| Vehicle load is a kind of relatively low intensity with a long cycle,effect time interval and peak load are uneven random load.Vehicle load effect on the bridge transition section for a long time,soil will generate settlement because of the accumulation of the plastic deformation,the abutment will produce deformation and the abutment pile appears larger settlement because of the settlement of soil and bearing the load from the upper even it is destroyed seriously,so the bearing capacity of the abutment pile foundation will be reduced greatly and the normal traffic operation of roads and bridges will be affected.For this problem,the author uses the method of combining the soil dynamis test,collectioning the random vehicle load in the site and finite element simulation analysis.This paper makes a study of this kind of influence of the abutment pile soil system under random traffic load in Fuxin.The main work is as fallows:(1)Making a dynamic triaxial test with the soil taken from the abutment pile froundation of the bridge in Fuxin and getting the important paramenters of the dynamic action of soil.(2) The actual bridge as an object,observating and collecting the deflection response curve of bridge abutment when vehicles going through the bridge in traffic rush hours,transformed it into acceleration signal with the help of Matlab software,though simplifying and analysising the model of abutment pile soil system,work out the random loads when the moving vehicles travelling on the bridge.(3)With the help of finite element software Midas/GTS,analysed the settlement of single pile-soil system and the side friction of pile under the random vehicle loads and summarized the influence of different influence factors on the pile soil system.(4)In the project background of No.7 bridge in Fuxin,analysed the settlement of the abutment group of pile-soil system and worked out the different quantity,distance and length-diameter ratio of pile under the random vehicle loads. |
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