基于力流等效的环形网顶破力学行为解析方法

AN ANALYTICAL METHOD OF PUNCTURE MECHANICAL BEHAVIOR OF RING NETS BASED ON THE LOAD PATH EQUIVALENCE

该文提出了一种基于力流等效的环形网片解析计算方法,用于防护系统环形网拦截单元的顶破力学行为解析。考虑钢丝圈数影响,采用液压作动器控制的球冠形顶头对柔性钢丝网片进行位移加载,开展了8种规格共24张环形网片试件的拟静态顶破试验,明确了环形网片在顶破作用下的力-位移关系。根据试验结果,开展了力流分析,发现环形网片顶破极限状态的承载力主要受若干径向分布的环链影响,据此将力流路径上的环链等效为直线纤维,构建了基于力流等效的网片分析模型。采用Python程序求解获得模型的力与位移解,经与试验结果对比分析,验证了该方法的可靠性,同时,该模型可以揭示网片承载的薄弱区分布特征,并能反映网片顶破极限状态下的径向环链受拉特征。

An analytical method of steel ring net panel was proposed based on the load path equivalence to analyze the quasi-static puncturing mechanical behavior of the interception structure of flexible protective system against rockfall disasters. The quasi-static punching tests of 24 steel wire ring net panels of different numbers of windings were carried out, and the bearing capacity and deformation were obtained. According to the test results, it is found that the deformation and bearing capacity of specimens corresponding to the critical state was mainly affected by the ring chains on some specific force transferring paths. Therefore, an analytical model of the net panel can be established by substituting some straight fibers for the steel rings net in load transferring path based on load path equivalence. The formulas to calculate the maximum out-of-plane force and deflection of ring net panels has been derived. Python tools were used to realize the analytical method. By comparing with test results, the reliability of the proposed model was verified. In addition, this method is able to describe the weak zone of the steel wire ring net panel and reflect the dominant effect of ring chains on the failure of the net panel.