A thermodynamics-based damage-plasticity model for bond stress-slip relationship of steel reinforcement embedded in fiber reinforced concrete

2019 ◽  
Vol 180 ◽  
pp. 762-778 ◽  
Author(s):  
Le Huang ◽  
Yin Chi ◽  
Lihua Xu ◽  
Fangqian Deng
Keyword(s):  
Reinforced Concrete ◽  
Steel Reinforcement ◽  
Bond Stress ◽  
Fiber Reinforced Concrete ◽  
Plasticity Model ◽  
Fiber Reinforced ◽  
Relationship Of

Bond stress-slip behaviour of steel reinforcing bar embedded in hybrid fiber-reinforced concrete

2013 ◽  
Vol 17 (7) ◽  
pp. 1700-1707 ◽  
Author(s):  
Rashid Hameed ◽  
Anaclet Turatsinze ◽  
Frédéric Duprat ◽  
Alain Sellier
Keyword(s):  
Reinforced Concrete ◽  
Bond Stress ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Reinforcing Bar

scholarly journals Parametric Study on Moment Redistribution of Fiber Reinforced Concrete Continuous Beams with Basalt FRP Bars

2020 ◽  
Author(s):  
Abdelrahman Hamdi Abushanab ◽  
Wael I Alnahhal
Keyword(s):  
Reinforced Concrete ◽  
Parametric Study ◽  
Steel Reinforcement ◽  
Reinforcement Ratio ◽  
Fiber Reinforced Concrete ◽  
Elastic Behaviour ◽  
Fiber Reinforced ◽  
Moment Redistribution ◽  
Continuous Beams ◽  
Frp Bars

The state of Qatar is suffering from its harsh environment and coastal conditions, which stand for most of the year. As a result, steel-reinforced concrete structures are subjected to rapid corrosion and deterioration. Therefore, there is a necessity to replace the conventional steel reinforcement by fiber-reinforced polymers (FRP) bars. Apart from FRP bars corrosion resistance, their strength to weight ratio is higher than steel reinforcement, which made the FRP, bars a viable alternative to steel reinforcement. Continuous concrete beams are commonly used elements in structures such as parking garages and overpasses. In such structures, forces could be distributed between the critical sections after cracking. This phenomenon is called moment redistribution. It reduces the congested rebars in connections and enhances the ductility of the members. However, the linear-elastic behaviour of FRP materials makes the ability of continuous beams to redistribute loads and moments questionable. This study aims to investigate the capability of moment redistribution of basalt fiber reinforced concrete (BFRC) continuous beams reinforced with basalt FRP (BFRP) bars. Eleven reinforced concrete (RC) continuous beams of 200 x 300 x 4000 mm were tested up to failure under fivepoint loading. The main investigated parameters were the reinforcement ratio (0.6rb, 1.0rb, 1.8rb and 2.8rb; where rb is the balanced reinforcement ratio), stirrups spacing (80 and 120 mm) and volume fractions of Basalt-macro fibers (BMF) (0.75 and 1.5%). A parametric study was then conducted using a validated finite element (FE) model to extend the investigated parameters that may affect the moment redistribution of RC continuous beams. It was concluded that moment redistribution occurs in beams that have at least a ratio of bottom to top reinforcement of 0.3.

scholarly journals Ultra high Performance Fiber Reinforced Concrete Panel Subjected to Severe Blast Loading

2020 ◽  
Vol 70 (6) ◽  
pp. 603-611 ◽  
Author(s):  
Viet-Chinh Mai ◽  
Ngoc-Quang Vu ◽  
Van-Tu Nguyen ◽  
Hoang Pham
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Dynamic Behaviour ◽  
Blast Loading ◽  
Steel Reinforcement ◽  
Fiber Reinforced Concrete ◽  
Supplementary Information ◽  
Fiber Reinforced ◽  
Technical Requirements ◽  
High Performance Fiber

Experimental studies play a crucial role in shedding light on the dynamic behaviour of structures under blast loading. However, high costs and complicated technical requirements, particularly for full-scale structures, are still huge disadvantages to conduct such a series of tests. Hence, the finite element method is much needed to provide supplementary information to previous experiments and to enable further parametric studies without testing. This article presents a numerical investigation carried out to understand the behaviour of ultra high performance fiber reinforced concrete (UHPFRC) panels under severe blast loading. The authors designed a subroutine with eight numbers of solution-dependent state variables, 32 mechanical constants, integrated with the Abaqus program to analyze the dynamic behaviour of UHPFRC against multiple blast impacts, using the Johnson-Holmquist 2 damage model incorporating both the damage and residual strength of the material. The subroutine was validated by comparing the simulation results with test results. For the purpose of estimating the structural response of the UHPFRC panel subjected to blast loading, other studying scenarios were considered by varying input parameters, including the thickness of the panel, stand-off distance, and steel reinforcement bar volume. The variations in deflection, strain, and damage of the UHPFRC panel, as well as the steel reinforcement strain, were also evaluated. Through important obtained results, the UHPFRC panel is strongly recommended for a protective barrier installed in the vicinity of critical infrastructure against severe blast loading

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