Finite element analysis of concrete‐encased columns reinforced with multiple steel sections

Lianjin Bao, Guoqiang Li, Feng Fan, Hang Zhao, Gang Huang, Jianyun Sun, Feifei Sun
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Abstract

SummaryConcrete‐encased columns reinforced with one built‐up steel core are widely used as mega columns in high‐rise buildings. Due to the enormous size of the steel core, multiple steel segments have to be welded and spliced on‐site, which might inflict detrimental impacts on the integrity and ductility of the columns. To solve this practical issue, one method using multiple steel sections to replace one gigantic built‐up section is proposed. However, whether those columns reinforced with individual steel sections could have the same capacity as the ones reinforced with one steel core and whether the current design method relying on strain compatibility is still applicable to design such columns remain unknown. In this study, one column specimen reinforced with multiple steel sections is tested and the test results are utilized to calibrate finite element models. Afterward, finite element (FE) analysis is performed on concrete‐encased columns reinforced with multiple steel sections to numerically examine the load capacity of those columns. Based on the numerical analysis, a design method based on modified strain distribution is proposed. Numerical results indicate that concrete‐encased columns reinforced with multiple steel sections exhibit similar performance compared with the one reinforced with one steel core, showing great potential to be applied as mega columns in high‐rise buildings.
多节钢筋混凝土包裹柱的有限元分析
摘要在高层建筑中,用一个内置钢芯加固的混凝土包裹柱子被广泛用作超大型柱子。由于钢芯体积巨大,必须在现场焊接和拼接多个钢段,这可能会对柱子的整体性和延展性造成不利影响。为了解决这一实际问题,有人提出了一种方法,即用多个钢段来替代一个巨大的加固段。然而,使用单个钢截面加固的柱子是否能与使用一个钢芯加固的柱子具有相同的承载能力,以及当前依靠应变相容性的设计方法是否仍适用于设计此类柱子,这些问题仍然是未知数。在本研究中,我们测试了用多个钢截面加固的支柱试样,并利用测试结果校准了有限元模型。随后,对采用多钢截面加固的混凝土包裹柱进行了有限元(FE)分析,对这些柱子的承载能力进行了数值检验。在数值分析的基础上,提出了一种基于修正应变分布的设计方法。数值结果表明,采用多截面钢筋加固的混凝土包裹柱与采用单一钢芯加固的混凝土包裹柱性能相似,显示出作为超大型柱应用于高层建筑的巨大潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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