Analytical approach for membrane action in laterally-restrained reinforced concrete square slabs under uniformly distributed loads

2021 ◽  
Vol 41 ◽  
pp. 102427
Author(s):  
Shan Wang ◽  
Shao-Bo Kang ◽  
Qiao-Ling Fu ◽  
Jiaxing Ma ◽  
Patryk Ziolkowski
Keyword(s):  
Reinforced Concrete ◽  
Analytical Approach ◽  
Membrane Action ◽  
Uniformly Distributed Loads

scholarly journals Cyclic Shear Performance of Reinforced Concrete Columns Strengthened by External Steel Rods

2021 ◽  
Vol 13 (23) ◽  
pp. 13224
Author(s):  
Hyeong-Gook Kim ◽  
Yong-Jun Lee ◽  
Kil-Hee Kim
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Analytical Approach ◽  
Concrete Columns ◽  
Loading Test ◽  
Rc Structures ◽  
Cyclic Shear ◽  
Flexural Failure ◽  
Shear Performance ◽  
Strengthening Method

This study presents a strengthening method for reinforced concrete (RC) columns. The proposed method, which consists of a pair of steel rods, two reverse-threaded couplers, and four corner blocks, is feasible and straightforward. A quasi-static cyclic loading test was performed on the columns externally strengthened by the steel rods. It was found that the corner blocks and the external steel rods with a low prestress level effectively confined the concrete on the compression side of plastic hinges, which eventually induced flexural failure with a ductility higher than three in the strengthened columns. In addition, an analytical approach to predict the shear strength and ultimate flexural strength of the externally strengthened columns was applied. The comparison of analytical and experimental results showed that the analytical approach provided highly accurate predictions on the maximum strength and the failure mode of the externally strengthened columns. It is expected that the application of the proposed method will improve the seismic performance of damaged or deteriorated RC structures, thereby increasing their lifespan expectancy and sustainability.

On the nonlinear behaviour of reinforced concrete frames

1990 ◽  
Vol 17 (5) ◽  
pp. 698-704 ◽  
Author(s):  
F. J. Vecchio ◽  
S. Balopoulou
Keyword(s):  
Reinforced Concrete ◽  
Large Scale ◽  
Load Capacity ◽  
Concrete Strength ◽  
Theoretical Modelling ◽  
Nonlinear Behaviour ◽  
Concrete Frames ◽  
Membrane Action ◽  
Ultimate Load Capacity ◽  
Plane Frame

An experimental investigation is described in which a large-scale reinforced concrete plane frame is tested to study factors contributing to its nonlinear behaviour under short-term loading conditions. The test results indicate that frame behaviour can be significantly affected by second-order influences such as material nonlinearities, geometric nonlinearities, concrete shrinkage, tension stiffening effects, shear deformations, and membrane action. A nonlinear frame analysis procedure, previously developed taking these mechanisms into account, is shown to accurately predict most aspects of behaviour, including deflection response, ultimate load capacity, and failure mechansim. Aspects of the theoretical modelling which are in need of further improvement are also identified. Key words: analysis, behaviour, deformation, frame, large scale, nonlinear, reinforced concrete, strength, test.

Prediction Methods for Ultimate Strengths in GFRP Reinforced Concrete Bridge Deck Slabs

2010 ◽  
Vol 163-167 ◽  
pp. 1139-1142
Author(s):  
Yu Zheng ◽  
Yun Feng Pan
Keyword(s):  
Reinforced Concrete ◽  
Bridge Deck ◽  
Prediction Method ◽  
Theoretical Method ◽  
Concrete Bridge ◽  
Membrane Action ◽  
Reinforced Concrete Bridge ◽  
Deck Slabs ◽  
Bridge Deck Slabs ◽  
Concrete Bridge Deck

The corrosion of reinforcement embedded in concrete bridge deck slabs has been the cause of major deterioration and of high costs in repair and maintenance. Fibre reinforced polymers (FRP) exhibit high durability in combination with high strength and light weight. The majority of research with FRP bars for reinforcing concrete has been on simply supported beams and slabs where the low value of elasticity of FRP has meant that the service behaviour has been critical. These differences have been attributed to the low value of elasticity of many FRPs compared to steel. However, laterally restrained slabs, such as those in bridge deck slabs, exhibit arching action or compressive membrane action (CMA), which has a beneficial influence on the service behaviour such as the deflection. Based on the previous research on CMA in steel reinforced concrete bridge deck slabs, a modified theoretical method were established according to the material properties of GFRP reinforcement. The proposed prediction method showed a good collection of some reported GFRP reinforced slabs experimental tests.

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