Analytical behavior of concrete-filled aluminum tubular stub columns under axial compression
Analytical behavior of concrete-filled aluminum tubular stub columns under axial compression
复制标题
DOI：
10.1016/j.tws.2019.03.019
复制
发表时间：
2019-07-01
影响因子：
6.4
通讯作者：
Han, Lin-Hai
中科院分区：
文献类型：
--
作者：
Wang, Fa-Cheng;Zhao, Hua-Yang;Han, Lin-Hai
本文采用有限元方法研究了圆形铝管混凝土轴压短柱的受力性能。建立了考虑混凝土和铝合金材料非线性及相互作用的有限元模型。预测的极限强度，载荷-轴向应变关系和失效模式进行比较，从收集的实验数据。对荷载-变形N-T曲线进行了全过程分析，研究了铝管的多轴应力状态和铝管与混凝土芯柱的相互作用应力。验证后的有限元模型用于对关键材料和几何特性进行一系列参数化研究。研究了延性指数DI和极限强度应变ε（scy）。提出了确定圆形CFAT短柱截面刚度的计算公式。研究了现有钢管混凝土设计方法对钢管混凝土短柱的适用性。
This paper presents finite element investigations on the structural behaviors of circular concrete-filled aluminum tubular (CFAT) stub columns under axial compression. The finite element models are developed by considering the nonlinearities of concrete and aluminum materials and the interactions between the two components. The predicted ultimate strengths, load-axial strain relationships and failure modes are compared to those from collected experimental data. Full range analysis on the load-deformation N-epsilon are conducted, where the investigations on the multi-axial stress conditions of the aluminum tube and the interaction stress between the aluminum tube and concrete core are included. The verified finite element models are used to carry out a series of parametric studies on key material and geometric properties. The ductility index DI and strain at ultimate strength epsilon(scy) are studied. Equations to determine epsilon(scy) for circular CFAT stub columns are proposed. The applicability of the existing design method for CFST to CFAT stub columns is investigated.