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EXPERIMENTAL RESEARCH ON POLYPROPYLENE FIBER MORTAR FILLED STEEL TUBULAR SHORT COLUMNS SUBJECTED TO DYNAMIC LOAD
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摘要: 对3根钢管普通混凝土短柱和6根钢管聚丙烯纤维砂浆短柱进行轴压动态试验，研究应变率、径厚比对钢管聚丙烯纤维砂浆短柱动态力学性能的影响。试验结果表明：应变率为10-4s-1时，壁厚为2 mm的钢管聚丙烯纤维砂浆短柱相对于准静态应变率=10-5s-1时其极限承载力、初始弹性模量分别提高了5.80%、42.8%，峰值荷载对应的应变降低了6.77%。在试验参数范围内，在极限承载力、峰值荷载应变上，钢管聚丙烯纤维砂浆短柱比钢管普通混凝土短柱对应变率更敏感；在弹性模量上，钢管普通混凝土短柱比钢管聚丙烯纤维砂浆短柱对应变率更敏感。
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关键词:
- 应变率 /
- 弹性模量 /
- 钢管聚丙烯纤维砂浆短柱 /
- 极限承载力
Abstract: A total of 3 concrete filled steel tubular short columns and 6 polypropylene(PP) fiber mortar filled steel tubular short columns were tested under axial compression dynamic load.The influence of the strain rate and diameter thickness ratio on the dynamic performance of the PP fiber mortar filled steel tubular short columns was investigated.The test results showed that the ultimate bearing capacity and the initial elastic modulus were increased by 5.80% and 42.8% respectively, while the strain of peak load was decreased by 6.77% when the two millimetres of PP fiber mortar filled steel tubular short column with the strain rate of =10-4 s-1 was compared with the strain rate of =10-5 s-1.In the scope of test parameters, strain rate was more effective to PP fiber mortar filled steel tubular short column than concrete filled steel tubular short column in the scope of ultimate bearing capacity and the peak load strain, while the result was opposed in the elastic modulus. -
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