林小琪 發問時間: 科學工程學 · 5 年前

求此題解~~~拜託了~~~?

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1 個解答

評分
  • 麻辣
    Lv 7
    5 年前
    最佳解答

    ΣM2 = R1*1250 - 9000*750 = 0

    R1 = 900*750/125 = 3600 N

    R2 = 9000 - 3600 = 5400 N

    V1 = R1 = 3600 N downward

    V2 = R2 = 5400 N upward

    M(max) = R1*750

    = 3600*750

    = 27*10^5 N.mm

    Z = bh^2/6

    = 100*150^2/6

    = 375000 mm^2

    S(max) = M(max)/Z

    = 27*10^5/375000

    = 7.2 N/mm^2

    = 7.2 MPa

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