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  1. hetgen

    Looking for Language Model Trained on Structural Design Codes

    Hi everyone, I’m searching for a language model specifically trained on structural design codes like ACI, AISC, Eurocode, and other engineering standards. Does anyone know of such a tool or have experience with one? Also, I’m curious about how these models handle copyright issues when using...
  2. hetgen

    Shrinkage strain of a Slab on ground supported on a thick EPS core.

    Hi All, Is there a way to estimate drying shrinkage strain grident of a 7-in [180mm] slab-on-ground built on top of triple layers of High desnity extruded Polyethylene (EPS) with each layer ~ 4in [100mm x 3] thick? I think the slab is almost floating, would it be unrealistic to ignore the...
  3. hetgen

    Beam / roof truss Intermediate restraint from steel roof sheeting and purlins

    Hi All, Please see the clips below, is it reasonable to assume that the roof sheeting spaning between points A and B can restrain the purlins thereby providing lateral restraint to the rafter compression flange? If true, are there any guides or empirical rules to check the stiffness and...
  4. hetgen

    Portal milling machine stringent foundation deflection requirement

    We are task to design a foundation for this type of portal milling machine. The deflection requirement specified by the supplier appears very unreal. See the diagram below showing the foundation layout, the length from D to F is 15m [~49 ft], and A to C, which is the width of the portal, is 4m...
  5. hetgen

    Lateral earth pressure on basement retaining wall from a narrow backfill?

    Hi All Please see the sketch below, note the narrow backfill between the rock and the basement retaining wall, what is the best way of estimating the lateral earth pressure at the bottom of the retaining wall? Would it be acceptable to idealize the area hatched in red like a silo and use...
  6. hetgen

    Design of anchor bolts embedded in concrete masonry per ACI-530 / TMS 402

    Hi, Is it okay to use the infill concrete strength instead of f'm ( specified compressive strength of masonry, psi (MPa))in Eqn. 7 when checking the shear capacity of an anchor embedded in concrete masonry as shown in the first picture below? The clips below are from this document. Thanks.
  7. hetgen

    Effects of global geometric imperfections when checking foundation allowable bearing stress.

    Is it too conservative to consider notional loads (horizontal forces added to the structure to account for the effects of global geometric imperfections) when checking foundation allowable bearing stress? The global imperfections are not transient load they are there permanently. But we...
  8. hetgen

    Is there standard for design of Crusher supporting structure?

    Is there standard /design guides for structures supporting crusher specifically steel frame support structure for cone crushers like the one shown below? I mean similar to ISO 5049/ AS4324 /DIN2226, etc, used for continuous bulk handling of material like conveyor structures. Many thanks
  9. hetgen

    How much does a normal cement screed expand with moisture Ingress?

    Hi all, Please see the clip below. The wall is a shotcrete wall with an EPS core and doesn't have much shear strength, so I'm not saying the wall will contain the screed if it expands, but my question is how far does a screed expand per linear length? Does floor screed expand enough with...
  10. hetgen

    Why is roof live load unreducible?

    Consider a large steel roof with a truss girder that supports 600m2 [ 6500ft2 ]; the roof is inaccessible and located in a no-snow area. Why is the roof live-load unreducible in this case? It seems conservative to design the girder with a full live load, according to the eurocode the total...
  11. hetgen

    Dowel Size for Pavement ~ K = modulus of dowel support

    Hi All, Is there an empirical formula to calculate K0- modulus of dowel support for a given dowel and concrete type? or maybe a table for typical dowel used in a rigid pavement? K0 - the reaction per unit area due to applied load when the deflection is equal to unity. I can only find a range...
  12. hetgen

    Continuation deformed reinforcing bars across sawcut contraction joints

    The detail below is for a 9.0m x 9.0m [30 ft x 30 ft] slab-on-grade (slab on ground) panel, my question is won't that amount of steel across the saw-cut joint completely lock the contraction and risk a random crack to form elsewhere?
  13. hetgen

    Question in terminiology

    Why is a relaxation of prestressing strand any different from creep, are they not both strain due to sustained load?
  14. hetgen

    ~34% fly ash cement replace and the strength gain curve show no significant change?

    Hi, We queried a GC to verify the strength curve for a proposed 40MPa (5.8ksi) concrete mix which has a 33.6% fly ash replacement ratio and we received the curve shown below. The curve show no apparent delay in strength gain, is this normal? Considering the high fly-ash replacement ratio we...
  15. hetgen

    Redundancy for transfer beam supporting mid-rise tower column

    Hi good people, How do you account for redundancy/robustness when designing a mega transfer beam supporting a multi-story building column? I'm reviewing a 20-storey concrete frame building with a 50ft span transfer beam on the 2nd-floor level. The building structural geometry is very basic...
  16. hetgen

    Xtreme engineered reinforced Earth Retaining-wall

    Hi Good People, can someone explain how the retaining wall shown on link below works? the only explanation that I got is a voodoo engineering were you put the parts together on sketch and this doll will somehow control the massive retaining wall [bowleft] Link...
  17. hetgen

    Wind only frame with Composite floor

    Hi All, If I consider proper joint rotational stiffness at the column-beam joint, obviously ignoring the concrete section, is it structurally viable to design a wind only 3 story frame with composite floor? Thanks.
  18. hetgen

    Ultimate bond stress and direction of concreting relative to the reinforcing bar

    The Euro code allows 30% increase on the design bond stress depending on direction of concreting relative to the reinforcing bar. (See cut-out below) the increase in the design bond stress allows reduction of development length. Could someone please explain to me how direction of concreting...
  19. hetgen

    Flat slab punching shear link layout

    Hi All, ACI 318 11.12.3.3 reads ....The spacing between adjacent stirrup legs in the first line of shear reinforcement shall not exceed 2d measured in a direction parallel to the column face. However, other building codes such as the Eurocode recommend a further limitation on the spacing of...
  20. hetgen

    Foundation on collapsible soil

    Hey folks, When designing light weight structure on moderately collapsible ground, one recommended solution is to remove in situ material below foundations to a depth and width of 1,5 times the foundation width and replace with material compacted to 93% Mod. But if the collapsible soil horizon...

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