bend rebars - tension + shear reinforcement?
bend rebars - tension + shear reinforcement?
(OP)
Hi, im looking at some old projects.
When it comes to RC beams I see that almost always bottom (tension) reinforcement is bent to 45o before it reaches supports. Does that mean that reinf. bars that are bend like this actually have 2 functions - as bending reinforcement and a shear reinforcement? im asking this because there are as always classic stirrups too.
Do they bend bars like that for that purpose (extra shear resistance) or is that just a way to anchor bars at the top of a beam?
In my country they rarely use bend bars for shear reinforcement and if they do, they do not add extra stirrups. So whats the deal?
I hardly believe that they design shear reinforcement in a way that some are stirrups and some are bend bars - that is in my opinion unnecessary complication.

When it comes to RC beams I see that almost always bottom (tension) reinforcement is bent to 45o before it reaches supports. Does that mean that reinf. bars that are bend like this actually have 2 functions - as bending reinforcement and a shear reinforcement? im asking this because there are as always classic stirrups too.
Do they bend bars like that for that purpose (extra shear resistance) or is that just a way to anchor bars at the top of a beam?
In my country they rarely use bend bars for shear reinforcement and if they do, they do not add extra stirrups. So whats the deal?
I hardly believe that they design shear reinforcement in a way that some are stirrups and some are bend bars - that is in my opinion unnecessary complication.







RE: bend rebars - tension + shear reinforcement?
RE: bend rebars - tension + shear reinforcement?
I am currently working with this kind of reinforcement in a building in the US dating from 1911/1916/1924 (depending on which part of the building). I have also see it in joist construction elsewhere from the 1905-1930 period, and later.