风荷载作用下树木力学特性研究进展

Research Progress of Mechanical Properties of Trees under Wind Load Action

风对树木的破坏是树木受破坏的主要形式之一,因此有必要对树木在风荷载作用下的力学性能进行研究。首先简述风对树木的危害,分析树木发生风害的影响因素,主要有气候条件、树的品种、树龄、树的根系、树冠、树高、树叶及树所处的地势、土质等;回顾当前树木风荷载作用下应力分析和风振机理的研究现状,并概述目前风荷载下主要的树木力学模型的研究概况。在此基础上,指出目前树木风振分析在实验方法、弹性模量及根部锚固性能对风振影响方面存在的问题,以及树木力学模型建立时在树木本身、根部锚固、风场及变形和阻尼方面的理想化假设存在的问题,进而提出需要进一步研究的问题及今后的研究趋势,为后续研究积累经验。

Wind damage is one of the main causes of tree destruction,therefore it＇s necessary to study the mechanical property of trees under wind load action. Firstly,the wind damage of trees was expounded,and the influence factors of wind damage were analyzed,including climatic conditions,varieties of tree species,tree age,roots,crown,tree height,leaves,terrain and topography.Then,the research status of stress analysis and wind vibration of trees under wind load action was reviewed,and the research situation of trees mechanical models was presented. On the basis of this,the existed issues in the present study of wind vibration from experimental methods,elastic modulus,and roothold impacts were pointed out,the hypothesis issue of trees mechanical models building on the tree itself,roothold,wind field,deformation and damping were also summarized,and then further research problems was put forward,which has accumulated experiences for the further research.