Hi Yes if you bend stirrups past 90° the ends will lock more in concrete when stressed during earthquake. All my build they are 90°. Anyway as long as they are not in the same line (alternate) they should be strong Anyway. Some of rebars are 3 to a side. I would make 3 top and bottom as the centre is neither compression or tension were the center is neutral and not as effective in loading, however it seems to be a common way in the Philippines.
Hey Jep Jack again. well done. I see your beams are longer than 4 meter. In all the beams you need under in length absolutly minimum 3 rebars 16 mm in length. Please do that in all your beams because of negative bending The presure of negative bending is so big cause of the lenght of the beams. Also you need a crank bar in the beams. Check that out on you tube. I see now the forman make beams with 2 rebars in lenght under. If you do not change that you will regret it over one year. Check that also on you tube you can find it there to. Its your house it must be safe you pay for it. The PH are nice builders but no degree about strongnes with rebar in the concrete. Also only poor the concrete in the beam forms when they are ALL ready. The poor must absolutely be done in ONE POOR in all the beam forms. Regards Jack
Jack, I went over the beam construction with my builder today. He is using 16mm, and there are 10 continuous rebar for each beam. They don’t use crank bars for residential builds but instead use cut bars or bent bars. There are an additional 5 rebar/cut bars in the beams. They are bent in the ends. Thanks again for the heads up!
