Structural analysis | Bond properties between corrosion resistant reinforcing steel and concrete.
This research program aimed to identify differences in the bond characteristics of corrosion resistant steel bars embedded in concrete relative to standard ASTM A615 reinforcing steel.
An experimental program was conducted where reinforcing steel bars were embedded in blocks of concrete and then pulled out while recording tensile load and bar slip
Beam End Test Specimen Dimensions and Details:
The typical beam end test specimen is a 24 in. by 11.25 in. by 9 in. concrete block with a reinforcing steel bar embedded as shown in Figure 11. Grouped forms were constructed out of 0.75 in. thick plywood and 2 in. x 12 in. boards, such that 1 form could hold 9 individual specimens.
The reinforcing steel was embedded in the concrete with a bonded length, Le=4 in. The short bonded length, achieved by embedding the majority of the bar in 1 in. diameter polyvinyl chloride (PVC) pipe, was employed to encourage a pullout failure of the bar from the concrete before bar yielding.
that preliminary tests documented in Johnson (2010) demonstrated that for Le 5 in. the steel yielded before bar pullout for the #4 bars. The experiments described in the following sections demonstrate that even with Le=4 in. that many of the #4 bars failed by yielding, an unexpected result.
Beam End Test Frame Details:
The beam end tests were performed with the structural loading frame
The frame provided a self-equilibrating reaction for a 50 kip MTS tension/compression servo controlled hydraulic actuator that pulled on the test bar embedded in the beam end specimen
The moment frame was flanked by two W21x55 beams anchored to the structure’s lab reaction floor.
A steel C8x13.75 beam spanned between the W21x55 beams and served as the lateral compression reaction at the top of the beam end specimen
A steel 4x4x¼ square HSS section served as the bottom lateral compression reaction. A built-up steel angle spanned between the W21x55 floor beams to provide the compression reaction across the top of each specimen
The compression brace was anchored to the floor beams with two 1 in. diameter A325 bolts tightened to a torque of 80 lb·ft. with an impact wrench
Relative Rib Area and Load-Slip Response:
Although the primary focus of this study was to explore the load-slip behavior between CRR bar types, the testing results have made it clear that relative rib area is the most influential parameter affecting load-slip response
Another important observation from this study was that stainless steel had on average a lower bond stiffness than A615 steel when comparing bars with similar relative rib areas.
Another important observation from this study was that stainless steel had on average a lower bond stiffness than A615 steel when comparing bars with similar relative rib areas.
Effect of Epoxy Coating on Load-Slip Response:
The load-slip response clearly demonstrate that the Zbar epoxy coating reduces the chemical adhesion between concrete and the reinforcing steel, however the presence of epoxy does not influence the mechanical bond stiffness and bond strength when comparing A615 bars with similar relative rib areas.
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civil engineering structural | Analysis of the relative rib area of reinforcing bars pull out tests : https://www.youtube.com/watch?v=nT8zy_WHgjE
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This video is to bring you a closer look at the Bradley 9334 towel ring. It is in a satin stainless steel finish as you can see. It’s a traditional towel ring, something that you’re going to see in motel/hotel rooms, probably not middle of the road sort of applications commercial sort of applications like that. Inexpensive towel ring, it’s all stainless steel in a satin finish, there’s a magnet and there’s nothing there. There is a link below this video to the technical data which is really nothing other than link to a product brochure which shows this and its sister related products but then also a link to the instructions and the instructions are very straight forward, you know they give you dimensions of the unit, we’ll go over that stuff now, we’re not going to go over all the points but the assecution pad itself is very typical in that it is 2″ by 2″, its projection is 2-3/8. They give an overall height of the ring itself at 4-3/8, and this is coming in, looks like to me it’s coming in at 4-1/4 with an overall width of 4-7/8, just under 5″, yeah may be the case. The mounting of this is a very typical sort of situation where you’ve got a wall clip and that is held in with that slotted set screw that’s there so if you get a small screw driver and remove that out that wall clip is going to come out. You’re going to attach that to a wall and keep in mind the requirements for ADA compliance, your mount and height. Be sure to review that early before you go attaching this, you don’t want to attach them in the incorrect location. There are actually two screws that are included which is nice. So, once you get the wall bracket attached to the wall those two little fingers there at the top their going to hook into the shoulders of the “T” assembly that you see there, just like that, and once they hook in its secured to the wall even without tightening that set screw. And once you go about tightening the set screw your installation at that point is going to all but complete. Good quality item by Bradley, Bradley is a full line manufacturer of all things commercial restroom related and after you tighten that it’s nice and tight, it’s a good deal. That ring does not come out because of the slotted sort of application that they’ve got there with a couple of wings that are milled into the back of the bracket, and if you watched what I did there, the only way you can get that ring off of there is by rotating it this way, and once it’s installed it will never get that, it’s vandal resistant at that point. Good quality company, Bradley. Their material is of good fit and finish, sometimes they’re a bit long because a lot of what they sell, I think, is made to order combined with a minimum order policy but good quality company, it’s a pleasure being a representative for them. If you have any questions on the Bradley 9334 towel ring or any Bradley product please feel free to reach out to us. Thank you.