Abstract
This paper reports on an experimental study examining reinforced concrete beams without stirrups strengthened with Near Surface Mounted (NSM) steel bars. The beams were simply supported and were subjected to four point bending load. Three beams tested were designed as control specimens and the other six beams were strengthened with NSM steel bars. Three ratios of longitudinal reinforcement (1%, 1.4%, and 2.4%) and two types of installation angle (45 and 90 degree) were used as test variables. The test results in terms of graphs of deflection due to shear forces are presented to demonstrate the ability of different longitudinal reinforcement ratios and installation angle to withstand shear forces. The influence of the test variables on the crack patterns was also observed. It was found that NSM steel bars increase the shear strength of reinforced concrete beams without stirrups significantly. However, in the case of higher longitudinal reinforcement ratios the beams failed in brittle mode as indicated by a sudden drop in the shear force-deflection graphs.
Highlights
The use of Near Surface Mounted (NSM) in the rehabilitation and strengthening of existing damaged concrete structures has been becoming popular in the last decade [1,2,3,4,5]
The test result showed that the injection of epoxy resin with a sealant injection method was effective in restoring the shear strength of damaged reinforced concrete beams
The purpose of this study is to investigate experimentally the shear capacity of reinforced concrete beams strengthened with NSM steel bars
Summary
The use of NSM in the rehabilitation and strengthening of existing damaged concrete structures has been becoming popular in the last decade [1,2,3,4,5]. Increasing the shear capacity of reinforced concrete members by using epoxy resins and steel reinforcements has been used for the past three decades. The efficacy of application of epoxy resins for shear strengthening of pre-cracked reinforced concrete beams with stirrups to increase the shear strength has been observed experimentally in the author's previous study [6]. The shear cracks were injected with epoxy resins using a sealant injection method. The test result showed that the injection of epoxy resin with a sealant injection method was effective in restoring the shear strength of damaged reinforced concrete beams
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