A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Stability of steel columns with bolted strengthening under preload: Experimental study
Abstract Strengthening of steel columns is usually conducted with existing loads, so there is a need to study the effect of the preload (the existing load during strengthening) on the stability of strengthened columns. This study presents an experimental work, in which H-shaped steel columns were strengthened with bolted steel angles. Specimens strengthened under different preload levels were tested. The test results showed that the preload had an influence on column behaviors including deformations, strains, and stresses. In particular, the preload had an effect on the ultimate load capacity. The (normalized) ultimate load capacities of the specimens slightly increased and then decreased with the increasing preload. The effect of the preload on the ultimate load capacities was generally insignificant (no more than 8% in the study), and the effect could be either favorable or unfavorable depending on the case. This varying effect of the preload could be interpreted by the combined effects of the equivalent initial deformation and initial stresses. In addition, specimens with different steel angle properties, strengthening length ratios, and slenderness ratios were tested. The test results indicated that all these variables affected the behaviors and ultimate load capacities of the strengthened specimens.
Graphical abstracts Display Omitted
Highlights Strengthening of steel columns under different preload levels were studied. H-shaped steel columns strengthened by four bolted steel angles were experimentally tested. The behaviors of the strengthened column including deformations, strains, stresses were affected by the preload. The preload effect on the ultimate load capacity could be either favorable or unfavorable depending on the case. The preload effect was analyzed with an equivalent initial condition including initial deformation and initial stresses.
Stability of steel columns with bolted strengthening under preload: Experimental study
Abstract Strengthening of steel columns is usually conducted with existing loads, so there is a need to study the effect of the preload (the existing load during strengthening) on the stability of strengthened columns. This study presents an experimental work, in which H-shaped steel columns were strengthened with bolted steel angles. Specimens strengthened under different preload levels were tested. The test results showed that the preload had an influence on column behaviors including deformations, strains, and stresses. In particular, the preload had an effect on the ultimate load capacity. The (normalized) ultimate load capacities of the specimens slightly increased and then decreased with the increasing preload. The effect of the preload on the ultimate load capacities was generally insignificant (no more than 8% in the study), and the effect could be either favorable or unfavorable depending on the case. This varying effect of the preload could be interpreted by the combined effects of the equivalent initial deformation and initial stresses. In addition, specimens with different steel angle properties, strengthening length ratios, and slenderness ratios were tested. The test results indicated that all these variables affected the behaviors and ultimate load capacities of the strengthened specimens.
Graphical abstracts Display Omitted
Highlights Strengthening of steel columns under different preload levels were studied. H-shaped steel columns strengthened by four bolted steel angles were experimentally tested. The behaviors of the strengthened column including deformations, strains, stresses were affected by the preload. The preload effect on the ultimate load capacity could be either favorable or unfavorable depending on the case. The preload effect was analyzed with an equivalent initial condition including initial deformation and initial stresses.
Stability of steel columns with bolted strengthening under preload: Experimental study
Wang, Sizhe (author) / Su, Qingtian (author) / Jiang, Xu (author) / Ghafoori, Elyas (author)
2021-12-23
Article (Journal)
Electronic Resource
English
Stability , Buckling , Preload , Bolting , Strengthening , Compression test