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Behaviour of FRP tube-concrete-encased steel composite columns

机译：FRP管混凝土包裹钢组合柱的性能

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摘要

Fibre-reinforced polymer (FRP) tube-concrete-encased steel (FTCES) column, which consists of an FRP tube, encased steel section and concrete filled between them, attracts the attention of more and more researchers since it has excellent corrosion resistance, superior strength, stiffness and ductility. However, experimental studies on FTCES columns are relatively limited compared with other composite columns, such as concrete-filled-steel-tube columns. Moreover, existing analytical models predicting the load-strain relationships on the FTCES columns were all design-oriented models. A scientifically more rigorous analysis-oriented model is required to explain the complicated physical conditions at the interface among concrete, encased steel and FRP tube, which should consist of a concrete dilation model based on equilibrium and compatibility conditions. Herein, to understand more thoroughly and simulate the uni-axial performance of FTCES columns, an experimental study, consisting of 41 specimens has been conducted. The main parameters are FRP tube thickness, encased steel shape and ratio. Moreover, an analysis-based path dependent load-strain model, previously developed by the authors for the FRP tube-confined concrete columns, has been modified for the FTCES columns. The validity of the proposed model is confirmed by the good agreement obtained between the measured axial load-strain curves of FTCES columns and the theoretically proposed values.
机译：纤维增强聚合物（FRP）管混凝土包裹钢（FTCES）柱由FRP管，包裹的钢型材和填充在两者之间的混凝土组成，由于其优异的耐腐蚀性，优异的抗腐蚀性能而吸引了越来越多的研究人员的注意。强度，刚度和延展性。但是，与其他复合柱（如钢管混凝土柱）相比，FTCES柱的实验研究相对有限。而且，现有的预测FTCES色谱柱上的载荷－应变关系的分析模型都是面向设计的模型。需要一个更加科学严谨的面向分析的模型来解释混凝土，包裹钢和FRP管之间界面处的复杂物理条件，该模型应包括一个基于平衡和相容条件的混凝土膨胀模型。在此，为了更透彻地理解和模拟FTCES色谱柱的单轴性能，已进行了由41个样品组成的实验研究。主要参数是玻璃钢管的厚度，包钢的形状和比例。此外，作者先前为FRP管约束混凝土柱开发的基于分析的基于路径的载荷应变模型已针对FTCES柱进行了修改。 FTCES圆柱的轴向载荷-应变曲线的实测值与理论值之间的良好一致性证明了所提模型的有效性。

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