Abstract
Wind load on building surface is one of the main loads for structural design; scholars in this field have put forward some methods to calculate wind load, such as Simiu method and Kasperski method. Based on the basic theory of probability and the systematic analysis of the surrounding environment and turbulence, a random variable model for calculating wind load is established. According to the model, through the analysis of the relationship between guarantee rate and wind load, a numerical calculation method to calculate wind load is proposed based on extreme value analysis and polynomial fitting theory. To verify the performance of the algorithm, wind tunnel experiments were carried out to obtain a large number of first-hand measured data of high-rise building (Shanghai World Financial Center). Based on the measured data, the algorithm is simulated, and calculated results are analyzed, including wind pressure distribution on building and probability distribution of fluctuating wind pressure of some measuring points. The validity and accuracy of the proposed model and algorithm are verified by the comparative analysis and theoretical analysis of the calculation results.
Highlights
Wind load on building surface is one of the main loads for structural design; scholars in this field have put forward some methods to calculate wind load, such as Simiu method and Kasperski method
The peak factor method is used to obtain the most unfavorable wind pressure coefficient extreme value under the whole wind direction, and the wind pressure coefficient time history of the actual measuring point is obtained through wind tunnel test, and the wind load estimation value is obtained according to Bernoulli expression. e existing calculation method requires a large amount of data and calculation, a complex calculation process, but inaccurate results are obtained. erefore, it is not suitable for engineering applications
A numerical method is proposed. e algorithm is verified by the wind tunnel test data, and the following conclusions are obtained: (1) It is not safe to use peak factor method to calculate extreme wind load of enclosure components in these areas. e investigation of wind disaster shows that it is the local damage caused by the separation of air flow and vortex shedding that leads to the larger damage of the envelope
Summary
Wind load on building surface is one of the main loads for structural design; scholars in this field have put forward some methods to calculate wind load, such as Simiu method and Kasperski method. Targeting the wind-resistant design of high-rise buildings, in recent research studies, many wind load calculation and wind pressure extremum estimation methods are proposed. Diniz et al method [23] is based on Monte Carlo simulation and introduces a series of factors of cognitive uncertainty to study the wind load estimation method considering wind direction more comprehensively and accurately In their methods, the peak factor method is used to obtain the most unfavorable wind pressure coefficient extreme value under the whole wind direction, and the wind pressure coefficient time history of the actual measuring point is obtained through wind tunnel test, and the wind load estimation value is obtained according to Bernoulli expression. Based on the basic probability theory and combined with the systematic analysis of the surrounding environment and turbulence of buildings, a random variable model is established to calculate the wind load considering wind direction. Taking the wind pressures on claddings of the Shanghai World Financial Center as an example, the accuracy and effectiveness of the proposed algorithm are systematically verified
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