NZS 3101 Rebar Toolkit

Web version of the NZS 3101 reinforcement toolkit covering development length checks and minimum bend diameters. Report output now follows a professional, specification-style layout.

Development Length

General Inputs (MPa, mm)

f'_c (MPa) f_y (MPa) d_b (mm)

Top bar (fresh concrete > 300 mm below)

Calculation Options

Type

Show detailed steps Plain bar/wire in compression (8.6.6)

Refined Parameters (Eq 8-3) & Hook Factors

A_s (mm²) A_req (mm²) c_m (mm) A_tr (mm²) s (mm) f_yt (MPa) n (terminating bars)

d_b ≤ 32 mm Side cover normal to hook plane ≥ 60 mm Tail cover (90° hooks) ≥ 40 mm Confined by closed stirrups/hoops (≤ 6 d_b)

Minimum Bend Diameter

Report

Disclaimer

This tool transcribes NZS 3101:2006 provisions for convenience. Verify all inputs, assumptions, and outcomes against the latest standard and project requirements.

Made in New Zealand · Beta in progress

NZS 3101 Rebar Toolkit

Development Length

General Inputs (MPa, mm)

Calculation Options

Refined Parameters (Eq 8-3) & Hook Factors

Report

Minimum Bend Diameter

Report

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