Crack Width Calculator (GB 50010)

Member type

Force type

Concrete grade

Rebar grade

Exposure class

Stress input

Section width Millimeter(mm)

Section height Millimeter(mm)

Cover depth Millimeter(mm)

Bar diameter Millimeter(mm)

Bar count

Service moment Ms kN·m

Calculated crack width: - Millimeter(mm)

Crack limit wlim: - Millimeter(mm)

Limit utilization: -

Effective depth h0: - Millimeter(mm)

Steel stress σs: - N/mm²

Tension steel As: - mm²

Effective tension Ate: - mm²

Effective ratio ρte: -

Non-uniformity ψ: -

Force factor αcr: -

Result: -

Notes: -

Estimate maximum crack width w_max per GB 50010 §7.1.2 for beams/slabs and compare with exposure-class limits.

For learning and preliminary checks only—final design needs a licensed engineer. Runs locally in your browser.