多跨布置式环网柔性被动网结构数值计算方法  

Numerical computing method for a flexible passive network structure with multi-span distributed ring-net

作　　者：赵雅娜[1] 余志祥[1] 赵世春[1] ZHAO Yana;YU Zhixiang;ZHAO Shichun(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木学院

出　　处：《振动与冲击》2019年第17期211-219,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51678504);四川省重点科技计划项目(18YYJC)

摘　　要：提出了一种基于环形网分块变形特征的环网计算模型以及组合耗能单元计算模型的设计和验证多跨布置式环网柔性被动网结构的数值方法。首先开展了“松柔支撑”环形网动力冲击试验以和1 500 kJ多跨布置式柔性被动网结构的全尺寸动力冲击试验,采集了部件及结构动力响应结果作为数值计算方法的校准标准;然后,构建了以组合耗能单元计算模型和分区域环形网计算模型为主的数值建模方法,并通过试验数据确定了关键参数的取值方法;最后开展了“松柔支撑”环形网冲击试验和1 500 kJ全尺寸冲击试验数值模拟,从整体结构变形过程、最大变形量和主要构件动力响应等方面逐步验证了数值方法的可靠性。结果表明,利用基本构件数值模型所建立的结构计算模型,能较好的反映结构冲击动力响应过程,可以作为结构设计和校验的有效手段。Here,a numerical approach was proposed for design and verification of a flexible passive network structure with multi-span distributed ring-net based on the ring-net computing model with partitioned deformation feature and the combined energy-dissipating element computing model.Firstly,dynamic impact tests for two groups ring-net with“loose boundary”and 1 500 kJ full-scale impact tests on a flexible passive network structure with multi-span were conducted.The dynamic response results of components and structures were collected as the calibration standards of the numerical computing method.Then,the numerical modeling method was constructed based on the ring-net computing model with partitioned deformation and the combined energy-dissipating element computing model.The method of taking value for key parameters was determined with test data.Finally,numerical simulations were performed for the two dynamic impact tests mentioned above.The reliability of the proposed numerical method was verified using the overall structure deformation process,the maximum deformation value and main components’dynamic responses.The results showed that the structure’s computing model built with basic components’numerical models can better reflect the structure’s impact dynamic response process,and can be taken as effective means of structural design and verification.

关 键 词：柔性防护系统 环形网 数值计算 

分 类 号：U417.1[交通运输工程—道路与铁道工程]