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

2021 ◽  
Vol 331 ◽  
pp. 05009
Author(s):  
Rendy Thamrin ◽  
Zaidir Zaidir
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Peak Load ◽  
Reinforced Concrete Beams ◽  
Flexural Capacity ◽  
Near Surface ◽  
Steel Bars ◽  
Near Surface Mounted ◽  
Monotonic Loads ◽  
Test Result

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.

Calculation of Flexural Capacity of Steel Reinforced Concrete Beams Strengthened with Near-Surface Mounted CFRP Rods

2011 ◽  
Vol 105-107 ◽  
pp. 1031-1034
Author(s):  
Wei Hua Chen ◽  
Mei Qin Wu
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Limit Equilibrium ◽  
Reinforced Concrete Beams ◽  
Flexural Capacity ◽  
Near Surface ◽  
Steel Reinforced Concrete ◽  
Carbon Fiber Reinforce Polymer ◽  
Capacity Calculation ◽  
Near Surface Mounted

Based on earlier theoretical works on RC beams ,the mechanical properties of steel reinforced concrete beams strengthened with NSM (near-surface mounted) CFRP (Carbon fiber reinforce polymer) rods are further investigated theoretically including theirs failure mechanism and load ability. According to the stress patterns of steel reinforced concrete beams strengthened with NSM CFRP rods and different position between neutral axis and steel, the discriminant formula of the boundary destroys and the formula of cross-section flexural capacity calculation are put forward by using limit equilibrium theory.The formula is expressed clearly, simple and easy to use.The depth of compressive region is given in view of different failure types.

scholarly journals Shear strengthening of reinforced concrete beams with near surface mounted steel bars

2019 ◽  
Vol 276 ◽  
pp. 01004 ◽  
Author(s):  
Rendy Thamrin ◽  
Sabril Haris ◽  
Zaidir Haris
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Longitudinal Reinforcement ◽  
Shear Forces ◽  
Near Surface ◽  
Installation Angle ◽  
Bending Load ◽  
Steel Bars ◽  
Near Surface Mounted

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.

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