Where ( L_{crack} ) is an assigned cracked length (typically 5–10% of member length). Alternatively, use based on crack depth ratio ( a/h ):
[ I_{cracked} = I_{uncracked} \times (1 - 2.5(a/h)^2) ] space gass crack
[ k_{\theta} = \frac{EI_{uncracked}}{L_{crack}} ] Where ( L_{crack} ) is an assigned cracked