Effect of compaction factor on the mechanical property of square thin-walled steel tube columns filled with sandy pebble under impact load

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (2) : 177-184.

XU Gang,YAO Yong,DENG Yongjun,WANG Mingming,LU Li

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Abstract

Square thin-walled steel tube columns filled with sandy pebble were tested under different compaction factors and lateral impacts by a drop-hammer-tester. In the experiment,time-history curves were recorded,together with the damage form and residual deformation of specimens. Based on the damage assessment criteria of residual capacity,the index of damage degree was introduced and defined to evaluate the damage of square thin-walled steel tube columns under different impact loads. Moreover,the relationship between the compacting factor and damage degree was analyzed. The results show that the damage of specimens is mainly owing to the local failure with a certain amount of overall bending under lateral impact. The impact energy is dissipated not only by the plastic hinge energy consumption due to plastic deformation,but also the filled sandy pebble,and the more tightly compacted,the more energy consumed. Thus,the columns filled with sandy pebble show a favorable anti-collision performance. Within a certain range of compaction factor,the damage degree first increases then decreases with the increase of compaction factor,and its changing rate is greater when the discrete degree of sandy pebble is smaller.

Key words

compaction factor / sandy pebble / square thin-walled steel tube column / impact load / damage degree

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XU Gang,YAO Yong,DENG Yongjun,WANG Mingming,LU Li. Effect of compaction factor on the mechanical property of square thin-walled steel tube columns filled with sandy pebble under impact load[J]. Journal of Vibration and Shock, 2017, 36(2): 177-184

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