Analysis Wind Characteristics In The Jiaozhou Bay Area Based On Long Term Monitoring

The loss caused by the typhoon is the maximum of all the natural disasters.According to previous data,the global average annual generationa of typhoon is about 80?100 times,of which about 1/10 landed in the southeast coast of China,caused massive natural disasters in our country.The typhoon caused serious damage to people's lives and property,in which the destruction of the building structure is an important aspect.Along with the develop of bridge in the direction of large span and flexible.the bridge structure ismore sensitive to the wind load,so the wind load often becomes the control load in the structure design of big span flexible bridge.Wind load often cause the loss of the durability of the bridge structure,the damage of local components and even the overall collapse.Wind load has remarkable regional characteristic,based on the large number of monitoring data collected by the Jiaozhou Bay Bridge Health Monitoring System,this title will analyze wind field characteristics in the region,the main contents are as follows:(1)Based on wind data of multipoint monitoring for the whole year,the general characteristics of Jiaozhou Bay wind field are studied,the distribution of annual average wind speed and direction are analyzed;Based on the monitoring data of three typhoons,the typhoon average characteristics and wind distribution characteristics of wind speed and direction are analyzed,as well as the differences of wind speed and wind direction at different locations and different heights;(2)Based on the multi point monitoring data of three typhoons,the fluctuating wind characteristics of typhoon in the Jiaozhou Bay area are studied.Respectively analyzes the turbulence intensity of Typhoon in the downwind and crosswind directions,gust factor,integral scale,and the properties of fluctuating wind and the average wind speed;Discusses the relationship between the gust factor and turbulence intensity;Analyzes the fluctuating wind power spectrum,a variety of experience spectrumare used to fitting analysis;Contrastive analyze the pulsation of the three typhoons and Hong Kong"York" typhoon.(3)Render the Von Karman spectrum as the target power spectrum,harmonic superposition method is used to simulate the fluctuating wind velocity;Againstthe cable stayed bridge,make wind speed into wind load,calculateand analyze wind-induced displacement and strain response of the cable-stayed bridge.