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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 Carp’s theorem to solve the relationship between the end-to-end force of the plane beam element and the displacement of the beam end—the stiffness coefficient is simple and easy to implement, especially the element stiffness coefficient when the beam element is elastically supported.