减压环耗能性能的静力试验及动力有限元分析  

Static tensile test and FEM dynamic simulation for a ring-brake energy disspater

作　　者：汪敏[1] 石少卿[1] 阳友奎 

机构地区：[1]解放军后勤工程学院军事建筑工程系,重庆401311 [2]布鲁克(成都)工程有限公司,成都611731

出　　处：《振动与冲击》2011年第4期188-193,共6页Journal of Vibration and Shock

基　　金：总后基建营房部项目资助

摘　　要：被动柔性防护系统中采用的减压环由钢管及铝管套筒组成,应用中将钢丝绳穿过钢管连接在防护系统的支撑绳及拉锚绳上,起到吸收能量和缓冲冲击荷载的作用。根据被动防护系统中减压环的工作状态,将减压环的受力形式简化为一端固定,另一端受荷载作用,并进行了静力试验和动力有限元分析。在较低的冲击荷载作用下,数值计算结果与试验结果较吻合,随着冲击荷载速度的增大,启动荷载逐渐增大,减压环耗能能力有一定的提高。另外,采用数值计算方法研究了减压环中的铝管套筒长度对耗能性能及启动荷载的影响。结果表明:减压环在动力荷载作用下的耗能能力开始增大比较明显,后期耗能能力无明显增大,而启动荷载随着套筒长度的增大先减小而后增大,当铝管套筒在合适长度范围内时,减压环在动力荷载作用下理想吸能效率与静力试验结果较接近。A ring-brake energy dissipater of a passive system consists of tubular steel loops and aluminum compression sleeves,and steel cables drilled through the tubular steel loops are connected to a anchor rope and a support rope.The ring-brake energy dissipater used in the system is based on their great slip resistance capacity which can dissipate the kinetic energy and alleviates the impact load.Based on the effect of a ring-brake energy dissipater in a passive system,static tensile tests and FEM dynamic simulation were carried out.The numerical results with a ring-brake energy dissipater at the low speed load showed the correlation to the static tensile tests.The slip resistance increased and the energy dissipation performance was improved with the loading speed increasing.In addition,the influences of the length of the aluminum compression sleeves on the sliding force and the dissipated energy of a ring-brake energy dissipater were studied.The results showed that the energy dissipation capacity of the ring-brake energy dissipater increases singificantly in the beginning,but no significant increase occurs lately;the sliding force firstly decreases and then increases with increase in the sleeve length;when the aluminum compression sleeves are in appropriate length range,the ideal energy dissipation efficiency obtained with the dynamic simulation is close to that of the static tests.

关 键 词：减压环 耗能 静力 动力 

分 类 号：U213.83[交通运输工程—道路与铁道工程]