Seismic behavior of concrete-filled steel tube columns strengthened with CFRP grid and ECC

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-09-20 DOI:10.1016/j.tws.2025.114012

Yuhong Yan, Pengpeng Wang, Dong Zhao, Zhenzhen Liu, Yiyan Lu

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Abstract

This study presents an investigation aim at evaluating the seismic behavior of concrete-filled steel tube (CFST) columns strengthened with carbon fiber-reinforced polymer (CFRP) grid and engineered cementitious composite (ECC). Ten specimens were fabricated and tested under combined constant axial loads and cyclic lateral loads. The effects of the number of CFRP grid layers, diameter-to-thickness ratio of the steel tube, infilled concrete strength, and axial load ratio on the seismic behavior of the strengthened columns were analyzed. The results indicated that the strengthened columns exhibited ductile failure. The CFRP grid and ECC layer significantly prevented the local buckling of the steel tube. Although steel tube deformation at the plastic hinge region was minimal, the crushing of the infilled concrete demonstrated efficient utilization of material strength. After strengthening, the hysteretic curve of the columns became fuller, with lateral load-bearing capacity enhancements ranging from 16.7 % to 32.3 % and energy dissipation capacity increasing by 58.6 %. Increasing the number of CFRP grid layers improved the lateral load-bearing capacity of the strengthened columns but reduced ductility due to more brittle rupture of CFRP. When the axial load ratio was below 0.30, its increase slightly enhanced lateral load-bearing and energy dissipation capacities. However, as the axial load ratio reached 0.45, lateral load-bearing capacity, ductility, and energy dissipation capacity significantly decreased. Considering the confining effects of both the strengthening layer and steel tube on the concrete core, a prediction model for the skeleton curves of the strengthened columns was developed.

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CFRP格栅和ECC加固钢管混凝土柱的抗震性能

本研究旨在评估碳纤维增强聚合物（CFRP）网格和工程胶凝复合材料（ECC）加固钢管混凝土（CFST）柱的抗震性能。制作了10个试件，在恒定轴向载荷和循环侧向载荷联合作用下进行了试验。分析了碳纤维布网格层数、钢管径厚比、填充混凝土强度和轴向荷载比对加固柱抗震性能的影响。结果表明，加固后的柱表现为延性破坏。CFRP格栅和ECC层对钢管的局部屈曲有明显的抑制作用。塑性铰区钢管变形很小，但对混凝土的破坏是材料强度的有效利用。加固后柱的滞回曲线更加饱满，横向承载力提高16.7% ~ 32.3%，耗能能力提高58.6%。增加碳纤维布网格层数提高了加固柱的横向承载能力，但由于碳纤维布脆性断裂的增加而降低了延性。当轴向载荷比小于0.30时，轴向载荷比的增大使其侧向承载能力和耗能能力略有增强。但当轴向载荷比达到0.45时，横向承载能力、延性和耗能能力显著降低。考虑加固层和钢管对混凝土核心的围合作用，建立了加固柱骨架曲线的预测模型。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.