Structural response of concrete-filled elliptical steel hollow sections under eccentric compression
Structural response of concrete-filled elliptical steel hollow sections under eccentric compression
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DOI：
10.1016/j.engstruct.2012.06.040
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发表时间：
2012-12
影响因子：
5.5
通讯作者：
Therese Sheehan;X. Dai;T. Chan;D. Lam
中科院分区：
文献类型：
--
作者：
Therese Sheehan;X. Dai;T. Chan;D. Lam
本研究的目的是研究椭圆形钢管混凝土短柱在轴力和弯矩组合作用下的性能。迄今为止，大多数涉及混凝土钢型材的研究都集中在圆形和矩形管上，每种形状都表现出不同的行为。空心型材墙提供的混凝土限制程度已在纯压缩下进行了研究，但对于压缩和弯曲载荷组合仍然不明确，目前没有针对这种载荷组合的设计规定。为了探索结构性能，使用两种不同管壁厚度的八个短柱并在不同偏心率下施加轴向压缩进行了实验室测试。为每个样本生成力矩-旋转关系，以确定横截面尺寸和弯曲轴线对总体响应的影响。开发了完整的 3D 有限元模型，比较不同材料本构模型的效果，直到找到良好的一致性。最后，假设塑性行为生成分析相互作用曲线，并与实验和有限元结果进行比较。这些测试提供的基础工作为会员层面未来设计指南的制定铺平了道路。
The purpose of this research is to examine the behaviour of elliptical concrete-filled steel tubular stub columns under a combination of axial force and bending moment. Most of the research carried out to date involving concrete-filled steel sections has focussed on circular and rectangular tubes, with each shape exhibiting distinct behaviour. The degree of concrete confinement provided by the hollow section wall has been studied under pure compression but remains ambiguous for combined compressive and bending loads, with no current design provision for this loading combination. To explore the structural behaviour, laboratory tests were carried out using eight stub columns of two different tube wall thicknesses and applying axial compression under various eccentricities. Moment-rotation relationships were produced for each specimen to establish the influence of cross-section dimension and axis of bending on overall response. Full 3D finite element models were developed, comparing the effect of different material constitutive models, until good agreement was found. Finally, analytical interaction curves were generated assuming plastic behaviour and compared with the experimental and finite element results. Ground work provided from these tests paves the way for the development of future design guidelines on the member level.