高强钢焊接薄腹工形截面双向压弯构件的稳定性

应用ANSYS有限元,分析了Q460高强钢焊接薄腹工形截面双向压弯构件的稳定性能,提出了可供实际应用参考的设计公式。分析中考虑的主要参数有腹板高厚比,构件长细比,翼缘宽厚比及荷载偏心率。结果表明,对受压为主的构件,腹板局部屈曲对构件稳定承载力影响较大,而对受弯为主的构件,这一因素对构件稳定承载力影响较小。有限元分析结果与现行规范方法计算结果比较表明,目前规范方法尚不能较好地计算高强钢焊接薄腹工形截面双向压弯构件的稳定承载力,因而提出了修正直接强度法,该法精度较好且偏于安全。

Stability analysis of welded Q460 I-section columns with slender web under biaxial bending

Applying the ANSYS FE, the paper analyzed the stability behavior of welded Q460 I-section columns with slender web under biaxial bending and proposed practical formulas for predicting the stability capacities of such members.Parameters considered in the analysis included web slenderness, member slenderness, flange slenderness and loading eccentricities. The results showed that the detrimental effect of web local buckling on the stability capacity of the member is more significant for axial load dominated members than for bending moment prevailed members. Comparison to the current code method showed that the later can not accurately predict stability capacities of such members. The proposed modified DSM method demonstrates rather good accuracy, meanwhile is safe.