BIM Q&A: How to Adjust Secondary Beam Stirrup Bending from 11.9D to 6.9D in Luban Steel Reinforcement Software?

BIM Q&A | How to Set the Bending Length of Secondary Beam Stirrups to 6.9D in Luban Steel Reinforcement Software? The Default Calculation Is 11.9D

The title doesn’t clearly explain the issue, but it seems to concern the cutting length of rectangular hoop reinforcement. After bending, the outer dimensions are b and h, and the cutting length is L.

For HRB335 and HRB400 steel grades, the formula is:
L = 2b + 2h – 0.44d + 10d (with 20d for seismic hoops).

For HPB300 steel grade, the formula is:
L = 2b + 2h – 1.51d + 10d (with 20d for seismic hoops).

It’s important to distinguish between steel grades because the bending core diameter specified in the standards varies. However, for budget estimations, this level of precision is usually unnecessary.

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