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Behavior and modelling of FRP-concrete-steel hybrid double-skin tubular columns under repeated unloading/reloading cycles

机译：重复卸载/重新加载循环下FRP - 混凝土钢混合双皮管柱的行为与建模

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Fiber-reinforced polymer (FRP)-concrete-steel hybrid double-skin tubular columns (hybrid DSTCs) consist of an outer FRP tube, an inner steel tube and a concrete infill between the two tubes. Extensive research has been conducted on the monotonic behavior of hybrid DSTCs, but only a limited number of studies have examined their behavior under cyclic axial compression. In particular, no systematic experimental study has been conducted on hybrid DSTCs under repeated unloading/reloading cycles. This paper first presents a systematic experimental study on hybrid DSTCs under two types of loading schemes: (a) a single unloading/reloading cycle to evaluate the relationship between the unloading strain and the plastic strain; (b) repeated unloading/reloading cycles to investigate the effect of loading history. In the present study, hybrid DSTCs were prepared using filament-wound FRP tubes of a relatively large scale (up to 300 mm in diameter), and the experimental program covered a wide range of concrete strengths (from 40.9 MPa to 104.4 MPa). The systematic experimental study with extensive instrumentation allowed the cyclic stress-strain behavior of the concrete in hybrid DSTCs to be examined in detail, clarifying the cumulative effect of the loading history on both the stress deterioration and the plastic strain of the concrete. This paper also presents a detailed comparison between the test results and the predictions of an existing cyclic stress-strain model for FRP-confined concrete in solid columns, in terms of the repeated unloading/reloading cycles. The cyclic stress-strain model is shown to provide reasonably accurate predictions, and thus can be used together with a monotonic stress-stress model for the concrete in hybrid DSTCs to predict the complete cyclic stress-strain curve of such concrete.
机译：纤维增强聚合物（FRP） - 钢混合式双皮管状管状柱（混合DSTC）由外膛管，内钢管和两个管之间的混凝土填充组成。已经在混合DSTC的单调行为上进行了广泛的研究，但只有有限数量的研究已经检查了循环轴向压缩下的行为。特别地，在重复卸载/重新加载循环下，在杂交DSTC上没有进行系统实验研究。本文首先介绍了两种装载方案下的混合DSTC的系统实验研究：（a）单个卸载/重新加载循环，以评估卸载应变与塑料应变之间的关系; （b）重复卸载/重新加载循环，以研究装载历史的效果。在本研究中，使用相对大规模的长丝缠绕的FRP管（直径高达300mm）制备杂种DSTC，并且实验程序覆盖了各种混凝土强度（从40.9MPa至104.4MPa）。具有广泛仪器的系统实验研究允许详细研究混合DSTC中混凝土的循环应力 - 应变行为，阐明了负载历史对混凝土的应力劣化和塑性应变的累积效应。本文还提出了测试结果与固体柱中现有循环应力 - 应变模型的测试结果和预测的详细比较，就重复卸载/重新加载循环而言。循环应力 - 应变模型被示出为提供合理的准确预测，因此可以与混合DSTC中的混凝土的单调应力 - 应力模型一起使用，以预测这种混凝土的完整循环应力 - 应变曲线。

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