用卡氏定理推求平面梁单元刚度系数

Element Stiffness Coefficients Derived from Castigliano's Theorem

采用卡氏定理求解平面梁单元的端内力与梁端位移之间的关系——刚度系数，简洁易行，尤其是推导梁单元具有弹性支承时的单元刚度系数．

Using Castigliano's theorem, this article deals with solving the relationship between end force and displacement of beam elements stiffness coefficients. As a concise and easy method, it is a new way to solve the stiffness coefficients of elastic supported beam elements.