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通过6根外包聚对苯二甲酸乙二醇酯(PET)纤维布的中空夹层镂空圆钢管混凝土柱的拟静力试验,研究了外钢管厚度、外钢管镂空率和内钢管管径等参数对其水平承载力的影响。试验结果表明:其他参数不变时,与未开孔柱相比,外钢管厚度为5 mm且开孔的柱,其屈服荷载与极限荷载分别降低了17%和18%,外钢管厚度为4 mm且开孔的柱,其屈服荷载与极限荷载分别降低了61%和23%;内径增大了20%的柱,其屈服荷载与极限荷载平均分别增大了53%和6%;与外钢管厚度为4 mm的柱相比,外钢管厚度为5 mm的柱屈服荷载与极限荷载平均增加了57%和29%。基于已有的计算模型,提出了外包PET中空夹层镂空圆钢管混凝土柱水平承载力的计算模型,并通过与试验结果的对比验证了该模型的准确性。
Through the pseudo-static tests of 6 hollow concrete hollow-walled columns filled with polyethylene terephthalate (PET) fiber cloth, the parameters of outer steel pipe thickness, outer steel pipe hollowness and inner steel pipe diameter were studied Its horizontal bearing capacity. The results show that when the other parameters are constant, the outer tube thickness is 5 mm and the perforated column has a lower yield stress and ultimate load of 17% and 18% mm and open-ended columns, yield and ultimate loads were reduced by 61% and 23%, respectively; while the yield and ultimate loads were increased by 53% and 6%, respectively, for columns with 20% The column yield load and the ultimate load increased by 57% and 29%, respectively, on average for columns with an outer tube thickness of 5 mm compared to columns with a 4 mm tube thickness. Based on the existing calculation model, the calculation model of the horizontal bearing capacity of hollow steel tubular hollow CFST with outsourcing PET was proposed. The accuracy of the model was verified by comparison with the experimental results.