From the genealized one, the extended principle of virtual displacements for static systems is deduced, including the classical one.
由此推得静止系统的虚位移原理（扩大），它包含古典的虚位移原理在内；
The extended principle of virtual displacements is also proved by another method, which is used customarily to prove the classical one.
用证明古典虚位移原理的传统方法证明虚位移原理（扩大）。
This paper presents a method of using the principle of virtual displacements directly to obtain the ordinates of the influence line for frames.
本文阐述了直接用虚位移原理计算刚架影响线纵距的方法。
This paper presents a method of using the principle of virtual displacements directly to obtain the ordinates of the influence line for frames.
本文阐述了直接用虚位移原理计算刚架影响线纵距的方法。
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