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Study of Wind Resistence of Large Flexible Structures Based on Human Comfort Condition and Security

Author: LiChao
Tutor: ChenShuiFu
School: Zhejiang University
Course: Structural Engineering
Keywords: Large flexible structures Wind resistance Time history analysis Wind-induced response ANSYS
CLC: TU312.1
Type: Master's thesis
Year: 2010
Downloads: 105
Quote: 0
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Abstract


The ultra- high-rise buildings and large span Stadium extensive use of lightweight, high strength material with light weight , stiffness , damping and low , is a typical large flexible structure is very sensitive to wind loads . Many large flexible structures unique , complex spatial arrangement , the the surface wind load distribution and structure of the wind-induced dynamic response is also more complex , so the wind loads and wind-induced response of such structures dedicated research and exploration is necessary . In this paper, a high-rise building , an estimate of its wind-induced acceleration rms practical analysis method to evaluate its wind-induced comfort conditions . Wind time and modal wind spectrum by the rigid model wind tunnel test surface wind pressure coefficient data structure , re-use curve fitting relationship between the obtained modal wind spectrum and frequency , and finally consider the resonance is established based on random vibration theory simplified relationship between the structure of the response acceleration and vibration frequency . Compare this relationship with the limit of acceleration based on the requirements of comfort , assessment of the structure of wind-induced comfort conditions . Large span roof structures the convex roof structure of a crescent-shaped curved shell , for example , the roof air pressure on local structural change before and after the distribution of CFD ( computational fluid dynamics ) numerical simulation of the structural changes the roof surface wind pressure wind tunnel model tests . Local structural impact loads on the roof surface wind , also numerical simulation results with the results of wind tunnel tests are compared ; At the same time , the study of wind-induced interference effects between the two roof of the construction period selection and construction process should pay attention to the problem is suggested. Based on the ANSYS platform , the dynamic characteristics of the crescent-shaped roof structures and wind-induced dynamic response analysis , the roof of the natural frequencies , modal and modal participation factor through the roof displacement time history analysis wind load factor ; calculation of the partition of the roof structure of the overall wind vibration coefficient , the wind angle of a roof considering wind vibration coefficient of positive and negative air pressure control .

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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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