Flexural behaviour of concrete-filled stainless steel SHS and RHS tubes strengthened by CFRP
Flexural behaviour of concrete-filled stainless steel SHS and RHS tubes strengthened by CFRP
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CFRP 增强不锈钢 SHS 和 RHS 混凝土管的弯曲性能
DOI：
10.1016/j.tws.2017.10.016
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发表时间：
2018
影响因子：
6.4
通讯作者：
Huang Junfei
中科院分区：
文献类型：
--
作者：
Chen Yu;Feng Ran;He Kang;Chen Xixiang;Huang Junfei
本文对不锈钢方钢管和矩形钢管混凝土的面内弯曲进行了试验研究和数值模拟。共测试了32个试件，其中四分之一的试件未加固以供比较。给出了试件的极限强度、破坏模式、抗弯刚度、延性和纵向应变。还进行了相应的有限元分析（FEA），并根据试验结果进行了校准。通过验证的有限元模型进行了广泛的参数研究，调查CFRP的增强效果的不锈钢SHS和RHS管填充混凝土的弯曲性能。结果表明，随着β值的增大，碳纤维布的加固效果提高。而延性比则大大恶化。在实际应用中，建议将割线刚度取为0.6Mu作为CFRP加固不锈钢方钢管和方钢管混凝土的抗弯刚度。另一方面，不锈钢管和不锈钢管混凝土的抗弯强度和抗弯刚度随着不锈钢管与混凝土之间的界面摩擦系数的增加而增加，直到0.6。在现行钢管混凝土设计规范的基础上，进一步考虑CFRP的抗弯强度和抗弯刚度，提出了CFRP加固不锈钢方钢管混凝土和不锈钢方钢管混凝土的抗弯强度和抗弯刚度设计公式，并通过有限元分析验证了公式的准确性。
This paper presents the experimental and numerical investigations on concrete-filled stainless steel square and rectangular hollow section (SHS and RHS) tubes subjected to in-plane bending. A total of 32 specimens were tested, in which one fourth of test specimens were unstrengthened for comparison. The ultimate strengths, failure modes, flexural stiffness, ductility and longitudinal strains of test specimens are reported. The corresponding finite element analysis (FEA) was also performed and calibrated against the test results. An extensive parametric study was carried out by using the verified finite element model to investigate the strengthening effect of CFRP on the flexural behaviour of concrete-filled stainless steel SHS and RHS tubes. It is shown from the comparison that the strengthening effect of CFRP was improved with the increase of theβvalue. Whereas, the ductility ratio was greatly deteriorated. Furthermore, the secant stiffness at 0.6Muwas recommended to be the flexural stiffness of concrete-filled stainless steel SHS and RHS tubes strengthened by CFRP in the practical applications. On the other hand, the flexural strength and flexural stiffness of concrete-filled stainless steel SHS and RHS tubes were increased with the increase of interface friction coefficient between stainless steel tube and concrete up to 0.6. The design formulae are also proposed for the flexural strengths and flexural stiffness of concrete-filled stainless steel SHS and RHS tubes strengthened by CFRP based on the current design rules for concrete-filled steel tubes by further considering the flexural strengths and flexural stiffness of the CFRP, which were verified to be accurate by the finite element analysis results.
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影响因子：
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