The Effects of Discrete Steel Collar Retrofitting on Lap Splices in Square Concrete Column
Dr. Driver, Dr. Tomlinson
In retrofitting technique research, the lap splices in columns are often not considered in much detail as the focus is usually on the overall capacity change created by the retrofitting. Brittney’s research aims to gather experimental data on the effects discrete steel collar retrofitting has on concrete column lap splices. Her experimental test program will test splices both under compression and tension loading and with varying levels of additional confinement. Fourteen 300 x 300 mm rectangular concrete columns that are two metres in length will be constructed. Parameters manipulated include the arrangement of discrete steel retrofitting collars, 2 splice lengths, as well as 2 test eccentricities (concentric and 125 mm). In order to compare the spliced specimens to a continuous and fully development bars, two reference specimens will be tested. The columns internal detailing will include both tension Class A and compression splices as set by the A23.3-19. The splices will be instrumented with strain gauges at both ends of the splice and on both the bent and straight bars. The results of the experiments aim to indicate how the additional confinement provided from retrofitting increases the strength and strain capacity of the splice under ultimate loads.