Experiment Study On Seismic Performance Of Prestressed Concrete Beams In Simulated Acid Rain Environment

Acid rain has become a increasingly prominent environmental problem in the current,it influenced on our country's infrastructures more and more prominent and obvious.As one of the most widely used structural engineering forms,prestressed concrete structures subject to environmental corrosion.In recent years,the safety and durability of prestressed concrete structures have become a hot research direction.Previously,technical personnel thought that prestressed concrete structures' damping was small,energy performance was poor but seismic response was strong,so seismic performance was poor when it was used.With further research,it is found that the seismic behavior of prestressed concrete structures is better than people's imagination.Prestressed concrete structure with the characteristic of recovery performance is better,residual deformation and the degree of structural damage are smaller after the earthquake and the costs for repair is cheaper.Now,there is almost none research on seismic performance of prestressed concrete beams in acid rain environment.This article is that research and analysis seismic performance of prestressed concrete beams after corroded in the simulated acid rain environment.The main contents are as follows:1.The experiment designed and produced eight prestressed concrete beams.Prestressing strands of prestressed concrete beams were corroded with the accelerative electrifying corrosion method based on the Faraday law to obtain that the corroded prestressed concrete beams in the simulated acid rain environment.2.Study the failure process and ultimate failure mode of all the test beams in the process of the low cycle reversed load.Obtain prestressing strands after destroying all the test beams which had been tested in the low cycle repeated load,and observed.3.According to the collected experimental data,research the corroded prestressed concrete beams' seismic performance like hysteresis loops,skeleton curve,displacement ductility factor,stiffness degradation and energy dissipation coefficient.Analysis the influence of strand corrosion rate,partial prestressing ratios and concrete strength on seismic behavior of test beam.