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  1. astructurale

    Approximate Design Dead Load of Stairs

    I need to know a good estimate on the weight (psf) of Steel Bar Grate Stair Treads & Stair Stringers. I have a stair imposing loading on a slab. I need to check the slab for the laods, but I don't know what the dead loads are for stairs of this type. I just need a safe ballpark assumption.
  2. astructurale

    Strut & Tie - Calculating Node face dimensions

    Deep Beam Design - One span w/ Cantilever one side only: When designing a deep beam by strut and tie I'm getting bogged down in determining the appropriate dimensions to apply to the faces of the struts. In the ACI 318-02 Code Reference example ACI calculates these faces based on the lowest...
  3. astructurale

    ACI Appendix D Anchor Design - SOFTWARE?

    Does anyone know if there software out there for this yet?
  4. astructurale

    Torsion Constant (J) for Concrete Inverted Tee Section

    Anyone know the hand calculation for the torsion constant (J or sometimes shown as Jt) of an inverted tee section of concrete? My college mechanics of material book only gives examples for thin wall tubes and pipes. I'd rather know how to do it by hand instead of letting a computer tell me the...
  5. astructurale

    Beam Rotation (Precast)

    I am designing a beam that will pick up (2) other beams. The supporting beam is pocketed for the (2) beams, so there is torsion induced in the beam. I have designed the section for the shear and torsion, and it is adequate. My question is how to I make sure that the beam will not rotate such...
  6. astructurale

    Tooled Joints in Topping over Hollowcore Joints

    When using hollowcore in a parking deck are tooled joints required in the topping at every plank joint? The PCI recommendations for parking structures indicates that they are recommended, but is it necessary at every joint? Would every 12ft or another spacing corresponding with 4ft plank work...
  7. astructurale

    High Strength Coil Rod

    I'm using High Strength Coil Rod for a column to beam connection. When anchoring the rod into the column I have an edge distance of 3 1/2" (round column, square rod pattern, 4 rods each 6" off CL and 90deg apart). Since the rods are threaded they achieve better bond than a smooth bar. Can I...
  8. astructurale

    Which nut to use w/ASTM 1193 Gr. B7 NC Threaded Rod?

    Which nut should I specify to use w/ASTM 1193 Gr. B7 NC Threaded Rod?
  9. astructurale

    Precast Concrete Beam Design for Flexural Capacity

    Using computer software to generate precast and prestressed concrete beam designs is a usefull tool, but it seems that for some particular cases the design becomes too conservative. I've run across the following when designing simple span uniformly loaded beams, ØMn < 1.2Mcr and ØMn < 2.0Mu...
  10. astructurale

    Design of an Angle as a Beam

    How do I go about designing an angle as a beam (a short one of course)? My angle is loaded on the inside face of one of the legs (not an upside down L where stiffeners could be added) so it is not stiffened, and it is not braced the full length. I've looked through the LRFD (2nd Ed) and it has...
  11. astructurale

    Deflections

    I am designing a precast beam that meets ACI 318 deflection criteria, and the beam meets it fine, but I seem to have a mental block in allowing a beam to have 3/4"-1" of deflection (20ft span) under full loading. It should be noted that my live load is very small in comparision to my dead load...
  12. astructurale

    How many hours per week do you work?

    Along the lines of commute time (thread731-125181)... (Which I should add is fun to read!) How many hours are engineers working per week? And... How flexible is your schedule? (Are you an "8-to-5"er or were you able to choose your hours? I'll go first, 40hrs per week (99% of the time) 8am -...
  13. astructurale

    Precast Slab Design - Transverse Steel for HS20-44 Loading

    I am designing a 12" deep precast slabs that span over a creek at a residence to resist HS20-44. (2-10ft wide, 20ft span, 2" composite topping) I have designed it for flexural capacity and shear, and it meets the deflection and crack criteria. How do I specify the transverse steel? Is there a...
  14. astructurale

    Precast Slab Design - Transverse Reinforcement (HS20-44)

    I am designing a 12" deep precast slabs that span over a creek at a residence to resist HS20-44. (2-10ft wide, 20ft span, 2" composite topping) I have designed it for flexural capacity and shear, and it meets the deflection and crack criteria. How do I specify the transverse steel? Is there a...
  15. astructurale

    Precast Slab - Transverse Reinforcement Question

    I am designing a 12" deep precast slabs that span over a creek at a residence to resist HS20-44. (2-10ft wide, 20ft span, 2" composite topping) I have designed it for flexural capacity and shear, and it meets the deflection and crack criteria. How do I specify the transverse steel? Is there a...
  16. astructurale

    Precast Slab - Transverse Reinforcement

    I am designing a 12" deep precast slabs that span over a creek at a residence to resist HS20-44. (2-10ft wide, 20ft span, 2" composite topping) I have designed it for flexural capacity and shear, and it meets the deflection and crack criteria. How do I specify the transverse steel? Is there a...
  17. astructurale

    Development Length of High Strength Coil Rods in Concrete

    Does anyone know how to specify the length of a coil rod embedded in concrete to develop the full strength of the rod? There are charts for re-bar, of course, but is there a similar calculation for coil rods?

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