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Investigation of Spherical-Roof and Curved-Roof Subjected to Thunderstorm Downbursts

Author: CuiBiZuo
Tutor: ChenYong
School: Zhejiang University
Course: Structural Engineering
Keywords: Thunderstorm downburst Spherical shell roof Arched roof Wind pressure distribution Wind tunnel test CFD.
CLC: TU312.1
Type: Master's thesis
Year: 2011
Downloads: 28
Quote: 0
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Abstract


Thunderstorm downburst is a strong downdraft thunderstorms from the center to the periphery proliferation, short time transients strong winds, caused by the extremely near-surface wind speed, resulting in the destruction of a large number of domestic and international structures, and has become the international the hot issues of the research areas of strong wind loads. For a thunderstorm downburst wind field characteristics more comprehensive understanding of, and involved in research on the role of the building is also less, especially for large span roofing systems have not been reported. This paper mainly uses the impact of the wind tunnel test and numerical simulation study thunderstorm downburst under spherical shell roof and arched roof. Wind Field with the design specifications of the atmospheric boundary layer wind impact due to thunderstorms significant difference wind resistant design parameters are not applicable to the impact of wind under the structural design. This paper first consider the general buildings, theoretically establish the impact of wind in line with the previous design habits static wind load calculation formula, given the impact of wind wind high coefficient, and is derived from the the downburst wind tunnel testing or numerical simulation to get building shape coefficient method. Establish the impact of air damper load theory to the shell-type span roof and arched span roof of the specific object of study and produced wind tunnel test model according to the similarity criteria of the fluid, and functional impact of the use of self-designed large-caliber Wind wind tunnel jet device, the characteristics of its steady-state impact of wind under the wind pressure. By changing the shape parameter of the spherical shell roof model, different loss-span ratio, span ratio, span, wind direction and other parameters affected by the impact of wind on the roof surface air pressure distribution law. Related test results were compared with similar test results in the atmospheric boundary layer wind. Also long span roofs have been hit by the impact wind different locations of the three-dimensional wind field wind, and reveals the impact of the impact Wind Field vertical wind speed on the roof wind pressure distribution law. Numerical simulations, the establishment of a full scale impact Numerical Wind Tunnel Wind Field size consistent with the experimental research of large-span roof structure as the research object, by changing the parameters of the structural parameters and the impact of wind impact wind action large span roof numerical simulation of wind pressure, and compared with the experimental results. The results of this study will not only enrich the results of theoretical studies of the impact of existing thunderstorms Wind Field, long-span roof will also the thunderstorm downburst wind provide valuable test data and research experience, and ultimately provide the basis for the formulation of relevant norms .

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CLC: > Industrial Technology > Building Science > Building structure > Structure theory to calculate > Structural loads and structural capacity > Structural load analysis
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