解答上圖題目:
ΣMA =0, FB.6m -6KN.4m +12KN.m =0
FB =2KN (↑)
ΣFy =0, FAy +FB -6KN =0
FAy +2KN -6KN =0
FAy =4KN (↑)
ΣFx =0, FAx =0
.
解答下圖外伸梁題目:
ΣMA =0, FB.4m -10KN.2m -(2KN/m).2m.(4m+1m) =0
FB =10KN (↑)
ΣFy =0, FAy +FB -10KN -(2KN/m).2m =0
FAy +10KN -10KN -4KN=0
用合力矩方程驗算FAy :
ΣMB=0, -FAy.4m +10KN.2m -[(2KN/m).2m].(1m)=0
得: FAy =4KN(↑),與上述計算結果相同。
解答上圖題目:
ΣMA =0, FB.6m -6KN.4m +12KN.m =0
FB =2KN (↑)
ΣFy =0, FAy +FB -6KN =0
FAy +2KN -6KN =0
FAy =4KN (↑)
ΣFx =0, FAx =0
.
解答下圖外伸梁題目:
ΣMA =0, FB.4m -10KN.2m -(2KN/m).2m.(4m+1m) =0
FB =10KN (↑)
ΣFy =0, FAy +FB -10KN -(2KN/m).2m =0
FAy +10KN -10KN -4KN=0
FAy =4KN (↑)
ΣFx =0, FAx =0
用合力矩方程驗算FAy :
ΣMB=0, -FAy.4m +10KN.2m -[(2KN/m).2m].(1m)=0
得: FAy =4KN(↑),與上述計算結果相同。