Behavior of Splicing GFRP-Concrete-Steel Double-Skin Tubular Columns Subject to Eccentric Compression

• Published in: Arabian journal for science and engineering (2011) Vol. 47; no. 4; pp. 4955 - 4969
• Main Authors: Li, Xue, Wang, Lian-guang, Gao, Hai-yang, Zhang, Ni
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2022; Springer Nature B.V
• Subjects: Bearing capacity; Columns (structural); Compression loads; Compressive strength; Deflection; Ductility; Eccentric loads; Eccentricity; Engineering; Glass fiber reinforced plastics; Humanities and Social Sciences; Mathematical analysis; Mechanical properties; multidisciplinary; Research Article-Civil Engineering; Science; Splicing; Steel ratios; Stiffness; Ultimate loads; Steel bar connection; Splice member; Glass fiber-reinforced polymer (GFRP); Double-skin tubular columns (DSTCs); Eccentric compression load
• ISSN: 2193-567X; 1319-8025; 2191-4281
• DOI: 10.1007/s13369-021-06335-7

This paper designs the splicing GFRP-concrete-steel double-skin tubular column (DSTC) specimens based on steel bar connection, and the mechanical performance under eccentric compression load is investigated. The test parameters include the axial connection steel ratio, the load eccentricity and the hollow ratio. The results show that the splicing DSTCs present ductile failure under eccentric load, with the average deflection ductility coefficient of 4.21 and the axial shortening of more than 2% of the column height. The arranged connection steel cage prevents the joint failure, and the columns fail at the non-joint section, characterized by hoop rupture of the GFRP tube and concrete crushing at the same position. The proposed splice method satisfies the strength requirements, with more than 20% increase in the ultimate load compared with the continuous specimen, while the bearing capacity dose not increase with the increase of the axial connection steel ratio. Thus, it is suggested that the low axial steel ratio of 2.44% is used for the splicing DSTCs under relative small eccentricity (20 mm). The ultimate load decreases by about 25% with every 20 mm increase in load eccentricity, and the 40 mm eccentricity causes almost 50% reduction in the initial stiffness and doubles the lateral deflection compared with the axial compression member. The increase of hollow ratio decreases the ultimate load, the initial axial stiffness and also the ductility of the column. The theoretical calculation method for predicting the bearing capacity of the splicing DSTCs is experimentally verified.