CFRP-PE-不锈钢筋混凝土短柱的设计方法研究OA北大核心CSTPCD
Study on Design Method of CFRP-PE-stainless Steel-reinforced Concrete Short Column
进行了17个CFRP-PE-不锈钢筋混凝土短柱和8个对比试件的轴压试验,探究不锈钢种类、箍筋间距、CFRP厚度、PE厚度对该类组合柱的破坏模态、荷载-应变曲线、极限应变、极限承载力、延性的影响规律.试验结果表明:在CFRP和混凝土间设置PE垫层能提高该类组合短柱的延性和变形能力,并降低其承载力;增大CFRP厚度可提高其承载力和极限应变,但试件表现出增大的脆性;减小箍筋间距或增大钢筋强度可显著提高其承载力、峰值应变和延性.建立了有限元模型,有限元分析表明:增大PE厚径比会显著提高该类组合短柱的变形能力和延性,并降低CFRP对其承载力的影响;增大配箍率、不锈钢强度、CFRP抗拉强度、CFRP厚度可提升该类组合短柱的极限应变与承载力;提高混凝土强度会提高该类组合短柱的峰值承载力,但降低其极限应变.最终建议了该类组合短柱的延性设计方法、承载力模型和极限应变模型.
Axial compression tests of 17 CFRP-PE-stainless steel-reinforced concrete(CPSSRC)short columns and 8 counterparts were carried out to investigate the influences of the stainless steel type,hoop spacing,CFRP thickness,and PE thickness on the failure mode,load versus strain curve,ultimate strain,ultimate strength and ductility of the CPSSRC short column.The experimental results showed that the PE cushion between CFRP and concrete improved the ductility of the CPSSRC column and reduced its ultimate strength.Increasing the CFRP thickness improved the ultimate strength and ultimate strain of the CPSSRC short column,but increased the brittleness.Reducing hoop spacing or increasing steel strength improved the ultimate strength,peak strain,and ductility of the column.A finite element(FE)model was established.The FE analysis showed that increasing the thickness-to-diameter ratio of the PE cushion significantly improved the deformation capacity and ductility of the CPSSRC short column and reduced the effect of CFRP on its ultimate strength.Increasing the hoop ratio,stainless steel strength,CFRP tensile strength,and CFRP thickness improved the ultimate strain and ultimate strength of the CPSSRC short column.Increasing the concrete strength improved the ultimate strength of the CPSSRC short column but reduced its ultimate strain.Finally,a ductile design method,ultimate strength model,and ultimate strain model for the CPSSRC short column were proposed.
王志滨;宋培;徐辉;邱瑞明;张健斌
福州大学 土木工程学院,福建 福州 350108福州大学 土木工程学院,福建 福州 350108||福建鑫陆建设集团有限公司,福建 福州 350315
土木建筑
CFRP-PE-不锈钢筋混凝土PE垫层延性设计承载力模型有限元模型
CFRP-PE-stainless steel-reinforced concretepolyethylene(PE)cushionductile designultimate strength modelfinite element(FE)model
《湖南大学学报（自然科学版）》 2024 (005)
22-33 / 12
国家自然科学基金面上项目(52178122),National Natural Science Foundation of China(52178122);泉州市科技计划项目(2021C015R),Quanzhou City Science and Technology Program(2021C015R)
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