I'm been reading ACI 318 Appendix D
So pryout (edge breakout) of anchors can occur for 16mm if the edge distance is less than 80mm (3 inches)? So none of you put any anchor that is less than 3 inches from edge?
What happens if another metal plate would be welded at the side of the concrete...
whats the technique that you use to put leveling grout under base plate? do you first put grout or the baseplate? if you first put the grout.. do you need to put formworks? any grout that doesnt requirement formworks? or do you put the grout after the base plate is put by injecting the grout...
That's why I am reviewing the contractor plans. I know welding the threaded bolts to the metal plate is not allowable.. but what is the reason? Is it because the welding only bind the upper part of the metal plates and there is not enough locking force for it? What else.. I need to write a...
In reinforced concrete structure.. the rebars are mostly to do with yield strength. How about in anchor bolts.. does yield strength dominate or shear strength (3/4 of yield strength) or is it more of development length of the anchor bolts (and others).. which dominate mostly? How do you compute...
I'm talking of exposed wide flange delivered to site and it rained before it is primered either by red oxide or epoxy primer. Just one day of exposure can rust a steel.. so what do you usually do with the rusted exposed steel before applying primer.. do you clean it away with clothe or just...
Actually there are already 4 existing 16mm J-bolts of length 7" imbedded inside the corner bars inside stirrups. The middle add-on additional anchor bolts are for increase safety margin because the designer doesn't know the exact condition of the existing bolts.
For the bolts already in the...
Some of us are only familiar with bars in reinforcement concrete. Is there any rough guidelines or references to practicing engineers on the forces of anchor bolts on concrete pedestal... I'd like to double check on existing plans with regards to the strength of anchor bolts placement and...
After all the wide flange and purlins were delivered to the site.. it rained before we put epoxy primer on the steel. Do you need to remove every bit of rust before putting epoxy primer? What do you usually do?
Usually how many micrometer of depth does the rust penetrate into the steel per day?
again this is to emphasize the base plate will not be used as column but as rafter middle support.. again
Ill bring the 16mm thick plates to the machine shop tomorrow to see if they have the equipment to drill it.
Now id like to ask if you guys put structural epoxy underneath base plate...
The metal plates have not yet been connected. I don't have budget to buy thousands of dollars of drilling equipment just for those few metal plates that I'd not do again.
I plan to just go to machine shop. Hope they have the technology to drill such thick plates. Most of their experience are...
The hole is 16mm size for this:
If you use a normal electric drill (SDS) with 16mm drill bit.. can you cut thru the 16mm thick plate (so as not to be confused.. both the thickness of metal plates and hole is 16mm)??
The metal plate is half meter by half meter long.. there will be about 6...
The anchor bolt won't be used on a column. But on central support of rafters that is size w8x21 (vertical support is same size). See
It's written anchor bolts. Designer gave and said no specific spec but just 16mm anchor bolts. So I wonder if I can use the Hilti mechanical bolts. Which model...
Hi,
What do you use to drill 16mm metal plates? Normal drill may not work..
What is your comment on the technique of using acetylene torch to put a hole in the metal plates? But it doesn't exactly put a 16mm hole.. but bigger.. so if you use a washer and nut. would it no longer be an...
Hi, what is the difference between expansion bolts and anchor bolts? Both to be put after (drilling) because there is already existing concrete.
In the plan above. It specifies expansion bolts. I plan to get the Hilti anchor bolts because of tested specs. Are their anchor bolts also considered...
I'm just studying the work of a design for more knowledge. Here the span between columns is 18 feet. He used w8x21.. with c-purlin distanced 2 foot apart using 2x6" 0.07" C-purlin and corrugated light roofing material on top of c-purlin like the following.
x---------x---------x
| | | | | | |...
Yes, each rafter will still tend to shift laterally between columns.
By flexing laterally, are you talking mainly about lateral torsional buckling?? If you are describing the wide flange just bending up and down.. but it's not supposed to do that with the light load of roofing.. would it...
How do you utilize the "weak axis flexural stiffness of the rafters themselves"? By selecting stronger beams with larger section modulus in the Wy axis? Are you also stating that there is weak axis bending when each rafter shifts laterally? But the rafters were welded on top of column so how...
There is no roof diaphragm or shear rated decking or discrete, in-plane bracing. But we can easily accommodate middle column support beneath it. If we do that.. what becomes of the requirements for each rafter to be laterally restrained?
It is sloped.. so it's not like connecting them straight which can give bad deflection. The original plan was to have middle support, but we are studying now if it is possible with no support. The load is only light roofing cover and not steel deck or floor or loading is not a problem. But I'd...
