摘要
通过对单个R0CCO圆环的静力试验和理论分析,推导了圆环等效半径的计算方法。建立了两种组合形式环形网的计算模型:第一种组合形式(模型1)中1个R0CCO圆环与4个R0CCO圆环相连接;第二种组合形式(模型2)中1个R0CCO圆环与6个R0CCO圆环相连接,采用数值分析方法对模型1、2的静动力耗能特性进行了研究。结果表明:①采用相同的ROCCO圆环组成模型1、2时,模型2中单个ROCCO圆环的耗能能力高于模型1;②当采用相等的材料组成模型1、2时,在相同动能的落石冲击作用下,模型2的变形距离低于模型1,且模型1受到的落石冲击荷载开始时低于模型2,随着落石直径的增大,逐渐高于模型2;③模型1、模型2在落石冲击作用下的极限耗能能力随着落石直径的增大而逐渐增大,且模型1的极限耗能能力开始时高于模型2,当落石直径达到一定程度后,模型2的耗能能力逐渐高于模型1。因此,当实际工程中需要考虑防护系统变形距离时,选择第二种组合形式的环形网,可以节约工程造价,而当需要考虑系统极限耗能能力时,可以根据落石特征选择经济的合理的环形网结构形式。
Calculation method for equivalent radius of rings was deduced through static tests and theoretucal analysis of a single ROCCO ring.Calculation models with two different connection forms of a ring net were put forward.Four ROCCO rings were connected to a single ROCCO ring in the first connection form（Model 1） and six ROCCO rings were connected to a single ROCCO ring in the second connection form（Model 2）.Static and dynamic energy dissipation capacity of the two models were studied with numerical analysis method.The results indicated that ①the energy dissipation capacity of the single ROCCO ring in model 2 is greater than that in model 1 when ROCCO rings are the same in both models;②the deformation displacement in model 2 is shorter than that in model 1 under rockfall strike with the same kinetic energy when the two models are made of the same material;the rockfall impacting load in model 2 is lower than that in model 1 at first,and it grows greater than that in model 1 with radius of rockfall growing;③ energy dissipation capacity limitation under rockfall impacting grows with radius of rockfall growing;the energy dissipation capacity limitation in model 1 is greater than that in model 2,and the dissipation capacity limitation in model 2 grows greater than that in model 1 when radius of rockfall grows to some level.So the second model could be adopted to reduce the costs when the deformation displacement of a protective system was taken into consideration and an economical and reasonable connection form could be chosen based on the characteristic of the rockfall when the energy dissipation capacity limitation of the system was taken into consideration.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第2期55-61,共7页
Journal of Vibration and Shock
基金
总后基建营房部资助项目
关键词
组合形式
环形网
耗能
静力
动力
数值分析
connection form
ring net
energy dissipation
static tests
dynamic tests
FEM
