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  • Users: CarlB
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  1. CarlB

    Anchor Block Sizing Factor?

    The anchor block paper you attached is a design method to prevent joint separation in a segmented pipeline that is attached to a welded/fused HDPE pipeline. As mentioned above, bends within the welded pipeline are effectively restrained by soil friction along the pipeline, and no thrust block is...
  2. CarlB

    NYC Building Code Presumptive Load Bearing Values

    It appears the NYC code goes into quite a bit more detail on soil types, variations in density, etc. than the IBC. And cautions that in addition to meeting the bearing values, designer needs to ensure that settlement will be withing acceptable ranges. So perhaps geotechnical engineers and their...
  3. CarlB

    Unconstrained Bollard Design Check

    I believe you're using the IBC equation properly. I get 8.5' embedment for the 2.5' diameter unconstrained. Maybe 2.0' dia, 9.0' deep would be better. And for constrained case- 1.5' diameter, 6.33' deep.
  4. CarlB

    Passive Pressure Log Spiral DM 7.2 Updates

    Thanks for the link. I had only seen the hardcopy version for purchase. I agree with your calculated value of 6.3 for those phi and delta values. After checking other values in Table 4-2, it appears the table has been mislabeled; the delta/phi values presented are for 0.66 rather than 0.50 (For...
  5. CarlB

    Passive Pressure Log Spiral DM 7.2 Updates

    I don't have access to DM 7.2. But other source https://www.sciencedirect.com/science/article/pii/S1674775517303955) indicates a Kp should for those conditions should be about 6.5. But it notes other studies using log spiral finds variations, some higher. So there doesn't appear to be close...
  6. CarlB

    Ugly Plot Style names

    I understand Bricscad has a Lisp environment, did you try the routine?
  7. CarlB

    Ugly Plot Style names

    Yes I see the copies you created still have the bad plot style; doesn't fix them like it does for me. Upon opening the file I get the message the file was created in other than AutoCAD, maybe that created the problem. Attached is a copy of drawing for which I used the "copy and delete original"...
  8. CarlB

    Ugly Plot Style names

    Something strange is happening with those dimensions. May have cropped in from a program other than AutoCAD? I notice when copying a problem dimension, the copy does not have the issue. So I suggest copying dimensions to the same location, then deleting the original, like below steps. Perhaps...
  9. CarlB

    Ugly Plot Style names

    Could you post a drawing with the offending dimension, I could see if some lisp magic could change the plot style of the text. I have limited rusty skills there.
  10. CarlB

    Frost heave

    Estimating with any accuracy is not likely possible. Perhaps can be somewhat, in a controlled environment like the ASCE study linked above. You didn't mention ground water table level, that's a major factor. And the rate of frost advance is a factor. Even in somewhat consistent soils, the amount...
  11. CarlB

    Equations for Strip Surcharge Loading Inconsistencies

    There have been many Eng-Tips discussions on strip surcharge lateral pressures, you can find in a search. The one EireChch mentions is a good one: https://www.eng-tips.com/threads/lateral-earth-pressure-from-surcharges-and-the-2x-factor.330567 It seems apparent the Das formula is in error, all...
  12. CarlB

    minimum cover for schedule 80 pvc

    Per manufacturer guides, 1 foot cover probably works. https://www.jmeagle.com/sites/default/files/TB06DepthofBurialforPVC.pdf https://www.jmeagle.com/sites/default/files/TB05PVCSewerBurialDepth.pdf
  13. CarlB

    Calculating Sliding Resistance for Equipment Foundation Partially Supported by Soil

    The contact area is not a factor in sliding resistance, the resistance=weight x coefficient of friction. As you recognized, all the weight is transferred to the walls, the void has no 'bearing' on the analysis. There may be a small portion of the slab weight supported on the soil, but as...
  14. CarlB

    Radiant Heated Floor Slab

    Are 2 layers of reinforcing necessary? Aircraft pavement is typically thicker, and unreinforced (or at least used to be). The steel was not necessary for support/structural reasons. Use of appropriate contraction joints addressed crack control.
  15. CarlB

    Question about using hidden linetypes

    You could show it either way, as long as it's well identified which is which. I'd think the road below is more pertinent to the utility installation, so would show the bridge above with less dominant linework, either hidden/dashed, or faded.
  16. CarlB

    Reactions of flat plate pinned on 3 sides

    The load case from "Moments and Reactions for Rectangular Plates" is not quite hinged 3 sides, but may give close results for reactions.
  17. CarlB

    Frost heave in saturated gravel below foundation

    If you think the groundwater can be controlled sufficiently to perform earthwork to that depth, why not instead just place the pier below the frost level and forego the subgrade replacement with gravel? The gravel replacement idea should provide adequate foundation support, as the chance of...
  18. CarlB

    Grading Tolerances

    You mentioned 'tolerances', what are they, what is required by the specifications? For a finished surface of earth (vs pavement), a typical tolerance (allowed deviation from design grade) is something on the order of +/- 0.05 feet, or about 1/2 inch. The tolerance would be independent of slope...
  19. CarlB

    Project Geotechnical Report

    That soil type (silty sand), very low blow counts, below the water table, present very high chance of liquefication during a seismic event, leading to settlement, sand boils, etc. Unless site is in a very low seismic region.
  20. CarlB

    Grenoble method for pile uplift verifications

    The following paper appears to have a worked example using the Grenoble method...

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