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Effectiveness of high-strength concrete when used in circular steel tubes filled with concrete

机译：高强度混凝土在圆钢管中的有效性

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The paper discusses the possibility of using high strength concrete in case of steel tubular columns filled with concrete subjected to compression. The data introduced in this paper were obtained within the research programme focused on behaviour of steel tubular columns filled with concrete. The research has been carried out in order to investigate the effect of the concrete strength and the yield stress of the steel tube on the buckling resistance. Experimental analysis was performed within the research. Circular steel tubes without concrete, filled by normal concrete and filled by high-strength concrete have been taken into account within the solution. The aim of this paper is to investigate effectiveness of use of high-strength concrete from two points of view. At first, attention is paid to buckling resistance of the tubes filled with concrete. Results of experimental analysis are evaluated in order to find out what an influence of high-strength concrete on the buckling resistance is. Next aspect, there is a stiffness of composite columns made from steel tube filled with concrete. Evaluating of stiffness was carried out by means of Southwell lines, which is useful instrument for obtaining information about behaviour of compressed columns.
机译：本文讨论了在钢管混凝土柱受压的情况下使用高强度混凝土的可能性。本文介绍的数据是在研究程序中获得的，该研究程序专注于钢管混凝土柱的性能。为了研究钢管的混凝土强度和屈服应力对抗屈曲性的影响，进行了研究。在研究范围内进行了实验分析。解决方案中考虑了不带混凝土的圆形钢管，普通混凝土填充的钢管和高强度混凝土填充的钢管。本文的目的是从两个角度研究使用高强度混凝土的有效性。首先，要注意填充混凝土的管的抗屈曲性。为了确定高强度混凝土对抗屈曲性的影响，对实验分析结果进行了评估。下一个方面，由填充有混凝土的钢管制成的复合柱具有一定的刚度。刚度的评估是通过Southwell线进行的，它是获得有关压缩柱行为的有用工具。

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