Abstract

Thin-walled structures have an inherent shortcoming that their cross sections are likely to flatten when subjected to transverse loading. In the paper, four simple novel reinforcement configurations into the thin-walled square tubes are put forward, and their bending resistance under three-point bending is investigated using the ABAQUS/Explicit code. The numerical results indicate that the reinforcements considerably enhance the structural bending resistance by effectively restricting the flattening of the upper compressive region of the cross sections. The variational characteristic of the maximum loads and the mean loads with the variables for the four reinforcing configurations is analyzed. The two key indicators SEA (specific energy absorption) and CLE (crash load efficiency) are introduced to further evaluate their energy absorbing and safeguard performance. It is found that one of the suggested reinforcement configurations significantly improve the values of SEA and CLE by 93.5%, 68.1% respectively, compared with the conventional empty tube.

摘要

薄壁结构有一个固有的缺点，即它们的横截面在承受横向载荷时可能会变平。在本文中，提出了四种简单的新型薄壁方管加固配置，并使用 ABAQUS/Explicit 代码研究了它们在三点弯曲下的抗弯性能。数值结果表明，加强件通过有效地限制横截面上部受压区域的扁平化，显着提高了结构的抗弯曲性。分析了四种钢筋配置的最大荷载和平均荷载随变量的变化特征。引入SEA（比能量吸收）和CLE（碰撞负载效率）两个关键指标，以进一步评估其能量吸收和保障性能。结果表明，与传统的空管相比，其中一种建议的加固配置使 SEA 和 CLE 的值分别显着提高了 93.5% 和 68.1%。