Buffeting Analysis And Wind-induced Internal Force Analysis For Mutil-tower Cable-stayed Bridge

Nowdays,with the cable-stayed bridge developing into an long-span and flexible phase,the problem of wind-induced vibration has become increasingly prominent.The problem of buffeting is inevitable at the building and using stage,which is not only related to safety at the buiding stage,but also affects the degree of driving comfort at the using stage.So the problem of anti-wind of the bridge is increasingly important.The buffeting can be analyzed both in frequency domain and time domain.The frequency domain analysis can take into account the characteristics of atmospheric turbulence, and the calculation is simple,so this method have been widely used.The research of this paper is related to JiaShao Bridge which is a long-span Cable-stayed Bridge. In this paper,anti-wind capability especially the buffeting response of the bridge is studied.The main Works are the following:1. the basic analysis theories of buffeting of bridge are all presented briefly.2. The structural dynamiec charaeteristics of the bridge are analyzed.The finite element model of the structure and dynamic characteristics are presented briefly.3. The characteristics of wind environment in the bridge site are studied primarily.The fundamental wind speed in bridge site is identified. The static wind response of the bridge is analyzed.4. The buffeting response of the bridge is analyzed.The analysis methods of response of deformation and inner forces are briefly discussed. And the parameters for analyzing are given.5. The effects of the buffeting response on aerodynamic admittance function are analyzed,and some regulal conclusions are summarized.Through this study,the wind resistant charaeteristics of cable-stayed bridge are recognized more clearly,and the computing theories and methods of bridge response of static wind and buffeting are understood.This research should have instruction meaning for the future similar bridges'design.