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CFRP约束型钢再生混凝土组合柱轴压性能有限元非线性分析
Finite element analysis on axial compression behavior of CFRP confined steel reinforced recycled concrete composite columns
投稿时间:2021-12-24  修订日期:2022-05-19
DOI:
中文关键词:  碳纤维  型钢再生混凝土  组合柱  轴压性能  有限元分析
英文关键词:Carbon fiber  Steel reinforced recycled concrete  Composite columns  Axial compression behavior  Finite element analysis
基金项目:国家自然科学(51408485),陕西省自然科学基础研究计划项目(2021JM-333).
作者单位邮编
马辉 西安理工大学 土木建筑工程学院
河南省城乡规划设计研究总院股份有限公司
西安理工大学水利水电土木建筑研究设计院 
710048
杨藩婷 河南省城乡规划设计研究总院股份有限公司 450044
黄成 西安理工大学 土木建筑工程学院 710048
潘秀珍 西安理工大学 土木建筑工程学院 710048
赵艳丽 西安理工大学水利水电土木建筑研究设计院 710048
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中文摘要:
      在碳纤维(CFRP)约束型钢再生混凝土组合柱轴压试验的基础上,采用ABAQUS有限元软件对组合柱进行非线性分析,考虑纤维布层数、再生粗骨料取代率、再生混凝土强度、配钢率以及长细比对组合柱轴压性能的影响,获取了组合柱的变形图、应力云图以及荷载-位移曲线;计算结果与试验结果吻合较好,验证了数值模型建立的合理性,并对组合柱进行了参数拓展分析。结果表明:再生混凝土先发生塑性变形,随后型钢、纵筋相继屈服,最后CFRP达到极限抗拉强度被拉断而导致组合柱发生破坏;再生粗骨料取代率对组合柱的承载力及变形能力具有一定的不利影响;随着再生混凝土强度的提高,构件的承载力增幅较大,但延性变差;纤维布层数对组合柱承载力和变形能力影响显著,承载力最大增幅为55.2%;长细比增大对组合柱的轴压性能产生不利影响。基于叠加原理提出CFRP约束型钢再生混凝土组合柱的轴压承载力计算公式,研究结论为CFRP应用于型钢再生混凝土组合结构提供技术参考。
英文摘要:
      Based on the axial compression test of CFRP confined steel reinforced recycled concrete composite columns (CSRRC), the nonlinear analysis of composite columns is carried out by using ABAQUS finite element software. Considering the effects of fiber cloth layers, recycled coarse aggregate replacement rate, recycled concrete strength, steel ratio and slenderness ratio on the axial compression performance of composite columns, the deformation diagram of composite columns is obtained Stress nephogram and load displacement curve; The calculated results are in good agreement with the experimental results, which verifies the rationality of the numerical model, and the parameter expansion analysis of the composite column is carried out. The results show that the recycled concrete deforms first, then the section steel and longitudinal reinforcement yield successively, and finally the CFRP reaches the ultimate tensile strength and is pulled off, resulting in the failure of the composite columns. The replacement rate of recycled coarse aggregate has a certain adverse effect on the bearing capacity and deformation capacity of composite columns. With the increase of recycled concrete strength, the bearing capacity of members increases greatly, but the ductility becomes worse. The number of fiber cloth layers has a significant effect on the bearing capacity and deformation capacity of composite columns, and the maximum increase of axial bearing capacity is 55.2%. The increase of slenderness ratio has an adverse effect on the axial compression performance of composite columns. Based on the superposition principle, the calculation formula of axial compressive bearing capacity of CSRRC is proposed. The research conclusion provides a technical reference for the application of CSRRC.
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