THE PUNCHING RESISTANCE OF PRESTRESSED CONCRETE SLABS.

1986 ◽  
Vol 81 (3) ◽  
pp. 489-490
Author(s):  
PE REGAN ◽  
DJ CLELAND ◽  
AE LONG
Keyword(s):  
Prestressed Concrete ◽  
Concrete Slabs

Nonlinear Analysis of Prestressed Concrete Slabs

1983 ◽  
Vol 109 (7) ◽  
pp. 1742-1760 ◽  
Author(s):  
Johannes Van Greunen ◽  
Alexander C. Scordelis
Keyword(s):  
Nonlinear Analysis ◽  
Prestressed Concrete ◽  
Concrete Slabs

scholarly journals The Measurement of P-, S-, and R-Wave Velocities to Evaluate the Condition of Reinforced and Prestressed Concrete Slabs

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Young Hak Lee ◽  
Taekeun Oh
Keyword(s):  
Prestressed Concrete ◽  
Goodness Of Fit ◽  
Concrete Structures ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Experimental Results ◽  
P Wave ◽  
Concrete Slabs ◽  
Goodness Of Fit Test ◽  
Wave Velocities

The traditional P-wave ultrasonic measurement has been used for the condition assessment of general reinforced concrete structures for a long time, but the effects of prestressing applied to concrete structures such as long-span buildings and bridges on ultrasonic pulse velocity have not been studied clearly. Therefore, this study analyzed the statistical distribution of P-wave ultrasonic pulse velocities in reinforced and prestressed concrete slabs of 3000 × 3000 mm with a thickness of 250 mm. In addition, we measured S- and R-waves to identify experimental consistency by statistical analysis using the Kolmogorov-Smirnov goodness-of-fit test. The experimental results show that the P-, S-, and R-wave velocities increased slightly (2-3%) when prestressing was applied. As expected, the S- and R-wave measurements show better statistical reliability and potential for in situ evaluation than the P-wave because they are less sensitive to confinement and boundary conditions. The experimental results in this study can be used when assessing the condition of prestressed concrete structures through the velocities of elastic waves.

THE EFFECT OF IMPACT LOADS ON PRESTRESSED CONCRETE SLABS

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Youmn Al Rawi ◽  
Yehya Temsah ◽  
Hassan Ghanem ◽  
Ali Jahami ◽  
Mohamad Elani
Keyword(s):  
Reinforced Concrete ◽  
Prestressed Concrete ◽  
Impact Loading ◽  
Concrete Slab ◽  
Concrete Slabs ◽  
Shear Mode ◽  
Reinforced Concrete Slab ◽  
Finite Element Program ◽  
Reinforced Concrete Slabs ◽  
The Impact

Many research studies have been conducted on the effect of impact loading on structures, and design procedures were proposed for reinforced concrete (RC) slabs; however the availability of these studies and procedures are limited for prestressed slabs. The proposed research will examine, using numerical analysis, the impact of rock fall on prestressed concrete slabs with equivalent moment capacity reinforced concrete slabs. It is expected that prestressed concrete slabs will have different behavior to resist impact loading compared with traditional reinforced concrete slabs. The thickness of the prestressed concrete slab will be 25cm whereas that of the reinforced concrete slab will be 30cm. The impact loading consists of 500Kg drop weight. The drop height will be 10m, 15m and 20m.The structural analysis is performed using a Finite Element program "ABAQUS". A comparison will be done between both slab types in terms of failure mode, damage, and deflection. It has been found that both slabs failed in punching. However, the RC slab performed better than the prestressed concrete slab with respect to the value of the deflection at mid-span, while both showed punching shear mode of failure.

Reliability-based inspection of post-tensioned concrete slabs

1996 ◽  
Vol 23 (1) ◽  
pp. 242-249 ◽  
Author(s):  
M. D. Pandey ◽  
M. A. Nessim
Keyword(s):  
Prestressed Concrete ◽  
Cost Effective ◽  
Bayes Theorem ◽  
Concrete Slabs ◽  
Design Code ◽  
Annual Probability ◽  
Key Words Reliability ◽  
Incremental Strategy ◽  
Existing Structure ◽  
Post Tensioned

In unbonded, post-tensioned prestressed concrete slabs and beams, corrosion of prestressed tendons due to moisture ingress and their subsequent breakage has been identified as a major problem raising serious concern over the safety of aged structures. The paper presents a practical Bayesian approach to reliability assessment of such structures based on the inspection of a randomly selected sample of prestressing tendons. To minimize inspection costs, clear guidelines are presented for selecting the minimum sample size necessary to demonstrate that the annual probability of failure of an existing structure is below the target value of 10−5, implied in the Canadian Standards Association concrete design code CAN3-A23.3-M84. A systematic and cost-effective incremental strategy is developed for inspection of existing prestressed concrete structures. Key words: reliability, Bayes theorem, prestressed concrete, unbonded post-tensioned system, inspection, corrosion, probability distribution, CSA Standard CAN3-A23.3-M84, slab.

Brief Analysis on the Mechanical Behavior Influenced by Opening Locations of the Unbonded Prestressed Concrete Slabs

2011 ◽  
Vol 243-249 ◽  
pp. 774-778
Author(s):  
Ling Zhi Jin ◽  
Hong Mei Zhou ◽  
Qiang Fu ◽  
Xiao Jie Zhou ◽  
Yu Lin Xie
Keyword(s):  
Mechanical Behavior ◽  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Concrete Slab ◽  
Ultimate Bearing Capacity ◽  
Hole Drilling ◽  
Concrete Slabs ◽  
Uniform Load ◽  
Yield Line Theory ◽  
Line Theory

The unbonded prestressed concrete slabs is usually used in big span high-rise buildings. Due to the existence of stairs, elevators, piping shafts and washroom etc，（hole drilling is usually encountered in the floor of unbonded prestressed concrete structures）, which weakens the rigidity of concrete slab, and it has different influences on the slabs with openings in different locations. Based on the contrast experiments of the unbonded prestressed concrete slab with openings in different locations subjected to uniform load, this thesis investigates and analyzes mechanical behavior of the unbonded prestressed concrete slabs with openings in different locations (central，around edge and corner) subjected to uniform load. Using the yield-line theory to calculate the ultimate bearing capacity of pre-stressed slabs with openings, and comparing from experimental results to theoretical ones, this paper puts forward some conclusions of how different opening locations impact the ultimate bearing capacity of pre-stressed slabs with openings

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