Parametric Analysis of the Models of Confinement of the Concrete Column

Abstract

Existing models for the concrete confined show a great respect in terms of effectiveness of confinement. The concrete confinement which consists in preventing these strains can be carried out either by an external envelope, or by a weak spacing between the stirrups. All models consist of some modification factors multiplying the unconfined concrete properties; these modification factors depend on the strength ratio and the confinement level. The relation of the ultimate strength ‘and ultimate strain in many existing models is complexity by representing. Each author gauges his model according to the experimental data. In this study, we present the results of a parametric analysis of some the most used models of confinement. The results show that the models of confinement have an important disparity between the values of the strength (fCC) and axial ultimate strain (εcc) of confined concrete.

Experimental and statistical investigation of a new concrete-composite beam with encased polymer tube wrapped by FRP

“…The concrete-composite beam weight was reduced by 20%, which can be transformed in additional dead loads. This weight reduction leads to an increasing in ductility and a reduction of the seismic stresses, which is very important for safety reasons because this cover plays the role of an alarm before overall collapse, and hence the building evacuation can be possible to save human fatalities [2]. Table 3 presents the details of average and standard deviation of test results, namely: crack initiation loads, ultimate loads, mid-span deflection at crack initiation and ultimate loads.…”

“…The safety margin of the concrete-composite beam is canceled when the crack opening exceeds the limit state defined by the limit state function given in Eq. (2), in which X is the realization of the random variables vector. When the ultimate limit state is achieved, the failure will occur when the resisting load M R equals the acting load M S , in other words, when the safety margin goes to zero.…”

“…These innovative materials have found their new applications in the rehabilitation and the strengthening of reinforced concrete members. The enhancement of mechanical performances of concrete members strengthened with composite materials was experimentally demonstrated by several authors [1][2][3][4][5][6][7][8][9] and several approaches for reinforced and confined concrete structures by FRP composites have been developed. One of the most used strengthening methods was the bonding of external composite plates on the exposed faces to failure.…”