Cheng Baoquan, Wang Weichen, Li Junhua, Huang Jianling, Chen Huihua
School of Civil Engineering, Central South University, Changsha 410083, China.
School of Civil Engineering and Geographical Environment, Ningbo University, Ningbo 315211, China.
Materials (Basel). 2023 Jul 6;16(13):4860. doi: 10.3390/ma16134860.
In the realm of civil engineering, ultra-high-performance concrete-filled steel tube composite columns (UCFSTCs) constitute a new type of building material and structure, exhibiting high compressive strength and commendable durability. Given their promising characteristics, the prospects of their application are highly promising and are worthy of further exploration. However, current research has primarily focused on scaled-down specimens, thereby limiting a broader understanding of UCFSTCs' full-scale mechanical properties in real-world scenarios. This study aimed to investigate the mechanical properties of full-scale UHPC-filled steel tube composite columns (FUCFSTCs) in practical engineering applications. With the steel tube strength, steel tube thickness, concrete strength, aspect ratio, and steel tube diameter used as design parameters and the finite element software ABAQUS as the analytical tool, a total of 21 FUCFSTCs were designed and analyzed. Through a comparison with experimental curves, the rationality of both the material constitutive model and finite element model was verified, and the maximum error was 6.54%. Furthermore, this study analyzed the influence of different design parameters on FUCFSTCs' ultimate bearing capacity, ductility coefficient, and the stress-strain relationship of their concrete. The ductility coefficient remained around 1.3, and the cross-sectional size had the greatest impact on the bearing capacity of the composite column, with a maximum increase of 145.90%. Additionally, this paper provides an in-depth analysis of FUCFSTCs' mechanical behavior, failure mode, and stress process under an axial load. In conclusion, this research proposes an axial compression limit bearing capacity formula for FUCFSTCs via statistical regression, with a maximum error of 3.04%, meeting engineering accuracy requirements. Consequently, this study lays a strong foundation for the future application of FUCFSTCs in practical engineering.
在土木工程领域，超高性能钢管混凝土组合柱（UCFSTC）是一种新型的建筑材料和结构，具有较高的抗压强度和良好的耐久性。鉴于其优良特性，其应用前景十分广阔，值得进一步探索。然而，目前的研究主要集中在缩尺试件上，从而限制了对UCFSTC在实际工程场景中全尺寸力学性能的更全面理解。本研究旨在探讨全尺寸超高性能钢管混凝土组合柱（FUCFSTC）在实际工程应用中的力学性能。以钢管强度、钢管厚度、混凝土强度、长细比和钢管直径作为设计参数，采用有限元软件ABAQUS作为分析工具，共设计并分析了21根FUCFSTC。通过与试验曲线对比，验证了材料本构模型和有限元模型的合理性，最大误差为6.54%。此外，本研究分析了不同设计参数对FUCFSTC极限承载力、延性系数及其混凝土应力-应变关系的影响。延性系数保持在1.3左右，截面尺寸对组合柱承载力影响最大，最大增幅为145.90%。此外，本文深入分析了FUCFSTC在轴向荷载作用下的力学行为、破坏模式和应力过程。总之，本研究通过统计回归提出了FUCFSTC的轴向受压极限承载力公式，最大误差为3.04%，满足工程精度要求。因此，本研究为FUCFSTC在实际工程中的未来应用奠定了坚实基础。
