Q420钢U肋加劲板轴压承载性能试验研究

Experimental Study on Ultimate Axial Compression Capacity of Q420 Steel U-rib Stiffened Plates

摘要:

对4个缩尺比1∶2的Q420钢U肋加劲板进行轴压承载性能试验，分析U肋加劲板极限承载力、破坏形式以及破坏机理。结果表明：4个U肋加劲板极限承载力均达到全截面屈服承载力；受压U肋加劲板的破坏形式分为局部屈曲、整体屈曲和合成屈曲破坏3种；极限状态下，受压U肋加劲板在达到极限承载力前发生局部屈曲，最后发生整体屈曲导致板件破坏；通过板件柔度确定的最易发生屈曲的板件位置与实际破坏位置基本一致，说明板件柔度能够预测U肋加劲板在极限状态下的破坏位置。

Abstract:

Experimental study on the axial compression capacity of four Q420 steel U-rib stiffened plates with the scale ratio of 1∶2 is carried out to analyze the ultimate bearing capacity， failure mode and failure mechanism. The results show that the ultimate bearing capacities of the four plates all reach the full-section yield capacity. There are three failure modes including local buckling failure， global buckling failure and combined buckling failure. Under the ultimate compression state， the local buckling occurs before the plates reach the ultimate bearing capacity， and the global buckling finally leads to the failure of the plates. The failure positions predicted by the element slenderness are same as the experimental results， indicating that the element slenderness can be applied to the failure position prediction of the plates under the ultimate compression state.