Field Measurement Of Wind Characteristics Of Multiple Typhoons Used In Coastal Bridge Design

In recent years,infrastructure construction has been a hot topic in China’s economic development.As the most core part of the infrastructure construction of municipal public works facilities,the traffic has been unprecedented development.As an indispensable part of traffic construction,bridge performance is often easily affected by various external factors.Among them,long-span Bridges in coastal areas are especially affected by strong winds.The southeast coast is located in the subtropical region and adjacent to the west coast of the Pacific Ocean.It is often hit by multiple typhoons from the western Pacific Ocean in July and August every year.Cities along the southeast coast are affected by typhoons of different intensity all the year round,which have a huge impact on the safety and applicability of bridge structures in the whole stage of construction and operation and use.Therefore,wind-resistant design of Bridges in coastal areas is particularly important,which requires a large number of bridge sites or near bridge sites to be measured typhoon wind field characteristics as the basic reserve for wind-resistant design.The data measured in the field can reflect the real situation of the typhoon at all stages,so it has become a common research method compared with wind tunnel test and numerical simulation.Based on the anemometer installed at a 30 m height on the roof of a 5-story frame structure near the bridge site of Nankou Bridge in Wenzhou,this paper collects real-time typhoon data when "Phoenix","Seagulls","Rose" and "Morakot" pass through Wenzhou,and conducts wind characteristic parameters research and comparative analysis for each typhoon.The main contents of this paper are as follows:(1)The formation,development and movement of typhoons are briefly introduced,as well as the observation point location,geographical environment and specific parameters and layout details of the anemometer based on the measured typhoon data;The basic concept,analysis method and calculation formula of the research parameters of typhoon wind field characteristics are described.(2)Analyze the characteristic parameters of typhoon wind field based on the real-time data collected by anemometer.For each typhoon interval selection basis,specific analysis of the average wind speed and direction,the probability density distribution,turbulence intensity,peak factor,gust factor,turbulence integral scale,power spectral density,relevance and coherence,on the part of the wind field characteristic parameters fitting,compared with the existing research results,and analyzes the change trend,etc.(3)Based on the calculation of the typhoon wind field characteristic parameters,further to the average wind speed and wind direction,the probability density distribution,turbulence,peak factor,gust factor,turbulence integral scale,power spectral density,relevance and coherence wind characteristic parameters were analyzed,and analyze the four typhoon transit Nankou Bridge in wenzhou near the bridge site when the similarities and differences among the various parameters,through multiple typhoon data summary of typhoon wind field characteristics of wenzhou region,coastal wenzhou bridge structure provides effective reference to the research on wind resistance.