介绍可以预测小片荷载下横向加劲钢板梁极限承载力的力学模型。该模型可以较为准确地预测均质钢板梁(腹板和翼缘的屈服强度相同)的极限承载力,但对混合梁来说,必须加入某些修正系数才能得到较为精准的结果。这些修正系数由一系列试验性的校准数值结果推断而出,所得到的公式与EN1993-1-5中的较为一致。 The mechanical model that can predict the ultimate bearing capacity of transverse stiffened plate girders under small plate loads is introduced. The model can predict the ultimate bearing capacity of homogeneous steel beam (the same yield strength of web and flange) more accurately. But for the hybrid beam, some correction coefficients must be added to get more accurate results. These correction factors are inferred from a series of experimental calibration numerical results and the resulting formulas are more consistent with those in EN1993-1-5.