Street tree wind-caused damage rapid evaluation method

A street tree, wind-induced technology, applied in the field of engineering, can solve the problems of large differences in individual tree shapes and characters, and difficulties in fine tree modeling, so as to reduce the workload of solving and rapid evaluation.

Inactive Publication Date: 2016-09-21
TONGJI UNIV
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Problems solved by technology

Due to the different types of trees and growth conditions, the individual shapes and traits of trees vary greatly, which brings great difficulties to the fine modeling of trees
Therefore, it is necessary to consider the physi

Method used

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  • Street tree wind-caused damage rapid evaluation method
  • Street tree wind-caused damage rapid evaluation method
  • Street tree wind-caused damage rapid evaluation method

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0032] 1. Simplified model of wind damage to street trees

[0033] Because trees will move along the main wind direction under the action of wind load, the wind damage problem of street trees can be regarded as a plane problem. At the same time, trees are a complex structural system composed of trunks, large branches, and twigs. The individual shapes and traits of trees vary greatly. Therefore, it is difficult to fully adopt the real material parameters of trees, and reasonable simplification must be carried out.

[0034] According to relevant theories, the bending of street trees under the action of wind load can be simplified as figure 1 The mechanical model shown. The whole model is located in the XOY plane, the beam S is the trunk along the X direction and is consolidated with the ground D; B is the branch system, which is composed of two...

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Abstract

A rapid assessment method for wind-induced damage to urban street trees. A simplified model of wind-induced damage to street trees is established. According to the finite element theory and assuming that the tree materials are isotropic and uniform, the material physical parameters that affect the individual dynamic behavior of trees are abstracted; at the same time, considering Due to the different tree species and growth conditions, as well as the large differences in individual tree shapes and traits, the material physical parameters in the wind-induced damage model of street trees are regarded as random variables; the input fluctuating wind speed is taken as the Davenport spectrum, and the virtual excitation method is used for rapid wind-induced response of street trees. calculate. On this basis, a wind-induced damage criterion for street trees based on flexural strength is defined, and Monte Carlo simulation is used to quickly evaluate the damage probability of street trees under different wind load levels. The invention is beneficial to more accurately and effectively predicting wind disaster damage to street trees in urban areas, and has practical significance for formulating corresponding defense measures.

Description

technical field [0001] The invention belongs to the technical field of engineering, and relates to a rapid assessment method for wind-induced damage to street trees in cities. Background technique [0002] Wind disaster is a serious natural disaster. As one of the main disaster-affected bodies, the research on wind damage of trees has attracted more and more attention in recent years. In urban areas, it generally manifests as the breakage or lodging of street trees. The destruction of urban street trees often causes damage to vehicles and houses, interruption of power supply and communication lines, and traffic congestion, which seriously affects the production and life of residents and endangers urban safety. Therefore, it is of great practical significance to study the wind damage characteristics of street trees. [0003] In the world, the research on the wind damage of trees has a history of several decades; in my country, the research on the wind damage of trees start...

Claims

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Application Information

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IPC IPC(8): G06Q10/06
CPCG06Q10/0635
Inventor 彭勇波艾晓秋承颖瑶
Owner TONGJI UNIV
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