參考答案:
(1)圖5-6-13 R
=qa(↑),R
=qa(↑) AC段: V(
)=R
=qa(0<
<a) M(
)=R
·
-qa
。絨a
-qa
(0≤
<a) CB段:
(2)圖5-6-14
BC段: V(
)=2
(0≤
≤2) M(
)=-
(0≤
<2) CA段: V(
)=2×20=4kN (2≤
<4) M(
)=-2×2(
-1)+80=12-4
(2<
<4) (3)圖5-6-15
相關(guān)知識:五、材料力學(xué)