Random Vehicle Load Analogue Simulation Based On The Measured Data And Bridge Dynamic Analysis

With the rapid development of the transportation industry,the bridge in our country has greatly improved both in quantity and grade.However,with the development of the transportation industry and the rapid growth of the number of cars,the road congestion and overload is becoming more and more serious.The number of dangerous bridge and sub-health bridge still at a high level,serious threat to the normal use of the bridge function and make the bridge produced a certain security hidden danger.Vehicle load has become one of the important factors that affect the normal use,service life and safety of the bridge.Therefore,in order to understand the vehicle load operating condition of highway bridges in China,this thesis by the national natural fund “The model studying of highway bridge operation vehicle load(51278134)”,and the science and technology project of jiangxi province transportation hall “Mixed traffic flow theory and its applied research in sub-health bridge bearing capacity evaluation(2014Y0012)” as the backing.And combined with the relevant departments to provide the vehicle survey data,the vehicle load carried out the relevant research work.The main contents of the study are as follows:(1)Using the CA model and the vehicle data to carry out the numerical simulation of the load of the bridge.On the basis of statistical analysis of the data of two regions,the vehicle load of the highway bridge under different regions and different traffic flow is simulated.And a comparative analysis of the vehicle load in the two regions is carried out by using the simulation results.(2)The distribution law and the standard values of the load effects of simply supported beams and continuous beams under random vehicle loads are studied.Using of MATLAB software compiled calculation program to calculate the load effect for simply supported beam and continuous beam under the random traffic load,and adopt the method of influence line load calculation with simulation of two areas vehicle load.The calculation results were analyzed statistically.And then use statistical analysis results in two regions to calculate the load effect standard values of simply supported and continuous beams.(3)Studing the vibration responses of simply supported beams and continuous beams under vehicle loads in two regions.The ANSYS software is used to establish the model of bridge structure under moving vehicle load.Studing the dynamic response characteristics of the simple supported and continuous beam and the influence of the random vehicle load on the dynamic response of the bridge by using the time history analysis method.