基于离散元的EMAS泡沫混凝土贯入力学性能研究
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1.同济大学交通运输工程学院道路与机场工程系;2.中建丝路建设投资有限公司;3.中国公路学会

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TU528.2

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Penetration Mechanical Properties of EMAS Foam Concrete Based on Discrete Element Simulation
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1.Tongji University college of transportation engineering;2.China State Construction Silkroad Construction Investment Group Co., Ltd;3.CHINA HIGHWAY AND TRANSPORTATION SOCIETY

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    摘要:

    美国联邦航空管理局推荐在跑道端以外设置泡沫混凝土制成的特性材料拦阻系统(EMAS)。以拦阻冲出跑道的飞机。EMAS拦阻效果的研究最可靠的是采用现场真机试验,但其实施困难,而现有的有限元仿真方法难以模拟材料被碾压破碎的过程。为此,本文首先通过贯入力学试验研究泡沫混凝土破碎碾压过程的力学性能,并分析了冻融作用对其压溃强度及吸能效果的影响。在初步建立泡沫混凝土离散元模型的基础上,提出“虚拟试验法”,以获得泡沫混凝土离散元模型的最佳参数组合。通过模拟抗压强度证明了仿真精度可达97.7%。在此模型的基础上,研究了混凝土颗粒及孔隙的粒径和力学参数对材料贯入力学性能的影响。本文提出的EMAS泡沫混凝土材料离散元模型可为EMAS拦阻过程仿真提供更为精确的研究方法。

    Abstract:

    To arrest aircrafts, the Federal Aviation Administration recommends constructing an Engineered Materials Arresting System (EMAS) at the end of a runway. The system is made of foam concrete. To investigate its arresting effect, aircraft field test is the most reliable method, but it is difficult to conduct. Current simulations usually adopt finite element method, but it cannot simulate the crushing process of foam concrete. This research conducted penetration tests to study its mechanical properties in crushing process. The effects of freeze-thaw on compressive strength and energy absorption of the material were analyzed. A discrete element model of foam concrete was established, and the virtual test method is proposed to calibrate parameters of the model. The simulation result of compressive strength proves that the accuracy of the model can reach 97.7%. With this model, the influences of particle size and mechanical parameters on penetration mechanical properties of foam concrete was studied. The discrete element model of EMAS foam concrete proposed in this research provides a more accurate research method for EMAS arresting simulation.

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历史
  • 收稿日期:2021-12-30
  • 最后修改日期:2022-04-09
  • 录用日期:2022-04-10
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