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柔性防护系统环形拦截网分区等代模型

赵雅娜 余志祥 赵世春

赵雅娜, 余志祥, 赵世春. 柔性防护系统环形拦截网分区等代模型[J]. 西南交通大学学报, 2019, 54(4): 808-815. doi: 10.3969/j.issn.0258-2724.20170949
引用本文: 赵雅娜, 余志祥, 赵世春. 柔性防护系统环形拦截网分区等代模型[J]. 西南交通大学学报, 2019, 54(4): 808-815. doi: 10.3969/j.issn.0258-2724.20170949
ZHAO Yana, YU Zhixiang, ZHAO Shichun. Ring-Net Subdivision Equivalent Model of Flexible Protection System[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 808-815. doi: 10.3969/j.issn.0258-2724.20170949
Citation: ZHAO Yana, YU Zhixiang, ZHAO Shichun. Ring-Net Subdivision Equivalent Model of Flexible Protection System[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 808-815. doi: 10.3969/j.issn.0258-2724.20170949

柔性防护系统环形拦截网分区等代模型

doi: 10.3969/j.issn.0258-2724.20170949
基金项目: 国家重点研发计划(2018YFC1505405);国家自然科学基金资助项目(51678504);四川省应用基础研究资助项目(2018JY0029);中国铁路总公司科技研究开发计划(N2018G031)
详细信息
    作者简介:

    赵雅娜(1981—),女,博士研究生,研究方向为结构工程,E-mail:analy_ana@126.com

    通讯作者:

    余志祥(1976—),男,副教授,博士,研究方向为结构工程,E-mail:yzxzrq@home.swjtu.edu.cn

  • 中图分类号: U417.1

Ring-Net Subdivision Equivalent Model of Flexible Protection System

  • 摘要: 环形网是被动柔性防护系统中的重要结构单元,其冲击变形具有明显的多柔体非线性动力学特征,其计算模型的构建是柔性防护结构理论研究的难点与关键点. 为了建立环形网的计算模型,首先通过柔性被动网整体结构足尺冲击试验,获取了环形拦截网的区域化变形特征以及网环的典型变形状态;其次通过网环拉伸试验与数值仿真计算的方式得到了各典型变形状态下,网环的荷载位移关系,建立了分区等代计算模型;最后通过与网片顶破试验、动力冲击试验展开对比计算的方式校验了模型的准确性. 研究结果表明:环形拦截网具有明显的分区域变形特征,网环(环形网的基本单元)具有3种典型变形状态,各变形状态的网环均具有两阶段受力特征;据此采用连接于圆心、初始长度为网环半径的“X”形4桁架单元模拟单个网环,将典型变形状态下网环的荷载位移关系等效为桁架单元应力应变关系,连接对应节点形成整片网的单元模型,根据网环所处的变形区域赋予桁架单元相应的应力应变关系,建立了整片环形网的高效率分区域等代模型;通过与静力试验及动力试验的对比,模型计算误差小于10%.

     

  • 图 1  柔性防护系统中的环形网

    Figure 1.  Ring-net in flexible protection system

    图 2  3 000 kJ足尺冲击试验模型

    Figure 2.  3 000 kJ full scale impact test model

    图 3  冲击跨环形网变形过程

    Figure 3.  Deformation process of ring-net in impact zone

    图 4  网环的滑移变形

    Figure 4.  Slip and deformation of the rings

    图 5  网环试验

    Figure 5.  Quasi-static tensile test of net rings

    图 6  等代模型

    Figure 6.  Equivalent element model

    图 7  试验结果分析

    Figure 7.  Analysis of test results

    图 8  两段式恢复力模型

    Figure 8.  Two-stage restoring force model

    图 9  结果对比

    Figure 9.  Comparison of acceleration results

    表  1  构件型号

    Table  1.   Component specifications

    构件规格减压环支撑钢柱上拉锚绳/mm上支撑绳/mm下支撑绳/mm
    能量/kJ个数/个工作拉力/ t
    环形网R16/3/30050484.5HW250 mm × 250 mm × 9 mm × 14 mm3ϕ18 × 84ϕ224ϕ22
    下载: 导出CSV

    表  2  试件规格

    Table  2.   Specimen specifications

    试验试件规格
    对径拉伸R5/3/300R7/3/300R9/3/300
    滑移对角拉伸R5/3/302R7/3/302R9/3/302
    下载: 导出CSV

    表  3  破断力及变形量结果

    Table  3.   Fracture forces and deformation results

    试件规格对径试验滑移对角试验对角计算
    δ/mmP/kNδ/mmP/kNδ/mmP/kN
    R5/3/30015154226561749
    R7/3/30015584240851765
    R9/3/30015596245931686
    下载: 导出CSV

    表  4  结果对比

    Table  4.   Results comparison

    试件规格顶破力/kN顶破变形/mm
    试验计算试验计算
    R5/3/3002112051 0821 083
    R7/3/3003153091 0071 008
    R9/3/3004694591 0071 008
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-12-30
  • 修回日期:  2018-04-27
  • 网络出版日期:  2019-02-23
  • 刊出日期:  2019-08-01

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