Base on the static equilibrium equation of supports offset, the dynamic equilibrium equation of structure under time-varying base movement is derived, and four different analysis models are presented. A frame structure under seismic excitation is studied using these four models.3.
本文从支座移动时的结构静力平衡方程出发，根据地震动时程输入方式的不同和结构在支座移动随时间变化时的动力平衡方程，总结并推导了多点激励作用下结构地震反应时程分析的四种模型，并以一平面刚架结构为例分析了其理论基础和选择模型的原则。
参考来源 - 大跨复杂结构在多点地震动激励作用下的非线性反应分析·2,447,543篇论文数据，部分数据来源于NoteExpress
So, today I have chosen a ladder as my subject of static equilibrium.
今天我选择了扶梯，作为静力平衡的道具。
In this case, it will rotate about the center of mass, so it's not static equilibrium.
在这个例子里，它会绕着重心旋转，因此不存在静力平衡。
Now... I want to show you some examples of static equilibrium which are not so intuitive.
现在给你们看一些，静力平衡的例子，不那么凭直觉而定。
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