The damping property of damaged recycled aggregate concrete after loading

Abstract

This paper uses the method of free vibration attenuation to test the damping property of recycled concrete with different recycled aggregate replacement rates under different load. The change law of acceleration signal in frequency, the change law of vibration frequency, the change law of damping, and the data distribution of frequency and damping ratio under different damages are respectively analyzed. The correlation between frequency, damping ratio and load level is analyzed. The analysis shows that under different recycled aggregate replacement rates, as the load level increases, the frequency shows a decreasing trend. From complete state to crushed, the frequency reduction is 32.6%, 37.6%, 63.5, 68.1%, respectively to R0, R30, R50, R70. Under maximum load, at 0 recycled aggregate replacement rate, the damping ratio increases from 0.025 to 0.026. At 100% recycled aggregate replacement rate, the damping ratio increases from 0.031 to 0.046. As the load level increases, the correlation between frequency and damping ratio generally shows an increasing trend, and the slope of the linear fit is 0.069. As the load level increases, the correlation between frequency and damping ratio generally shows a downward trend, and the slope of the linear fit is 0.011.