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§3 平面刚架和曲杆的内力图

F s. F N. F N. F s. F s. F N. F s. M. M. M. M. F N. 刚架 ： 由两根或两根以上的杆件组成 , 并在连接处采用刚性连接的结构。. 当杆件变形时，两杆连接处保持刚性，即角度（一般为直角）保持不变。. 节点处的平衡关系. 刚节点. 横梁. 立柱. §3 平面刚架和曲杆的内力图. 在平面载荷作用下，组成刚架的杆件横截面上一般存在轴力、剪力和弯矩三个内力分量。. . 例题 4.18. B. C. L. q. L. A. 求做图示刚架的内力图. qL/2. qL. qL/2.

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§3 平面刚架和曲杆的内力图

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  1. Fs FN FN Fs Fs FN Fs M M M M FN 刚架：由两根或两根以上的杆件组成,并在连接处采用刚性连接的结构。 当杆件变形时，两杆连接处保持刚性，即角度（一般为直角）保持不变。 节点处的平衡关系 刚节点 横梁 立柱 §3 平面刚架和曲杆的内力图 在平面载荷作用下，组成刚架的杆件横截面上一般存在轴力、剪力和弯矩三个内力分量。

  2. 例题 4.18 B C L q L A 求做图示刚架的内力图 qL/2 qL qL/2

  3. 例题 4.19 2kN B C 4m 4m 2kN/m A 求做图示刚架的内力图 8kN 24kNm 2kN

  4. C C C B B B q D D D q B B C D C a a a 2a 2a A A A E E E A A E

  5. 例题 4.20 A L1 L2 F 等截面折杆ABC的A端固定在墙上,自由端承受集中力F=20kN.设L1=2m,L2=1m,θ1=450,θ2=900,试作折杆的剪力和弯矩图

  6. 图示杆ABC由直杆和半圆组成,试作该杆的内力图.图示杆ABC由直杆和半圆组成,试作该杆的内力图.  例题 4.21 r B C F 2r A AB: BC:

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