Study On Reliability Under Typhoon Action Of High-riee Concrete Frame Removal Structure

There are many countries suffering from wind disaster in the world,and our country is one of the countries most affected by it,not only the eastern coastal area of our country is affected by the wind disaster,even parts of central China are difficult to avoid,may suffer from disasters to varying degrees.Due to the promotion of urbanization and the need of rapid economic development,a considerable number of existing structures are facing demolition.The structural safety guarantee and evaluation of this kind of building structure under the action of typhoon and other wind disasters have a significant impact on the safe operation and maintenance of the city,and there are some differences in the mechanical performance between the demolished building structure and the new complete structure,which urgently needs special research.However,there are few studies on the response of demolished structures under typhoon at home and abroad,which can not provide a reference for the analysis of wind resistance of structures in the demolition period.In order to solve the above problems,this paper uses the reliability theory to study the wind resistance reliability of the structure in the demolition period under the action of typhoon.Firstly,the calculation methods of Poisson-Gumbel extreme wind speed and Gumbel extreme wind speed of extreme type I distribution are compared.The maximum wind speed and basic wind pressure of some cities and regions in China in50 years,20 years,10 years and 5 years are calculated by the two methods respectively.It is found that the calculation method of Poisson-Gumbel joint extreme wind speed is more reasonable for the determination of typhoon action.Then,the response surface method is selected to study the reliability of high-rise concrete frame structure during the demolition period under the action of typhoon.The results show that different extreme wind speed calculation methods have a significant impact on the reliability of the demolition structure.Finally,based on the wind speed data of typhoon calculated by Poisson-Gumbel method and extreme value I-type distribution Gumbel method,the reliability analysis of the structural response of high-rise concrete frame structures with different demolition sequence under typhoon action during demolition period is carried out.It is verified that the Poisson-Gumbel method is more reasonable to calculate the extreme wind speed for the structural response of demolished structures under typhoon action,which provides reference for the future It can provide a reference for the calculation method of the maximum wind speed in the cities easily affected by typhoon and demolition projects.