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ANALYSIS ON BLAST-RESISTANT PERFORMANCES OF CONCRETE-FILLED STEEL TUBE COLUMNS CONFINED WITH FRP UNDER AXIAL COMPRESSION
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摘要: 为研究纤维增强复合材料（FRP）约束钢管混凝土轴心受压柱的抗爆性能，运用有限元软件ANSYS/LS-DYNA对16根轴心受压柱试件在爆炸荷载作用下的动力响应进行数值模拟分析，并采用参数化分析的方法研究轴压比、长细比、FRP粘贴方式及FRP种类对试件抗爆性能的影响。结果表明：轴压比不超过0.5时，轴压力的存在能提高试件的抗爆性能，而轴压比超过0.5以后，轴压力的存在会极大地削弱试件的抗爆性能；长细比越大，试件的跨中位移越大，抗爆性能越差；粘贴FRP能提高试件的抗爆性能，且采取合理的局部粘贴方式可达到与全柱粘贴相接近的约束效果；在其他参数不变的情况下，粘贴碳纤维增强复材比粘贴玻璃纤维增强复材更能有效提高试件的抗爆性能。Abstract: In order to study the blast-resistant capacity of concrete-filled steel tube columns confined with fiber-reinforced polymer(FRP) under axial compression, the numerical simulations and analysis on the dynamic response of 16 axial compressive column specimens subjected to blast loads was calculated by finite element software ANSYS/LS-DYNA. And the effects of axial compression ratios, slenderness ratios, the pasting method of FRP sheets and the type of FRP sheets on the blast resistant capacity of specimens were studied by parametric analysis. The results showed that when the axial compression ratio was not exceed 0.5, the existence of axial pressure could improve the anti-detonation performances of the specimens, however, when the axial compression ratio was greater than 0.5, the existence of axial pressure greatly weakened the anti-detonation performances of the specimens. With the increase of slenderness ratios, the mid-span displacement of the specimens increased, and the blast resistant capacity decreased. Pasting FRP sheets could improve the anti-explosion performances of the specimens, and the specimens locally pasted FRP with reasonable design could achieve the constraint effect with those fully pasted. Under the condition that other parameters remained unchanged, pasting CFRP sheets was more effective in improving the blast-resistant performances of specimens than pasting GFRP sheets.
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