Hi,
I am looking to cast a series of vertical bars into a concrete slab / wall. THe bars would possibly be plain bars and cat in using HIT HY 200 A resin. The forces on each bar are simply shear and moment, the moment can be resolved into compressive bearing pressures on each side of the bar into the resin. I can't see that this is covered in the profis software and I can't find and information on it, but I feel it is something which is commonly done. Are you able to offer me advice on how to validate that by design? I can do it easily if using grouts rather than resin, but I feel using resin would be a better solution on site and probably a stronger soluition for the project.
Hi , Thanks for your question . If you have access to the Profis Engineering software you can utilise the Post Installed rebar module and the wall to slab you can model your moment, shear, compression or tensile load using ribbed rebar and our injection resin. Justification is via the methodology EOTA TR069 Design method for anchorage of post installed reinforcing bars with improved bond-splitting behaviour as compared to EN1992-1-1.
Hi,
OK, I have looked at that, but I can't seem to define a single bar arrangement at it insists on having a concrete beam in the equation - that concrete beam would in part resist the moment which isn't what I want as it will take force away from the cast in bar. I just want to consider a bar in isolation, set into the supporting concrete. For context, these bars are vertical bars in a balustade so are each subject to a small shear and moment.
Hi, Ok a single rebar is different again, there is an option to model a single bar in the PIR module as a 'lap' based upon the criteria of a damaged bar or missed bar so a new post installed bar is required. In this situation the design method is EN1992-1-1 which limits the load being applied to a compression or a tensile load only. Re your beam comment I wonder if you have the Extension at support selected. Now that being said you can always model a single rebar under an 'Anchor Design' so EN1992 Part 4 which would allow tensile , compression, shear or a moment - must use a baseplate however for this but you would be subject to the design constraints of this design approach such as max embedment 20 x d , concrete cone failure, spacing, edge distance limitations and the shear load acting on the rebar and not concrete roughening etc.
OK, I feel I would better carrying out a simple hand calculation for my situation. Do you give allowable bearing stresses for the resins you use or do you simply know that the resins are stronger in bearing than the concrete grades they are validated for?
Would there also be any limits on the sizes of the hole around the bar?
Hi, the ETA's for the desired resin product can be found on your local Hilti website and, within that you will find the bond stress for the relevant design method, hole diameter and the correct installation process.