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Structural Analysis
Truss Forces Using the Method of Joints
Description
The method of joints is used to find the forces in structural trusses. It relies on equilibrium, which means the forces at a joint must balance. In this model, the truss members are connected by frictionless pins.
For a plane truss, the members lie in the same plane. That means each joint has a c...
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Transcript
节点法是一种用于分析结构桁架中受力的技巧,其基于平衡原理。
假设桁架各杆件通过无摩擦铰接连接,则可通过分析作用在该节点上各力的平衡来确定每个节点的受力情况。
由于平面桁架的杆件位于同一平面内,每个节点都受到共面且共点的力系作用。
应用节点法时,需识别桁架中的所有节点并对其进行标注。
接下来,隔离并绘制每个结点的受力图,标出作用在该结点上的所有力。根据所施加的力,桁架中结点所受的拉力和推力分别称为拉力(张力)和压力(压缩力)。
节点上的未知成员力始终假定为受拉状态。
最后,通过将作用在该节点上的力在水平和竖直方向上进行分解,并应用静力平衡原理,求解未知力。
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