Flexural capacity of RC beams strengthened with near-surface mounted steel bars

Rendy Thamrin,Zaidir Zaidir,L Comfort,S Saravanan,Fauzan Fauzan,I.W Sengara

doi:10.1051/e3sconf/202133105009

Abstract

An experimental study carried out to observe the flexural capacity of reinforced concrete beams strengthened with Near Surface Mounted (NSM) steel bars is presented. The test was carried out on nine concrete beams. All tested beams were subjected to two-point monotonic loads. The ratio of longitudinal reinforcement (1%, 1.4%, and 2.4%) and NSM bars (1D16 and 2D16) were used as test variables. It was found from the test result that NSM steel bars significantly increase the flexural capacity of reinforced concrete beams. However, the strengthened beams failed in brittle mode, as indicated by a sudden drop of beams capacity. An analytical study was also conducted to obtain the flexural response of the specimens through all ranges of elastic and post-peak load. The prediction of the flexural capacity of the beams compares well with the test result.

Highlights

In recent years, research on retrofitting reinforced concrete structures has resulted in a wide choice of methods that can be used for reinforcement
Another study reported that steel plates installed using the Near Surface Mounted (NSM) method made a significant contribution to the shear strength of concrete beams [11]
The purpose of this paper is to examine the flexural capacity of reinforced concrete beams strengthened with steel bars by applying the NSM method

Summary

Introduction

Research on retrofitting reinforced concrete structures has resulted in a wide choice of methods that can be used for reinforcement. The near-surface installation (NSM) method, which is a more practical method, was introduced for strengthening reinforced concrete structures [2,3]. Besides increasing the bending capacity of the beam structure [4] strengthening method using NSM with steel bars can be used to improve the shear capacity of the beams [5, 10]. Another study reported that steel plates installed using the NSM method made a significant contribution to the shear strength of concrete beams [11]. This method is proven to protect the environment where the reinforcing bars used as strengthening are covered by a material made of epoxy [6]

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Conclusion