Page 123 - Water Standards

AnnexB CalculationofInternalForcesof

C y lindricalVentilationBarrel

B.0.1 Theinternalforcesofc y lindricalventilationbarrelma y
becalculatedaccordin gtothesu pp ortconditionsandactionsb y
meansofTableB.0.1 1 TableB.0.1 3andtheformulasin
thetables.
B.0.2 Themeanin gofs ymbolsandthesti p ulationofp ositive
andne g ativesi g nsinthecalculationofinternalforcesofc y lindri-
calventilation:
—
Mx characteristicvalueofverticalbendin gmoment , ositive
p
whentheouterwallisintension,kN·m /m;
—characteristicvalueofcircumferentialbendin gmoment ,
Mθ
p ositivewhentheouterwallisintension, kN·m /m;
—characteristicvalueofcircumferentialforce,tensionis
Nθ
p ositive , kN /m;
—
Vx characteristicvalueofshearforce, forceoutwardisp osi-
tive, kN /m;
M0 characteristicvalueofexternalmoment ,ositivewhenthe
—
p
outersurfaceofthewallisintension, kN·m /m;
—uniformtemp eraturedifference, temp eraturerisin gisp os-
t R
itive,℃;
Δ t—differenceofexternalandinternaltemp eratures , e q ualto
thetemp eratureofexternalwallsurfaceminusthatofin-
ternalwallsurface,℃;
α t coefficientoflinearthermalex p ansionofconcrete,℃ ;
—
-1
E c elasticmodulusofconcrete, kN /m ;
—
2
—Poisson’sratioofconcrete;
ν c
5 1 1