On this basis, the simplified tri linear analytical method to determine bi directional shearing capacity is presented afterwards and the error of this method is given.
同时本文作者提出了双向受剪承载力的三折线简化计算方法，对简化计算方法的误差进行了分析。
2
A new spherometer based on self-reference laser shearing interferometric technique is described The principles and error analysis of the spherometer are given in detall.