A review of cracking of partially prestressed concrete members

1985 ◽  
Vol 12 (3) ◽  
pp. 645-652 ◽  
Author(s):  
B. deV. Batchelor ◽  
M. El Shahawi
Keyword(s):  
Key Words ◽  
Prestressed Concrete ◽  
Crack Width ◽  
Sparse Data ◽  
Simple Expression ◽  
Test Results ◽  
Strong Case ◽  
Concrete Members ◽  
Maximum Crack ◽  
Prestressed Reinforcement

A selective review of cracking of partially prestressed concrete members is presented. The main studies, together with the resulting methods for calculating maximum crack width, are critically examined. From an analysis of published test results it is shown that, in the light of the sparse data available, there is no point in using a complicated crack width formula for partially prestressed members. A simple expression for calculating crack width is proposed, which involves only the calculation of stress in the non-prestressed reinforcement. A strong case is made for further research in this area so that effects of the controlling parameters may be considered, where necessary. Key words: concrete (prestressed), cracking, crack width, partial prestressing.

Experimental Research on Crack Width of Retard-Bonded Partially Prestressed Concrete Beams

2013 ◽  
Vol 639-640 ◽  
pp. 211-215 ◽  
Author(s):  
Xin Feng ◽  
Xian Yan Zhou
Keyword(s):  
Experimental Research ◽  
Prestressed Concrete ◽  
Crack Width ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Test Results ◽  
Paper Test ◽  
Concrete Members ◽  
Maximum Crack ◽  
The Relationship

Retard-bonded prestressed concrete which has appeared in recent twenty years is a new and distinctive prestressed system. For the research on mechanical behavior and service property of retard-bonded prestressed concrete members, retard-bonded prestressed strands were made by manual work in this paper. Experimental research and theoretical analysis of three retard-bonded partially prestressed concrete T-beams were carried out under static loadings. The law of crack development and distribution both with the relationship between load and maximum crack width were studied in the paper. Test results were contrasted with experimental studies of two traditional partially prestressed concrete T-beams, and the characters and merits of retard-bonded partially prestressed concrete T-beams were obtained. It provides theoretical reference for the actual project application of the new retard-bonded prestressed concrete system.

Cracking behaviour of concrete beams reinforced with fiber reinforced plastic rebars

1996 ◽  
Vol 23 (6) ◽  
pp. 1172-1179 ◽  
Author(s):  
R. Masmoudi ◽  
B. Benmokrane ◽  
O. Chaallal
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Concrete Beams ◽  
Reinforcement Ratio ◽  
Test Results ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Concrete Members ◽  
Reinforced Plastic ◽  
Cracking Pattern

This paper presents the results of an experimental investigation on the cracking behaviour of concrete beams reinforced with fiber reinforced plastic rebars. The effects of reinforcement ratio on the cracking pattern, crack spacing, cracking moment, and crack width are investigated. The test results indicate that the reinforcement ratio has no meaningful effect on the cracking moment, which can be calculated as recommended by the ACI code. Also, the use of the equations adopted by ACI and the European codes for the prediction of crack width of conventionally reinforced concrete members is investigated and due modifications are made. Both relationships show good correlation with the test results; and the prediction of crack width of concrete beams reinforced with these two types of fiber reinforced plastic rebars is now possible. Key words: beam, cracking behaviour, cracking moment, crack width, fiber reinforced plastic, flexure, rebars, reinforced concrete, reinforcement ratio.

scholarly journals Regression Analysis of Bond Parameters between Corroded Rebar and Concrete Based on Reported Test Data

2018 ◽  
Vol 2018 ◽  
pp. 1-18 ◽  
Author(s):  
H. J. Zhou ◽  
Y. F. Zhou ◽  
Y. N. Xu ◽  
Z. Y. Lin ◽  
F. Xing ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Bond Strength ◽  
Crack Width ◽  
Experimental Tests ◽  
Test Results ◽  
Bond Slip ◽  
Regression Effect ◽  
Pull Out ◽  
Maximum Crack ◽  
Best Fit

Reinforcement corrosion is a major cause of degradation in reinforced concrete structures. The fragile rust layer and cracking and spalling of the cover caused by splitting stress due to rust expansion can alter bond behaviors significantly. Despite extensive experimental tests, no stochastic model has yet incorporated randomness into the bond parameters model. This paper gathered published experimental data on the bond-slip parameters of pull-out specimens and beam-end specimens. Regression analysis was carried out to identify the best fit of bond strength and the corresponding slip value in the context of different corrosion levels from the recollected test results. An F-test confirmed the regression effect to be significant. Residual data were also analyzed and found to be well described by a normal distribution. Crack width data of the tested specimens were also collected. A regression analysis of the bond strength and maximum crack width was carried out given the comparative simplicity of measuring crack width versus rebar area loss. Results indicate that maximum crack width can also be used to predict bond strength degradation with similar variation magnitude.

Experimental Investigation on Flexural Behavior of 500MPa Reinforced Concrete Beams with and without Skin Reinforcement

2013 ◽  
Vol 368-370 ◽  
pp. 1668-1673
Author(s):  
Zhi Hua Li ◽  
Xiao Zu Su
Keyword(s):  
Crack Width ◽  
Concrete Beams ◽  
Limit State ◽  
Crack Spacing ◽  
Reinforced Concrete Beams ◽  
Flexural Behavior ◽  
Test Results ◽  
Average Crack ◽  
Maximum Crack ◽  
Short Time

Fourteen concrete beams reinforced with 500MPa longitudinal steel bars, of which 6 with skin reinforcement and 8 without skin reinforcement, were tested under two-point symmetrical concentrated static loading to investigate their flexural behavior. The results indicate that the flexural behavior and deflection mode of test beams with skin reinforcement are basically consistent with those of test beams without skin reinforcement. The use of skin reinforcement can significantly reduce average crack spacing and short-time maximum crack width. And the use of skin reinforcement can also slightly increase the short-time stiffness. Under the serviceability limit state, mid-span deflections are in good agreement with the calculated values according to formula in GB50010-2010. However most of calculated average crack spacing and short-time maximum crack width are larger than measured values. According to the test results, the normal formula of crack width should be revised.

Failure Modes and Acceptance Criteria of Reinforced Prestressed Concrete Railway Sleepers Based on Dynamic Loading Tests

2015 ◽  
Vol 752-753 ◽  
pp. 522-527 ◽  
Author(s):  
Marcela Karmazínová
Keyword(s):  
Dynamic Loading ◽  
Prestressed Concrete ◽  
Crack Width ◽  
Failure Modes ◽  
Dynamic Behaviour ◽  
Test Results ◽  
Acceptance Criteria ◽  
Loading Tests ◽  
The Moment ◽  
Total Fracture

The paper is focused on the problems of the dynamic behaviour, failure and resistance of reinforced prestressed concrete railway sleepers, developed and verified continuously in the period of several last years. The results of dynamic loading tests are presented for the sleepers for both wide and narrow track gauge. The test results have been evaluated using the criteria for the acceptance based on the load corresponding to the prescribed crack width and the load at the moment of total fracture.

Losses in partially prestressed concrete

1988 ◽  
Vol 15 (5) ◽  
pp. 890-899
Author(s):  
B. DeV. Batchelor ◽  
Jayanth Srinivasan ◽  
Mark F. Green
Keyword(s):  
Key Words ◽  
Prestressed Concrete ◽  
Effective Modulus ◽  
Highway Bridge ◽  
Design Code ◽  
Bridge Design ◽  
Prestress Losses ◽  
Concrete Members ◽  
Modulus Method

The calculation of prestress losses by the age-adjusted effective modulus method is analyzed and compared with the Ontario highway bridge design code predictions for partially prestressed concrete. Specifically, the effect of nonprestressed reinforcement on prestress losses is studied. The age-adjusted effective modulus method for calculating prestress losses is outlined, and plots of prestress losses versus partial prestressing ratio are presented and analyzed. It is shown that prestress losses decrease with increasing amounts of nonprestressed reinforcement. Also, the Ontario highway bridge design code expressions, which are intended for use with fully prestressed sections, are not suitable for use in the design of partially prestressed concrete members. Key words: concrete (prestress), design, partial prestressing, prestress losses.

Calculation of Crack Width of Steel-Concrete Composite Beam Prestressed with Internal Tendons

2014 ◽  
Vol 889-890 ◽  
pp. 1445-1449
Author(s):  
Shuan Jiang ◽  
Li Li Bai ◽  
Wei Chen Xue
Keyword(s):  
Prestressed Concrete ◽  
Composite Beam ◽  
Crack Width ◽  
Concrete Slab ◽  
Test Results ◽  
Shear Connectors ◽  
Slab Width ◽  
Current Design ◽  
Negative Moment ◽  
Average Crack

Steel-concrete composite beam prestressed with internal tendons (SCCPIT) is composed of prestressed concrete slab, steel beam and shear connectors, etc. At present, there is no calculation formula for crack width of SCCPIT in current design codes like European standard Eurocode 4 or American code ASSHTO LERD Bridge Design Specification (2004). In this paper, calculation formulas for crack width of nonprestressed steel-concrete composite beam provided in Code for Design of SteelConcrete Composite Structure (DL/T 50851999) were adopted as a basis for modification. On the basis of available test results, calculation formulas for uneven coefficient of reinforcement strain and average crack space were modified by consideration of concrete slab width and combined force ratio. Hence, empirical calculation formulas for crack width of SCCPIT under negative moment were proposed. In order to verify accuracy of proposed formulas, available test results including results of five simply supported SCCPITs previously conducted by author were introduced, and comparisons indicated that calculated values were in good agreement with test results.

Study on Corroded Detection of Bridge Prestressed Reinforcement Based on the Magnetic Flux Leakage Method

2011 ◽  
Vol 105-107 ◽  
pp. 1241-1244
Author(s):  
Jun Zhao ◽  
Di Tao Niu
Keyword(s):  
Prestressed Concrete ◽  
Concrete Structure ◽  
Load Capacity ◽  
Concrete Surface ◽  
Loss Ratio ◽  
Testing Method ◽  
Concrete Members ◽  
Prestressed Reinforcement ◽  
Flux Leakage ◽  
Ordinary Steel

As the pretressed reinforcement of prestressed concrete structure leads to rust, it would bring serious disadvantage effect to load capacity of the concrete members and reduce the reliability of all concrete structure greatly more than that of ordinary steel caused. If the prestressed reinforcement can be detected in time, the prestressed concrete structure would be got effective maintenance. In the paper, magnetic leakage testing method used in ordinary steel detection is applied to test the simulation corrosion bug of the prestressed reinforcement in bridge with nondestructive mode. The result of experiment indicates that in the distance of 100 mm from the concrete surface the magnetic leakage testing method can detect effectively the loss ratio of cross-section more than 20 percent of a hank of prestressed strands caused by a part of prestressed strands corroded to break. At last, the paper also puts forward the experiment problems in existence and the improvement methods.

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