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利用考虑初始缺陷的双非线性极限承载力分析,对薄壁单板和薄壁箱型柱的局部稳定问题进行计算分析,结果表明:通过设置加劲肋,可有效提高薄壁构件的抗屈曲性能。通过有限元分析,对薄壁单板肋的数量、肋的高度、肋的厚度对屈曲承载力的影响进行了分析,对薄壁构件的加肋方式有一定的指导意义。通过对薄壁箱型柱的有限元计算,验证了这种加肋方式的有效性。实际工程中薄壁构件经过加肋处理后,局部稳定性大大提高,承载力也有明显改善。
The local stability of thin-walled single-wall and thin-walled box columns is calculated and analyzed by using the analysis of double nonlinear ultimate capacity considering the initial defects. The results show that the anti-buckling performance of thin-walled structures can be effectively improved by providing stiffeners . Through finite element analysis, the influence of the number of thin-walled veneer ribs, the height of ribs and the thickness of ribs on the buckling bearing capacity are analyzed, which is of guiding significance for the ribbing method of thin-walled components. Through the finite element calculation of the thin-walled box column, the effectiveness of this ribbing method is verified. The practical engineering of thin-walled components after ribbed treatment, the local stability greatly improved, the bearing capacity has also been significantly improved.