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Author : Songchao Zhu
Publisher :
ISBN 13 :
Total Pages : 138 pages
Book Rating : 4.:/5 (174 download)
Download or read book A Study of Bond Deterioration in Reinforced Concrete Beam-column Joints written by Songchao Zhu and published by . This book was released on 1983 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Filip C. Filippou
Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.F/5 ( download)
Download or read book Effects of Bond Deterioration on Hysteretic Behavior of Reinforced Concrete Joints written by Filip C. Filippou and published by . This book was released on 1983 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (614 download)
Download or read book Modeling Bond-slip Deformations in Reinforce Concrete Beam-column Joints written by and published by . This book was released on 2000 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new finite element model for reinforced concrete beam-column joints is proposed. The model considers the effects of bond-slip and shear deformations in the joint panel region. The problems associated with modeling bond-slip of anchored reinforcing bars are discussed. The proposed bond-slip model is examined at the element level by comparing its predictions with other analytical and experimental results. The ability of the model to simulate bond deterioration and eventual pullout of anchored reinforcing bars under severe cyclic excitation is demonstrated. This model is incorporated into the global beam-column joint element. Further comparisons are made between the predictions of the proposed beam-column joint model and other analytical and experimental results under reversed cyclic loading to show the validity of the model to describe the bond-slip behavior of the joints.
Author : Filippos Filippou
Publisher :
ISBN 13 :
Total Pages : 436 pages
Book Rating : 4.:/5 (29 download)
Download or read book Effects of Bond Deterioration on Seismic Response of Reinforced Concrete Frames written by Filippos Filippou and published by . This book was released on 1983 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dejian Shen
Publisher : Springer Nature
ISBN 13 : 9819979846
Total Pages : 394 pages
Book Rating : 4.8/5 (199 download)
Download or read book Seismic Performance of Corroded Reinforced Concrete Structures Retrofitted with FRP written by Dejian Shen and published by Springer Nature. This book was released on with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Timothy Adikah
Publisher :
ISBN 13 : 9783659880704
Total Pages : 84 pages
Book Rating : 4.8/5 (87 download)
Download or read book Effect of Corrosion on Reinforced Concrete Structures written by Timothy Adikah and published by . This book was released on 2016-05-19 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kurt Paul Katsumata
Publisher :
ISBN 13 :
Total Pages : 396 pages
Book Rating : 4.:/5 (16 download)
Download or read book Bond Strength of Steel Fiber Reinforced Concrete Under Cyclical Loads written by Kurt Paul Katsumata and published by . This book was released on 1983 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert B. Lotus
Publisher :
ISBN 13 : 9781124677545
Total Pages : 158 pages
Book Rating : 4.6/5 (775 download)
Download or read book State-of-the-art Review of Seismic Behavior of Deficient and Retrofitted Reinforced Concrete Beam Column Joints written by Robert B. Lotus and published by . This book was released on 2011 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beam-column joint is considered a critical region in a structure when subjected to seismic load. Past earthquakes have shown that many of these structures behaved poorly and exhibited a combination of brittle failure at the joint and pullout of the beam longitudinal steel, leading to a rapid degradation of the joint and a precursor to a catastrophic collapse of a structure. Review of existing structures built prior to 1976 have determined concrete joints typically have little or no transverse reinforcement, discontinuous bottom beam reinforcement with insufficient embedment depth, and a common occurrence of column lap splice above the beam-column interface. Previous studies of rebar bond slip behavior, joint shear response, and joint interface - shear response were reviewed culminating in a study of various joint models simulating the behavior of deficient concrete beam-column joint subjected to a seismic load. An experimental test program consisting of three specimens was developed to test the behavior of deficient concrete beam-column joints. Specimen AB1 consists of deficient shear reinforcement at the joint, and will be tested to evaluate the behavior of a deficient reinforced concrete beam-column joint solely on insufficient shear reinforcement. Specimen AB2 is designed according to pre-1976 building standard and lacks sufficient rebar embedment of longitudinal beam reinforcement at the joint and has no shear reinforcement within the joint area. Specimen ACI318 is designed per the specifications of ACI 318-08, and will be used as the control specimen. Experimental results of the test program will eventually be applied as a baseline comparison to proposed state-of-the-art retrofit schemes aimed at enhancing the overall seismic performance of deficient reinforced concrete beam-column joints.
Author : A.P. Goyal
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (428 download)
Download or read book A Study of Ductility of Reinforced Concrete Beam Column Joints written by A.P. Goyal and published by . This book was released on 1969 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : FIB – International Federation for Structural Concrete
Publisher : FIB - Féd. Int. du Béton
ISBN 13 : 2980676225
Total Pages : 650 pages
Book Rating : 4.9/5 (86 download)
Download or read book 10th PhD Symposium in Quebec Canada written by FIB – International Federation for Structural Concrete and published by FIB - Féd. Int. du Béton. This book was released on 2014-07-01 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bassam Khalid Abbas
Publisher :
ISBN 13 :
Total Pages : 296 pages
Book Rating : 4.:/5 (785 download)
Download or read book Moment-rotation Relationship of Reinforced Concrete Beam-column Joints Under Generalized Excitations written by Bassam Khalid Abbas and published by . This book was released on 1988 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study concentrates on two interrelated aspects pertaining to the deformation of beam-column joints under severe cyclic excitations. In the first part of this study, a closed form solution is developed for computing the slip and its distribution along reinforcing steel bars anchored inside a beam-column interior or exterior joint and subjected to generalized boundary steel stress excitations. The main advantage of the developed slip model, under which tremendous computation effort can be saved, is that: 1) it bypasses the local bond stress-slip relationship of unconfined concrete in its descending portion since no reliable experimental data describes this portion, and 2) it ignores the definition of local bond stress-slip relationship under severe load reversals. With its simplicity, the model reproduced quite accurately experimentally observed results and was shown to be in very good agreement with the presumably more accurate finite element prediction models. In the second part of the study, a joint model for describing the moment-rotation relationship of both interior and exterior beam-column joints subjected to inelastic cyclic loading was developed. The model was derived based on idealized hysteretic material models for concrete and for the reinforcing steel bars. Interaction between steel and concrete through bond and slip of reinforcement inside the joint was taken into consideration using the slip model developed in the first part of this investigation. The joint model accounted for the two primary mechanisms responsible for the deformation of the beam relative to the column in the joint. These are: 1) inelastic rotation occurring within an equivalent plastic hinge length extending outside the beam column interface. and more importantly, 2) the fixed-end rotation arising from the slip of reinforcement at the beam-column interface cracks. The joint model allowed prediction of steel stresses and strains, slips, moments, curvatures, inelastic rotation and plastic rotation at any load level during the deformation or load history. Despite some discrepancy, the developed joint model reproduced within a reasonable degree of accuracy the experimentally observed results. On the other hand, with its simplicity in implementation and tremendous efficiency in computation, the developed joint model retained most of the accuracy of results obtained using finite element predictions.
Author : Shuk-Lei Lau
Publisher :
ISBN 13 : 9781361234235
Total Pages : pages
Book Rating : 4.2/5 (342 download)
Download or read book Rehabilitation of Reinforced Concrete Beam-Column Joints Using Glass Fibre Reinforced Polymer Sheets written by Shuk-Lei Lau and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Rehabilitation of Reinforced Concrete Beam-column Joints Using Glass Fibre Reinforced Polymer Sheets" by Shuk-lei, Lau, 劉淑妮, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled REHABILITATION OF REINFORCED CONCRETE BEAM-COLUMN JOINTS USING GLASS FIBRE REINFORCED POLYMER SHEETS Submitted by LAU Shuk Lei For the degree of Master of Philosophy At The University of Hong Kong in August 2005 Shear failure of beam-column joints is one of the main causes of collapse of many moment-resisting reinforced concrete (RC) frame buildings in recent earthquakes. Evidence from recent earthquakes indicates that deficient beam-column joints can jeopardize the integrity of the entire structure. The brittle joint shear failure also significantly reduces the overall ductility of structures, resulting in dangerous failure mechanisms. A variety of techniques have been developed to strengthen beam-column joints. These techniques include the use of steel and concrete jacketing. More than a decade ago, a new technique for strengthening structural elements emerged. This involves the use of fibre-reinforced polymer (FRP) as externally bonded reinforcement in critical regions of RC elements. FRP materials have a number of advantages over steel and concrete that make them an ideal material in strengthening deficient beam-column joints. Most of the FRP-strengthening schemes developed for beam-column joints so far have a limited range of applicability and limitations. The aim of this study is to develop a practical rehabilitation system for strengthening and repairing deficient RC beam-column joints. Two rehabilitation schemes aiming at improving the shear strength of beam-column joints were proposed. Glass fibre-reinforced polymer (GFRP) was adopted in the study because it has a higher fracture strain than carbon fibre. A total of seven half-scale RC beam-column joint specimens were investigated, all without transverse reinforcement in the joint region. Five of them were fabricated and tested in this study, while the other two specimens, which served as reference specimens, were fabricated and tested earlier in a separate study. The five specimens produced in this study were rehabilitated with GFRP composite sheets to evaluate the effectiveness of the rehabilitation schemes. Three of the specimens were tested under reversed cyclic quasi-static loading to simulate the seismic effects on structures, and the other two specimens were tested under monotonic loading. Experimental results illustrated that the GFRP-rehabilitated joints exhibited an improved displacement ductility, a lower rate of strength degradation and a higher cumulative energy dissipation than the reference specimens. The strain reduction in steel reinforcement for the rehabilitated specimens exceeded 45%, demonstrating the efficiency of the external GFRP reinforcement. The importance of reliable anchorage methods in preventing premature delamination of FRP was also addressed. DOI: 10.5353/th_b3200163 Subjects: Concrete construction - Joints Reinforced concrete construction - Repairing Fibrous composites Fiber-reinforced concrete
Author : Brian Forzani
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.:/5 (359 download)
Download or read book Hysteretic Behavior of Lightweight Reinforced Concrete Beam-column Subassemblages written by Brian Forzani and published by . This book was released on 1979 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ghassan Fawaz
Publisher :
ISBN 13 :
Total Pages : 302 pages
Book Rating : 4.:/5 (125 download)
Download or read book Experimental and Analytical Investigations on Bond of Reinforcement and Nonlinear Response of Reinforced Concrete Columns written by Ghassan Fawaz and published by . This book was released on 2020 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bond of reinforcement has a major influence on the behavior of reinforced concrete (RC) structures. Even though bond has been extensively studied over the past decades, there are still a number of knowledge gaps requiring investigation. This dissertation presents three studies related to the basic bond behavior of reinforcement and the influence of bond-slip on the seismic response of RC columns. The first investigation characterizes the bond behavior of iron-based shape-memory alloy (Fe-SMA) bars. Fe-SMA reinforcement provides new opportunities for design and strengthening of concrete structures thanks to their shape memory effect. However, there is currently little data on its bond performance. Experiments were conducted to study the bond-slip behavior of ribbed Fe-SMA bars embedded in concrete specimens with different levels of passive confinement. Fe-SMA bars presented a similar bond performance as conventional reinforcement, but their bond strength was reduced with heat activation in low-confined specimens. An analytical model is also proposed to calculate the transfer length of Fe-SMA bars in prestressing applications. The second investigation proposes nonlinear finite element models to accurately simulate the cyclic response of RC columns, including the effect of bond-slip. Concrete is modeled using a triaxial constitutive model recently proposed in the literature. A commonly used uniaxial steel model is modified to account for low-cycle fatigue rupture using a phenomenological criterion. The bond-slip behavior of bars is modeled using a zero-thickness interface element and a bond stress-slip law that predicts bond deterioration caused by generalized slip demands, tensile yielding of steel, and concrete damage. The proposed models accurately predict the cyclic response and failure of previously tested column components. The third investigation focuses on the effects of strain penetration and bond modification on the lateral response of RC columns. Two large-scale column specimens were tested under cyclic loading. One specimen had conventional reinforcement details, while the other had headed bars that were partially debonded along the footing to alleviate strain concentrations. Both specimens formed plastic hinges and failed due to rupture of longitudinal bars. The specimen with partial debonding presented less damage and a larger deformation capacity. Experimental data indicated that the debonding strategy reduced peak tensile strains, and increased bar slip and fixed-end rotations. However, it also reduced the lateral load resistance of the column. Companion finite element analyses have indicated that the reduction in peak lateral strength is caused by lower steel stress demands when concrete cover fails
Author : Ahmad Soraghi
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)
Download or read book Probabilistic Characterization of Bond Behavior at Rebar-Concrete Interface in Corroded RC Structures written by Ahmad Soraghi and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adequate rebar-concrete bonding is crucial to ensure the reliable performance of reinforced concrete (RC) structures. Many factors (such as the concrete properties, concrete cover depth, transverse reinforcement, and the presence of corrosion) affect the bond behavior, and consequently the structural performance. This bond behavior is typically described by a bond stress-slip relationship, where there are two critical quantities: bond strength ̶ the maximum shear stress that bond can withstand, and peak slip ̶ the slippage at the interface when the bond strength is reached. It is understood that the bond deteriorates when corrosion is present and behaves differently under two distinct bond failure modes (i.e., splitting and pull-out). While many prior studies have focused on the influence of the aforementioned factors on the bond strength, the impact of the failure mode coupled with corrosion on the bond stress-slip relationship and structural performance have not been thoroughly investigated. This study is aimed to address this issue. In this study, first a probabilistic bond failure mode prediction model that considers various influencing factors including loading type and corrosion is developed in this study. This study uses the bond testing results of 132 beam-end specimens subjected to monotonic and cyclic loading and adopts classification methods to develop the prediction model, which is then used to evaluate the impact of bond behavior on the reliability of a RC beam with a lap splice. Then, multivariate nonlinear regression with all-possible subset model selection and symbolic multi-gene regression are adopted for probabilistic model development for bond strength and peak slip under the two bond failure modes considering corrosion. In particular, a comprehensive bond dataset collected from bond tests on the beam and beam-end specimens in the literature and from the experimental testing conducted in this study, and a criterion to specify the bond failure mode is also proposed. Next, incorporating bond in the structural analysis is investigated. Since in reality, perfect bonding does not exist, especially in beam and column or column and footing connections, reinforcement slip occurs as a result of imperfect bonding. Reinforcement slip in the footing of a RC column can significantly influence the lateral displacement of the column, a critical structural response under lateral loads such as seismic loading. Many past researchers studied and developed models to capture the anchorage slip of rebar; however, a model that can reflect the actual bond-slip relationship (especially in the presence of corrosion) and yet be simple-to-use for structural analysis is not well developed. In this study, a new simple bar stress-slip macromodel is developed to predict reinforcement anchorage slip given a rebar stress. The proposed rebar anchorage slip model is derived by implementing a macromodel solution based on a simple bond stress distribution function that captures the bond stress distribution numerically obtained from a real bond-slip relationship. Available experimental bond stress-slip data collected from literature are used to optimize the model parameter in the proposed bond stress distribution function, which reflects the impact of the structural parameters on the rebar slippage such as concrete strength and corrosion level. The proposed rebar slip model is then incorporated into a fiber beam-column model for numerical analysis, and is further validated by comparing flexural behavior of several RC columns (with and without corrosion) based on the numerical model with the experimental data. The results demonstrate the importance of incorporating rebar slippage and corrosion effect on bond. Using this fiber beam-column model, seismic performance of an example RC bridge column is evaluated, and one can conclude the rebar slip plays a critical role in the seismic evaluation. As the proposed rebar slip macromodel provides simple formulation and it is explicitly expressed with a model parameter that can be updated easily to incorporate new information, it is practical for application in the structural analysis.
Author : Comité euro-international du béton
Publisher : Thomas Telford
ISBN 13 : 9780727720856
Total Pages : 328 pages
Book Rating : 4.7/5 (28 download)
Download or read book RC Frames Under Earthquake Loading written by Comité euro-international du béton and published by Thomas Telford. This book was released on 1996 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report examines the behaviour of individual frame members subjected to the cyclic actions arising in seismically loaded frames i.e. slender flexure-dominated beams, short columns and beam-column joints. The report also considers global inelastic frame behaviour and its modelling, and the peculiarities of the behaviour of masonry-filled frames.
Author : Hian-Leng Chan
Publisher :
ISBN 13 :
Total Pages : 216 pages
Book Rating : 4.:/5 (794 download)
Download or read book Detection of Bond Deterioration in Reinforced Concrete Using Active Sensing Technique written by Hian-Leng Chan and published by . This book was released on 2005 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
