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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...

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