Investigation on Double Thin-Walled Multi-Corner Columns Subjected to Axial Crushing
摘要
This paper presents a comparative study of single-walled (SW) and double-walled multi-corner columns (DWMCC) subjected to axial impact forces. Numerical simulations were performed using the nonlinear finite element code LS-DYNA. The study analyzed SW columns with thicknesses of 1 mm as well as three types of DWMCC: those with four middle ribs (MR), four corner ribs (CR), and without ribs (DW). Wall distances of 2, 3, 4, and 5 mm between the inner and outer walls of DWMCC were examined. This paper will examine the impact of the distance between the inner and outer walls, as well as the effect of different types of ribs on axial crushing, in order to propose an optimal geometry. The results showed that the specific energy absorption (SEA) was highest in the MR columns, followed by the CR columns, the DW columns, and lastly, the SW columns. Compared to the SW column, MR columns exhibit the largest increase in total energy absorption (EA) from 110% to 130.8%, followed by CR columns from 109.8% to 128.2%, and DW columns from 90% to 104.1%. MR column with a wall distance of 4 mm exhibits the highest SEA performance at 18.4%. Following that, the CR column with a wall distance of 3 mm achieves 15.4%. Lastly, the DW column with a wall distance of 3 mm demonstrates the highest SEA performance at 6.1%.