Performance of axially-loaded concrete-filled steel tubular circular columns using ultra-high strength concrete
Performance of axially-loaded concrete-filled steel tubular circular columns using ultra-high strength concrete
复制标题
超高强混凝土轴压钢管混凝土圆柱性能
DOI：
10.1016/j.istruc.2019.12.019
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发表时间：
2020-04-01
期刊：
影响因子：
4.1
通讯作者：
Xiang, Kai
中科院分区：
文献类型：
--
作者：
Song, Tian-Yi;Xiang, Kai
本文采用有限元方法研究了钢管超高强混凝土圆柱在轴压作用下的受力性能。通过对现有普通混凝土本构模型的修正，提出了一种新的钢管约束超高强混凝土本构模型。有限元计算结果与试验结果的对比表明，所提出的有限元模型能够准确地反映钢管混凝土柱中超高强混凝土的脆性特性。基于所提出的有限元模型，对钢管超高强混凝土轴心受压圆柱的受力性能进行了分析和讨论，包括荷载-变形关系、应力发展、约束效应和初步优化设计。最后，对超高强混凝土钢管混凝土轴心受压圆柱的荷载-变形曲线和强度利用指标进行了参数研究，分析了关键参数对超高强混凝土钢管混凝土轴心受压圆柱荷载-变形曲线和强度利用指标的影响。
Finite element analysis (FEA) is conducted to investigate the structural behaviour of axially-loaded ultra-high strength concrete (UHSC) filled steel tube circular columns in this paper. A new stress-strain model of UHSC confined by circular steel tube is proposed by recalibrating the existing normal strength concrete constitutive model. The comparison between FEA predictions and test results indicates that the proposed FEA model is able to capture the brittleness characteristic of UHSC in circular CFST columns accurately. Based on the proposed FEA model, the structural performance of axially-loaded UHSC filled steel tube circular columns, including load versus deformation relationship, stress development, confinement effect and preliminary optimized design, are analysed and discussed. Finally, a parametric study is conducted to investigate the influence of key parameters on the load-deformation curve and strength utilization index of axially-loaded UHSC filled steel tube circular column during the entire loading process.