Experimental study on axial compressive behavior of full-scale masonry columns strengthened with reinforced high ductile concrete (RHDC). (1st February 2022)

• Record Type: Journal Article
• Authors: Li, Tong; Deng, Mingke; Jin, Mengna; Zhang, Yangxi
• Is Part Of: Engineering structures. Volume 252(2022)
• Publication Date: 2022-02-01
• Subjects: Full-scale masonry column -- High ductile concrete (HDC) -- Composite column -- Strength -- Initial stress; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2021.113650
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Twelve full-scale masonry columns were tested under concentric axial loading. The strengthening efficiency of RHDC on the axial behavior of masonry columns was studied. RHDC improved the strength and deformation of full-scale columns. The effect of initial vertical load on the strengthening efficiency was analyzed theoretically. Abstract: The present paper demonstrates the results of an experimental study on full-scale masonry columns strengthened with reinforced high ductile concrete (RHDC) system. This technique can be applied for existing masonry structures as a strengthening technique or for new construction as RHDC-masonry composite columns. Three unreinforced masonry (URM) columns and nine RHDC-strengthened columns were prepared and subjected to concentric axial loads. Each column had a rectangular cross-section and a heigh of 2400 mm. The variables considered in the tests were different configurations of RHDC system. The axial behavior of full-scale columns was discussed and analyzed including modes of failure, axial load-deformation response, peak load, and deformation capacity. Overall, the failure mode of columns was improved by RHDC system, preventing masonry from seriously crushing. Moreover, RHDC system increased both axial capacity and corresponding displacement of full-scale masonry columns, with maximum increases of 168% and 34%, respectively. Due to the enhanced stiffness and cross-sectional area of columns, the results from the current investigation allowed using a stability coefficient higher than that of URM structures for the prediction of the axial capacity of RHDC-strengthened columns. Finally, the effect of initial masonry strength and vertical stress on the load-bearing capacity of columns was analyzed theoretically. The strength reduction coefficient of HDC obtained from analysis can be used in engineering.