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  1. Liam Nesson

    Penetrations through frost heave insulation

    Hi All, I have a number of sites that have a small generator (with day tank) and a small modular non-heated building(4mx4mx4m) both have their own concrete foundation that sits on frost heave insulation. My contractor wants to run a number of 100 diameter electrical conduits through the...
  2. Liam Nesson

    Concrete post foundation through frost insulation

    Hi All, I have approximately 25 heavy industry sites with frost depths varying from 450mm to 3m. For the sites with high frost depth we are using a raft foundation (to support pre-engineered single storey buildings) approximately a meter below grade and then have frost insulation that runs...
  3. Liam Nesson

    Pavers at the corners of a concrete flat roof?

    Hi All, I am currently making some modifications to an existing concrete flat roof (2"stone, geotextile, 4" insulation, dpm, 8" concrete slab), Architect will be appointed at a later date as we are in the early-ish stage. Does anybody know why they would tie pavers together and put them in the...
  4. Liam Nesson

    Floodwall Design - upward water pressure versus buoyancy uplift

    Hi All, I am designed a cantilever floodwall to FEMA259 for the first time, the process seems relatively straight forward given the layout of the standard and worked examples provided. From what I understand, for Dam design the vertical downward and upward forces due to water pressure are...
  5. Liam Nesson

    Time limit for removing steel fireproofing for repairs?

    Hi All, I realise this might not be the correct location to ask this question, but maybe other engineers have run into a similar problem. We are currently preparing to carry out structural steel repairs to the base of a furnace in a petrochemical facility. To complete the repairs we need to...
  6. Liam Nesson

    Cut down and rethread existing anchors

    Hi All, We are planning to remove and replace and existing vessel. We plan to reuse the existing anchor bolts, 1 1/4" dia with approx. 8" projection, only the top section of the rod is threaded. We have a short window between removing the existing vessel and installing the new vessel. I plan...
  7. Liam Nesson

    Dyna6.1 - Pump Foundation Vibration Analysis

    Hi All, Section 3.3 of the dyna6.1 manual states that the dynamic force for a rotating machine is: Po=me.e.ω^2 Then in Section 6.3.1 it states that the input force into dyna6.1 shall be: Forcei = (me.e)i = Pi/ωop where i=x,y,z If the input force = m.e, then the units should be kg.m/s^2...

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