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Do you mean an embedded plate at the bottom of the anchor group? I understand that would help pullout, but how does that help the concrete breakout in tension condition (governing)?

Hi all, My problem and question stated below: I have applied loads of 500kip uplift and 100 kip horizontal onto a 3' x 3' x 3.5' tall pedestal hooked into a 5.5 foot mat foundation. I have 12 - 1.5" diameter bolts arranged in a 4x4 bolt pattern with 8 inch spacing between bolts. The...

Aha, thank you @hokie66.

Thanks very much for the details @SlideRuleEra. Seems like a simple solution!

Thanks @hokie66 Are you suggesting the other end be free to allow for twist and lifting? Guided slide bearings only allow for movement in one direction, correct?

I am working on a high elevation platform/walkway connecting two vessels. I am looking for examples, input, or advise on the best connections for the job. For different elevation platforms I've seen stairs hinged at the top, then free at the bottom to allow for twist, sway, etc. however, the...

ACI318-14: headed stud - a steel anchor conforming to the requirements of AWS D1.1 and affixed to a plate or similar steel attachment by the stud arc welding process before casting, also referred to as a welded headed stud.

Once20036 thanks for the link. So I guess really the answer is it's not prohibited by the code, but not recommended by some. CARunderscore, I agree.

Thanks @TehMightyEngineer, I appreciate your answer. This is what sparked my research: http://www.portlandbolt.com/technical/faqs/headed-anchor-bolts-vs-rod-nut/

Definitions from ACI 318-14: Anchor – Steel element either cast into concrete or post-installed into hardened concrete used to transmit loads Cast in Anchor - is only a headed bolt, headed stud, or hooked bolt. Post-Installed Anchor – expansion anchors, undercut anchors, adhesive anchors...

Interesting approach, I will take a look at those codes. Thanks for the reference!

Thanks for the help folks [thumbsup2]

Does load factoring take this as an extreme event like seismic?

Thanks @TehMightyEngineer. "When lightning strikes a lightning rod, a large lightning current flows into the ground through the lightning rod conduction wires and the steel framework of the building."...wonder what would happen to the steel structure if there was no lightning rod?

Thank you @Lomarandil,that sounds pretty close. I found an equation for the short circuit force in substation bus structures and will apply it to approximate.

Thanks @TehMightyEngineer

Does a lightning strike apply any additional forces to a structure? I have done some research on this and have come across: "Any conductor carrying lightning current will be subject to an electromagnetic force F=Bli in Newtons." B = the component of the magnetic field at right angles to the...