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If you notice on the Aslani + Goel equation, the force on the intermediate connecter is independent of the applied load. Therefore, I think it can be assumed that there is no load on the weld until the buckling load is reached? Not sure.

RFruend – Excellent reference with your prior post. I would recommend everyone check out the following link. I’d also recommend downloading the article, if you have access to it. http://www.modernsteel.com/steelinterchange_details.php?id=929

PAStructuralPE – For your first part of your response, I would recommend checking out Jack McCormac, “Structural Steel Design” book on GoogleBooks. Start around page 174. It’s a great resource for this topic. I think your statement “I don't believe that buckling of a column is associated with...

Ishvaag – I’m not following you. I’ve attached a sketch of a simple column with some numerical values. Can you solve for “e”? I’m assuming the column is perfectly plumb and straight, and the load is applied at the center of the section. I still don’t know how a moment can be computed from a...

Thanks to all who posted. The responses are of great help. Here is my response. I don’t believe it is possible to determine numerical values for the curvature of a buckling column. I can determine the theoretical buckling shapes for a buckling column (i.e. “k” values), but an actual maximum...

I'm trying to determine how to calculate the required weld size for a built-up column. This is not a typical built-up column (i.e. lattice, etc.). This built-up column consists of three plates to form an "I" section. There are welds between the web and the flanges. Obviously, the welds sizes...

I'm working on a small project where we are replacing a portion of the concrete sidewalk on top of a below grade parking garage. Basically the below grade parking garage extends beyond the face of the building. The concrete sidewalk is bearing on the structural concrete deck. I have two...

@ FinnB - I was agreeing with you. Heavy loaded walls will create high stresses in the thru bolts, which makes the "pinch beam" impractical for some cases. We are looking at using the "needle beam" method, however this will be a slighlty more difficult method for the contractor.

@JAE – Do you continue the installation of the steel plates at bearing as well? My biggest concern regarding the “pinch beam” method is the load/shear transfer at bearing. I’m assuming that the weight of the supported wall is being transferred by the thru bolts that are located beyond the...

I recently worked on a project where I was asked to develop reinforcing to create an opening in a brick masonry load bearing wall. The opening was approximately 9’ and the cross section of the wall was triple wythe brick masonry. We were looking at using the “pinch beam” method (as found in...

Thanks ekhaw and strucuturesguy for the insight. ekhaw, I believe you have answered my question!!! Sometimes it might help to read the entire chapter. Thru bolts are not governed by ACI 318 Appendix D. I have no knowledge of provisions for the design of thru bolt anchors other than punching...

Ishvaag & KBVT - Great points! I will include punching shear in my analysis. StructuralEIT - Thanks for the response! Do you know of any references that state the "k" values are proportionate to micro-cracking? From my understanding the "k" values are determined from testing.

Ron - The plate does not fit throught the hole. The plate is attached at the underside of the concrete deck. The diameter of the core drilled hole is approx. 1/16" greater than the diameter of the bolt. I'm not talking about adhesive anchors, however adhesive anchors can fail with a pullout...

I'm analyzing a steel bolt thru anchor that was installed thru a hardened reinforced concrete slab. The slab was core drilled, and then the anchor was pushed thru the hole. On the backside is a 3"x3"x1/2" back plate. The anchor is loaded in pure tension. I'm trying to determine the concrete...

I've been asked to develop a repair procedue for 10 4-story residential apartment buildings. Standard brick buildings with wood trusses that are approximately 40' long. The buildings are currently having ventilation problems. During my investigation, I found that there is no opening at the...

Thanks everyone for the replies!!! Answers: 100% Waterproof. Standard concrete. I'm leaning towards using the bentonite. I'm concerned about the ability to install the product on the uneven chipped concrete surface. Any experience with this? Does anybody know the useful life of bentonite...

Does anyone have insight on how one can obtain a watertight full depth concrete replacement for a concrete liquid retaining structure? Is simply installing patch material against existing concrete adequate? Thanks!!!

I am using a base plate and Hilti adhesive anchors.

Metengr: Do you know what specific sections of the building code or AWS code that state the acceptability of weld defects?? Ndeguy: I will check those books out at my University’s library Maybe I stated my question incorrectly. I’m looking for documentation on strength reductions due to...

I’m surprised I have not found this topic elsewhere on eng-tips. I'm trying to find out if there are any books that explain structural consequences from weld deficiencies. I will be looking at visual inspection and ultrasonic inspections soon, and I need to know what to reject and/or accept...