Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. tadeng

    Firewall breakaway clips

    See attachment for a fire wall system I used a few years ago. It will likely depend on the specific system you are using and how it was tested by the rating agency. Page 4 for this system has the clips at varying spacing depending on wall...
  2. tadeng

    Steel Joist Weight Per Foot

    The Economical Joist Guide weights are Vulcraft's actual joist weights. The Standard Load Table weights are SJI standard weights, which I assume is an average of various joist manufacturers weights for a particular joist.
  3. tadeng

    Wood Diaphragm to Masonry Wall

    Woodman, The way I read 1403.6 that is only a requirement for buildings in flood hazard areas.
  4. tadeng

    Wood Diaphragm to Masonry Wall

    Agree with Mike, so use a strap (Simpson) to attach to blocking where the joists are parallel to the wall. Where they are perpendicular to the wall, strap to the joists.
  5. tadeng

    Interconnected Footings & Soil Expansion

    For residential designs (and small commercial) here in Texas, we use stiffened (waffle) slabs alot. It allows the entire slab to move together. Depending on the soil, there may need to be some soil modification done beneath the structure. Typically either remove and replace with moisture...
  6. tadeng

    Bottom flange cope to clear existing column

    Is there an existing cap plate on the column? If so, can the column be cut off just below the bottom of the new beams, and a new cap plate added? This would allow the beam to bear on the new cap plate.
  7. tadeng

    Void Forms for Expansive Clay

    Surevoid has some testing data that might be helpful here: http://surevoid.com/product/testing.php
  8. tadeng

    Void Forms for Expansive Clay

    Void forms are designed to completely degrade so that eventually you are left with a complete void beneath the grade beam. We use them all of the time here in Texas. We use Surevoid products, as they are wax coated and will break down more quickly than wax impregnated boxes. We also put...
  9. tadeng

    Pipe Hangers to Exist. Timber Joists

    You could have a saddle fabricated out of bent plate and bolt through the joists. Just be sure and bolt to the upper half of the joists to avoid the load pulling downward and splitting the beam.
  10. tadeng

    End Bearing or Skin Friction / Rock

    This has been a topic of debate in our office. Technically skin friction cannot begin working until the end bearing is overcome. Some structural engineers use both skin friction in combination with end bearing when designing drilled shafts. In my opinion if the concrete makes good bond with...
  11. tadeng

    ASCE 7-02 Wind Calcs - Method 2: All Heights Method

    From a code standpoint, I disagree with Ron in that you can have one pressure for the entire roof. There will be different Cp based on length from windward edge. However, it can be cumbersome to have different pressures on the roof. It would be conservative (by 3 times) to use the windward...
  12. tadeng

    ASCE 7 Wind Load?

    I agree with Ron. Treat is as a sign. You will have to take into account that it is 30' off the ground when calculating qz.
  13. tadeng

    ASCE 7-02 Wind Calcs - Method 2: All Heights Method

    Per ASCE, you would have a different Cp depending on the length away from the windward edge (shown in my sketch above). For practicality and ease, you could analyze the entire roof for one pressure.
  14. tadeng

    ASCE 7-02 Wind Calcs - Method 2: All Heights Method

    bmagdalena, You are correct in that leeward is a relative term in this case.
  15. tadeng

    ASCE 7-02 Wind Calcs - Method 2: All Heights Method

    See attachment. I would consider anything past the midpoint as "leeward." The value of Cp you use depends on the distance you are from windward edge with respect to h. So, it will not necessarily be the values I stated...
  16. tadeng

    ASCE 7-02 Wind Calcs - Method 2: All Heights Method

    It is in figure 6-6 in the row for parallel to ridge for all (theta). For the horizontal distance from windward edge, >2h is -0.3, -0.18. So, anything greater distance from the windward edge than twice the height you would use these values. Similar values are given h to 2h, etc.
  17. tadeng

    Concrete slab control joints

    What about using a topping slab? You could cast the suspended slab and then put down a waterproofing membrane to prevent cracks translating through. Then pour a topping slab on top and put sawcuts in the topping slab. You would have more control with the topping slab. If the slab was...
  18. tadeng

    Wood Wall Stud Design

    JAE, Maybe ash060 was referring to IBC 2306.2.1 where in lieu of Cr =1.15 you can use the increases given in the chart, provided you meet the associated criteria.
  19. tadeng

    Wood Wall Stud Design

    Component and cladding minimum pressure is 10 psf acting in either direction (+/-) normal to the surface. In ASCE 7-05 Chapter 6 Commentary they give examples of components ...fasteners, purlins, girts, studs... So, C&C wind loads would be correct loading for stud design.
  20. tadeng

    Underpinning an existing slab on grade during renovation

    Excavate the soil next to the existing building so that you get a maximum of 1:1 slope away from the bottom of the existing footing.

Part and Inventory Search