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ID number:476962
 
Author:
Evaluation:
Published: 14.09.2009.
Language: Latvian
Level: College/University
Literature: n/a
References: Not used
Extract

Uzdevums: noteikt piepūles kopnes (shēma 4) stieņos, kura slogota atbilstoši shēmai 4 pie tabulā dotiem izejas datiem.
Kur d=5m, h=3m, q=4kN/m, P1=60kN un P2=20kN.
ΣMA=-6dVB+4,5qd2+3dP1+4dP2=0
VB=(4*4,5*25+15*60+20*20)/30=58,3kN
ΣMB=6dVA-2dP2-3dP1-13,5qd2=0
VA=(10*20+15*60+13,5*4*25)/30=81,7kN
Leņķu noteikšana:
tg α=3/15=0,2 – no tā var aprēķināt α.
α=11,3o - zinot α var aprēķināt arī citus leņķus.
β=78,7o
<3=22,6o
<4=21,8o
<5=68,2o
<6=33,1o
Šķērsgriezuma izvēle pēc noturības nosacījuma.
Pieņemam ka kopnes stieņi ir no tērauda un kura pieļaujamie spriegumi doti tabulā, [σ] =160 MPa , visslogotākie ir N1-2=-358,5 kN. No dotajiem datiem varam apreiķināt stieņa šķērsgriezuma laukumu, izmantojot formulu N/A≤[σ].
a)[σ]=160 MPa, N=358,5 kN
N/A≤[σ]
A≥N/[σ]
A≥358,5·103/160·106
A≥22,40 cm2…

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