Cyclic behaviour of squat reinforced concrete shear walls strengthened with ultra-high performance fiber reinforced concrete

2021 ◽  
Vol 246 ◽  
pp. 112999
Author(s):  
Mohammed T. Nagib ◽  
Mohammed A. Sakr ◽  
Saher R. El-khoriby ◽  
Tarek M. Khalifa
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Shear Walls ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Cyclic Behaviour ◽  
High Performance Fiber

Modeling of RC shear walls strengthened with ultra-high performance fiber reinforced concrete (UHPFRC) jackets

2019 ◽  
Vol 200 ◽  
pp. 109696 ◽  
Author(s):  
Mohammed A. Sakr ◽  
Saher R. El-khoriby ◽  
Tarek M. Khalifa ◽  
Mohammed T. Nagib
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Shear Walls ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
High Performance Fiber

Numerical Modelling of Corroded RC Columns Repaired with High Performance Fiber Reinforced Concrete Jacket

2016 ◽  
Vol 711 ◽  
pp. 1004-1011 ◽  
Author(s):  
Fabio di Carlo ◽  
Alberto Meda ◽  
Zila Rinaldi
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Chemical Attack ◽  
Cyclic Behaviour ◽  
High Performance Fiber ◽  
Subsequent Loss ◽  
Full Scale Tests

Reinforcement corrosion can lead to a severe damage in reinforced concrete columns with subsequent loss of bearing capacity. This condition can be deleterious in case of a seismic event. The possibility of repairing and strengthening damaged columns with high performance fiber reinforced concrete (HPFRC) jacketing has been experimentally investigated by some of the authors in previous papers, through full-scale tests on specimens under cyclic loads. The main aim of the intervention was not only to restore the original bearing capacity but also to increase the column durability. In the present paper, a numerical model is developed with the FEM software Diana in order to simulate the cyclic behaviour of corroded r.c. columns reinforced with HPFRC. Particular attention is devoted to the simulation of the corrosion phenomenon and to the strain localization due to the jacket presence. The chemical attack is defined in such a way to account for both the geometrical and mechanical variations of the bar properties. The numerical analyses represent a very useful tool for highlighting the main parameters that have to be considered in evaluating the behaviour of the damaged and then repaired elements. Finally, they constitute a support for the design and, as a consequence, for the reinforcement optimization.

Influence of technological factors on the properties of ultra-high-performance fiber reinforced concrete

2020 ◽  
pp. 135-147
Author(s):  
Igor Chilin ◽  
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Technological Factors ◽  
High Performance Fiber

Приведены результаты исследований и выполнена оценка влияния технологических факторов на реологические свойства самоуплотняющихся сталефибробетонных смесей, определены кратковременные и длительные физико-механические и деформативные характеристики сверхвысокопрочного сталефибробетона, включая определение его фактической морозостойкости.

scholarly journals Resistance of an Optimized Ultra-High Performance Fiber Reinforced Concrete to Projectile Impact

Buildings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 63
Author(s):  
Anna L. Mina ◽  
Michael F. Petrou ◽  
Konstantinos G. Trezos
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Depth Of Penetration ◽  
Projectile Impact ◽  
High Performance Fiber

The scope of this paper is to investigate the performance of ultra-high performance fiber reinforced concrete (UHPFRC) concrete slabs, under projectile impact. Mixture performance under impact loading was examined using bullets with 7.62 mm diameter and initial velocity 800 m/s. The UHPFRC, used in this study, consists of a combination of steel fibers of two lengths: 6 mm and 13 mm with the same diameter of 0.16 mm. Six composition mixtures were tested, four UHPFRC, one ultra-high performance concrete (UHPC), without steel fibers, and high strength concrete (HSC). Slabs with thicknesses of 15, 30, 50, and 70 mm were produced and subjected to real shotgun fire in the field. Penetration depth, material volume loss, and crater diameter were measured and analyzed. The test results show that the mixture with a combination of 3% 6 mm and 3% of 13 mm length of steel fibers exhibited the best resistance to projectile impact and only the slabs with 15 mm thickness had perforation. Empirical models that predict the depth of penetration were compared with the experimental results. This material can be used as an overlay to buildings or to construct small precast structures.

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