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  1. RHTPE

    Durisol ICF foundation walls

    I hope this is the correct forum for this question. I have a client who is getting some resistance from their local building official regarding the use of Durisol's ICF blocks for a below grade foundation. The primary difference with this system is that their 'blocks' are made from rock wool &...
  2. RHTPE

    Cold formed steel joists c.1970 hotel construction

    I am evaluating an existing 3-story hotel for structural modifications. The existing floors consist of a 3.5-4.0" slab on corrugated decking (5/8") supported by what appear to be steels joists. The joists are very similar to metal studs with oval openings in the webs. The profile is a "C"...
  3. RHTPE

    LED vs Incandescent outdoor floodlights on motion sensor fixture

    This may not be the correct forum but I had to start somewhere. I have a Heath-Zenith motion sensor fixture M/N SL-5318-BZ-E (purchased in 2012). In addition to the motion sensor it also has a dual-brightness (DB) feature whereby the lights turn on at half-brightness at dusk. Using a 19.5W LED...
  4. RHTPE

    Springfield Massachusetts Residential Building Code - FIRST edition

    I'm at a loss on this and am hoping someone out there might know if the city of Springfield MA had a residential building code in effect in the mid 1920s. I am evaluating the roof on a single family home that has some issues and I'm curious about any prescriptive code requirements that might...
  5. RHTPE

    Data extraction - Dynamic block rotation quirk

    I have created a number of dynamic "master" blocks inserted into a master layout at various rotations (0, 90, 180). Each of those "master" blocks consists of other dynamic sub-blocks. I am trying to extract the X,Y coordinates of the sub-blocks from each of the "master" blocks, one "master"...
  6. RHTPE

    Paint on threaded fasteners

    Some interesting questions for those who are very familiar with the performance of threaded fasteners: - Given a 1/2-13 bolt & nut: How does a coat of bare metal primer affect the nut-to-bolt connection? Good, bad or otherwise? The threadlocker folks say the paint would adversely affect the...
  7. RHTPE

    Disappearing cursor (crosshairs) in AutoCAD 2015

    Every now & then the cursor in AutoCAD 2015 simply disappears. This occurs in pure model space or when in model space through a viewport. The mouse pointer appears wherever it is outside of AutCAD's drawing space or in another application. Entities will highlight if the cursor happens to be...
  8. RHTPE

    Trump's wall

    [link]http://www.cnn.com/2016/02/17/politics/donald-trump-mexico-wall/index.html?Sr=twtsr0217trumpwall[/url] Typical news person - doesn't know the difference between cinder blocks & CMU or between cement & concrete. I wonder who the "experts" were that CNN talked to. If we were to actually...
  9. RHTPE

    Sliding a landscape foundation wall to the intended location

    One of my contractor clients has decided to attempt to "slide" a incorrectly located retaining wall to its desired location. My task is focused more on the mechanics of the "slide" and the steps involved. I have seen this done with pad footings for interior columns but never for a retaining...
  10. RHTPE

    Concrete Tube Slab - partial demo & construction loads

    Back in the 1960s an engineer in my area (Northeast US) had patented and was promoting a tube slab. It is essentially a one-way joist slab where, instead of using pans, fibreboard tubes were suspended between the top & bottom bars to displace concrete and reduce the dead load. Earlier on in my...
  11. RHTPE

    Concrete slab design for shear - ACI 318-05

    In ACI 318-05 equation 11-5 (11.3.2.1) uses ρw (reinforcement ratio). For typical one-way slabs, shear is highest near the face of the supports. When determining Vc, equation 11-5 can provide a slightly higher value. My question for the group - Is ρw the ratio of top steel to concrete...
  12. RHTPE

    Coordination question RE: CMU wall & CMU shear wall construction

    Not having had a wealth of exposure to CMU construction, I'm looking for some insight regarding efficient construction of CMU walls on top of reinforced concrete foundations. Obviously, proper coordination between the CMU dowels + the CMU core locations + CMU control joint locations + actually...
  13. RHTPE

    AutoCAD 2015 SP2 Std ribbon, Home tab, Block, Insert - Thumbnails no longer appear

    I just noticed this morning that when I attempt to insert a block using the standard ribbon, i.e. from the Home tab, click on Block, then click on Insert, the drop-down shows the block names, but no thumbnails appear. I am running 2015 SP2 under Win 7 Pro x64. The only system change I might...
  14. RHTPE

    Reinforced CMU shear wall (ASD) with dowels into reinforced concrete foundation (ACI 318-02)

    I need the collective wisdom of those who frequent this site regarding the connection between a reinforced CMU shear wall and a cast-in-place reinforced concrete (RC) foundation wall. With a reinforced CMU shear wall, ACI 530-02 limits the steel stress (grade 60) to 24 ksi. In trying to...
  15. RHTPE

    AutoCAD 2015 - Isolating layers from within a Viewport

    Just trying to find out if anyone else has had this issue. Starting from a Layout Tab, I double-click within a Viewport to access Model Space. Then, selecting Isolate Layer(s) from the Ribbon, I select the layers I want to work with and hit <Enter>. All other layers get Frozen. So far, all...
  16. RHTPE

    AutoCAD 2015 hatch issue

    I just switched over (reluctantly) to AutoCAD 2015 after having a hard drive meltdown. Running Win 7 Pro x64. When I attempted to set a hatch pattern, AutoCAD pops up a window stating: "acad.pat" Can't find file. After clicking OK in that popup, I get another that says No standard patterns...
  17. RHTPE

    AutoCAD 2012 - disappearing cross-hairs

    I have been experiencing the inevitable disappearing cross-hairs when working in 3D model space. It happens with various drawing files, always after working for a while in the model, and always with a Visual Style of Conceptual or Realistic. I've observed no particular trigger that causes this...
  18. RHTPE

    Northeast US - Sidewalk repair along state-owned Right of Way (ROW)

    I have been asked to serve on a task force to determine the best course of action for my local municipality. This is perhaps more of a legal question than an engineering one, but I'm hopeful that someone has encountered a similar situation. We have a mill village area that was developed long...
  19. RHTPE

    AutoCAD 2012 Viewport not plotting

    I am temporarily baffled. AutoCAD 2012 under Windows 7x64. I have a drawing file with 21 tabs and a total of 90+ Viewports. Anywhere from 1 to a maximum of 8 Viewports per tab. My understanding is that MAXACTVP applies only to each tab and NOT to the total number of Viewports in the drawing...
  20. RHTPE

    Wind Loading - Almost totally open walled gable roof

    I need to call on the collective wisdom of this group regarding a building undergoing renovation. I have been asked by a contractor to evaluate a partially demolished structure for stability. What is to remain are all of the steel pipe columns, the original roof (essentially flat, 3" thick...

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