Research On Vehicle Load Model And Fatigue Load Model Of Jiangsu Province Highway Bridges

Vehicle load and fatigue load are the most important loads of the highway bridge loads.The load of national standard need to plan as a whole,so there may be some differences between the regional actual load and the load of national standard,especially in the eastern coastal developed areas.In addition,with the rapid development of transportation,the load of national standard has a time lag behind regional actual load.More importantly,a large number of existing bridges with all kinds of diseases need to repair and reinforce,and these shall be carried out in accordance with the actual load.Therefore,the research of load model of regional highway bridges is of great significance.Based on the vehicle load data of Jiangsu province,vehicle load,fatigue load and correlation coefficient are studied,the main work is as follows:1.Based on the vehicle load data of more than 54 million vehicles of Jiangsu province,the characteristics of the vehicle load are analysed,including gross,axle load,wheelbase,etc.Then the probability distribution models of the characteristics of the vehicle load are established to support the study of the vehicle load,fatigue load and the correlation coefficient.2.Using the processes and methods which are similar with the the processes and methods of the establishment of national standard,vehicle load model,fatigue load model,fatigue load model of heavy vehicle and the correlation coefficient of Jiangsu province are established and calculated.The main conclusions are as follows:1.The vehicle load applicable to Jiangsu province calculated from the vehicle load data is 1.46 times of the grade I vehicle load of China's current specification "General Specifications for Design of Highway Bridges and Culverts"(JTG D60-2015).2.The fatigue load calculated from the all vehicle load data is 1.1 times of the fatigue load model ? of China's current specification "General Specifications for Design of Highway Bridges and Culverts"(JTG D60-2015)and the fatigue load of heavy vehicle calculated from the vehicle load data more than 49t is 1.43 times of it.3.Transverse reduction factor calculated from the vehicle load data is:1.2 for one lane,1.0 for two lanes,0.85 for three lanes,0.72 for four lanes,0.6 for five lanes,0.47 for six lanes.4.Longitudinal reduction factor calculated from the vehicle load data is:1.0 for 100m,0.826 for 200m,0.6 for 400m,0.48 for 600m,0.394 for 800m,0.326 for 1000m,0.295 for 1250m,0.273 for 1500m.The linear interpolation can be adopted to get the values for other spans.The work of this paper can provide some bases and references for the establishment of the standard of vehicle load and fatigue load of Jiangsu province highway bridges.