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  1. la belle vie

    Did Hilti Make a Mistake? Or Do I Not Understand Shear Friction

    With shear friction, no dowel action should be considered. The shear resistance is equal to the clamping force times a coefficient of friction, which depends on whether the shear surface was cast monolithically, separate but intentionally roughened, etc. At ultimate, the clamping force is the...
  2. la belle vie

    Did Hilti Make a Mistake? Or Do I Not Understand Shear Friction

    I agree with Hilti. Shear friction means that shear across a joint causes the concrete surfaces to move relative to each other, and surface roughness forces the surfaces apart putting the bars in tension. You generally don’t count the bars that are already in tension from flexure.
  3. la belle vie

    Vibration from nearby construction

    Take some photos ASAP so you can prove that any new damage was caused by the construction.
  4. la belle vie

    Design and construction of 126m tall flagpole Design parameters

    Any airports nearby? Could you use a guyed structure?
  5. la belle vie

    Dam Failures in Derna, Libya

    Another tragedy is the lack of failure modes analysis, surveillance and monitoring, and emergency planning. There are plenty of dams around the world that have vulnerabilities. But the potential failure modes need to be recognized, continuously monitored, and planned for. Every dam whose failure...
  6. la belle vie

    Concrete Protective Posts

    One issue is that that everything is painted black so people don’t notice the light posts or bollards when they back up. Protective bollards are meant to be sacrificial. They will deform when hit, but are positioned far enough away so as not to damage the equipment they are protecting. But to...
  7. la belle vie

    Overturning checks, buoyant force load factors

    Why not do the calculations with unfactored loads and determine a single factor of safety. That’s how we do it in the dam world with requirements for safety factors based on the extremeness of the loading. Also, for example, Con-Edison specifies a single 1.2 safety factor for their manholes for...
  8. la belle vie

    Guardrail base connections

    Could the detail be dependent on a minimum number of posts with fully welded rails between.
  9. la belle vie

    Corroded Steel Column With Hole Repair Method

    You will need to remove the concrete curb. Repair plates should bear on the base plate. You may need ships to get around the existing welds.
  10. la belle vie

    Required shrinkage reo in concrete water retaining structures

    Looks to me like the tank tried to shrink while the dowels stayed put. Were the vertical bars on the outside?
  11. la belle vie

    Slab on grade with drilled pier system

    Generally Yes. You need to design the slab to span between the grade beams, and the grade beams to span between the drilled shafts. You can pour the concrete against the soil, but over time the soil will settle relative to the shaft supported grade beams.
  12. la belle vie

    Weld Capacity Analysis Using FEA Results

    Probably not. In real life the weld will yield at the stress concentrations and redistribute.
  13. la belle vie

    Parking Garage Concrete Column Failure - Ontario Canada

    Not sure if this could be an issue, but the in situ bedrock in this area is highly compressed. It heaves elastically when excavated then creeps significantly once the structure is built. There’s also expansive shale in the area.
  14. la belle vie

    NYC Parking Garage Collapse

    I wonder if the building was originally designed as a garage that was expected to have every floor loaded to the max. Did they use live load reduction factors back in the 1920s?
  15. la belle vie

    Job Hop

    When you get old like me you get used to being surpassed career-wise by others. Someone I worked with back in the 80s when we were junior engineers is now CEO of a multi-national engineering company. Why not me? It’s just not my skill set or my desire! People at your level should be able to run...
  16. la belle vie

    Pedestrian barriers connected to long spans of I beam or PFC

    May be ok as long as there is a suitable cross member framed in at the post location. Totally wrong if not. An inexperienced engineer can overlook this. I have seen this kind of mistake with microwave antenna attachments to buildings. You can’t just bolt to a flange. There needs to be some kind...
  17. la belle vie

    Parking Deck PT Slab - Slope for Drainage

    Can you make the PT slab thickness uniform and add topping with some minimum thickness that is sloped to drain? This is what I’ve usually seen. The topping could be lightweight.
  18. la belle vie

    Hydrostatic pressure between shoring and basement wall

    Even 1/100 inch of water would generate the same pressure as a lake. Is there anyway you can drain the area? The Schoellkopf power plant disaster is a good example. They grouted up a bunch of pesky leaks on a rock face not appreciating there was a vertical joint in the rock parallel to and a few...
  19. la belle vie

    Round Pad Footing

    Ah yes WinelandV. My brain just exploded!
  20. la belle vie

    Round Pad Footing

    For a circular footing, wouldn’t you just calculate P/A +/- M/S? For M, you could calculate a single resultant. S=Pi*d^3/32. Not easy to construct, but easy to analyze, no?

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