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  1. civg

    Structural engineer with question for mechanical engineer: rooftop equipment weights

    Regarding rooftop equipment, in this case a condensing unit, is there a difference between operating weight and net weight? Please see the attached product details for a particular unit. It has a "net weight" of 530 lb. Would this include the weight of the unit with fluid and any required...
  2. civg

    Existing terra cotta structural properties

    I am trying to find a reference that can provide information on the compressive strength of existing terra cotta masonry from 1936. Any feedback would be appreciated.
  3. civg

    Density of early 20th century cinder concrete block?

    Is anyone aware of literature that provides the density of concrete block used in early 20th century "slagblok" construction? I can make a reasonable assumption based on current standards but I would like to try and get as accurate as possible for the purpose of determining existing loads. Thanks.
  4. civg

    Diaphragm Design

    Awesome, thanks. NOW, let's say we have a realistic building that is not a perfect rectangle. I attached a crude sketch that shows some re-entrant corners and jogs. How do I calulate the shear reactions/deck shears and chord forces for a case like this? Is it necessary to have shear...
  5. civg

    Diaphragm Design

    Thank you both for the information. Now in trying to understand the basics for the bond beam and continuous angle design, consider the following simple example: Building is 100'x100', with uniform lateral load of 100 lb/ft. This gives a shear reaction of 5 k and a chord force of 1.25 k. So...
  6. civg

    Diaphragm Design

    As a young engineer, I am having difficulty trying to fully grasp the design concepts required for lateral loads. It seems an entire college course could be devoted to this area of structural design, and the courses I have taken did not cover much of this material. My questions are regarding...
  7. civg

    CMU Wall Embed Plates

    Yes. I am referencing the 2005 Edition.
  8. civg

    CMU Wall Embed Plates

    Thanks guys. Now for Ap, do you know why he is using a two-part equation? Obviously I see the pi(Lb)^2 form the ACI Code, but I still don't know where he is getting the 2(sqrt(2)xLb)xspacing from. For a two-stud embed plate I think Ap would just be 2x(pi(Lb)^2) minus the projected overlapping...
  9. civg

    CMU Wall Embed Plates

    I'm reviewing calculations for perimeter cmu wall embed plates connecting a continuous angle to a roof deck. The embed plates are designed to transfer lateral forces to the walls. Each plate has one row of two headed stud anchors. The equations used are the following: Ap = Pix((Lbolt)^2) +...
  10. civg

    Punching shear on slab on grade

    Got it. Equation (22-10) from ACI Chapter 22 is what I was looking for. Good thing because the punching shear capacity I got from using the equations in Chapter 11 was adequate, and that would have been wrong in this case. Thanks a lot!
  11. civg

    Punching shear on slab on grade

    Consider an existing, 4" thick, unreinforced slab on grade that must support a new concentrated load. I want to check punching shear with the equation Vc = 4*(sqrtf'c)*bo*d (base plate is square). My question is what do I use for d? The ACI code defines d in this case as the effective depth...

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