This is a question by a student that I am posting in the forum.
'' I am having a general question that, when a cantilever beam is a part of continuous beam as in most cases ,the main steel of continuous beam is in bottom but in cantilever beam is in top so , the bottom bars of main reinforcement act as hanger bars for cantilever.
But what if the main steel of cantilever is more than the top bars of continuous beam?
And should we extend the extra bars of cantilever upto continuous beam or we shall bend it as per shown in one of your blog on Anchorage length?
I am bit confused in this.
Also the Development length formula doesn't give the length of back extension of bars of cantilever.
So how do we calculate it?''
Basically the question is about two points.
1) In a continuous beam where the last span is a cantelever, and if the cantelever top steel is more than the requirement at the last span support, what needs to be done. Should the bars be separate and bent in to the column?
2) If not what should be the length that needs to be extended in to the beam behind.
The question may not appear to be clear here. I suggest you take a look at the video to understand the question and its answer. I have tried to explain it and also provide more insights on how to use ETABS for better decisions on curtailment of rebars.
You can also additionally read another question and a video here on a similar discussion.