Abstract
Reinforced concrete (RC) columns cannot get supreme confinement by using the customary steel stirrups reinforcement because of the requirements for the spacing distances between the stirrups in addition to concrete continuance trouble. For this, Steel Mesh (SM) externally wrapped around the outer perimeter of the column as contributory confinement are being widely used due to its features. Limited tests focused on using SM for the internal confinement around the reinforcing cage of RC columns. Moreover, no experimental comparison was presented between RC columns internally and externally confined using SM. This paper investigates experimentally the behavior of circular RC columns confined internally or externally by SM. Six short RC columns have been subjected to axial loading until failure. The main studied parameters were SM schemes, number of SM wraps, SM position (internally or externally), and the steel stirrups existence. Results demonstrated that SM could decrease the crack opening, diminish the concrete spalling, increase the maximum failure load, and enhance the ductility, energy absorption, and column stiffness. Furthermore, the partially internal confinement using two wraps of SM around the steel ties presented the maximum capacity with reasonable ductility. In general, internally confined columns showed better behavior than the externally confined one.
Highlights
N umerous strategies of the bending retrofitting for reinforced concrete (RC) elements were presented, such as bonded high strength fiber reinforced-polymer (FRP) sheets and steel plates on the outside of the concrete, and near-surface mounted (NSM) reinforcement using FRP or steel bars [1,2,3,4,5,6]
The results proved that the Steel Wire Mesh (SWM) has a mightily effective repair technique for RC columns that have insufficient lap splices under earthquake load, where the peak load, flexural strength, energy dispersion, stiffness, and the displacement ductility of the rehabilitated columns were larger than those of the unrepaired columns
This paper presented an experimental test to evaluate the behavior of circular RC columns that were confined internally or externally using steel mesh (SM)
Summary
N umerous strategies of the bending retrofitting for reinforced concrete (RC) elements were presented, such as bonded high strength fiber reinforced-polymer (FRP) sheets and steel plates on the outside of the concrete, and near-surface mounted (NSM) reinforcement using FRP or steel bars [1,2,3,4,5,6]. Abo-Alanwar [20] suggested a new procedure to strengthen twenty-one rectangular RC columns under the effect of eccentric compression represented in using various dimensions of steel plates and/or steel angles wrapped with SWM at the outer compression side The results of this strengthening procedure showed that augmentation of the dimensions of steel plates and steel angles leads to a high increase in the maximum capacity and remarkable amelioration in the ductility for the retrofitted columns. Marthong et al [24] presented an experimental test on various column forms represented in rectangular, square, circular, and polygon shapes confined using SWM under the effect of axial loading The findings of this test showed a noticeable increase in ultimate load, displacement ductility, stiffness, energy dissipation, and deformation in all wrapped columns compared to their control columns. The parameters influence in terms of mode of failure and crack pattern, load-vertical shortening curve, maximum load, ductility index, the capacity of energy absorption, and the stiffness were studied
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