Compressive behaviour of concrete elements confined with GFRP-prefabricated bonded shells

Abstract

In this paper, a new technique is proposed to confine concrete columns using GFRPprefabricated bonded shells and a shrinkage-compensating cement mortar. The confinement is performed with three identical shells, each of which contains two stepped lap joints at their ends. The main advantage of this technique is that the shells can be directly assembled on site by structural bonding to cover any column shape. The gap between the shells and the column is filled with shrinkage-compensating cement mortar. To evaluate the efficiency of this technique, several concrete specimens were confined, instrumented and tested under monotonic compression. To simulate the actual strengthening conditions, the load was directly applied on the concrete crosssection. The results show clearly the benefits of an efficient confinement in terms of a noticeable increase in the axial strength and ductility where the stress-strain curves are characterised by a third softening phase and the failure mode which spread over the whole length of the shells.

Comparison of Flexural Properties of Pinewood With Fea Simulation for Marine Application

“…Moreover, the jackets are heavy and spread across the concrete and steel, adding weight to the repaired structures, and causing seismic occurrences to attract greater loads as separated components improve their strength [8]. It is also difficult, labor-intensive, and costly to implement these old underwater repair solutions.…”

Structural applications of fibre reinforced polymer (FRP) composite tubes: A review of columns members

“…The degree of improvement in the axial strength and strain capacities of concrete columns due to the confinement with FRP materials depends on many parameters such as slenderness ratio of columns, shape of cross-section, concrete strength, method used to manufacture the tube, fibre properties, fibre orientation and FRP thickness [9].…”

“…Beddiar et al [9] improved the first method by assembling three GFRP sheets made from twill weave glass with structural bending to modify the cross section of square concrete columns and then, filled the gap with shrinkage compensating cement mortar ( Figure 2). The test results confirmed that strength and ductility capacities of noncircular concrete sections can be improved through cross section modifications.…”