虚位移原理”就转变为至今通用的“虚功原理”.即一个质点系的平衡条件是对所有可能的“位形”变化,要求对每一个质点的“虚功”之和恒为零
虚位移原理”就转变为至今通用的“虚功原理”.即一个质点系的平衡条件是对所有可能的“位形”变化,要求对每一个质点的“虚功”之和恒为零
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