Vibration Of The Steel Box Girder Cable-stayed Bridge Under The Action Of Wind And Rain

With the construction of the rapid development and growing traffic construction of China’s economy, the bridge gradually transferred from inland to coastal development, cross-sea bridge in the process of affected maritime coastal construction, may appear typhoons, rainstorms, tsunamis and other weather disasters, which also led to higher bridge structure against the wind and rain of the impact of anti-requirements, in order to ensure the security of the coastal areas of the bridge and driving comfort, so weather conditions survey and research coastal anti bridge wind and anti-rain effect is necessary. In this paper, by Xiazhang Bridge in different weather conditions of wind and rain vibration coupling response analysis. Around this subject matter, the main contents and arguments are as follows:First, the paper briefly introduces the development of domestic and foreign cable-stayed bridge, and the trend of modern cable-stayed bridge to make summary. It describes the combined effects of wind and rain cable-stayed bridge in the background and significance of research, combined with structural engineering combined effects of wind and rain at home and abroad in the vibration of the status quo, the need to study the combined effects of wind and rain cable-stayed bridge vibration response of discovery.Second,first introduced in the form of wind and rain, and intrinsic parameters of the wind and rain parameters, then the combined effect of wind and rain field simulation analysis, changes in air density and wind driven rain intensity model.Three, through the signal acquisition preprocessing of data errors, data interference removed to obtain reliable data. Then the vibration signal in the time domain analysis, statistical analysis of eigenvalues formula related to the signal, and the same sample functions and function of different samples of the correlation, the correlation function formula obtained.Four, for the calendar year Xiazhang Bridge wind speed and rainfall statistics analysis, heavy rain or rainstorms and typhoons during the rainfall and wind speed, the use of matlab the measured wind speed and rainfall are analyzed and related graphics made by origin, by Graphics comparative analysis of rainfall and maximum wind speed. When a strong wind, they found the degree of coupling rainfall and wind speed of typhoon is relatively low, on the contrary, the degree of coupling is relatively high non-typhoon period.Five, using the vibration signal Xiazhang Bridge Health Monitoring vibration system collected vibration time curve obtained different conditions and weather conditions by matlab, root mean square acceleration curve, and analyzed. In particular, the acceleration under the action of wind and rain RMS curve fitting analysis. It found that after taking into account the wind angle on the vertical acceleration of steel box girder Rain indifference rain effect is not very obvious; but for lateral acceleration, there are circumstances under rain, acceleration amplitude increases almost exponentially.Six. The main conclusions of this paper made a summary of the direction of future research are also put forward their own ideas, and later also made a little study of expectations.