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首页> 外文会议>International Conference on Composite Construction in Steel and Concrete; 20040718-23; Mpumalanga(ZA) >THE BEHAVIOUR OF CIRCULAR CONRETE-FILLED THIN-WALLED STEEL TUBES IN FLEXURE
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THE BEHAVIOUR OF CIRCULAR CONRETE-FILLED THIN-WALLED STEEL TUBES IN FLEXURE

机译：圆钢管混凝土弯曲薄壁钢管的性能

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摘要

Concrete filled steel tubes (CFTs) are efficient members in structural applications including bridges, buildings and piled foundations. Their design has been based on theory and tests on columns under load applied axially or at relatively small eccentricities. For loading at large eccentricities or loading in pure flexure in the beam situation, there has been relatively little research performed and design has been based on extrapolation from the column situation. Therefore, an extensive research program on the flexural behavior of CFTs has been undertaken at the University of Western Sydney with a particular emphasis on thin-walled steel tubes that can provide an economical form of construction. Numerical studies have been used to investigate the influence of imperfections and plasticity on the behavior of bare steel tubes and this work was extended to examine the effect of the concrete infill on the behavior, particularly local buckling of the steel tube. A series of flexural tests has been carried out on full-scale tube specimens, both filled and unfilled. Accurate measurements of the imperfections were taken using an innovative method allowing the complete imperfect shape of the tube to be determined. This was needed for the analytical studies. The results have allowed the influence of the concrete infill on the flexural stiffness and strength of the tubes to be established. The test results and the analytical studies are being used to develop a design procedure that accounts for imperfections, local buckling, concrete strength, steel strength and the interaction between the tube and the infill.
机译：钢管混凝土（CFT）是结构应用（包括桥梁，建筑物和桩基）中的有效构件。他们的设计基于理论和在轴向施加载荷或偏心率较小的情况下在圆柱上进行的测试。对于大偏心载荷或在梁情况下的纯挠曲载荷，进行的研究相对较少，并且设计是基于柱情况的外推法进行的。因此，西悉尼大学已开展了有关CFT挠曲性能的广泛研究计划，其中特别着重于可提供经济形式的构造的薄壁钢管。数值研究已被用来研究缺陷和可塑性对裸钢管性能的影响，这项工作被扩展到检验混凝土填充物对钢管性能，特别是钢管局部屈曲的影响。已对满刻度和不满刻度的全尺寸试管样品进行了一系列挠曲测试。使用创新方法对缺陷进行精确测量，可以确定管子的完整缺陷形状。分析研究需要这样做。结果允许建立混凝土填充物对管的弯曲刚度和强度的影响。测试结果和分析研究用于制定设计程序，以考虑缺陷，局部屈曲，混凝土强度，钢强度以及管与填料之间的相互作用。

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