By analysing and discussing the ductility of reinforced concrete beams under flexure, the author gives formula for calculating curvature ductility index of section.
本文对钢筋砼受弯构件的延性进行分析和讨论，提出了截面曲率延性系数的计算公式。
2
In this paper, an integral formula for elliptical flexure hinge is deduced by introducing centrifugal Angle as the integral variable.
以椭圆的离心角为积分变量，得到椭圆柔性铰链的转角计算的积分公式，推导出椭圆柔性铰链的刚度表达式。
3
Based on the simple beam theory, it analyzes the vibrancy character of straight-leg flexure structure, and derives the practical formula of this structure to calculate the resonance frequency.