides the point, but I cm curios if there are any formats or templates for something like this, or should I just write out the procedure...
  16. ReverenceEng

    Residential Roof Trusses - 3-pt bearing ?

    Hello all!! I have a simple hip roof home, simple rectangle, but it's about 45 feet across in the truss (short) direction. Although I know trusses can span this far, it's going to give me some large beams where we have some large openings on the side. My loads aren't terrible though - Roof...
  17. ReverenceEng

    Interesting result with anchor design

    Often times we will use Hilti profis or Simpson designer to get values on their respective products. However, I am seeing some funny results that I don't know how to interpret when evaluating a base plate dumping a moment into anchors as with a sign or light post. Basically, as we increase...
  18. ReverenceEng

    Supplementary Tensile Reinf. (Condition "A")

    I have a flagpole with a pretty deep cast-in place pier andrebar cage, using thick plate with about 16 Anchor rods. (130' high pole) My question is, can the long reinforcement that is already in place for flexure be also considered assupplementary tensile reinforcement and allow me to use...
  19. ReverenceEng

    Bolts through Aluminum

    Sample situation: Aluminum angle ledgers attached to wall, wall sign with aluminum angle stringer to hang off ledger. What type of bolts are best to fasten along the length (exclude aluminum bolts)? Steel manual and other sources show that a mechanically deposited or hot dipped bolt would be...
  20. ReverenceEng

    Stainless Steel Fasteners and Auminum

    Sample situation: Aluminum angle ledgers attached to wall, wall sign with aluminum angle stringer to hang off ledger. What type of bolts are best to fasten along the length (exclude aluminum bolts)? Steel manual and other sources show that a mechanically deposited or hot dipped bolt would be...

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