求多跨静定梁的支座反力~

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求多跨静定梁的支座反力~
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求多跨静定梁的支座反力~
求多跨静定梁的支座反力~

求多跨静定梁的支座反力~
取EC段为隔离体:
ΣME =0,FC.3m -20KN.1m -0
FC = 20/3 KN(向上)
ΣMC =0,-FEy.3m +20KN.2m =0
FEy = 40/3 KN(向上)
ΣFx =0,FEx =0
.
取ADBE段为隔离体:
FEy的反作用力FEy' =40/3KN(向下)
ΣMA =0,FB.6m -(40/3KN)(7.5m) -(10KN/m)(3m)(4.5m) +15KN.m =0
FB =110/3 KN(向上)
ΣMB =0,-FAy.6m -(40/3KN)(1.5m) +(10KN/m)(3m)(1.5m) +15KN.m =0
FAy =20/3KN(向上)
ΣFx =0,FAx =0