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首页> 外文期刊>Magazine of Concrete Research >Long-term behaviour of square concrete-filled steel tubular columns under axial service loads
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Long-term behaviour of square concrete-filled steel tubular columns under axial service loads

机译：方形钢管混凝土柱在轴向服务载荷下的长期性能

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摘要

This paper presents experimental and analytical studies on the long-term behaviour of rectangular concrete-filled steel tubular (CFT) columns under central axial loading. Four loading cases are considered in this study: (a) a load applied simultaneously on both the inner concrete and steel tube (SCE); (b) a load applied only on the inner core concrete (CE); (c) a load applied on the steel tube and three quarters of the inner concrete (SCQ); and (d) a load applied on the steel tube and half of the inner concrete (SCH). The last two loading cases (SCQ and SCH) simulate a diaphragm installed in the steel tube. Specimens measuring 600 mm in length were tested for the first two loading cases (SCE and CE), and specimens of three different lengths, 600, 900 and 1200 mm, were tested for the last two loading cases in order to investigate the effect of the diaphragm size and the length of the specimen on the long-term behaviour of rectangular CFT columns. In addition to the experimental study, three-dimensional finite element models for each specimen were established and verified from a comparison of the test data and the analysis results. From the test and analysis results, a number of conclusions can be drawn. The magnitude of long-term deformation of a CFT column with a diaphragm that covers more than a half of the cross-sectional area of the inner concrete is identical with that of a column under a load applied simultaneously on the entire section of the steel tube and the inner concrete. The diaphragm confines the lateral deformation of the end surface of the column, and its influence range is limited only to the end part of the column, meaning it is limited only from the surface to a depth as long as the width of the CFT column. The confinement effect and stress variation along the longitudinal axis do not occur except in the influence range of the diaphragm. In the case of loading only at the inner concrete, the inner concrete is confined at the corner by the steel tube, and the slip between the inner concrete and the steel tube increases over time.
机译：本文介绍了矩形钢管混凝土（CFT）柱在中心轴向载荷下的长期性能的实验和分析研究。在这项研究中考虑了四个荷载情况：（a）同时施加在内部混凝土和钢管上的荷载（SCE）； （b）仅施加在内芯混凝土（CE）上的载荷； （c）施加在钢管和四分之三内混凝土上的载荷； （d）施加在钢管和一半内部混凝土（SCH）上的载荷。最后两个加载工况（SCQ和SCH）模拟安装在钢管中的隔膜。在前两个加载情况（SCE和CE）中测试了长度为600 mm的标本，在后两个加载情况中测试了三种不同长度（600、900和1200 mm）的标本，以便研究膜片的尺寸和试样的长度对矩形CFT柱的长期性能影响很大。除了实验研究，还建立了每个样本的三维有限元模型，并通过比较测试数据和分析结果进行了验证。从测试和分析结果可以得出许多结论。膜片覆盖内部混凝土截面积一半以上的CFT柱的长期变形量与在钢管的整个截面上同时施加载荷的情况下的长期变形量相同和内部的混凝土。隔膜限制了色谱柱端面的横向变形，其影响范围仅限于色谱柱的端部，这意味着它仅从表面限制到与CFT色谱柱宽度相同的深度。除了在膜片的影响范围内，不会发生沿纵轴的约束作用和应力变化。在仅在内部混凝土上施加载荷的情况下，内部混凝土被钢管限制在拐角处，并且随着时间的流逝，内部混凝土与钢管之间的滑动增加。

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