介绍了一种平面杆系结构自由振动的解析解法。
The analytic method for the free vibration of plane frame structure is presented.
结合平面杆系结构分析的实例，探讨了面向对象方法在建筑结构分析程序设计中的应用。
A practical example of application of the object-oriented method in plane rod system structure is given.
采用平面杆系单元进行结构的承载力检算，采用3D实体单元进行梁体荷载响应模拟。
Plane linkage element is used to calculate bearing capacity of the structure, and 3D solid element is used to simulate response of the beam to load.
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