The Wind Response Analysis Of The Long-Span Continuous Rigid Frame Bridge With High Pier

With a convenient ways to construct and a excellent mechanical properties of roads and bridges, the long-span PC continuous rigid frame bridge with high piers are increasingly being applied to highway projects which across the river and valley. Due to special air environment of the place where continuous rigid frame bridge usually being constructed and structure of the bridge site is usually high pier, lightweight, flexible, the stability of wind load on bridge has become an important indicator of the beginning of such bridge design. In this paper,based on the theory of highway bridge design method and the buffeting analysis method, using the method of finite element and with the help of FLUENT, MATLAB, Midas Civil and ANSYS software, as a long-span continuous rigid frame bridge with a high pier-Mangjiedu large bridge in Fengqing County of Yunnan province for the research object, study of the high pier Long-span Continuous Rigid Frame Bridge in the wind response. Mainly studied the Mangjiedu bridge multiple variable cross-section of three component coefficients of Mangjiedu large bridge, transverse wind load, the stability of Mangjiedu large bridge dynamic wind response.The concrete research content of the thesis:(1) According the location terrain conditions of the Mangjiedu bridge and in accordance with the "standard about highway bridge design of wind resistance" to calculate the reference wind speed, the main beam and the main bridge pier at the bridge site design basis wind speed.(2) Using the finite element software ANSYS/FLUENT calculated Mangjiedu main bridge section of the main beam becomes third force coefficient, obtained by fitting a third of the force coefficient variation with high beam functions and one-third of the wind power factor angle of attack changes functions.(3) Based on harmonic superposition method using MATLAB software to simulate the fluctuating wind speed obtained when the main bridge47 critical points of the process.(4) Use array method to calculate the static wind load Mangjiedu cantilever bridge in the construction phase and into the biggest stage of the cross-bridge to bridge static gust load response, and analyze the transverse direction wind load stability.(5) Using the buffeting analysis method, with the help of a finite element software ANSYS12.0, established the Mangjiedu large bridge in cantilever construction stage and finished stage, the dynamic calculation model of static wind load, the design language of APDL parameters of Mangjiedu large bridge, the dynamic wind response calculation.(6) Studies on the wind-induced Mangjiedu use the bridge buffeting response time history analysis.The research results show that:Firstly, the main factors affecting of the3component is the height of beam and wind attack angle.Secondly, The safety coefficient of Mangjiedu large bridge in wind load is6more than4,of Mangjiedu large bridge is safe in the transverse direction of the bridge wind loads.Thirdly, time domain buffeting analysis shows the buffeting force response than the static response increases the coefficient of about1.1, and the power of the maximum cantilever construction stage increases the coefficient ratio of bridge, dynamic sensitivity maximum cantilever construction stage is greater than that of bridge.Fourthly, the total wind-induced response of Mangjiedu Bridge, time domain analysis of relatively standardized coefficient method in response to a large gust of15%to30%, and therefore the need for Mangjiedu Bridge buffeting analysis in time domain in order to be more precise wind-resistant design.Finally, the paper summarizes the content of this study and the creative points, and Forecasts the prospect of research directions.