Eng-Tips is the largest forum for Engineering Professionals on the Internet.

Members share and learn making Eng-Tips Forums the best source of engineering information on the Internet!

Register Log in
  • Congratulations JStephen on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. Philip.screw

    Seismic Design Requirements for a Concrete Pier Supporting a steel braced frame or moment frame.

    I apologize for the late reply. Let's say I have a 2-story steel ordinary concentric braced frame with a pinned column bases, or a steel special moment frame with fixed column bases. In both cases I am relying on the pier to transfer my seismic forces into the foundation (spread footings).
  2. Philip.screw

    Seismic Design Requirements for a Concrete Pier Supporting a steel braced frame or moment frame.

    My firm is working on several projects where we have steel braced frame or moment frame on top of concrete piers. In one of our projects, we have a steel braced frame (OCBF) on a 6ft tall pier connecting it to the footings. I am in a high seismic region as well. I am reviewing ACI318-19 to see...
  3. Philip.screw

    Designing Foundations with Grade / Tie Beams to Resist Overturning

    So the grade beams provide overturning resistance and prevent the individual footings from overturning, correct? However, there would still be rotation in the footings, and that rotation would depend on my grade beam stiffness. From my FEM matt slab in Risa, I can see that the soil bearing...
  4. Philip.screw

    Designing Foundations with Grade / Tie Beams to Resist Overturning

    It sounds like my manager is talking about a grade beam like you say above. I guess my confusion or lack of understanding is how the grade beam stops all overturning in a footing. Ignoring small rotations and deflections, I do not understand how a grade beam with fixed end conditions between two...
  5. Philip.screw

    Designing Foundations with Grade / Tie Beams to Resist Overturning

    Unfortunately pinned bases will not work due to high seismic loads and my risk category making my drift limit 2%. I already have some big column sizes so bigger steel is not an option either.
  6. Philip.screw

    Designing Foundations with Grade / Tie Beams to Resist Overturning

    I've attached a sketch of my frame. I have 3 frames like this in each direction. I'm using fixed bases due to a 2% drift limit. The way it was explained to me was the grade beams will act like the beam in the attach screenshot. However, I don't understand how that is removing all overturning...
  7. Philip.screw

    Designing Foundations with Grade / Tie Beams to Resist Overturning

    Hello all, I have had a number of design projects recently where I have had to design foundation to resist significant overturning forces from moment frames. While trying to design the footings for the lateral resisting members, I was running into an issue where my software (RisaFoundation and...
  8. Philip.screw

    Using ASTM C94 Ready Mix Concrete instead of ASTM C476 Grout for Masonry

    I'm reviewing a masonry grout mix submittal, and noticed the submittal called the CMU fill out as ASTM C94 ready-mixed concrete. Our specs explicitly state ready-mixed grout shall be ASTM C476 grout for masonry. I want to reject the submittal because it clearly does not meet the ASTM we provide...
  9. Philip.screw

    Designing Jamb Bars for an Opening in a CMU Wall

    When designing an opening in a CMU wall, do you need to design rebar members to resist out-of-plane forces similarly to a jamb stud with wood construction? The attached image is a generic CMU wall detail I found on Google. The detail calls for bars at the opening jambs, which I assume helps...
  10. Philip.screw

    Masonry Cement vs. Mortar Cement

    A discussion came up about whether we should be prohibiting masonry cement in our specs. Specifically, we prohibit masonry cement (ASTM C-91/91M) but allow using mortar cement (ASTM C-1329/1329M). Are the differences between the two significant enough to prohibit masonry cement? Is there a case...

Part and Inventory Search

Back
Top