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I'm also learning through books. So excuse me if my comment is irrelevant. Don't know about ACI. However I feel like you should not consider the concrete (the cover) below r/f for any analysis purposes. It would develop some degree of negative moment, but I feel it's negligible considering you...

Thank you 😊

what do you mean? I have already mentioned it in the next line as "Ast = 0.01 bh".

I'm trying to understand the concept behind the axial force calculation from steel stress. This is from "Reinforced concrete design to eurocodes" by prab bhat, page 368. I'm bit confused of why in the "0.002 bh/4", 0.002 bh is divided by 4. The steel percentage is 4%, and there are 4 bars. So...

@IDS Thank you for the explanation. Now I understand. So, it should be the "distance from extreme compression fibre for each axis".

@IDS You're right, let's say strain can be different, but why x/b - 0.5 would be having different values? shouldn't it be like "+0.3" and "-0.3" as the "x/b - 0.5" should be the relative distance to y axis from reinforcement? I'm trying to understand the equation mentioned in the book in...

@IDS I also think the same. They have made the example more confusing.

@HTURKAK Thank you. I decided to ignore both the 0.15h and 0.35b mentioned in the question. Further, isn't the following part of the equation for the distance to r/f bars from the y axis? So shouldn't they be equal? But if I use the given coordinates I get different distances. For example...

I'm trying to understand the concept behind this bi-axial bending calculation. This is from "Reinforced concrete design to eurocodes" by prab bhat, page 368. I'm bit confused of how the coordinates are calculated for this. For instance, the book states "The bars are located at 0.15h from top...

@hardbutmild Thank you for the calculation. It's very helpful to understand the concept for practical applications.

@Celt83 Isn't it required to assume that the moment taking axis as the neutral axis as well to build the chart? or else how can you calculate "lamda x" if the actual neutral axis is unknown. I feel like we have to assume the "x" as the distance to the neutral axis? (also the 0.5h) If we...

@Celt83 Thank you for the reply. It extended my understanding on this. Now I can clearly see what's happening.

@hardbutmild Thank you for the reply. But still I had the problem where does the "0.5 (h-lambda x)" come from? I realised, no matter what it just ends up in the neutral axis of the section. It's a weird equation though. Now I understand.

This was taken from the book "Reinforced concrete design to eurocodes - by prab bhatt" at page 353. I'm trying to understand this equation. And trying to calculate moment capacity for a compression area of a uni-axial concrete column. In that equation, the moment capacity should be "Cc x...

@HTURKAK Thank you, I will look more into it and further go through the methods you mentioned.

@hardbutmild Thank you. I will look more into the breslers.

@HTURKAK But the Bresler's method is only to check if the dimensions of the column is safe isn't it? as I see it doesn't provide a total design solution (with the reinforcement area + where to place them etc are missing). The prab bhatt's book provides comprehensive solution. Only thing is that...

I'm trying to understand and produce a design chart for chamfered columns. For biaxial bending I found the following in the book 'reinforced concrete design to eurocodes' by prab bhat (page 365). However I want to design chamfered columns. Is it possible to change the following equations to suit...

Thank you for your reply. As I see, Cc is just safety factors multiplied by the concrete strength and area that resist the axial load. If you focus on the concrete area, it's just "b x lambdaX". That means that area must resist "Ned" to have a safe column section for axial load. That means if...

Thank you for your reply. I understand you need to check for "moment only and zero axial load" as a load combination to mimic and compensate construction phase loadings. However, if you're checking the column for the "moment only and zero axial load" as you're saying as a load combination...