SHAKING TABLE TEST OF CORRODED STEEL FRAME STRUCTURE UNDER ACIDIC ATMOSPHERE ENVIRONMENT

In order to study the seismic performance of corroded steel frame structures under the acidic atmosphere environment, two five-layer steel frame structures (S1, S2)with different corrosion ratios were designed. The test of S2 was implemented accelerated corrosion by aerosol corrosion box (S1 as the contrast test with no corrosion), and then shaking table tests were carried out. The dynamic properties, acceleration, displacement, stain responses and failure characteristics of two structures were obtained. The rules of seismic performance of steel frame structures with different degree of steel corrosion were also studied. The results reveal the effect of corrosion on the structure, as natural frequency of the structure is decreased by 7.46%~9.76%, while the damping ratio, displacement, and strain increase and the acceleration and shear force reduce. The failure mode of S1 and S2 is similar, as the structure has local bucking failure modes at end of beams, and the degree of plastic deformation of S2 is larger than that of S1. Under the frequent earthquake with an intensity of 8, the seismic response of S2 and S1 is similar, as the difference of seismic response between two structures is more obvious with the increase of the seismic intensity. The research results can provide experimental support for the safety assessment of corroded steel frame.