圆形减压环力学试验与壁厚对其耗能性能的影响

圆形减压环主要由钢管、铝管套筒和钢丝绳组成,由于其耗能特性强,因此在被动防护系统中得到了广泛应用。在边坡防护工程中,将钢丝绳一端固定,另一端连接在防护阻挡结构上,通过钢管与铝管套筒的摩擦和钢管的大变形来散耗冲击动能。首先分析了圆形减压环的工作原理,并对其力学性能进行了拟静力试验,再利用ANSYS/LS-DYNA软件,研究了圆形减压环在荷载作用下,不同钢管壁厚对其耗能性能的影响。结果表明：随着钢管壁厚的增加,圆形减压环的启动荷载也随之增大;在低速荷载作用下,钢管壁厚对圆形减压环的耗能性能影响较弱,但是随着加载速度的提高,钢管壁厚对其耗能性能的影响明显增加,耗能总量上升明显。

Mechanical Testing on the Ring-brake Energy Dissipater and Influence of Thickness on Its Energy Dissipation Performance

The ring-brake energy dissipater is mainly made up of steel pipe, aluminum tube sleeve and wire rope. For the strong energy dissipation feature, it has been widely used in the passive protection system. With one end of the wire rope is fixed and the other end is connected in the protective barrier structure,the kinetic energy is dissipated with the large deformation of the steel pipe and friction between steel pipe and tube sleeve. In this paper, the mechanism of the ring-brake energy is first analyzed and a pseudo static test of the mechanical properties is conducted and then with ANSYS/LS-DYNA finite element software, the effects of thickness of the steel pipe on energy dissipation performance are explored with the ring-brake energy dissipater under impact load. The results show that： with the increase of the thickness of the steel pipe, the starting load pressure is increased;with the low load, pipe wall thickness has weak effect on energy dissipation performance of ring-brake energy dissipater, but as the loading velocity increases,the effects are significantly increased, and total energy dissipation is also increased much.