RCDC-Ductile design of RCC columns using Indian Standard (IS 13920)

Dear sir,

Regarding Ductile design of RCC columns using RCDC, We have some questions as follows:

As per the relevant clauses of IS 13920 (2016), Two types of ‘Joint checks’ have been introduced. They are – 1)
Relative Moment Strength at Joint, 2) Shear check at joint. RCDC checks for both in the ‘Column’ module. The
detailed calculation report for the same is available separately as well as for each column.

1. Relative Moment Strength – In this check ‘Moment Capacity of Column’ is compared with ‘Moment
Capacity of Beams’ framing into the same. For this check, RCDC reads end-forces of beams connected
to the columns. For the governing moment, it calculates Ast-required and details the top and bottom
reinforcement. This reinforcement is further used to perform this check. The same method is being
used already for ‘Shear capacity check of columns’.

2. Joint Shear Check- In this check the shear demand at joint is calculated as per below fig,

As per the above, we confuse how to adjust the reinforcement of beams when beam-column joints failing. 

Regards 

Liyanan