Yuhong Yan, Pengpeng Wang, Dong Zhao, Zhenzhen Liu, Yiyan Lu
{"title":"CFRP格栅和ECC加固钢管混凝土柱的抗震性能","authors":"Yuhong Yan, Pengpeng Wang, Dong Zhao, Zhenzhen Liu, Yiyan Lu","doi":"10.1016/j.tws.2025.114012","DOIUrl":null,"url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 114012"},"PeriodicalIF":6.6000,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Seismic behavior of concrete-filled steel tube columns strengthened with CFRP grid and ECC\",\"authors\":\"Yuhong Yan, Pengpeng Wang, Dong Zhao, Zhenzhen Liu, Yiyan Lu\",\"doi\":\"10.1016/j.tws.2025.114012\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>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.</div></div>\",\"PeriodicalId\":49435,\"journal\":{\"name\":\"Thin-Walled Structures\",\"volume\":\"218 \",\"pages\":\"Article 114012\"},\"PeriodicalIF\":6.6000,\"publicationDate\":\"2025-09-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Thin-Walled Structures\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0263823125011012\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CIVIL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thin-Walled Structures","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0263823125011012","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
Seismic behavior of concrete-filled steel tube columns strengthened with CFRP grid and ECC
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.
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.