Calculul grinzilor din beton armat Determinarea sectiunii optime a grinzii Distanta maxima intre reazame L= Inaltimea optima hmax hmin Grinzi principale mm 750 500 Inaltime grinda aleasa h= Latimea grinzilor bmax bmin mm Dreptunghiulare 400 200 Latime grinda aleasa b= Calculul incarcarilor permanente Greutatea proprie 5.25 KN/m Alte incarcari 5 KN/m Total incarcari 10.25 Incarcare de calcul 13.8375 KN/m Calculul incarcarilor utile Incarcare utila Incarcare de calcul Momentele de calcul Mcamp= 95.8 KNm Mreazam= 184 KNm Inaltimea optima Latimea grinzilor 600 mm Clasele de expunere X0 XC1 XC2/XC3 XC4 XD1/XS1 XD2/XS3 XD3/XS3 Clasele de expunere XD1/XS1 S1 S2 S3 S4 S5 S6 S1 10 10 10 15 20 25 30 20 25 30 35 40 45 S2 10 10 15 20 25 30 35 S3 10 10 20 25 30 35 40 Grinzi principale Grinzi secundare Dreptunghiulare Sectiune T 750 500 400 300

6m

350 mm

[N/mm] [N/mm] [N/mm]

16 KN/m 24 KN/m

[N/mm] [N/mm]

95800000 Nmm 1.84E+08 Nmm

Caracteristici de material Beton fck f.ck,cube fcm fctm C25/30 25 30 33 2.6 Otel fyk ft PC52 N/mm^2 345 510 c= cc= fcd= fctd= fyd= 1.5 1

fctm,0,05 fctk,0,95 1.8 3.3

Ecm 31

valoare recomandata

16.66667 N/mm^2 1.2 N/mm^2 345 N/mm^2 XD1/XS1 S2 25 mm c.nom= d= 45 mm 560 mm

Clasa de expunere Clasa structurii Acoperirea minima Acoperirea cu beton Inaltimea utila

0 6 8 10 12 14 16 18 20 22 25 28 32 36 40

0 28.3 50.3 78.5 113 154 201 254 314 380 491 616 804 1020 1260

Calculul ariilor de armatura longitudinala Asl= 496 mm^2 in camp Asl= 997 mm^2 pe reazam Stabilirea necesarului de armatura in camp A nr. Bare 2 18 254 0 0 0 0 0 0 bnec 136 350 b -3% 481.12 mm Arez 508 496 Asl 5% 520.8 mm^2

Stabilirea necesarului de armatura pe reazam A nr. Bare 2 20 314 2 18 254 0 0 0 bnec 226 350 b -3% 967.09 mm Arez 1136 997 Asl 5% 1046.85 mm^2

500 400 200 200

S4 10 15 25 30 35 40 45 Otel OB37 PC52 PC60 fyk

S5 15 20 30 35 40 45 50 ft 255 345 405

S6 25 25 35 40 45 50 55

Clasa de beton C12/15 C16/20 C20/25 C25/30 C30/37 C35/45 C40/50 C45/55 C50/60 C55/67 C60/75 C70/85 C80/95 C90/105

fck 12 16 20 25 30 35 40 45 50 55 60 70 80 90

f.ck,cube 15 20 25 30 37 45 50 55 60 67 75 85 95 105

fcm 20 24 28 33 38 43 48 53 58 63 68 78 88 98

fctm 1.6 1.9 2.2 2.6 2.9 3.2 3.5 3.8 4.1 4.2 4.4 4.6 4.8 5

fctm,0,05 fctk,0,95 1.1 2 1.3 2.5 1.5 2.9 1.8 3.3 2 3.8 2.2 4.2 2.5 4.6 2.7 4.9 2.9 5.3 3 5.5 3.1 5.7 3.2 6 3.4 6.3 3.5 6.6

Ecm 27 29 30 31 32 34 35 36 37 38 39 41 42 44

360 510 590

0 1 2 3 4 5 6 7 8 9