Efficient near surface mounted CFRP shear strengthening of high strength prestressed concrete beams – An experimental study

2017 ◽  
Vol 180 ◽  
pp. 16-28 ◽  
Author(s):  
Vikas Singh Kuntal ◽  
Maheswaran Chellapandian ◽  
Shanmugam Suriya Prakash
Keyword(s):  
Experimental Study ◽  
Prestressed Concrete ◽  
Concrete Beams ◽  
High Strength ◽  
Shear Strengthening ◽  
Near Surface ◽  
Near Surface Mounted

Experimental Study on Flexural Performances of Concrete Beams Strengthened with Near-Surface Mounted (NSM) FRP Reinforcement

2010 ◽  
Vol 163-167 ◽  
pp. 3634-3639
Author(s):  
Li Li Sui ◽  
Tie Jun Liu ◽  
Feng Xing ◽  
Yu Xiang Fu
Keyword(s):  
Experimental Study ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Flexural Stiffness ◽  
Test Results ◽  
Near Surface ◽  
Bending Performance ◽  
Bending Capacity ◽  
Frp Reinforcement ◽  
Near Surface Mounted

This paper illustrates the results of an experimental study on the bending performance of concrete beams strengthened with near-surface mounted (NSM) FRP reinforcement. The critical parameter of the embedded length of NSM-FRP plates was investigated in particularly. The test results indicated that NSM-FRP reinforcement can significantly improve the strength and crack resistance capacity of the concrete beam, reducing the size of cracks. The embedded length of the NSM-FRP plate has distinct influence on the cracking and bending capacity, the flexural stiffness, and the crack developments of the concrete beam. As the embedded length increased, the bending capacity and the flexural stiffness increased correspondingly and the crack developed more intensively.

Experimental Study on Flexural Bearing Capacity of Concrete Beams Strengthened with NSM CFRP-PCPs Composite Bars

2014 ◽  
Vol 584-586 ◽  
pp. 908-911
Author(s):  
Li Hong Cheng ◽  
Jiong Feng Liang ◽  
Ming Hua Hu
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Flexural Behavior ◽  
Concrete Member ◽  
Near Surface ◽  
Reinforced Concrete Member ◽  
Bonding Area ◽  
Flexural Bearing Capacity ◽  
Near Surface Mounted

The flexural behavior of concrete beams strengthened with near surface mounted (NSM) CFRP-PCPs composite rebars was studied. Experimental results showed that embedded CFRP-PCPs reinforcement method can effectively improve strength, stiffness and cracks of the reinforced concrete member, and PCPs increased with concrete bonding area, thus avoiding the strip damage of the traditional embedded reinforcement.

scholarly journals FLEXURAL BEHAVIOR OF PRESTRESSED CONCRETE BEAMS STRENGTHENED BY NEAR SURFACE MOUNTED FRP RODS

2019 ◽  
Vol 14 (53) ◽  
pp. 1424-1435
Author(s):  
Belal Elharouney ◽  
Ayman Hussein ◽  
Ezz El-Deen Mostafa ◽  
Amr Elnemr
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beams ◽  
Flexural Behavior ◽  
Near Surface ◽  
Near Surface Mounted

Experimental Research on Flexural Behavior of Load-Bearing Characteristics on Reinfoeced Concrete Beams Strengthened with near Surface Mounted Prestressed CFRP Tendons

2011 ◽  
Vol 94-96 ◽  
pp. 1415-1419
Author(s):  
Ping Xu ◽  
Min Xia Zhang ◽  
Ya Hong Ding ◽  
Xing Guo Wang
Keyword(s):  
Concrete Beams ◽  
High Strength ◽  
Concrete Surface ◽  
Flexural Behavior ◽  
Bending Test ◽  
Near Surface ◽  
Load Bearing ◽  
Strength Performance ◽  
Near Surface Mounted ◽  
Different Levels

In order to improve flexural behavior of concrete beams, the 7mm-diameter carbon fiber reinforced plastic (CFRP) tendons applied different levels of prestress were put in to 20×20mm grooves opened in the concrete surface of the tensile region in the concrete beams.Grooves were filled with building structural adhesive, when it solidified bending test of strengthened beams would carry out. Flexural behavior of nine RC beams strengthened with prestressed near surface mounted CFRP tendons applied different levels of prestress and one unstrengthened RC beam were studied. In these tests, bending stiffness and load-bearing characteristics of test specimens were studied. Experimental results show that the high-strength performance of CFRP have been made full use; the stiffness of strengthened beams risen notably, the maximal crack load increased by 303.17%, the maximal ultimate load increased by 237.92%.

scholarly journals Rehabilitation of concrete one-way slabs using precast prestressed concrete prisms

2021 ◽  
Author(s):  
Saeed Gerami ◽  
Dagmar Svecova
Keyword(s):  
Prestressed Concrete ◽  
High Strength Concrete ◽  
High Strength ◽  
Near Surface ◽  
Complex Process ◽  
Before And After ◽  
Near Surface Mounted ◽  
Wire Steel ◽  
Precast Prestressed Concrete ◽  
Crack Widths

The rehabilitation of structures is a complex process that involves many considerations. This paper presents results of a feasibility study on the use of precast prestressed concrete prisms (PCPs) as a near-surface mounted reinforcement for rehabilitation of cracked one-way slabs. The PCPs were cast with high-strength concrete and were concentrically prestressed by one 9 mm diameter stress-relieved seven-wire steel strand. Six identical one-way slabs with a length of 3000 mm were tested. They were loaded until cracking, then fully unloaded and rehabilitated with four PCPs before loading them to failure. Deflected profiles and crack widths of the slabs before and after rehabilitation were compared in this research. This rehabilitation method reduced the magnitude of deflection and crack width of the samples. The cracks induced in the first phase of loading before PCP rehabilitation appeared fully closed after the PCP rehabilitation until five times the original cracking loads of the slabs.

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