结合工程实例，采用该模型计算了桩基的自振频率，分析了弹簧等效刚度的变化对模型自振频率的影响。
Meanwhile, the natural frequency was calculated using this method in an example, and the natural frequency affected by the change of equivalent spring stiffness was also analyzed.
提出了两种计算在均布荷载作用下平面支撑框架等效刚度的方法。
Propose tow methods of computing the equivalent support stiffness under uniform loading.
刚度等效方法可以用于其它多层薄壁壳体的计算。
The calculating results show that the method of stiffness equivalence can be used for the calculation of three-layer thin shells.
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