EXPERIMENTAL RESEARCH ON SEISMIC PROPERTIES OF PRESTRESSED CONCRETE BEAMS IN SIMULATED ACID RAIN

In order to study seismic properties of prestressed concrete beams in acid rain corrosion environment, the quasi-static loading tests on 8 prestressed concrete beam specimens were conducted, the failure modes of specimens and the characteristics of the hysteresis curve, skeleton curve, ductility, energy dissipation capacity and stiffness degradation of the beams with different parameters were studied, the effects of concrete strength grades, prestressed levels, and corrosion rates of steel strands on its seismic properties were discussed.The experiment study indicated that prestressed concrete beams during the loading process experienced the stage of elasticity, yield and failure; the hysteresis curves of the prestressed concrete beams were relatively full, the residual deformation was larger and the seismic behaviors were better. The corrosion rate of the steel strand had the greatest impact on the seismic properties. With the increase of the corrosion rate, the ultimate bearing capaicty of the test beams decreased, the hysteretic curve fullness and the cycles of loading decreased constantly.