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| Applies To | ||

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| Product(s): | STAAD Advanced Concrete Design | |

| Version(s): | All | |

| Environment: | N/A | |

| Area: | Concrete Design | |

| Subarea: | Column & Shear Wall | |

| Original Author: | Shreyanka Bhattacharjee Bentley Technical Support Group | |

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**What is the basis for only 20% of vertical reinforcement is considered for the calculation of Shear capacity (Tc)?**

Based on the IS 456, Only tension reinforcement is to be considered for shear capacity (Tc) calculation. We can assume at- least 30 to 40% reinforcement would be under tension in a given load combinations. Also, the effective depth as per code is suggested to be considered as 0.8 x the total depth for the shear calculation. Considering both the criteria, it is assumed that the only 20% of the main reinforcement of entire wall would be in tension. It is also very difficult to identify the % tension reinforcement in wall for combination which is critical in shear. This has been discussed with the professor on the code panel in technical presentation of IS 13920-2016 and suggested to use only 20%of the main reinforcement in the shear calculation.