Scara elicoidala dublu incastrata cu vang central si trepte in consola

Unghiul de desfasurare b= Unghiul de panta y=

Raza(centrul grinzii) R= Inaltime etaj hn=

Dimensiuni grinda b= h= Lungime grinda LGR=

Incarcare grinda q= Acoperire beton a=

b/2r= b/h= 0,8 y 26 27

90 1 30

Xr/R2= XX/R=

Momente incovoietoare si de torsiune date de sarcina exterioara 1kN/ml proiectie oriz pe sistemul de baza

mrw=-R2Q(1-cosQ) msw=-R

2Q(1-sinQ)siny mtw=-R

2Q(Q-sinQ)cosy

Momente incovoietoare si de torsiune in grinda pt Xx=1

mrx=RQsinQtgy msx=Rcosy(sinQ+QcosQtg2y) mtx=Rsiny(QcosQ-sinQ)

Momente incovoietoare si de torsiune in grinda pt Xr=1

mrr=cosQ mss=sinQsiny mtr=sinQcosy

Momentele finale

Mr=mrw+XXmrx+Xrmrr Ms=msw+XXmsx+Xrmsr Mt=mtw+XXmtx+Xrmtr

Xr/R2

C= XX/RC= Xr= Xx=

Q= 0 mrw= 0 mrx= 0 mrr= 1 Mr=

msw= 0 msx= 0 msr= 0 Ms=

mtw= 0 mtx= 0 mtr= 0 Mt=

Q= 45 mrw= mrx= mrr= Mr=

msw= msx= msr= Ms=

mtw= mtx= mtr= Mt=

Q= 90 mrw= mrx= mrr= Mr=

msw= msx= msr= Ms=

mtw= mtx= mtr= Mt=

Q= 135 mrw= mrx= mrr= Mr=

msw= msx= msr= Ms=

mtw= mtx= mtr= Mt=

Clasa de beton : Rezist compres beton Rc=

Otel longitudinal : Rezist intindere beton Rt=

Otel etrieri : Modul elasticitate beton Eb=

Rezist armatura longit. Ra= Modul elasticitate otel Ea=

Rezist etrieri Ra=

Latime. b= cm Inalt.h= cm a= cm Coef. Siguranta SLU

w

per

Mt 3 20 + 0 40 + 0 32 1,14

Ms 2 16 + 0 32 + 0 32 2,74

pet=Mt/bbshsRa= procent armare transversala din moment torsiune

Aenec=aepeb/200= cm2 >

ae= cm2 1 18 suplimentar din Mt

At=Mt(bs+hs)/(bshsRa)= cm2