兰州理工大学学报

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (1): 136-143.

• 建筑科学 • 上一篇    下一篇

泥石流冲击作用下CFRP加强型柔性索网体系动力响应分析

王秀丽1,2, 周磊1,2   

  1. 1.兰州理工大学 土木工程学院, 甘肃 兰州 730050;
    2.兰州理工大学 西部土木工程防灾减灾教育部工程研究中心, 甘肃 兰州 730050
  • 收稿日期:2019-12-27 出版日期:2021-02-28 发布日期:2021-03-11
  • 作者简介:王秀丽(1963-),女,辽宁沈阳人,教授,博导.
  • 基金资助:
    国家自然科学基金(51778273)

Dynamic response analysis of CFRP strengthened debris flow flexible cable net system

WANG Xiu-li1,2, ZHOU Lei1,2   

  1. 1. College of Civil Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    2. Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou Univ. of Tech., Lanzhou 730050, China
  • Received:2019-12-27 Online:2021-02-28 Published:2021-03-11

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摘要： 为了使泥石流柔性防护索网体系具有更好的耐久性和抗冲击性,将轻质高强、耐腐蚀性较好的碳纤维复合材料(CFRP)与索网结合,提出一种加强型柔性索网体系.通过九组静力拉伸试验、并运用有限元软件ANSYS/LS-DYNA进行数值模拟,研究CFRP材料对筋材静力性能的影响,研究冲击荷载作用下单索、组合索以及索网在粘贴碳纤维布后的动力响应,探讨碳纤维布对柔性索网抗冲击性能的影响,并与无碳纤维布的情况进行对比分析.结果表明:在拉伸试验中,碳纤维布对于筋材的屈服强度有明显的提升作用,但对拉伸强度的提升不明显;在模拟的冲击过程中,粘贴碳纤维布的钢索整体刚度有一定的提升,同时在各级冲击荷载作用下的位移有所减小;碳纤维布在不发生失效的情况下能分担一部分钢索应力;冲击点附近以及钢索固定端处的碳纤维布容易发生失效破坏,致使钢索应力产生“突变”现象.

关键词: 柔性防护索网, 碳纤维布, 冲击荷载, 动力响应, 抗冲击性能

Abstract: In order to improve the durability and impact resistance of debris flow flexible cable net system, a reinforced flexible cable net system combining lightweight, high strength and corrosion resistant carbon fiber reinforced polymer (CFRP) with cable net is proposed. Through nine groups of static tensile tests and numerical simulation with finite element software ANSYS/LS-DYNA, the influence of CFRP material on the static performance of reinforcements is analyzed. The dynamic responses of single cable, composite cable and cable net pasted with carbon fiber cloth under impact loading are also studied. The effect of carbon fiber cloth on impact resistance of the flexible cable net is discussed and compared with that of flexible cable without pasting carbon fiber cloth. Tested results show that in the tensile test, carbon fiber cloth can obviously improve the yield strength of reinforcement, but the improvement of tensile strength is not obvious. In the simulated impact process, the overall stiffness of the steel cable bonded with carbon fiber cloth may be improved to a certain extent, and the displacement is reduced under all levels of impact loads. Carbon fiber sheet can share part of stress of a steel cable without failure. The carbon fiber sheet near the impact point or at the fixed end of the cable is prone to failure, resulting in a “sudden change” in the stress of the cable.

Key words: flexible protective cable net, carbon fiber cloth, impact load, dynamic response, impact resistance

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