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Structural Analysis
Frame Analysis in Structural Systems
Description
Frames are important parts of many mechanical and structural systems used every day. They are valued for stability and for their ability to bear heavy loads. A frame is built from two-force members and multi-force members, and the parts are connected with pin joints. Trusses are different because they are made entirely of tw...
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Transcript
框架通常是由铰接构件组成的刚性、静止结构,用以形成稳定体系,承受外部施加的荷载。
桁架由二力构件组成,这些构件承受沿其轴线方向的轴向力,如拉力和压力。
相比之下,桁架由二力构件和至少一个受三个或更多力作用的多力构件组成。
它们被广泛用作建筑物梁和柱的结构支撑,以及汽车底盘和起重机、挖掘机等施工设备的结构部件。
为了分析一个受力框架,考虑一个处于平衡状态的起重机吊起重量为 W 的负载的例子。
绘制起重机的受力分析图,以确定作用在框架上的外力。
此外,需对受力图中的每个构件分别进行分析,以确定已知力和未知力。通常,先考虑二力构件。
然后,确定多力构件每个端点和连接点处的作用力。
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