Wind tunnel test of wind-induced snowdrift on stepped flat roofs during snowfall
- PDF / 2,594,851 Bytes
- 22 Pages / 439.37 x 666.142 pts Page_size
- 86 Downloads / 142 Views
Wind tunnel test of wind‑induced snowdrift on stepped flat roofs during snowfall Jianshuo Wang1,2,5 · Hongbo Liu1,2 · Zhihua Chen1,2,4 · Kejian Ma2,3 Received: 10 September 2018 / Accepted: 16 July 2020 © Springer Nature B.V. 2020
Abstract Snow distribution on a building surface is uneven due to the complicated drift movements of snow grains affected by the wind. Therefore, an accurate estimation of the snow distribution on a building’s roof is essential in protecting its structure. The existing wind tunnel tests of snow distribution on roofs do not consider the influences of falling snow, resulting in deviations between the test results and the actual snow distribution. In this study, a wind tunnel test method considering the snow falling process was proposed to simulate the irregular snow distribution on stepped flat roofs during snowfall. Based on the test data, the variation rule of snow distribution on the stepped flat roof with different test methods and conditions is summarized. (1) The results of the conventional snow erosion test, which neglected the influences of falling snow, deviated from the existing measurement results. (2) The test results of the proposed method with varying wind speeds and grain sizes met the double-linear or triple-linear rule, which conformed to the measurement results. (3) The initial snow significantly influenced the snow distribution on the front of the lower roof on windward side but only slightly affected the snow distribution on the other locations. The research conclusions could provide significant contributions to the actual engineering design. Keywords Snowdrift · Stepped flat roofs · Wind tunnel test · Snowfall · Snow distribution
* Hongbo Liu [email protected] 1
State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, China
2
Department of Civil Engineering, Tianjin University, Tianjin, China
3
The Spatial Research Center, Guizhou University, Guiyang, China
4
Key Laboratory of Coast Civil Structure and Safety, Ministry of Education (Tianjin University), Tianjin, China
5
Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University, Tianjin, China
13
Vol.:(0123456789)
Natural Hazards
1 Introduction Climate change, because of global warming, causes frequent occurrence of disastrous weather conditions, such as strong winds, snowstorm, extremely low temperature, extremely high temperature, rainstorm, and heavy hail with 50- and 100-year return periods. Snow load cannot be ignored in large-span space structure designs. Excessive snow load may cause the collapse of large-span structures. In February 2004, the Transvaal Water Park roof in Moscow collapsed under the collaborative effect of snow loads and great temperature difference, resulting in 28 deaths. In 2005, the Bad Reichenhall Skating Hall in Germany collapsed in a snowstorm, which caused 15 deaths. In January 2006, the roof of Katowice Exhibition Hall in Poland collapsed due to local heavy snow loads, resulting in 63 d
Data Loading...
