Stady On Mechanical Behavior Of Ribbed Girder Bridge Lane Plate Reinforced By PUC Material

Along with the rapid improvement of our comprehensive national strength and economic strength,the highway transportation as a lifeline project has developed rapidly.And bridge as a transportation throat,the total number of highway Bridges and the overall volume also presents explosive growth.Because of its low cost and simple structure,reinforced concrete ribbed girder bridge is widely used in medium and small span highway bridge in our country,it is a common bridge structure in highway traffic.In the bearing process of reinforced concrete ribbed girder bridge,there are many factors that lead to the failure of bridge walkway plate,such as the gradual degradation of the function of bridge and its components and improper design,construction,operation and maintenance management measures.Under the action of long-term fatigue load,it is of great significance to ensure the overall safety and durability of the reinforced concrete ribbed girder bridge without fatigue damage during the service life.Therefore,necessary measures should be taken to protect the fatigue damage of the bridge,determine the damage area and cumulative damage degree,and predict the fatigue life of the lane plate.Relying on the science and technology project "Research and Development of New Polyurethane elastic Concrete Materials in Cold Areas" of Heilongjiang Provincial Department of Transportation,this project carried out research on the static load and fatigue properties of reinforced concrete rib-beam bridge pavement reinforced concrete reinforced concrete reinforced concrete composite(PUC).The main research contents and achievements are as follows:(1)Through the static load test of undamaged lane plate and damaged lane plate reinforced by PUC material,the static damage mechanism and failure pattern of lane plate and damaged lane plate reinforced by PUC material are revealed.The stiffness,strength and crack resistance of the pavement slab before and after reinforcement were compared and analyzed.The results showed that the PUC reinforced material could greatly enhance the flexural bearing capacity of the pavement slab and significantly improve the overall strength of the structure.(2)Based on the fatigue cumulative damage theory and P-M linear damage criterion,the material fatigue constitutive model was introduced,and the static analysis models of roadway slabs with different fatigue damage degrees were established by ABAQUS finite element analysis software.The prediction model of the flexural bearing capacity of the pavement slabs with different damage degrees was proposed,and the internal law of the static performance of the pavement slabs with different damage degrees was revealed,which laid a foundation for further determining the damage degree of the pavement slabs reinforced by PUC.(3)The fatigue damage mechanism and failure form of the lane plate were revealed through the undamaged lane plate fatigue test,and the nonlinear fatigue damage evaluation index was proposed.Compared with the fatigue load test results of damaged pavement slabs,the effect of PUC reinforced materials on damaged pavement slabs is revealed(4)By using ABAQUS finite element analysis software,the fatigue performance analysis model of the damaged driveway plate strengthened by PUC under different fatigue damage degrees was established,which varied with the number of fatigue load cycles.The ultimate residual bearing capacity of the reinforced driveway plate under different damage degrees was calculated,the prediction model of the flexural bearing capacity of the pavement plate under different damage degrees and different fatigue load cycles was proposed,the development mechanism of the fatigue damage of the pavement plate with the damage degree and fatigue load cycles was revealed,and the reasonable selection range of the damage degree of the pavement plate was determined when the PUC was reinforced.