Mechanical Properties Analysis Of Cracking And Damage Process On Long-span PC Beam Bridge

With the commencement of the“12th Five-Year Plan”, China’s transportation infrastructureefforts will further increase. Looking back over the past50years of development, we built alot of various types of bridges. In these bridges, prestressed concrete continuous beam bridgebecause of its light weight, large spanning capacity, smooth driving, good durability, iswidely used in a variety of road and urban construction of the bridge. However, with thegrowth of the service time of the prestressed concrete bridge, a large part of the bridge have alot of diseases, especially excessive deflection, cracking damage. At present,the reserch onPrestressed concrete is mainly concentrated in the cause of deflect and crack,the main factorsof the deflection and cracking affect the structure and make the appropriate treatmentmeasures. However, less research on the assessment of the use state and the process oflong-span prestressed beam bridge cracking damage. In order to make an accurate assessmentof the service status of the bridge after cracking, In this paper, the process analysis oflong-span continuous prestressed concrete beam bridge from the finished bridge state toultimate bearing failure as the primary research.By the three-dimensional elastic-plastic solid finite element method, considering thefactors of the box beam spatial effects and material nonlinearity, the paper uses ANSYS, alarge general finite element software, to simulation analysis the mechanical properties of thelong-span prestressed concrete continuous beam bridge from the state of the bridge to thelimits of destructionthe. Under different working conditions, long-span continuous PC boxbeam bridge after cracking and before cracking to the limit and failure process of deflection,stress, cracks and stiffness development changes was researched, which can accuratelycalculate the cracking load and ultimate loads. It plays an active role in the assessment andstrengthening of the bridge bearing capacity.By this means paper can get the cracking load and ultimate load of the three conditionsunder the action of the main beam, cracking area of the main beam and stress, deflection andstiffness changes in the main beam damage process, which can make a accurate assessmentfor in battle damaged bridge...