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  1. dcStrucEng

    Soldier Pile Analysis/Design

    Has anyone used RISA 3D for analyzing and designing soldier piles? I use RISA 3D a lot, but I haven't tried it for soldier piles. I realize that I would need to use springs to simulate the soil into which the pile is embedded. I'm just wondering whether it's more trouble than it's worth and I...
  2. dcStrucEng

    Truss Connections with Double Angles

    Thanks for the feedback thus far. The project is in the US and is in accordance with AISC standards. For this particular truss, the double angle web to gusset connections will be bolted not welded. Although the gussets will likely be shop welded to the chords (WF members). Fortunately...
  3. dcStrucEng

    Truss Connections with Double Angles

    I am detailing steel truss connections and I am having a brain fart about something; hopefully you all can set me straight. I have the truss designed and now I am drafting it, specifically the connections. I started with a truss line diagram (based on my analysis model) then overlaid the...
  4. dcStrucEng

    Misleading Article?

    JStepehen - True, but a majority of us reading Eng-Tips forum posts are technical minded and could infer that maybe there are no design issues. But this is an article for the general public in a newspaper. Not everyone reading the article may realize as such and could easily jump to the...
  5. dcStrucEng

    Misleading Article?

    http://www.chicagotribune.com/suburbs/naperville-sun/ct-nvs-naperville-carillon-repair-meeting-st-0818-20170817-story.html By the headline of this news story you'd think the building has structural deficiencies caused by poor structural design. I've read the article three times now and the...
  6. dcStrucEng

    The role of Cracked Stiffness in Analysis and Design

    It's very possible that I'm misinterpreting something (please let me know if I am) but, Celt83: If you are performing a strength design of a concrete structure using a program, you'd create load cases using the ultimate wind and seismic loads and modify the various structural members using the...
  7. dcStrucEng

    The role of Cracked Stiffness in Analysis and Design

    I think we should make a further distinction between a service level analysis and a strength level analysis. In the Commentary of Section 10.10.4.1 of ACI 318-11, it states the following: So a service level analysis which is used to determine deflections, drift, periods, etc. can utilize 1.43...
  8. dcStrucEng

    Concentrated Load on Existing Composite Slab

    I hear you about cyclical loads. For the purposes of this thread, let's take dynamic/cyclic/moving loads off the table and focus just on a static, concentrated load bearing on top of the composite slab. For those not familiar with the deck catalog's example nor the requirements in SDI, once...
  9. dcStrucEng

    Concentrated Load on Existing Composite Slab

    Hokie, I agree that composite deck slabs are only considered in one direction. But following the concentrated load example in the deck catalog and the requirements of SDI (2017 version currently on their site), one of the design checks is for the weak axis moment of the slab (perpendicular to...
  10. dcStrucEng

    Concentrated Load on Existing Composite Slab

    I have come across many threads on this site regarding concentrated loads on composite slabs. But I have a slightly different twist on things on which I am hoping to get opinions. I have reviewed the concentrated load example in various deck catalogs as well as reviewed the information in SDI’s...
  11. dcStrucEng

    Axial load in gravity beams

    Thanks Josh. Delving into the model further, the axial loads are occurring at locations where the beams are supporting CMU infill walls. It appears that RISA is connecting the walls and supporting beam and analyzing them as a composite deep beam. So the supporting beam is acting as the bottom...
  12. dcStrucEng

    Axial load in gravity beams

    I'm modeling a floor area in RISA-3D. The floor assembly consists of steel beams supporting a noncomposite concrete on metal deck slab (4" concrete on 3" deck, 7" total). I'm just modeling the beams and inputting the slab as uniform load on the beams. I'm setting the Lb-yy of the beams to...
  13. dcStrucEng

    RISA 3D v14 Lateral Load Distribution

    Thanks for your reply. I would really like to use the auto generated wind loading in RISA-3D to avoid creating the numerous cases and combos. So I will model my diaphragm with plates and modify its properties appropriately. But please confirm that this procedure will work, because looking at...
  14. dcStrucEng

    RISA 3D v14 Lateral Load Distribution

    I am using RISA 3D v14 and I do not have RISA Floor. I am modeling a somewhat complicated two-story structure (high-end residence) composed of steel posts, steel beams, CFS floor joists, and CFS shear walls. I can design the CFS floor joists and CFS shear walls easily enough using catalogs...
  15. dcStrucEng

    New MEP hangers in existing buildings

    I'd like to solicit some opinions/advice for how other have dealt with the following situation. When working on projects that involve the renovation of existing concrete buildings, how have you all handled the specification and installation of new hangers to support MEP equipment? On projects...
  16. dcStrucEng

    Low Shrinkage Concrete Joint Spacing

    I am working on a project in which a large portion of the first floor area will have a floor finish consisting of an exposed polished concrete slab on grade (6" thick). The goal is to maximize the control joint spacing as much as possible while still providing for the typical isolation joints...
  17. dcStrucEng

    Wood Design Resources

    As a follow up to this post, I own "Design of Wood Structures" by Donald Breyer, which I think is a great reference book for general wood design. I recently received a flyer in the mail advertising a discounted copy of the 6th edition of the Timber Construction Manual by AITC. I'm curious...
  18. dcStrucEng

    Re-anchoring Cornice to Steel Beam

    My situation is as follows: While working on a project involving interior renovation work on an existing commerical property (circa 1900s), the connection of the cornice at the front facade to the steel wide flange lintel appears to have issues. The lintel is approximately 20 to 25 feet long...
  19. dcStrucEng

    Guardrail Post Pocket

    You may want to look into a product like Rockite or Kwixset, http://www.wagnercompanies.com/rockite.aspx Good luck.
  20. dcStrucEng

    Concrete Moment Frame Question

    If I have a multi-story concrete building with shearwalls as the primary LFRS, this will be considered a non-sway (i.e., braced structure). Therefore, I assume all of the columns in the structure (which don't contribute to the LFRS) would be designed with a k-factor of 1. Now, if I have a...

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