Effect of in-service strengthening on the axial load carrying capacity of steel box columns

Stability of steel columns with bolted strengthening under preload: Experimental study

“…The investigations of columns failing through flexural buckling [38,39] indicated that the ultimate load capacity of steel columns strengthened under load was decreased by the preload but only slightly. Erfani et al [40] conducted a numerical study on box-section steel columns reinforced with welded plates, and the study demonstrated that the ultimate load capacity of reinforced columns decreased with increasing preload, and this decrease was more apparent for the columns with median slenderness. Guo et al [41] conducted an experimental and numerical investigation on steel angles reinforced through welding and suggested that the effect of the preload was negligible when the stress caused by the preload was less than 0.4𝑓 𝑦 .…”