柔性拦截结构中减压环动态力学性能试验研究

DYNAMIC MECHANICAL PROPERTY STUDY OF BREAK RINGS IN FLEXIBLE PROTECTIVE SYSTEM

减压环是柔性拦截结构中的重要耗能部件,对结构的能量耗散及过载保护有着重要作用。该文分别开展GS-8002型单减压环和减压环组的拟静力拉伸试验、重物下落动力试验和足尺冲击试验。分析不同试验条件下减压环的变形和受力特征。试验表明:动荷载作用下,启动荷载增大,并联减压环组增幅最大;减压环的拉力曲线具有明显的脉冲特性,串联减压环组的脉冲效应更为突出,且靠近整体系统一侧的减压环变形较大,靠近固定端一侧的减压环变形较小,并联减压环组和单减压环的脉冲效应相近。提出考虑动力特性的减压环四折线力学模型,该模型能够较好的反映减压环的工作性能特点。基于该分析模型,给出不同试验工况下GS-8002型减压环性能指标的等代关系,便于实际工程中的设计与应用。

Break rings are important energy dissipation components in a flexible protective system,which plays a key role in energy dissipation and over-load protection for the system.The single break ring and the break rings groups of GS-8002 are conducted on quasi-static tests,on the dynamic tests based on weights,and on full-scale impact tests.And then the deformation and mechanical characteristics of the break rings in different test conditions are analyzed.It is shown that:under the influence of the dynamic load,the staring force increases,the parallel break rings group had the largest increase.The tensile strength curve of the break rings has obvious pulse characteristics.The series break rings group is more prominent.The deformation of break ring near the side of the whole system is relatively large,and which near the fixed end is small.The pulse characteristics of parallel break rings groups is similar to that of the single.Then a four-line mechanical model of the break ring considering the dynamic characteristics is proposed,which can better reflect the working performance characteristics of break rings.Based on those analysis models,the equivalent relation is developed between the performance indexes of GS-8002 in different test conditions,which is convenient for the design and application in pertinent practical engineering.