Placa acoperis

Ap+At *1.4

*t*l [act p sup]

Placa intermediara

L2/l1 >2 => o directie

Hp 1/35*a

Hp*2500

[Act p inf] (Ap+At + hp*2500)*1.4

gr. Sec curenta

h = t/20

b = ½…1/3 * h

[eval g] h * b * 2500 * 1.4

[act p inf] * a + {[eval g]} [act tot gr sec]

Gr sec marg.

[act p inf] * 1/2a + (perete * H * 1.4) + {[eval g]}

gr sec inter

[act tot gr sec] + (perete * H * 1.4)

Gr principala

h = 1/8…1/15 * L

b = ½…1/5 * h

greutate proprie = h * b * 2500 * 1.4

echiv concentrat