Fatigue behaviour of damaged RC beams strengthened with ultra high performance fibre reinforced concrete

2018 ◽  
Vol 116 ◽  
pp. 659-668 ◽  
Author(s):  
A. Ramachandra Murthy ◽  
B.L. Karihaloo ◽  
P. Vindhya Rani ◽  
D. Shanmuga Priya
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Fatigue Behaviour ◽  
Fibre Reinforced Concrete ◽  
Rc Beams ◽  
High Performance Fibre

scholarly journals Probabilistic fatigue analysis of ultra-high-performance fibre-reinforced concrete under thermal effects

2018 ◽  
Vol 165 ◽  
pp. 12001
Author(s):  
José D. Ríos ◽  
Héctor Cifuentes
Keyword(s):  
Reinforced Concrete ◽  
Thermal Effects ◽  
High Performance ◽  
High Performance Concrete ◽  
Fatigue Behaviour ◽  
Fibre Reinforcement ◽  
Fibre Reinforced Concrete ◽  
Ultra High Performance Concrete ◽  
Polypropylene Fibres ◽  
High Performance Fibre

This paper describes the influence of the temperature and the fibre reinforcement on the flexural fatigue behaviour of an ultra-high-performance fibre-reinforced concrete. Three-point bending fatigue tests were carried out for an ultra-high-performance concrete subjected to different temperatures ranging from room temperature up to 300 ºC and considering three different types of reinforcement: a) steel fibres, b) hybrid steel and polypropylene fibres and c) non-reinforced (reference matrix). The fatigue behaviour was assessed from the S-N fields obtained through a probabilistic fatigue model developed by Castillo and Fernández-Canteli. The influence of the type of reinforcement on the fatigue behaviour was analysed by SN curves. An analysis of the thermal effects in the fatigue life of the ultra-high-performance concrete has also been carried out. The results showed the most suitable fibre reinforcement among the analysed options to get the best fatigue behaviour in accordance to the exposure temperature.

Flexural fatigue behaviour of a heated ultra-high-performance fibre-reinforced concrete

2021 ◽  
Vol 276 ◽  
pp. 122209
Author(s):  
José D. Ríos ◽  
Héctor Cifuentes ◽  
Sergio Blasón ◽  
Manuel López-Aenlle ◽  
Antonio Martínez-De La Concha
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Fatigue Behaviour ◽  
Fibre Reinforced Concrete ◽  
Flexural Fatigue ◽  
High Performance Fibre

scholarly journals Strengthening of reinforced concrete beams: RC versus UHPFRC layers

2021 ◽  
Author(s):  
Andreas Lampropoulos ◽  
Ourania Tsioulou ◽  
Spyridon Paschalis ◽  
Stephanos Dritsos
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fibre Reinforced Concrete ◽  
Rc Beams ◽  
Existing Buildings ◽  
Rc Structures ◽  
Interface Slip ◽  
High Performance Fibre

<p>Strengthening of Reinforced Concrete (RC) beams is of high importance for the structural upgrade of existing buildings. The majority of the existing RC structures need to be upgraded either because they are designed with old or without seismic code provisions or because of existing damages. In this study the effectiveness of the use of traditional RC layers is compared with the use of Ultra High Performance Fibre Reinforced Concrete (UHPFRC) layers. Experimental investigation has been conducted on beams strengthened with these two techniques and the effectiveness of the examined methods has been evaluated via comparisons of the load-deflection and the interface slip results.</p>

scholarly journals Behaviour of UHPFRCs in compression under high stress-rates

2018 ◽  
Vol 183 ◽  
pp. 02005
Author(s):  
Ezio Cadoni ◽  
Matteo Dotta ◽  
Daniele Forni
Keyword(s):  
Reinforced Concrete ◽  
Mechanical Behaviour ◽  
High Performance ◽  
High Stress ◽  
Slight Reduction ◽  
Fibre Reinforcement ◽  
Fibre Reinforced Concrete ◽  
Dynamic Event ◽  
The Matrix ◽  
High Performance Fibre

The paper presents the results obtained on cylindrical Ultra High Performance Fibre Reinforced Concrete specimens with diameter of 30mm and a height of 60mm under compression at high stress rate (1.7–2.3 TPa/s). Four different percentages of fibre reinforcement are considered (1, 2, 3, and 4% fibre content) and compared with the results of the matrix (UHPC). A slight reduction of the strength and fracture time with the introduction of fibres is observed. The experimental results are analysed and discussed with the intent to better understand the mechanical behaviour of UHPFRC materials in case of dynamic event under service loading conditions.

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