Study on Degradation of Prestressed Concrete Beams in Hydrochloric Acid Environment Based on Stochastic Process

The durability problem of concrete and prestressed concrete structures caused by corrosive effects of various media in the environment has become a hot topic in engineering and academic circles. However, the research results on the deterioration of prestressed concrete performance under various corrosive media in typical industrial environment are still insufficient. Combined with acidic industrial environment of the corrosive medium, the corrosion mechanism of prestressed concrete is clarified, and on this basis, time-varying models of prestressed concrete material with engineering practicability is explored. An original model of concrete strength degradation described with pH is established, and a constitutive model considering the stress corrosion of the prestressed strand is put forward. Based on the stochastic process theory of component resistance and the corrosion degradation model of materials, the time-varying performance analysis of corroded components with bearing capacity is carried out using the statistical theory and the Monte-Carlo event-based simulation. Compared with the existing test results the accuracy of the material deterioration model is verified. At the same time, according to the simulation results, it is concluded that the corrosion of steel bars in the elastic stage has little influence on the mechanical properties, but has great influence on the stiffness and bearing capacity of the beam after cracking.