...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Annals of Botany >Tree stability under wind: simulating uprooting with root breakage using a finite element method.
【24h】

Tree stability under wind: simulating uprooting with root breakage using a finite element method.

机译：风中树木的稳定性：使用有限元方法模拟断根的连根拔起。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Background and Aims: Windstorms are the major natural hazard affecting European forests, causing tree damage and timber losses. Modelling tree anchorage mechanisms has progressed with advances in plant architectural modelling, but it is still limited in terms of estimation of anchorage strength. This paper aims to provide a new model for root anchorage, including the successive breakage of roots during uprooting. Methods: The model was based on the finite element method. The breakage of individual roots was taken into account using a failure law derived from previous work carried out on fibre metal laminates. Soil mechanical plasticity was considered using the Mohr-Coulomb failure criterion. The mechanical model for roots was implemented in the numerical code ABAQUS using beam elements embedded in a soil block meshed with 3-D solid elements. The model was tested by simulating tree-pulling experiments previously carried out on a tree of Pinus pinaster (maritime pine). Soil mechanical parameters were obtained from laboratory tests. Root system architecture was digitized and imported into ABAQUS while root material properties were estimated from the literature. Key Results: Numerical simulations of tree-pulling tests exhibited realistic successive root breakages during uprooting, which could be seen in the resulting response curves. Broken roots could be visually located within the root system at any stage of the simulations. The model allowed estimation of anchorage strength in terms of the critical turning moment and accumulated energy, which were in good agreement with in situ measurements. Conclusions: This study provides the first model of tree anchorage strength for P. pinaster derived from the mechanical strength of individual roots. The generic nature of the model permits its further application to other tree species and soil conditions.
机译：背景和目的：暴风雨是影响欧洲森林的主要自然灾害，造成树木破坏和木材损失。树锚固机制的建模随着植物建筑模型的发展而发展，但是在锚固强度的估计方面仍然受到限制。本文旨在提供一种新的根系锚固模型，包括连根拔起过程中根系的连续破坏。方法：该模型基于有限元方法。根源的断裂是根据以前对纤维金属层压板所做的工作得出的破坏定律考虑在内的。使用Mohr-Coulomb破坏准则来考虑土壤机械可塑性。根部的机械模型在数字代码ABAQUS中使用嵌入在与3-D实体单元网格化的土壤块中的梁单元实现。通过模拟先前在Pinus pinaster（海松）树上进行的拉树实验对模型进行了测试。土壤力学参数是从实验室测试中获得的。根系体系结构被数字化并导入到ABAQUS中，而根系材料特性是根据文献进行估算的。关键结果：拔树试验的数值模拟显示了连根拔起过程中逼真的连续断根现象，这可以从所得的响应曲线中看出。在模拟的任何阶段，断根都可以直观地位于根系统内。该模型允许根据临界转弯力矩和累积能量估算锚固强度，这与现场测量结果非常吻合。结论：这项研究提供了第一个从单个根的机械强度得出的P. pinaster树锚固强度模型。该模型的一般性质允许将其进一步应用于其他树种和土壤条件。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号