Structural Performance of Damaged Open-Web Type Src Beam-Columns With Bolt-Connected Batten Steel Plates After Retrofitting

Abstract eng:
The structural performance of damaged open-web type of steel encased reinforced concrete (SRC) beam-columns with bolt- connected batten steel plates after retrofitting was experimentally investigated. The experimental parameters are axial load ratio, shear span ratio, and the maximum tip displacement of the columns during the initial loading. First, each column was cyclically loaded to the targeted displacement. Subsequently, the test columns were retrofitted and reloaded. The damaged portions of each column were retrofitted with the polymer cement mortar, and the epoxy resin was injected into the cracks. Experimental results indicated that the measured stiffness of retrofitted columns was lower than the initial ones while the experienced displacements in each column were different. The lower stiffness might be attributed to deterioration of the concrete rigidity, low rigidity of the resin, and imperfect injection of the resin. Test results also indicate the column which experienced the larger displacement and higher axial load showed lower load carrying capacity, but the others showed approximately equal capacities to those of the initial columns. The lower load carrying capacity of the column resulted from buckling of the longitudinal reinforcements. The crack width was measured to assess the relation of crack width and the experienced drift ratio. These are valuable to predict the degree of damage from the crack width after an earthquake. Numerical analyses were also conducted to explain the retrofitted column behavior. The effect of strain hysteresis of concrete at first loading was considered for the behavior at second loading. Results predicted the experimental behaviors fairly well, which implies the validity of the analytical methods presented in this paper for evaluating the structural performance of retrofitted SRC columns in low axial load.

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