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Recent content by fa2070

  1. fa2070

    Guyed towers, lightning strikes and peopleÆs safety

    Yes, you're right. I was aware of this since the very beginning. The buildings are within falling distance of the tower. I didn't choose the tower erection site nonetheless. In my view, lightnings are much worse than the tower failing due to wind loading. In the latter case, people might have...
  2. fa2070

    Guyed towers, lightning strikes and peopleÆs safety

    Thanks everybody for the comments. They're much appreciated. I'm the project manager and also will be involved with the structural aspects of the tower. I'll outsource the design of the grounding system to a specialized firm. fa2070
  3. fa2070

    Guyed towers, lightning strikes and peopleÆs safety

    I’m in the early stages of planning and coordinating the project of a 160 ft. communications guyed tower (steel tubing) for a 9-mile point-to-point 5.7/5.8 GHz wireless link. The final location of the tower is still being discussed, and therefore subject to change if circumstances demand it. Due...
  4. fa2070

    Concrete culvert widening

    [tab]No, it doesn't need a PE seal.
  5. fa2070

    Concrete culvert widening

    [tab]Does AASHTO cover simple cases like this one? (nothing is simple for me, mind you) [tab]That was the first thing I told the contractor. Nobody cares, though, as long as the solution is fast and cheap. That's what they want. [tab]AFAIK meshes where [Φ] of wire [≥] 1/4" (or 6mm) can...
  6. fa2070

    Concrete culvert widening

    I'll try to describe the situation as best as I can. I have to bridge a 7 ft-wide x 36 ft-long (2m x 11m) strip on the side of an existing culvert for truck traffic (no more than 22 Kips. per wheel). Fig. 1a shows how things look now and Fig. 1b shows how the projected lateral access will be...
  7. fa2070

    RE: Concrete Sway Column - Moments

    asixth, Are you talking of this post? http://www.eng-tips.com/viewthread.cfm?qid=252848
  8. fa2070

    Concrete Tank w/o Joints-ACI 350

    Vibration. Split form. Requires careful workmanship. See attached photo. You can download the slide decks from a waterstop workshop here: http://www.wi.nrcs.usda.gov/technical/eng_Waterstop.asp Pay attention to Waterstop Formwork (PPT; 5234 KB). All the other PPTs and PDFs are also interesting...
  9. fa2070

    Concrete Tank w/o Joints-ACI 350

    So, a construction joint is very similar to a contraction joint. Right? I found this FAQ on PCA's website: Q: Joints: What Type are Used and Where?
  10. fa2070

    Concrete Tank w/o Joints-ACI 350

    While we're at it, can anyone explain the difference between construction and expansion joints? Expansion joints are designed to accommodate growth from temperature deltas whereas construction joints come from scheduled interruptions in concrete pouring (e.g. slabs), but at the end of the day...
  11. fa2070

    Most suitable fill material

    Thanks everyone for the replies. Recommendations taken.
  12. fa2070

    Most suitable fill material

    Hello, I have to build a new reinforced concrete pool inside an old, unmaintained and distressed one. The newer pool will be smaller and shallower, that is, the floor slab will be 6 ft. above the old slab which means that something like 6 ft. of fill will have to be placed and compacted over...
  13. fa2070

    Analysis of concrete trusses

    Thanks everybody for the replies. Highly appreciated.
  14. fa2070

    Analysis of concrete trusses

    Hi, I'm in the early stage of the design of a precast concrete truss... actually a counterfort (see reference [3] for an example). My initial goal was to investigate which arrangement, of all the known truss configurations and their combinations resulted in the fewest tension members for my...
  15. fa2070

    Strut-and-tie modelà once again,

    Are "anchorage" and "development" not mechanically equivalent? If not, what's the difference? I thought both terms could be used interchangeably. Leaving economic/practical/labor considerations aside, for any given diagram of bending moments in pure beam zones I can anchor outside the critical...

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