钢管混凝土钢管混凝土(concrete-filled square steel , CFST)出现局部腐蚀时，其抗冲击性能会受到明显影响。为此，利用ABAQUS建立了方形高强钢管混凝土柱(high-strength concrete-filled square steel ,HSCFST)数值模型，考虑开缝角度、开缝长度、冲击面和冲击能等参数对HSCFST柱抗冲击性能的影响。结果表明：局部穿透腐蚀影响下，水平开缝的正面冲击构件的裂缝会出现闭合现象，而侧面冲击构件破坏时裂缝呈现“三角形”形态；冲击力平台值主要受冲击面的影响，其次是开缝角度，而开缝长度主要对承受背面冲击的构件影响较大；开缝角度的增大和开缝长度的减小与冲击力平台值的提高成正比，承受正面冲击的构件其抗冲击性能优于承受侧面和背面冲击的构件。减小开缝角度会增大构件的跨中挠度，受正面冲击的构件的跨中挠度要小于受背面和侧面冲击的构件；构件的能量吸收率与开缝长度的增加成正比，与开缝角度的增大成反比，受背面冲击的构件的能量吸收率最高，正面冲击则最小。基于大量参数分析结果，提出了局部穿透腐蚀作用下HSCFST柱的动力抗弯承载力影响系数的实用计算方法。
Abstract
When concrete-filled steel tube shows local corrosion, its impact resistance will be significantly affected. Therefore, the numerical model of high-strength concrete-filled square steel tubular column (HSCFST) is established by using ABAQUS. The effects of crack angle, crack length, impact surface and impact energy on the impact resistance of HSCFST column are considered. The results show that under local penetrating corrosion, the horizontal crack in the model under front impact will close, while the horizontal cracks in the models under side impact will appear "triangular" shape when the models are damaged. The impact force platform value is mainly affected by the impact surface, followed by the crack angle. The crack length mainly has a great influence on the models under rear impact. The increase of the crack angle and the decrease of the crack length are directly proportional to the increase of the impact force platform value. The impact resistance of the model bearing the front impact is better than that of the model bearing the side and back impact. Reducing the crack angle will increase the mid-span deflection of the member. The mid-span deflection of the member under front impact is less than that of the member under rear and side impact. The energy absorption rate of the model is directly proportional to the increase of the crack length and inversely proportional to the increase of the crack angle. The energy absorption rate of the models subjected to back impact is the highest, while that to front impact is the lowest. A practical calculation method for the improvement coefficient of dynamic flexural capacity of HSCFST columns under local penetrating corrosion is proposed.
关键词
横向冲击 /
钢管混凝土 /
穿透损伤 /
动力响应
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Key words
Lateral impact /
concrete-filled square steel /
penetrating damage /
dynamic response
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