本文将半圆梁简化为梁,用中央差分代替一阶微分,推导出弯矩和剪力引起的挠度计算公式,使半圆梁的挠度计算大为简化,并能获得满意的精度。此法属于工程近似计算方法,适用于设计方案的预选和评价,与有限元法配合使用效果更好。此法也适用于一般结构较复杂的梁的刚度计算。 In this paper, the semi-circular beam is simplified as a beam, and the central differential is used instead of the first-order differential to deduce the formula of deflection caused by bending moment and shear force. The deflection calculation of the semicircular beam is greatly simplified and satisfactory accuracy can be obtained. This method belongs to the engineering approximate calculation method, which is suitable for the preselection and evaluation of the design scheme. It works well with the finite element method. This method also applies to the general structure of the beam stiffness calculation.