Numerical analysis of flexural performance of corroded prestressed concrete beams under freeze-thaw cycles
ABAQUS was used to establish a three-dimensional finite element model of prestressed concrete beams,and the nonlinear numerical simulation analysis and experimental study of flexural performance of the prestressed concrete beams after freeze-thaw cycles and corrosion were carried out respectively.The load-midspan deflection curve obtained by simulation analysis is in good agreement with the experimental results,which verifies the rationality of the simulation analysis results.On this basis,a finite element model of prestressed concrete beams under the combined action of freeze-thaw cycles and corrosion was established,and the flexural performance of prestressed concrete beams under different parameters was analyzed.The results show that the cracking resistance and flexural bearing capacity of prestressed concrete beams under the combined action of freeze-thaw cycles and corrosion are significantly reduced compared with single environmental factors.There are two typical failure modes of prestressed concrete beams under the combined action of freeze-thaw cycles and corrosion:concrete crushing and prestressed tendon breaking.As the strength of concrete decreases,the number of freeze-thaw cycles increases,and the corrosion rate increases,the ultimate bearing capacity of prestressed concrete beams and the corresponding midspan ultimate deflection show different degrees of attenuation trends;the number of freeze-thaw cycles and the prestress level have a greater impact on the stiffness of the member.
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