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SDC B

Here is a similar detail to what has been provided. The top and bottom moment plates are too thin. If there is a way to add additional cover plates to increase the capacity I'd like to at least explore the option. If not, they'll need to replace the plates.

long story short. The fabricator messed up and installed bolted moment connection plates that are too thin. What methods are available to reinforce the plates and welded connections to the column?

Does anyone else have past experience seeking a waiver or exemption from a building official related to rooftop live load requirements for assembly space? I have a client seeking to reinforce an existing roof and hoping to design the roof reinforcement for a lesser load than the new DL +...

Yes, the math and the design are the easy part. Convincing the client that you aren’t over designing the system is the harder part. The “I’ve never seen footings this large” comments are annoying when they don’t have the slightest clue what thrust is or how it’s resisted.

I agree with you jerseyshore, I'm not very comfortable using hairpins only for that much thrust. My design is for pier and footings to take everything, but of course the contractor had a heart attack because top bars may be required in the footing and the footing sizes are large.

Any other suggestions? Design the pier and footing to resist?

There’s about 95 kips of thrust per column. The hairpins would need to be stacked to fit within the slab.

I will need 3 rows and would like to also utilize the hairpins for shear resistance and pryout in the pier.

Has anyone else utilized more than one hairpin to resist large thrust loading? Most examples use one hairpin and this is fine for smaller buildings, but if the thrust is very high can two or three hairpins per column be utilized? Tie rods cannot be used for this scenario.

I appreciate everyone's feedback. I'm just looking for insight and theory with flat strapped walls. I believe they would perform as phamENG described.

I know when designing wood panel shear walls it’s common to utilize the floor framing DL and self weight of wall to counteract overturning, at least a portion of that load is used. Is using the DL common practice for Flat Strap shear walls in metal stud building as well? Most of the software...

I’m looking for resources like books or webinars on arched concrete roof design. I’d like learn more about them for a potential project and research any software programs capable of designing arches. Any help is appreciated.

Thank you!

No AISC

I’m looking for a good resource book with details or some examples of FMC connection design. These would be for connections to column flanges and webs. I know how to design these connections, but I'm being tasked with something specific. The fabricator would like to re-evaluate specified FMC...

I hope someone can help me fully understand the requirements of ACI Appendix D. I'm having difficulty determining if I should be analyzing my cast-in-place bolts for the baseplate using a "cracked" section analysis, which would apply the reductions to meet the requirements of Appendix D. My...

It's a 3.0T MRI and has significant silicon steel lines walls and ceiling panels in addition to the copper RF enclosure. Shielding thickness is dependent upon magnet size and proximity to other MRI machines. 25mm thick in some areas.

I've been tasked with providing design for support of wall and ceiling plating for an MRI project. My question is regarding magnetic pull. I know the dead loads I need to design my structural elements for, but was wondering what, or how much extra load I should be considering to account for...

Slick CRSI has a procedure to calculate approximate deflections by using a solid slab thickness having the computed equivalent stiffness of the waffle slab. The thickness "te" is computed as the average of the gross moment of inertias of the solid head area and ribbed area. Thanks for info on...