Compressive response of substandard steel-jacketed RC columns strengthened under sustained service loads: From the local to the global behavior. (10th August 2018)

• Record Type: Journal Article
• Authors: Ferrotto, M.F.; Cavaleri, L.; Papia, M.
• Is Part Of: Construction & building materials. Volume 179(2018)
• Page Start: 500
• Page End: 511
• Publication Date: 2018-08-10
• Subjects: Preloading -- Confinement -- Confined concrete -- Steel jacketing -- Confinement lateral pressure -- Sustained loads; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.05.247
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Behavior of concrete columns subjected to preload before wrapping by steel cages is presented. An experimental study is carried out on columns strengthened under different levels of sustained loads. Experimental and analytical results indicate the preload affects the compressive response. Abstract: This paper presents an experimental investigation on substandard partially steel jacketed RC columns strengthened under sustained loads and loaded until failure. The aim of the study is to compare the compressive response of preloaded columns with respect to the tests without preload to obtain a more realistic prediction of load-carrying capacity of structural columns after retrofitting under serviceability loads. The influence of the preload level, the delayed contribution of the confining device during the loading process and the time dependent effects are highlighted for the tested specimens. Based on the experimental observations, an analysis-oriented model is proposed for the reproduction of the compressive response of steel jacketed columns taking into account the effects of the preload.