Wind Load Characteristics Of Glass Landscape Bridge And Evaluation Of Wind-induced Vibration Comfort

With the rapid development of economy and the improvement of bridge design level,designers are paying more and more attention to the aesthetic characteristics of bridge structure.In recent years,the rapid development of tourism has promoted the construction of landscape bridge in scenic area.This kind of landscape bridges are innovative and unique,at the same time built on the cliff with a great wind speed,the wind effect is obvious,but there were few relevant researches.In this thesis,a glass landscape bridge is used as the engineering background,and the wind-induced vibration comfort and wind load characteristics of the glass landscape bridge are studied by combining the wind tunnel test with the finite element method.The main work and conclusions are as follows:1.The dynamic characteristics of a glass landscape bridge are analyzed,it provides the necessary parameters for the quasi-elastic model wind tunnel test.The calculation results show that the vibration frequency of the bridge is high.2.The wind model and the quasi-elastic model test of the glass landscape bridge are carried out.The wind load characteristics,vortex-induced vibration characteristics and buffeting response of the structure under different wind attack angle and wind direction are obtained.The influence of the site models on the whole force model is obvious,and the five-component coefficient is changed greatly.When the mountain is in the wind direction of the leeward side of the bridge,considering the changes in the flow field and vortex caused by the mountain and the ground of wind tunnel,the lift coefficient in the range of the wind direction is larger than others.No vortex-induced resonance was observed3.The commonly used methods of vibration comfort evaluation,national norms on the vibration comfort were introduced and compared,and based on the wind tunnel test results the vibratio comfort evaluation of the glass landscape bridge was obtained,through the comparison,only the IOS specification takes the influence of different frequencies on vibration comfort into account,and many of the specifications do not consider lateral vibration which human body is more sensitive to.4.Based on the results of the wind tunnel test,combined with the characteristics of the structure itself,the finite element method is used to check the strength of the structural cross section under the wind load,and the cross section stress caused by average wind and the vibration part are compared.The results show that the wind load of the bridge mainly comes from the static effect,the contribution of the dynamic effect is very small.