Download or read book The effect of repeat loading upon the bond slip characteristics of concrete reinforcing steel written by Charles Wade Gilbert and published by . This book was released on 1950 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Deformation Porperties on Bond slip Characteristics of Reinforcing Bars written by Ghassan Khaled Jumah and published by . This book was released on 1992 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theory of reinforced concrete is based on stress transfer between steel and concrete. In order for the steel to develop its full yield force in tension, there should be some bond between that steel and the surrounding concrete. With the deformed bars, used in reinforced concrete construction since many decades, the problem of bond was the topic for many research programs dedicated for the investigation of the factors influencing that bond, Some of these factors are : bar size, cover thickness, spacing between embedded bars, and deformation properties of the bar itself. The objective of our research work was to investigate the effect of rib geometry or rib deformation properties on the bond-slip characteristics of deformed reinforcing bars. For that purpose, plain round Grade 60 bars 20.6 mm (0.811 in.) in diameter were machined to simulate #6 bars. Fifty six of these test bars were tested in eccentric pullout tests. The specimen was a concrete block with a 10-in. length and a 12in.xl2in. cross section. The bar was embedded along the 10-in. length and was loaded in tension until failure of the specimen in a V-notch splitting mode, where the test was halted. Such a short embedment length (10 in.^ for the test bar was chosen in order to avoid yielding of the bar and to minimize the difference in tensile stresses between the loaded-end and the free-end of the bar. The load and the free-end slip of the bar was monitored during the test. Seven series of pullout specimens were prepared and tested, and replicates were included to check the reliability of the test setup and the obtained results. In series ONE and FOUR, the main variable was the rib face angle where five rib face angles were investigated, 30, 45, 60, 75, and 90 degrees. The concrete compressive strength in series ONE was 3000 psi while in series SIX, it was 6000 psi. The main variable in series TWO and FIVE was the rib spacing. Five values of rib spacings were investigated, 0.3 in. (0.37 db), 0.35 in. (0.43 dO, 0.4 in. (0.49 db), 0.45 in. (0.55 db), and 0.5 in. (0.62 db). The rib height was investigated in series THREE and SIX with two different concrete compressive strengths, 3000 and 6000 psi respectively. Four values of rib heights were investigated; 0.04 in. (0.05 db), 0.06 in. (0.074 db), 0.08 in. (0.1 db), and 0.1 in. (0.124 db). Based on the test results of the first six series, the values for the variables in the seventh series were decided upon. In this last series, the rib spacing was kept constant and equal to 0.4 in. (0.49 db), and four combinations of rib face angles and rib heights were tested. The first two combinations had a rib face of 45 degrees and two different rib heights, 0.06 in. (0.074 db) and 0.08 in. (0.1 db), while the other two had a rib face angle 60 degrees with two different rib heights, 0.06 in. (0.074db) and 0.08 in. (0.1 db).
Download or read book Characteristics of Reinforced Concrete Bond at High Strain Rates written by Eric Jacques and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the on-going intensity of research in the field of protective structural design, one topic that has been largely ignored in the literature is the effect of high strain rates on the bond between reinforcing steel and the surrounding concrete. Therefore, a comprehensive research program was undertaken to establish the effect of high strain rates on reinforced concrete bond. The experimental research consisted of the construction and testing of fourteen flexural beam-end bond specimens and twenty-five lap-spliced reinforced concrete beams. The physical and material properties of the specimens were selected based on a range of design parameters known to significantly influence bond strength. In order to establish a baseline for comparison, approximately half of the total number of specimens were subjected to static testing, while the remainder were subjected to dynamic loading generated using a shock tube. The strain rates generated using the shock tube were consistent with those obtained for mid- and far-field explosive detonation. Results of the beam-end and lap splice beam tests showed that the flexural behaviour of reinforced concrete was significantly stronger and stiffer when subjected to dynamic loading. Furthermore, the high strain rate bond strength was always greater than the corresponding low strain rate values, yielding an average dynamic increase factor (DIF) applied to ultimate bond strength of 1.28. Analysis of the low and high strain rate test results led to the development of empirical expressions describing the observed strain rate sensitivity of reinforced concrete bond for spliced and developed bars with and without transverse reinforcement. The predictive accuracy of the proposed DIF expressions was assessed against the experimental results and data from the literature. It was found that the dynamic bond strength of reinforced concrete can be predicted with reasonably good accuracy and that the proposed DIF expressions can be used for analysis and design of protective structures. An analytical method was also developed to predict the flexural load-deformation behaviour of reinforced concrete members containing tension lap splices. The analysis incorporated the effect of reinforcement slip through the use of pseudo-material stress-strain relationships, in addition to giving consideration to the effect of high strain rates on bond-slip characteristics and on the material properties of concrete and steel. A comparison of the analytical predictions with experimental data demonstrated that the proposed analysis technique can reasonably predict the flexural response of beams with tension lap splices. The results also demonstrated that the model is equally applicable for use at low- and high-strain rates, such as those generated during blast and impact.
Download or read book Bond slip characteristics of new type concrete reinforcing steel written by Chu-Chin Lee and published by . This book was released on 1950 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bond of Reinforcement in Concrete written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2000-01-01 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In 1993, the CEB Commission 2 Material and Behavior Modelling established the Task Group 2.5 Bond Models. It's terms of reference were ... to write a state-of-art report concerning bond of reinforcement in concrete and later recommend how the knowledge could be applied in practice (Model Code like text proposal)... {This work} covers the first part ... the state-of-art report."--Pref.
Download or read book Bond Between Concrete and Steel Under Repetitive Loading written by Neil Purnell Richards and published by . This book was released on 1942 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Mechanics of Bond and Slip of Deformed Reinforcing Bars in Concrete written by Leroy Albert Lutz and published by . This book was released on 1966 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Repeated Loading on Bond in Reinforced Concrete written by William Philip Simpson and published by . This book was released on 1940 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal written by Municipal School of Technology (Manchester, England) and published by . This book was released on 1912 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Minutes of Proceedings of the Institution of Civil Engineers written by Institution of Civil Engineers (Great Britain) and published by . This book was released on 1912 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. 39-214 (1874/75-1921/22) have a section 2 containing "Other selected papers"; issued separately, 1923-35, as the institution's Selected engineering papers.
Download or read book Significance of Tests and Properties of Concrete and Concrete Aggregates written by and published by ASTM International. This book was released on 1956 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Local Bond Between a Reinforcing Bar and Concrete Under High Intensity Reversed Cyclic Load written by Marcos P. Loizias and published by . This book was released on 1983 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Concrete Types and Loading Conditions on Local Bond slip Relationships written by Andrew D. Cowell and published by . This book was released on 1982 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Local Bond Between a Reinforcing Bar and Concrete Under High Intensity Cyclic Load written by Siripong Hungspreug and published by . This book was released on 1981 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Transverse Reinforcement on Bond Strength of Reinfocement in Silica Fume Concrete written by Mahmoud Farouk Machaka and published by . This book was released on 1997 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of silica fume has been steadily increasing all over the world as designers utilize the resulting high performance concrete (HPC) to increase the concrete compressive strength and to reduce or eliminate durability problems such as sulfate attack and corrosion. Very few researchers investigated the effect of silica fume on bond-slip characteristics of deformed bars in high performance concrete. Researchers who worked on this topic like Itani and Azizinamini, concluded that the presence of silica fume reduced the bond strength and induced a brittle mode of failure. They suggested the use of transverse reinforcement over the splice region in order to increase the bond strength and provide a ductile mode of failure. The objectives of the proposed research program were to investigate the effect of transverse reinforcement on the bond-slip characteristics of tension lap splices in high performance silica fume concrete, to study the validity of the upper limit of 70 MPa (10,000 psi) imposed by the ACI Building Code 318-95 on the concrete compressive strength for determination of development length, and to evaluate the reliability of the empirical equation of Orangun, Jirsa, and Breen in estimating the bond strength of deformed bars embedded in high strength concrete. Twelve beam specimens were tested. Each beam specimen included two bars in tension, spliced at the center of the span. The beams were designed in way that bars would fail in bond, splitting the concrete cover in the splice region, before reaching the yield point. The beams were loaded in positive bending with the splice in a constant moment region. The variables used were the percentage replacement by weight of cement by silica fume and the amount of confinement over the splice region. Test results indicated that silica fume decreased the bond strength and that specimens containing silica fume but without any transverse reinforcement in the splice region had a brittle, sudden and noisy mode of failure. The use of transverse reinforcement in the splice region increased the bond strength and the ductility of the mode of failure of the beam specimens. Minimum amounts of transverse reinforcement were recommended.
Download or read book Technology written by Manchester (Greater Manchester) College of Science and Technology and published by . This book was released on 1912 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ACI Materials Journal written by and published by . This book was released on 1991 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt:
