解ï¼
(1)ç¨ä¸åæ±äº¤å¹³è¡¡åç计ç®æ件ååï¼
Fab = Gx(AB/AC) = Gx(3000/4000) = Gx(3/4) ï¼æå
Fbc = G/(AC/BC) = G/(4000/5000) = Gx(5/4) ï¼åå
(2)æBCææå强度计ç®è®¸ç¨è·è½½[G]ï¼
Fbc/A1 ⦠[Ï1]
å³ï¼ [G]x(5/4)/A1 ⦠[Ï1]
å³ï¼ [G] â¦[Ï1]xA1x(4/5) =(3.5x10^3kPa)x(0.05m^2)x(4/5) =140kN
(3)æABæææ强度计ç®è®¸ç¨è·è½½[G']ï¼
Fab/A2 [G'] [Ï2]
å³ï¼ [G']x(3/4)/A2 ⦠[Ï2]
å³ï¼ [G'] â¦[Ï2]xA2x(4/3) =(140x10^3kPa)x(0.0006m^2)x(4/3) =112kN
(4)综åä¸è¿°è®¡ç®ç»æï¼è®¸ç¨è·è½½[G'] ⦠112kN
[说æï¼½ï¼
å é¢ç®ä¸ºæååï¼æçæ°æ®å¯è½çéï¼ä¾å¦ï¼
A1 =5x10^4mm^2 ? è¿æ¯ 3x10^4mm^2 ?
A2 =600mm^2 ? è¿æ¯1mm^2 ?
[Ï1] =3.5Mpa ? è¿æ¯35MPa ?
æ 论é¢ç®æ°æ®æ¯å¦çéï¼è§£é¢çæ¹æ³æ¥éª¤æ¯å¯¹çã
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