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位移合成法是指由梁弯曲变形的近似微分方程导出梁截面间转角及挠度的关系，并利用这种关系来计算截面位移的一种计算方法。这种方法与各种材料力学教科书中所提出的方法都有所不同。它利用弯矩图使得计算更为方便、实用。
The displacement synthesis method refers to the relationship between the rotation angle and the deflection of the beam section derived from the approximate differential equations of bending deformation of the beam, and uses this relationship to calculate a calculation method of the section displacement. This method is different from the methods proposed in various materials mechanics textbooks. It uses the bending moment diagram to make the calculation more convenient and practical.