前言为了对受扭转和剪切作用的梁进行精确的计算就必须知道剪切中心的位置。虽然为此所需的一般估算方法(参见文献[1]～[3])已相当成熟,但是要在许多实际情况中应用这些方法还是相当麻烦和费时间的。对于任何非对称的箱形梁截面来讲,不得不用这些一般性的方法来进行计算。但是对于单轴对称的箱形梁截 Foreword In order to accurately calculate the beam subjected to torsion and shear, it is necessary to know the position of the shear center. Although the general estimation methods required for this (see documents [1]-[3]) are quite mature, it is still quite troublesome and time-consuming to apply these methods in many practical situations. For any asymmetrical box beam section, these general methods have to be used for calculations. But for uniaxially symmetrical box beam cuts