介绍了一种用剪力图和弯矩图求平面平行弦桁架内力的关系式，并利用截面法给出了相应的证明。
By means of the shear-diagram and the bending-diagram, the expressions of the internal forces in the members of the truss are introduced and demonstrated by the cross-section method in this paper.
介绍了一种用剪力图和弯矩图求平面平行弦桁架内力的关系式，并利用截面法给出了相应的证明。
By means of the shear-diagram and the bending-diagram, the expressions of the internal forces in the members of the truss are introduced and demonstrated by the cross-section method in this paper.
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