中文摘要：

针对翼缘结构较复杂的工字梁计算局部压力作用下极限承载力的问题，在有限元计算可行性分析的基础上，使用ABAQUS软件对共计224个模型进行了非线性分析，得到逼近实验结果的承载力数据。分析得到了极限承载力与腹板屈服强度、翼缘屈服强度的关系及上、下翼缘分别对极限承载力的贡献。通过对模拟数据的拟合，提出了新的计算极限承载力的方法，指出计算极限承载力的参数应取翼缘的惯性矩和极惯性矩，这样可以避免以几何尺寸作为参数带来的局限性。与实验对比的结果表明，该方法更加合理可行，且当翼缘结构形式较复杂时也能计算。

英文摘要：

In allusion to the calculations of ultimate bearing capacity for I beams with the complicated flange struc？ture, on the basis of the feasibility analysis of finite element calculation, a nonlinear analysis on a total of 224 mod？els was performed by utilizing the software ABAQUS. The results reveal the bearing capacity data were well con？formed to the existing experiments obtained from prior studies. In addition, the relationship between the ultimate bearing capacity and yield strengths of web and flange and the contribution of either top flange or bottom flange to the ultimate bearing capacity were also gained by analysis. By utilizing the fitting of simulated data, a new method of calculating ultimate bearing capacity was proposed in this paper. Taking the flange＇s moment of inertia and polar moment of inertia as the parameters was stated briefly, thus avoiding the limitations produced by using geometric si？zes as parameters. The results compared with the existing experiments show that the present method was more rea？sonable and feasible. Also, structures with more complex flange can also be calculated using the procedure.