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保持砂卵石压实系数在建议大于87.7%的范围[1],以方钢管壁厚和长细比为主要变化参数,对10根薄壁方钢管砂卵石柱的轴压静力性能进行试验研究,并通过试验对比分析试件的破坏形态、极限承载力、荷载-位移曲线以及荷载-应变曲线等数据。试验结果表明:1壁厚为2mm试件的承载力较低,钢材未达到屈服强度,管壁就已经发生局部屈曲,钢材性能未得到充分发挥;壁厚为4mm的试件的承载力达到500kN~600kN,钢材达到屈服强度,建议钢管壁厚至少为3mm;2试件的极限承载力随长细比增大而降低;3相对于空心方钢管柱,试件的极限承载力有所增加;壁厚从2mm增到4mm,砂卵石与钢管壁的相互作用更加显著。
In order to keep the compaction coefficient of sand-pebble in the range of more than 87.7% [1], the axial compressive properties of 10 thin-walled square steel tube sand-pebble columns were studied by taking the wall thickness and slenderness ratio as the main parameters. The damage morphology, ultimate bearing capacity, load - displacement curve and load - strain curve of the test piece were compared and analyzed through experiments. The test results show that: 1, the bearing capacity of specimens with wall thickness of 2 mm is low, the yield strength of steel does not reach, the local buckling of the wall has occurred and the performance of steel has not been fully exerted; the bearing capacity of specimen with wall thickness of 4 mm reaches 500 kN ~ 600kN, the steel reaches the yield strength, the proposed pipe wall thickness of at least 3mm; 2 specimens ultimate bearing capacity decreases with the slenderness ratio; 3 relative to the hollow square steel column, the ultimate bearing capacity of the specimen has increased; The wall thickness increases from 2mm to 4mm, and the interaction between sand-gravel and steel pipe wall is more significant.