The anchoring length of the upper steel bar of the frame beam is ≥0.4Lae 15d bent hook (Lae when anchoring straight), which refers to the longitudinal steel structure of the KL seismic floor frame beam on page 79 of 11G101-1. The fixed length of the upper steel bar extended to the inside of the lateral longitudinal bar of the column is ≥0.4LabE 15d bent hook (the straight anchor of the end support is ≥0.5hc 5d ≥LaE).
Torsion reinforcement is a loaded steel pipe, and the anchorage length of torsion reinforcement is the same as that of tensile reinforcement (main reinforcement). The beam section height hw is greater than 450 should be equipped with structural reinforcement of the beam, and the anchorage length of structural reinforcement is 12d for secondary reinforcement and 15d for primary reinforcement.