Studies on damage and FRP strengthening of reinforced concrete beams by vibration monitoring

2009 ◽  
Vol 31 (4) ◽  
pp. 875-893 ◽  
Author(s):  
Neda Baghiee ◽  
M. Reza Esfahani ◽  
Kazem Moslem
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Vibration Monitoring ◽  
Frp Strengthening

Reliability-Based Shear Design for Reinforced Concrete Beams with U-Wrap FRP Strengthening

2008 ◽  
Vol 400-402 ◽  
pp. 525-530
Author(s):  
Zheng He ◽  
Miao Hong Shang ◽  
Xiao Ming Li
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Resistance Factor ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymers ◽  
Load Effect ◽  
Shear Design ◽  
Before And After ◽  
Frp Strengthening ◽  
Effect Ratio

The resistance factor in the draft version of Chinese Technical code for the application of fiber reinforced polymers in civil engineering for the shear-resistant design of reinforced concrete beams with U-wrap FRP strengthening is assessed from the probabilistic standpoint. The assessment using a resistance-factor-related computational uncertainty factor indicates that the average reliability indexes, for either unstrengthening or strengthening, increases at a slowing rate as load effect ratio increases from 0.10 to 2.5, and that the average reliability indexes for strengthened beams would dramatically decrease up to 19.2%~28.5% with the resistance factor specified in the code for U-wrap strengthening. A so-called reliability strengthening ratio is introduced to evaluate the change in average reliability index before and after strengthening with different resistance factors. A parametric study on this factor shows that if the reliability level in strengthened reinforced concrete beams is kept to be consistency with their corresponding unstrengthened beams, a value of 0.67 could be applied. The proposed relationship between reliability strengthening ratio and the resistance factor could be also used in personalized designs.

scholarly journals HIGH Tg FRP & CEMENTITIOUS ADHESIVE, Potential benefits in fire for NSM FRP strengthened reinforced concrete beams

2016 ◽  
Author(s):  
Iolanda Del Prete ◽  
Antonio Bilotta ◽  
Luke Bisby ◽  
Emidio Nigro
Keyword(s):  
Thermal Conductivity ◽  
Reinforced Concrete ◽  
Failure Modes ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Near Surface ◽  
Good Thermal Stability ◽  
Externally Bonded ◽  
Frp Strengthening ◽  
In Fire

<p>Near surface mounted FRP strengthening is potentially less prone to damage due tofire exposure than externally bonded FRP reinforcement (EBR), provided that: (a) an FRP strengthening material with high glass transition and decomposition temperatures (<em>T<sub>g</sub></em> and<em>T<sub>d</sub></em>, respectively); and (b) a bonding agent with low thermal conductivity and good thermal stability, are used. This paper presents a project undertaken on a specific high <em>T<sub>g</sub></em> and cementitious adhesive bonded NSM FRP strengthening system. Dynamic Mechanic Analysis (DMA) and Thermogravimetric Analysis (TGA) performed on the novel high <em>T<sub>g</sub></em> commercial CFRP bar yielded a <em>T<sub>g</sub></em> value of 220°C (based on  peak) and <em>T<sub>d</sub></em> of about 360°C. Thermal conductivity tests were also performed on the cementitious grout. The results were used to better explain the failure modes of NSM FRP strengthened reinforced concrete beams at elevated temperature. The paper highlights the importance of understandingthe thermo-mechanical properties of the various constituent materials for improving the performance of FRP strengthening systems in fire.</p>

The Dynamic Behavior and Vibration Monitoring of Reinforced Concrete Beams

1998 ◽  
Vol 26 (5) ◽  
pp. 405 ◽  
Author(s):  
DR Petersen ◽  
RE Link ◽  
Z Wang ◽  
XTC Man ◽  
RD Finch ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Behavior ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Vibration Monitoring
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