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Compressive behaviour of circular CFDST short columns with high- and ultrahigh-strength concrete
Thin-Walled Structures ( IF 5.7 ) Pub Date : 2021-05-06 , DOI: 10.1016/j.tws.2021.107898
Xi-Feng Yan , Yan-Gang Zhao , Siqi Lin

Concrete-filled double-skin steel tubular (CFDST) columns possess lower self-weight, higher ductility and energy absorption than conventional concrete-filled steel tubular (CFST) ones. The use of high-strength concrete (HSC) can further enhance their advantages, such as greater mechanical and economical benefits. However, there is little information on the structural performance of CFDST columns with HSC, especially ones with ultrahigh-strength concrete (UHSC). In this paper, a comprehensive experimental program consisted of 24 specimens was carried out to investigate the compressive behaviour of circular CFDST short columns with HSC and UHSC. The test results show that CFDST columns with higher strength concrete generally achieve higher initial stiffness and axial strengths but lower ductility. Additionally, the axial strengths of CFDST columns are improved as the yield stress and wall thickness of the outer steel tubes increase and as the hollow ratio decreases. A finite element (FE) model was established and verified against the present test results, based on which the interaction of the steel tubes and concrete and the load distribution on components were analysed. A parametric study using the verified FE model was conducted to further ascertain the influences of column variables on the compressive behaviour of the studied CFDST columns. Finally, the applicability of the existing design codes and empirical models to design the CFDST columns was evaluated based on the test results in the present and previous studies. It is shown that European code EN 199411 (EC4) achieves better strength predictions than other design models.



中文翻译:

高和超高强度混凝土圆形CFDST短柱的抗压性能

与传统的钢管混凝土(CFST)相比,钢管混凝土(CFDST)柱具有更低的自重,更高的延展性和能量吸收。使用高强度混凝土(HSC)可以进一步增强其优势,例如更大的机械和经济效益。但是,关于带有HSC的CFDST柱的结构性能,尤其是具有超高强度混凝土(UHSC)的CFDST柱的结构性能的信息很少。本文研究了由24个试样组成的综合实验程序,以研究圆形CFDST短柱在HSC和UHSC的压缩性能。试验结果表明,采用高强度混凝土的CFDST柱通常具有较高的初始刚度和轴向强度,但延展性较低。此外,CFDST柱的轴向强度随着外钢管的屈服应力和壁厚的增加以及空心率的减小而提高。建立了有限元(FE)模型,并根据当前的测试结果进行了验证,在此模型的基础上,分析了钢管与混凝土的相互作用以及构件上的载荷分布。使用已验证的有限元模型进行了参数研究,以进一步确定柱变量对所研究的CFDST柱的抗压性能的影响。最后,根据当前和先前研究的测试结果,评估了现有设计规范和经验模型设计CFDST色谱柱的适用性。显示欧洲代码EN 建立了有限元(FE)模型,并根据当前的测试结果进行了验证,在此模型的基础上,分析了钢管与混凝土的相互作用以及构件上的载荷分布。使用已验证的有限元模型进行了参数研究,以进一步确定柱变量对所研究的CFDST柱的抗压性能的影响。最后,根据当前和先前研究的测试结果,评估了现有设计规范和经验模型设计CFDST色谱柱的适用性。显示欧洲代码EN 建立了有限元(FE)模型,并根据当前的测试结果进行了验证,在此模型的基础上,分析了钢管与混凝土的相互作用以及构件上的载荷分布。使用已验证的有限元模型进行了参数研究,以进一步确定柱变量对所研究的CFDST柱的抗压性能的影响。最后,根据当前和先前研究的测试结果,评估了现有设计规范和经验模型设计CFDST色谱柱的适用性。显示欧洲代码EN 使用已验证的有限元模型进行了参数研究,以进一步确定柱变量对所研究的CFDST柱的抗压性能的影响。最后,根据当前和先前研究的测试结果,评估了现有设计规范和经验模型设计CFDST色谱柱的适用性。显示欧洲代码EN 使用已验证的有限元模型进行了参数研究,以进一步确定柱变量对所研究的CFDST柱的抗压性能的影响。最后,根据当前和先前研究的测试结果,评估了现有设计规范和经验模型设计CFDST色谱柱的适用性。显示欧洲代码EN1994年-1个-1个 (EC4)可以比其他设计模型实现更好的强度预测。

更新日期:2021-05-06
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