A large experimental research programme has investigated the flexural strength of simply supported reinforced concrete beams. The beams were first damaged so that they could be strengthened by means of jackets (cast-inplace shotcrete or pre-packed special mortar plus additional new reinforcement). This paper analyses the flexural strength of'these beams. The behaviour in service and ultimate state as well as the bond characteristics are studied.
RESUME
Au cours d'un vaste programme exp&imental, on a (tudid la r&istance en JTexion de poutres en b(ton armd
A large experimental programme was developed to study the behaviour of shear-strengthened, simplysupported reinforced concrete beams.This paper presents the shear strength of these beams by combining new reinforcement and shotcrete or pre-packed mortar jackets.The behaviour in service and ultimate state, along with bond aspects, are taken into consideration.Three different types of strengthening stirrups were tested.
RI~SUMI~
The installation of new reinforcing bars onto an existing structure is a common practice in civil construction both for old and new structures. The use of anchors has been extensively studied and normalized. The placement of steel reinforcement bars in holes filled with epoxy resin, despite their wide use, still lacks a satisfactory methodology for the design of such systems. In this context, the aim of this paper is to present the results of an experimental programme for confined pullout tests, comparing the performance of cast steel reinforcement bars to that of bars bonded to concrete with epoxy resin. The investigated test parameters included the bar diameter, the embedment length and the resin thickness. Tests results showed a significant efficiency of epoxy resin as structural bonding agent and allowed the verification of sizeable reduction in the anchorage lengths for bonded bars.
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