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Seismic behavior of dumb-bell steel tube confined reinforced concrete piers
Highlights Dumb-bell steel tube improves the seismic behavior of the RC pier. A model was proposed to predict DSTCRC bearing capacity.
Abstract To improve the strength and ductility of short reinforced concrete (RC) piers, dumb-bell steel tube confined reinforced concrete (DSTCRC) piers were proposed and studied, in which the dumb-bell steel tube is disconnected at the foundation and cap beam to avoid the difficulty of inserting steel tubes into RC members. In this paper, five DSTCRC piers and one reference dumb-bell RC pier were tested under pseudo-static loading. The test parameters included shear span-depth ratio (1.25 and 1.75), axial load ratio (0.12 and 0.24), and width of the web (75 mm and 100 mm). Because of the confinement and enhancement effect from the dumb-bell steel tube, failure modes of RC piers changed from shear failure to bending failure, and the strength, ductility, and energy dissipation capacity significantly improved. The seismic performance of DSTCRC piers improved slightly with the increasing axial load ratio and width of the web within the scope of this study. Shear failure of the concrete in the web cavity exhibited in DSTCRC specimens with a shear span-depth ratio of 1.25, but the lateral resistance increased by approximately 90% as the shear span-depth ratio decreased from 1.75 to 1.25 despite slight drops of the ductility ratio and ultimate displacement ratio. A simplified model considering the bending of RC cores and shear of steel webs and concrete web was proposed to predict the lateral resistance of DSTCRC piers, and the predicted results showed a good agreement with the test results.
Seismic behavior of dumb-bell steel tube confined reinforced concrete piers
Highlights Dumb-bell steel tube improves the seismic behavior of the RC pier. A model was proposed to predict DSTCRC bearing capacity.
Abstract To improve the strength and ductility of short reinforced concrete (RC) piers, dumb-bell steel tube confined reinforced concrete (DSTCRC) piers were proposed and studied, in which the dumb-bell steel tube is disconnected at the foundation and cap beam to avoid the difficulty of inserting steel tubes into RC members. In this paper, five DSTCRC piers and one reference dumb-bell RC pier were tested under pseudo-static loading. The test parameters included shear span-depth ratio (1.25 and 1.75), axial load ratio (0.12 and 0.24), and width of the web (75 mm and 100 mm). Because of the confinement and enhancement effect from the dumb-bell steel tube, failure modes of RC piers changed from shear failure to bending failure, and the strength, ductility, and energy dissipation capacity significantly improved. The seismic performance of DSTCRC piers improved slightly with the increasing axial load ratio and width of the web within the scope of this study. Shear failure of the concrete in the web cavity exhibited in DSTCRC specimens with a shear span-depth ratio of 1.25, but the lateral resistance increased by approximately 90% as the shear span-depth ratio decreased from 1.75 to 1.25 despite slight drops of the ductility ratio and ultimate displacement ratio. A simplified model considering the bending of RC cores and shear of steel webs and concrete web was proposed to predict the lateral resistance of DSTCRC piers, and the predicted results showed a good agreement with the test results.
Seismic behavior of dumb-bell steel tube confined reinforced concrete piers
Zhou, Xuhong (Autor:in) / Wang, Haicui (Autor:in) / Wang, Xuanding (Autor:in) / Liu, Jiepeng (Autor:in)
Engineering Structures ; 206
19.12.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch