Simulation of wind load on street trees based on laser scanning and crown morphological equivalence
Accurate simulation of wind loads on street trees is a prerequisite for analyzing wind-induced failure modes and implementing reinforcement treatments. In order to precisely simulate the wind loads on street trees, we propose a numerical simulation method for wind loads on typical street trees based...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Science Press (China Science Publishing & Media Ltd.)
2024-03-01
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| Series: | Shenzhen Daxue xuebao. Ligong ban |
| Subjects: | |
| Online Access: | https://journal.szu.edu.cn/en/#/digest?ArticleID=2599 |
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| Summary: | Accurate simulation of wind loads on street trees is a prerequisite for analyzing wind-induced failure modes and implementing reinforcement treatments. In order to precisely simulate the wind loads on street trees, we propose a numerical simulation method for wind loads on typical street trees based on the equivalent fusion of 3D laser scanning and tree crown morphology, and discuss the wind-induced failure modes of typical street trees. Firstly, the point cloud models of the Camellia and Jacaranda street trees are established through mobile 3D laser scanning, and the numerical analysis model of the street trees is constructed by applying the morphological equivalence principle for the crown part. Next, the reduction pattern of model size with different wind speeds in equivalent modeling method is explored. Finally, the wind vibration response characteristics and failure modes of the street tree model under different wind speeds are discussed. The results indicate that the wind load simulation method of street trees based on the 3D laser scanning and crown morphology equivalence can accurately simulate the wind load characteristics of street trees, with an error between the simulated and experimental values of downwind resistance of street trees less than 5%. The predominant damage pattern of trees is mainly bending deformation, and the initial damage of branches at all levels of trees presents the sequence characteristics of tertiary branch, secondary branch, primary branch and trunk. However, when the wind speed is high, the damage of trunk or important branches precedes that of secondary branches. The proposed method for simulating wind loads on street trees with equivalent crown morphology is accurate and has important guiding significance for analysis of wind-induced vulnerability of urban street trees and disaster prevention and mitigation planning of urban greenery systems. |
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| ISSN: | 1000-2618 |