Experimental study on the damping performance of high-strength concrete columns with different section sizes

Abstract

In this paper, structural columns with cross-section sizes of 100[Formula: see text]mm × 100[Formula: see text]mm, 75[Formula: see text]mm × 150[Formula: see text]mm, and 85[Formula: see text]mm × 121[Formula: see text]mm are designed based on the same notional size of member. The acceleration signals of each column at axial compression ratio of 0.1, 0.2 and 0.3 were obtained by impact hammering. The corresponding frequency and damping ratio are obtained by half power wideband method. Based on the statistical method, the variation rules of acceleration signal characteristics, frequency characteristics and damping characteristics in different thickness directions under different axial compression ratios were analyzed. The correlation between frequency and damping ratio in different thickness directions with different axial compression ratios is discussed. The results show that under the same axial compression ratio, the damping ratio and frequency tend to decrease with the increase of the thickness in the tapping direction. Under the same thickness, the frequency decreases with the increase of the axial compression ratio. The damping ratio of the column decreases with increasing stress ratio when the thickness in the knocking direction is less than 100[Formula: see text]mm. The damping ratio of the column increases with the increasing stress ratio when the thickness in the knocking direction is equal to 100[Formula: see text]mm. The damping ratio of the column increases slightly with the increasing stress ratio when the thickness in the knocking direction is greater than 100[Formula: see text]mm. By fitting the discrete data, the frequency variation range is 229.65–511.07[Formula: see text]Hz, and the range of the damping ratio variation is 0.1–0.5%.