differential force meaning in Chinese

差动力
差异应力

A more reasonable method to calculate soil ' s damage value is advanced , which bases on extrema of irregular dynamic shear stress . previously it bases on peaks of shear stress to calculate damage value , but by this method the destructive action of multi - point inputted earthquake is overestimated , especially in the second half section of responding shear stress " time history the shear stress caused mainly by differential force undulate slightly on one side of its zero line
以往计算土体在不规则的动剪应力作用下的损伤值根据的是动剪应力的峰值，在时域内多点输入分析中，由于差动力的的存在，使得时程后段动剪应力不穿零而在一侧做幅度不大的波动，基于峰值的损伤值计算特别过高地估计了这段剪应力的破坏作用，过高的程度还随延时增加而增加。