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ID number:608739
 
Author:
Evaluation:
Published: 24.01.2011.
Language: Latvian
Level: College/University
Literature: n/a
References: Not used
Extract

Pārbaude
1) Stiprības pārbaude pēc normālspriegumiem
δ=Md/C1*W < Ry x γc
Ry x γc = 240000 kN/m2 = 240 MPa
δ = Md/(C1*W)= 117.48/(1.12 x 447) = 117.48/500.64= 0.234 = 234 MPa < 240 MPa
Secinājums: Stiprība pēc normālspriegumiem ir nodrošināta.
2) Stiprības pārbaude pēc tangenciāliem spriegumiem
τ =Qd/tw x hw < Rs x γc
τ =Qd/tw x hw= 93.23/0.007 x 0.198 = 93.23/0.00138=67557.9 kN = 67.55 MPa < 139 MPa
Rs x γc = 139(Mpa),
kur Rs = 0,58*Ry = 0,58*240=139 MPa
Secinājums: Sijas stiprība pēc tangenciālajiem spriegumiem ir nodrošināta.
3) Pārbaude pēc deformācijas
f/l = 5 x qn x L3/384 x E x I < [f/l]
[f/l] = 1/250 = 0.004
E = 2.06 x 105 MPa
f/l = 5 x 7.2 x 4.73 x 103 / 384 x 2.06 x 105 x 106 x 4422 x 10-8 = 3737.628/3497978.88= = 0.00106 < 0.004
Secinājums: Sijas relatīvi faktiskā deformācija nepārsniedz pieļaujamo relatīvo robežizlieci.

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