|Table of Contents|

Working state analysis of long-span grid structure considering wind-induced uneven snow cover(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年03期
Page:
102-110
Research Field:
建筑结构
Publishing date:

Info

Title:
Working state analysis of long-span grid structure considering wind-induced uneven snow cover
Author(s):
LIU Hui1; 2;  HUANG Changhao1;  JI Baifeng1; 2
(1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China; 2. Hubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China)
Keywords:
uneven snow cover;  working state analysis;  CFD quasi dynamic simulation;  long-span grid structure
PACS:
TU312.3
DOI:
10.19815/j.jace.2021.11010
Abstract:
In order to ensure the service safety of structure, it is necessary to analyze the working state of grid structure under uneven snow cover load. Taking a square pyramid grid structure as the research background, the CFD numerical simulation technology and quasi dynamic grid division method were adopted to investigate the changes of uneven snow cover distribution on the roof of grid structure during continuous snowfall for 24 h. The effects of wind angles and wind speeds on the changes of snow distribution on the roof of grid were discussed in detail. Finally, the finite element model of the grid structure was established. The working states of the structure under different snow load conditions were analyzed. The results show that compared with other working conditions under windy conditions, the average snow pressure and proportion of deposition area are the largest when the wind speed is 12 m?s-1 and the wind angle is 90°, therefore it is the most unfavorable working condition of the structure. The average snow pressure under this working condition is 88.9% of the average snow pressure of uniformly distributed snow under no wind condition. The maximum stress and deflection of structural members are increased compared with those under the action of uniformly distributed snow, and some members change from tension rod to compression rod. Wind-induced uneven snow cover is a potential safety hazard of grid structure during service, which should be paid attention to in engineering design.

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Last Update: 2023-05-20