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  • Users: efsinc
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  1. efsinc

    glulam beam analysis software

    hi, Does anyone have a recommended software to analyze a grid line full of glued laminated girders with cantilevers, double cantilevers and drop in beams? It'd be nice if it would calculate the volume effect factors. automatic Roof live load reductions based upon tributary areas would be nice too.
  2. efsinc

    MacDonalds Playplace

    I have been asked to investigate this structure by an HVAC installation contractor presumably for a roof mounted HVAC replacement. The told me is is called a "Fullerton style pre engineered steel playplace", and, obviously, for MacDonalds. My searches have yielded no information or history on...
  3. efsinc

    topographic effects on wind on roof mounted equipment ASCE 7-05/10

    This question has to do mainly with ASCE 7-10 but also indirectly with ASCE 7-05. I read an engineer's report in which he said that ASCE 7-05 did not require consideration of topographical effects on the wind pressure when evaluating wind pressures on roof mounted equipment. 1st question. Is...
  4. efsinc

    ASCE 7-10 wind loads on roof mounted equipment

    Would you consider the lateral force Fh (29.5-2) and the uplift force Fv (29.5-3) simultaneous on roof mounted equipment?
  5. efsinc

    HVAC RTU weight R22 vs R410a

    Hello, I'm visiting as a structural engineer looking for some guidance. I've been told that R410a HVAC RTU equipment will weigh more than R22 HVAC RTU equipment of the same capacity. This is important as I advise my client of structural engineering issues for his retail buildings as he...
  6. efsinc

    Post tensioned wood beam

    My client has a roof structure over a busy retail store with existing 6x16s at 8' o.c. Spanning 30' in southern California which does not know how to spell snow. He wants to add HVAC loads to the roof. The underside of the roof is very congested with ducts and conduits etcetera such that a...
  7. efsinc

    torque to tension

    i need to develop a certain tension in a steel rod with a turnbuckle. has is the correlation between a torque wrench and the rod tension made? sure appreciate your help.
  8. efsinc

    60' wood bowstring truss broken bottom chord

    My client has 60' span bowstring trusses in need of various repairs. I have seen engineers utilize a rod and turnbuckle system to provide tension at the bottom chord line. The system seems sound to me. How do I instruct the installer to achieve the required tension in the rod system? How do...
  9. efsinc

    Roof Top Mounted HVAC Equipment - Overturning Requirements

    Are there special overturning moment resistance requirements in the code for Roof Top Mounted Equipment? Where are the requirements specified? Thank you.
  10. efsinc

    Bracing Design for Steel Joists Skewed 5% from Vertical Plane

    The architect is sloping the roof 5%, 7' in 140'. the 30K series steel joists @48" o.c. will span the 50' bay from a 5% downward sloping wide flange beam to a 5% downward sloping steel ledger on a cmu wall. thus the direction of the slope is perpendicular to the span of the joists. the...
  11. efsinc

    Building Movement: cause and fix

    The client says his 2 story, wood framed, raised foundation, Northridge CA area apartment building is moving. Upon first site visit, indeed there is an apparent 'bulge' at the first floor sill level, about 3 feet above grade. No measurements were taken yet, and i could not be sure visually...
  12. efsinc

    1940s post tensioned slab...stressing out?

    The existing slab exhibits significant sag, the client's rep tells me. I am thinking the solution may be to bypass any slab strength at all, to jack the slab up to level and to install a completely new structure in steel to support the slab from underneath. At the end, the existing slab...
  13. efsinc

    raise roof on existing tilt up in southern california

    the owner would like the bottom of the new roof structure to be at 25' for most of the structure. the top of existing tilt up wall is 25'-0". if i use 30" deep truss with bottom chord bearing on top of wall secured for seismic wall anchorage, can i transfer horizontal diaphragm shear at top of...
  14. efsinc

    what is correct procedure to 'sister' a new rafter to existing rafter

    i am strengthening a portion of a roof to support additional (50% to 75% more)dead load. The existing "simpson" hanger capacity is ok for the new load. i have seen others attach a new rafter against the existing rafter. The member sizing is trivial. How does the connection between the new...

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