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Experimental study on high strength concrete encased steel composite short columns

机译：高强混凝土包裹钢组合短柱的试验研究

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This paper investigates on the axial compressive behavior of high strength Concrete Encased Steel (CES) composite short columns. Six column specimens made of high strength concrete were tested under monotonic pure compression. The structural performance was investigated including failure pattern, load-carrying capacity, load-deformation response, and post peak ductility. The major parameters affecting the ultimate strength of such composite columns are studied including concrete strength, spacing of transverse reinforcement bars, and the inclusion of steel fibers in the high strength concrete. Based on the experimental work, it is found that the failure mode of CES columns with high concrete strength C120 is characterized by concrete cover spalling, which triggers a sudden drop of compression capacity once the peak resistance is reached. With the decrease of transverse reinforcement spacing, the ultimate load capacity of high strength CES columns can be enhanced due to better concrete confinement but the failure is still brittle with abrupt unloading from the peak load. The test results also indicated that the provision of 0.5% volume of steel fiber is able to prevent the concrete cover spalling, and hence the load carrying capacity can be enhanced. Finally, the test results together with additional test data collected from the literature are used for comparison with codes' prediction using the EN 1994-1-1 and JGJ 138-2016. The code methods give excellent prediction of CES columns with normal strength steel and concrete grade up to C90, but they over-estimate the maximum resistance of CES columns with concrete strength higher than 90 MPa. To extend the current design methods for CES members with higher strength concrete, two analytical methods were proposed which shows good correlation with test results, thus enabling the design of CES members with higher strength of concrete. (C) 2019 Elsevier Ltd. All rights reserved.
机译：本文研究了高强度混凝土包裹钢（CES）复合短柱的轴向压缩性能。在单调纯压缩下测试了六个由高强度混凝土制成的圆柱试样。研究了结构性能，包括破坏模式，承载能力，负载变形响应和峰值后延性。研究了影响此类复合材料柱极限强度的主要参数，包括混凝土强度，横向钢筋的间距以及高强度混凝土中钢纤维的含量。根据实验工作，发现高混凝土强度C120的CES柱的破坏模式具有混凝土覆盖层剥落的特征，一旦达到峰值阻力，就会触发压缩能力的突然下降。随着横向钢筋间距的减小，高强度CES柱的极限承载力可以通过更好的混凝土约束而得到增强，但由于峰值载荷的突然卸载，破坏仍然很脆弱。试验结果还表明，提供0.5％体积的钢纤维能够防止混凝土表层剥落，因此可以提高承载能力。最后，将测试结果以及从文献中收集到的其他测试数据用于与EN 1994-1-1和JGJ 138-2016的代码预测进行比较。编码方法可以很好地预测普通强度为C90的普通强度钢和混凝土的CES柱，但是它们高估了混凝土强度高于90 MPa的CES柱的最大抗力。为了扩展目前高强度混凝土CES构件的设计方法，提出了两种与试验结果具有良好相关性的分析方法，从而使高强度混凝土CES构件的设计成为可能。 （C）2019 Elsevier Ltd.保留所有权利。

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