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数值分析和构件试验均表明:按实腹式计算方法设计的双拼角钢柱受压承载力明显偏于不安全,应按组合构件计算。当按组合式构件计算方法设计该柱时,各种文献给出的绕虚轴弯曲屈曲临界力的简化计算方法并不一致,有必要根据有限元计算结果校核以上算法的精度,为双拼角钢柱的设计研究工作提供参考。首先列举了3种常见的双拼角钢绕虚轴屈曲临界力的计算方法及原理,然后采用壳单元离散双拼角钢柱,采用ANSYS的线性屈曲模块,计算其屈曲临界力。最后,对比有限元和以上3种算法的计算结果,表明:GB 50017—2003《钢结构设计规范》或ANSI/AISC 360-05《Specification for Structural Steel Buildings》中缀板柱的计算式误差相对较小,推荐使用。
The results of numerical analysis and component tests show that the compressive bearing capacity of Shuangpin angle steel columns designed according to the method of stomatal calculation is obviously unsafe and should be calculated according to the composite components. When the column is designed according to the method of modular calculation, the simplified calculation methods of the critical bending force around the imaginary axis flexural bending given by various literatures are inconsistent. It is necessary to check the accuracy of the above algorithm based on the finite element calculation results, Column design and research work to provide reference. First of all, the calculation methods and principles of the critical stress of the three kinds of common double-jointed angle-bending around the imaginary axis are listed. Then the buckling angle of buckling is calculated by using the linear buckling module of ANSYS. Finally, comparing the results of finite element analysis with the above three algorithms, it shows that the calculation error of the slab columns in GB 50017-2003 Steel Structure Design Code or ANSI / AISC 360-05 Specification for Structural Steel Buildings is relatively Small, recommended.