纤维增强混凝土填充钢管柱的研究进展

Zhenzhen Liu, Xiaoxia Ma, Na Li, Juan Chen, Yiyan Lu
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引用次数: 0

摘要

摘要纤维增强混凝土填充钢管(CFST)采用了纤维的微骨架和架桥效应,从而优化了钢管与混凝土芯之间的约束效果,同时降低了混凝土芯的易碎性。这种结构为解决传统 CFST 的界面脱离和延性不足问题提供了可行的解决方案。为了进一步开展理论研究和工程应用,本文综述了纤维增强 CFST 在不同加载条件下的力学性能。总结了研究成果,并提出了未来的研究方向。文献综述表明,添加纤维可显著提高 CFST 的延性,但承载能力仅略有提高。纤维增强了钢管与混凝土芯之间的粘结强度,同时延缓了粘结强度的下降。然而,现有研究在力学性能和设计方法方面仍存在不足。应开展更多的实验工作、进一步的理论分析和数值模拟,以建立广义纤维参数与 CFST 结构性能之间的定量关系。未来的研究应根据使用性能要求,提出纤维增强 CFST 结构的统一设计理论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research advances in fiber‐reinforced concrete‐filled steel tube columns
SummaryFiber‐reinforced concrete‐filled steel tube (CFST) adopts the microskeleton and bridging effect of fibers, thereby optimizing the confinement effect between the steel tube and concrete core while reducing the concrete core friability. This structure offers a viable solution for solving the interface disengagement and insufficient ductility problems of conventional CFSTs. For further theoretical research and engineering application, the mechanical properties of fiber‐reinforced CFSTs under different loading conditions are reviewed. The research results are summarized, and future research scopes are suggested. The literature review shows that adding fibers improves the ductility of CFSTs significantly but the bearing capacity only slightly. The bond strength between steel tube and concrete core is enhanced by fibers, and the degradation in the bond strength is simultaneously delayed. However, in existing research, the mechanical properties and design method are still inadequate. More experimental works, further theoretical analyses, and numerical simulation should be undertaken to establish the quantitative relations between the generalized fiber parameters and structural performance of CFSTs. Future research should propose a unified design theory of fiber‐reinforced CFST structures based on service performance requirements.
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