Computational Modeling of Conventionally Reinforced Concrete Coupling Beams PDF Download
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Author: Ajay Seshadri Shastri
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Coupling beams are structural elements used to connect two or more shear walls. The most common material used in the construction of coupling beam is reinforced concrete. The use of coupling beams along with shear walls require them to resist large shear forces, while possessing sufficient ductility to dissipate the energy produced due to the lateral loads. This study has been undertaken to produce a computational model to replicate the behavior of conventionally reinforced coupling beams subjected to cyclic loading. The model is developed in the finite element analysis software ABAQUS. The concrete damaged plasticity model was used to simulate the behavior of concrete. A calibration model using a cantilever beam was produced to generate key parameters in the model that are later adapted into modeling of two coupling beams with aspect ratios: 1.5 and 3.6. The geometrical, material, and loading values are adapted from experimental specimens reported in the literature, and the experimental results are then used to validate the computational models. The results like evolution of damage parameter and crack propagation from this study are intended to provide guidance on finite element modeling of conventionally reinforced concrete coupling beams under cyclic lateral loading.
Author: Ajay Seshadri Shastri
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Coupling beams are structural elements used to connect two or more shear walls. The most common material used in the construction of coupling beam is reinforced concrete. The use of coupling beams along with shear walls require them to resist large shear forces, while possessing sufficient ductility to dissipate the energy produced due to the lateral loads. This study has been undertaken to produce a computational model to replicate the behavior of conventionally reinforced coupling beams subjected to cyclic loading. The model is developed in the finite element analysis software ABAQUS. The concrete damaged plasticity model was used to simulate the behavior of concrete. A calibration model using a cantilever beam was produced to generate key parameters in the model that are later adapted into modeling of two coupling beams with aspect ratios: 1.5 and 3.6. The geometrical, material, and loading values are adapted from experimental specimens reported in the literature, and the experimental results are then used to validate the computational models. The results like evolution of damage parameter and crack propagation from this study are intended to provide guidance on finite element modeling of conventionally reinforced concrete coupling beams under cyclic lateral loading.
Author: Günther Meschke
Publisher: CRC Press
ISBN: 100064474X
Category : Technology & Engineering
Languages : en
Pages : 1500
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Book Description
Computational Modelling of Concrete and Concrete Structures contains the contributions to the EURO-C 2022 conference (Vienna, Austria, 23-26 May 2022). The papers review and discuss research advancements and assess the applicability and robustness of methods and models for the analysis and design of concrete, fibre-reinforced and prestressed concrete structures, as well as masonry structures. Recent developments include methods of machine learning, novel discretisation methods, probabilistic models, and consideration of a growing number of micro-structural aspects in multi-scale and multi-physics settings. In addition, trends towards the material scale with new fibres and 3D printable concretes, and life-cycle oriented models for ageing and durability of existing and new concrete infrastructure are clearly visible. Overall computational robustness of numerical predictions and mathematical rigour have further increased, accompanied by careful model validation based on respective experimental programmes. The book will serve as an important reference for both academics and professionals, stimulating new research directions in the field of computational modelling of concrete and its application to the analysis of concrete structures. EURO-C 2022 is the eighth edition of the EURO-C conference series after Innsbruck 1994, Bad Gastein 1998, St. Johann im Pongau 2003, Mayrhofen 2006, Schladming 2010, St. Anton am Arlberg 2014, and Bad Hofgastein 2018. The overarching focus of the conferences is on computational methods and numerical models for the analysis of concrete and concrete structures.
Author: Jared Alan Long
Publisher:
ISBN:
Category : Building, Iron and steel
Languages : en
Pages :
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Book Description
Modern buildings often feature concrete core walls in the design. The use of coupling beams between wall piers has been used to increase the building’s resistance to wind and seismic forces. While different types of coupling beams have been used and researched, they often come with difficulties in construction and the inability to be replaced after a significant lateral loading event. This study explores a new type of replaceable steel coupling beam, using reduced beam section (RBS) cuts, a bolted end-plate wall connection, and the use of two parallel beams. A finite element model was developed and used to model three previous tests on both shear-yielding beams and flexure-yielding beams with RBS cuts. A strong fit between the load-deformation responses of the model and test were observed for the three beams. The model was used to conduct a parametric study of 18 steel end-plate coupling beams, nine with single beams and nine with parallel beams. Results obtained from the study included demands on the wall connection and parameters that influence shear-controlled to flexure-controlled behavior. It was found that the strength of the beams could be predicted within 10.8%, connection elements remained elastic, and two of the 18 modeled specimens produced stresses that would cause crushing of the concrete wall. The use of thicker plates was found to significantly reduce the stress applied to the wall in order to prevent concrete crushing.
Author: Dakota B. Saathoff
Publisher:
ISBN:
Category : Concrete beams
Languages : en
Pages : 0
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Book Description
A database of diagonally reinforced concrete coupling beam tests was formulated and used to assess strength, stiffness, and deformation capacity. The shear strength equation provided in ACI 318-19 considers only the transverse strength of the diagonal bars and was found to be overly conservative. A new equation that includes shear strength of concrete and transverse reinforcement was found to provide a better fit to test data. Existing recommendations were found to underestimate deformation capacity. A plastic hinge model that includes bond slip was formulated to estimate deformation capacity based on strain at crushing of confined concrete and strain at onset of diagonal reinforcement buckling. Favorable agreement was found between the model and test data. An empirical equation based on ratio of diagonal bar diameter to section depth, db/h, and ratio of spacing of transverse reinforcement to diagonal bar diameter, s/db, was fit to data. The empirical equation led to reduced scatter relative to the plastic hinge model. A parametric study was conducted using the plastic hinge model and the empirical equation, and reasonable agreement was found between the two models over this practical range of parameters. New recommendations for determining the deformation capacity of diagonally reinforced concrete coupling beams are provided.
Author: Wai-Yin Lam
Publisher: Open Dissertation Press
ISBN: 9781361429006
Category :
Languages : en
Pages :
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Book Description
This dissertation, "Plate-reinforced Composite Coupling Beams: Experimental and Numerical Studies" by Wai-yin, Lam, 林慧賢, 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 Plate-reinforced Composite Coupling Beams - Experimental and Numerical Studies Submitted by LAM Wai Yin for the degree of Doctor of Philosophy at The University of Hong Kong in October 2006 This thesis reports the results of experimental and numerical studies conducted on innovative plate-reinforced composite (PRC) coupling beams, designed with the objective of providing the construction industry with a feasible alternative coupling beam design that improves the structural performance of coupled shear wall structures under wind and seismic loading. The design of these coupling beams makes use of the composite action between structural steel and reinforced concrete (RC) by embedding a steel plate vertically into a conventional RC coupling beam. Shear studs were welded onto the steel plate surfaces in the beam span and the wall anchorage regions to enhance the plate/RC composite action. These studies build on the results of a previous experimental study conducted by the author on medium-length PRC coupling beams of span/depth ratio (l/h) 2.5. Three medium-length (l/h = 2.5) and three short (l/h = 1.17) PRC coupling beams were tested under reversed cyclic loading conditions. The results have demonstrated the effectiveness of both short and medium-length PRC coupling beams with properly designed plate anchorage in resisting large shear forces and withstanding large inelastic imposed deformations. It was found that shear studs in the wall regions would help to ensure ductile beam performance and desirable energy dissipation ability under seismic deformations, and that their absence would hinder the full strength development of short PRC coupling beams. A general pattern of bearing stress distributions with consistently large bearing stresses near the beam- wall joints and toward the ends of the plate anchors was also derived. i In order to extend the investigations to PRC coupling beams of different geometries and steel contents, so as to develop a comprehensive design procedure for the new type of coupling beams, the two-dimensional non-linear finite element analysis (NLFEA) program ATENA was employed. By introducing discrete bond and shear stud elements as the media for the plate/RC load transfers that allowed for interface slips, selected test specimens were first modelled and the reliability of the program in predicting the beam performances was verified. An extensive parametric study was then conducted on nearly one hundred PRC coupling beam models to investigate the effects of variations in span/depth ratios, reinforcement ratios and plate geometries on the load-rotation response under monotonically increasing loading. The internal load distributions were also investigated and the relationship between different force components on the plate anchors identified. These investigations indicated that if the walls were insufficiently reinforced or the plate anchorage was too short, the result would be the undesirable "strong beam - weak wall" phenomenon. Maximum allowable shear capacities and minimum required plate anchorage lengths were therefore proposed for PRC coupling beams to prevent early failure of wall piers. In the light of the experimental and the numerical observations, a bearing stress distribution model considering vertical and horizontal bearing forces was proposed for the plate anchors. An original and comprehen
Author: Bahaa Ahmad Burhan Al-Khateeb
Publisher:
ISBN:
Category : Concrete beams
Languages : en
Pages : 106
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Book Description
Coupled shear walls are a lateral load resisting system used in buildings to resist seismic and wind loads. In coupled walls, coupling beams span between adjacent shear walls and are typically located at floor level. Coupling beams are designed to yield and form plastic hinges before the wall piers. Damage patterns observed after the 2010-2011 Canterbury earthquake sequence in New Zealand showed instances in which coupled walls did not behave as intended in design, as plastic hinges formed at the base of the wall piers but not at the beam ends. The Canterbury Earthquakes Royal Commission suggested that this undesirable response may have been caused by coupling beam axial restraint from walls and floors increasing the strength of the coupling beams.To better understand the effect of axial restraint on coupling beam behavior, seven one-half-scale reinforced concrete coupling beams were designed using ACI 318-19 and were constructed and tested. The main test variables were span-to-depth ratio, reinforcement configuration (conventional or diagonal), primary reinforcement ratio and bar diameter, and level of axial restraint. Six beams consisted of three identical pairs, with the two beams in each pair tested at a different level of constant stiffness axial restraint.Test results indicated that axial restraint, which is not included in the ACI 318-19 equation for nominal shear strength of diagonally reinforced coupling beams, increased the beam strength. Axial restraint also influenced the load-displacement responses of the beams and the observed damage patterns. The conventionally reinforced beams were observed to yield in shear, while damage concentrated at the ends of the diagonally reinforced beams. The onset of significant strength degradation in the diagonally reinforced beams was associated with buckling of diagonal reinforcement rather than crushing of confined concrete, such that variation in axial compression on identical pairs of beam did not lead to a significant difference in deformation capacity. Test beams with #6 diagonal reinforcement had improved deformation capacity over those with #4 diagonal reinforcement, due to the influence of the ratio of transverse reinforcement spacing to diagonal bar diameter (s/db) on bar buckling.
Author: Shahab Jaberansari
Publisher:
ISBN:
Category :
Languages : en
Pages : 162
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Book Description
Strong wind events are the major factor governing the structural design of many tall buildings in regions with low-to-moderate seismic hazard; however, unlike seismic design, where performance-based design of tall buildings has become common in regions impacted by strong shaking, wind design is still based on linear elastic response under ASCE 7 strength-level demands. Application of performance-based wind design, where modest nonlinear responses are allowed in ductile elements at prescribed locations, has been hampered in part by the lack of experimental data on the performance of key elements subjected to wind loading protocols. For tall concrete buildings subjected to strong wind, allowing modest nonlinearity in coupling beams is an attractive option; therefore, four 2/3-scale reinforced concrete coupling beams were tested under a simulated windstorm loading protocol, which consists of a large number of elastic load cycles and a dozen mildly-inelastic displacement cycles. The test parameters included aspect ratio, presence of floor slab, level of detailing (seismic versus standard), and loading protocol (wind versus seismic). The test results indicate that rotational ductility demands of 1.5 can be achieved with only small residual crack widths (less than 1/16 in.; 1.6 mm) and no concrete spalling or bar buckling, indicating that allowing modest inelastic responses in strong wind may be a viable approach.
Author: Christopher John Motter
Publisher:
ISBN:
Category :
Languages : en
Pages : 344
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Book Description
Reinforced concrete structural walls provide an efficient lateral system for resisting seismic and wind loads. Coupling beams are commonly used to connect adjacent collinear structural walls to enhance building lateral strength and stiffness. Steel-Reinforced Concrete (SRC) coupling beams provide an alternative to reinforced concrete coupling beams, diagonally-reinforced for shorter spans and longitudinally-reinforced for longer spans, and offer potential advantages of reduced section depth, reduced congestion at the wall boundary region, improved degree of coupling for a given beam depth, and improved deformation capacity. Four large-scale, flexure-yielding, cantilever SRC coupling beams embedded into reinforced concrete structural walls were tested by applying quasi-static, reversed-cyclic loading to the coupling beam (shear) and the top of the wall (moment, shear, and constant axial load) to create cyclic tension and compression fields across the embedment region. The primary test variables were the structural steel section embedment length, beam span length (aspect ratio), quantities of wall boundary longitudinal and transverse reinforcement, and applied wall loading (moment, shear, and axial load). Based on test results, long embedment length, sufficient wall boundary reinforcement, and low-to-moderate wall demands across the embedment region are all associated with favorable coupling beam performance, characterized by minimal pinching and strength degradation in the load-deformation response and plastic hinge formation at the beam-wall interface with a lack of damage (plasticity) in the embedment region. The variation in aspect ratio was not found to significantly affect performance. Detailed design and modeling recommendations for steel reinforced concrete (SRC) coupling beams are provided for both code-based (prescriptive) design and alternative (non-prescriptive) design. For both code-based and alternative design, modeling a rigid beam for flexure and shear deformations with rotational springs at the beam-wall interfaces is recommended for stiffness, as test results indicate that the majority of the coupling beam deformations were associated with interface slip/extension. Alternative stiffness modeling recommendations are provided, in which an effective bending stiffness that accounts for the aspect ratio or beam length is used instead of interface rotational springs. A capacity design approach, in which the provided embedment strength exceeds the expected beam strength, is recommended for determining the required embedment length of the steel section into the structural wall. Recommendations for computing the nominal and expected (upper bound) flexure and shear strengths are provided. For alternative design, additional parameters are provided to define the strength and deformation capacity (to complete the backbone relations) and to address cyclic degradation for each of the test beams.
Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 812
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Author: FIB – International Federation for Structural Concrete
Publisher: FIB - Féd. Int. du Béton
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 544
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