Download or read book Behaviour of Coupling Beams Under Load Reversals written by Portland Cement Association. Research and Development. Construction Technology Laboratories and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behavior of Coupling Beams Under Load Reversals written by and published by . This book was released on 1980 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behaviour of Reinforced Concrete Beams Under Load Reversals written by Sait Toprak and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behavior of Coupling Beams Under Land Reversals written by G. B. Barney and published by . This book was released on 1980 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behaviour of Reinforced Concrete Beam column Joints Subjected to Slow Load Reversals written by S. M. Uzumeri and published by Department of Civil Engineering, University of Toronto. This book was released on 1974 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Methods for Seismic Performance Evaluation of Building Structures written by Sang Whan Han and published by MDPI. This book was released on 2021-01-21 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Special Issue was created to collect the most recent and novel research on seismic performance evaluation of building structures. This issue includes three important topics on seismic engineering for building structures: (1) seismic design and performance evaluation, (2) structural dynamics, and (3) seismic hazard and risk analysis. To protect building structures from earthquakes, it is necessary to conduct seismic performance evaluations on structures with reliable methods and to retrofit these structures appropriately using the results of the seismic performance evaluation.
Download or read book Nonlinear Behaviour of Reinforced Concrete Coupling Beams written by 趙作周 and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Coupling Beam Axial Restraint on Analysis and Design of Reinforced Concrete Coupled Walls written by Kamiar Kalbasi Anaraki and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reinforced concrete coupled shear walls are effective systems for resisting lateral loads, often used in mid to high-rise buildings in earthquake-prone areas. These walls usually feature openings for doors and windows, dividing a solid wall into two separate piers. The strength of these walls comes not just from the sum of two individual piers, but from wall piers cross-section and the framing action between the wall piers through the coupling beams. In an earthquake, coupling beams serve as fuse elements, distributing seismic energy throughout the height of the building. This not only reduces the bending stress at the base of the shear walls but also improves their overall strength, stiffness, and resistance to lateral forces. Properly designed coupling beams, with sufficient longitudinal, diagonal, and confinement reinforcement, can effectively absorb energy while maintaining significant strength and stiffness, even under large deformations.The objective of this study was to develop, calibrate, and validate a new coupling beam model that integrates axial and lateral interactions under cyclic loading conditions. This model aims to reliably predict the elastic and inelastic responses of diagonally reinforced coupling beam elements. The proposed analytical model incorporates a fiber-based concrete cross-section, and diagonal trusses to account for axial interactions between the nonlinearity in the steel and concrete along the beam's length. This feature allows the model to capture additional axial force developed in the element due to the axial restraint from the wall piers, thereby increasing or decreasing the lateral strength of the beam. Additionally, the model includes the slip-extension behavior between the coupling beam and the supporting wall through zero-length fiber-based elements at both ends of the beam. Finally, with the development of the new analytical model and recent advancements in understanding the shear strength of RC shear walls, a new coupled/core wall design approach has been introduced to optimize the design of RC core walls. A variety of archetypes have been designed, based on both current design practices and the proposed approach. Detailed analytical models have been developed, and the efficiency of the proposed design has been evaluated through nonlinear static and dynamic analyses. To conduct the dynamic analysis, suites of ground motions were selected using the CMS approach and scaled to the MCER level of hazard. It has been demonstrated that the designed archetypes based on proposed procedure provide a more reliable shear responses under seismic loading compared to current design practices.
Download or read book Experimental Study of Reinforced Concrete Coupling Beams with Axial Restraint written by Bahaa Ahmad Burhan Al-Khateeb and published by . This book was released on 2021 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Computational Modeling of Conventionally Reinforced Concrete Coupling Beams written by Ajay Seshadri Shastri and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Behaviour of Reinforced Concrete Beams Under Combined Moment and Shear Reversal written by Mehmet Çelebi and published by . This book was released on 1973 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Behaviour of Reinforced Concrete Coupling Beams written by Zuozhou Zhao and published by . This book was released on 2001 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EPMESC VII written by E. Arantes e Oliveira and published by Elsevier. This book was released on 2012-12-02 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first EPMESC Conference took place in 1985. It was during the Conference, recognising the success it had been, that the promoters decided to organise other EPMESC conferences, giving birth to a new series of international meetings devoted to computational methods in engineering. The variety of subjects covered by the papers submitted to the 7th Conference demonstrates how much computational methods expanded and became richer in their applications to Science and Technology. New paradigms are being cultivated as non-numerical applications started to compete with the more traditional numerical ones. The scientific and technological communities to which the EPMESC Conferences used to be addressed themselves have changed.The two-volume Proceedings that we achieved to gather represent many of the interesting developments that are taking place, not only in the Asia Pacific Region, but also in some other scientifically advanced parts of the World, and cover a vast list of subjects grouped under the following headings: Applied Mathematics; Physics and Materials Science; Solid Mechanics; Finite Element and Boundary Element Methods; Structural Analysis; Structural Dynamics and Earthquake Engineering; Structural Engineering; Reinforced Concrete; Knowledge-Based Systems; Artificial Neural Networks and Genetic Algorithms; Computer-Aided Instruction; Computer-Aided Design and Computer-Aided Engineering; Geographic Information Systems; Environmental Applications; Road Engineering; Geotechnics; Soil Mechanics; Fluid Mechanics and Hydraulics.Two hundred and fifty one summaries were accepted, many of them with comments and restrictions, by the Programme Committee.From these, 153 papers resulted, many of them from Portuguese and Chinese origin, that were submitted to the revision of an international panel of referees from Australia, Belgium, Brazil, China, Italy, Macao, Portugal, Switzerland, United Kingdom and United States, to which we gladly acknowledge our gratitude and appreciation.
Download or read book Effect of Hoop Spacing on the Seismic Response of Coupling Beams written by Nicholas Adomat and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Coupled walls are among the most commonly used seismic force resisting systems within mid-to-high rise reinforced concrete structures in Canada. Coupling beams are a crucial component of the coupled wall system due to their effective energy dissipation capabilities and high ductility. In situations where coupling beams have a span-to-depth ratio greater than 4.0, conventional longitudinal reinforcement and transverse hoops are typically used to resist the applied moments and shear forces. The 2014 version of the CSA A23.3 Standard provides specific hoop spacing requirements which help ensure that flexural members subjected to seismic loading are designed to avoid brittle failure modes. However, these hoop spacing requirements are identical for both ductile and moderately ductile flexural members. As ductile and moderately ductile systems are meant to have significantly different energy dissipation capabilities and inelastic behaviour, a differentiation in hoop spacing between these two systems is proposed. Specifically, this differentiation would be accomplished by a relaxation in hoop spacing requirements for moderately ductile members as well as stricter hoop spacing requirements for ductile members. In order to investigate the validity of this proposal, four coupling beam specimens with varying ductility and hoop spacing were subjected to reversed cyclic loading. The performance of the coupling beams was based on the following metrics: predicted capacity and maximum load achieved, displacement ductility, cumulative energy dissipation, stiffness degradation, and load sustainability. In addition to the coupling beam specimens, reversed cyclic tests were carried out on "bare" 15M, 20M, and 25M reinforcing steel specimens. The results of the "bare" bar tests were used to provide insight on how the unbraced length of reinforcement affects buckling.The hysteretic response of the coupling beam specimens showed that a relaxation in hoop spacing requirements for moderately ductile members may be possible. In terms of the ductile specimens, the current hoop spacing requirements seem appropriate. It is suggested that further research be carried out in this area to confirm the validity of the results. " --
Download or read book Canadian Journal of Civil Engineering written by and published by . This book was released on 1989 with total page 1034 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Next Generation of Coupling Beams written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of experimental, parametric, and analytical studies was carried out to further the understanding of the behavior and constructability of coupled core wall (CCW) systems. Issues related to the design of wall piers in CCW systems and the beams used to couple the wall piers, structural response of the overall system, and construction difficulties arising from reinforcing steel congestion were explored. The research presented in this document focuses on a design approach of coupled core wall systems which concentrates on minimizing steel congestion while maintaining satisfactory structural behavior. To investigate the overall structural behavior of coupled core wall systems with wall piers and coupling beams designed based on the recommendations of this research, nonlinear time-history analyses were performed on two prototype structures. Both structures had the same plan dimensions, number of stories, slab thickness, wall thickness, and floor-to-floor heights. The first structure was designed using a steel coupling beam, and the second was designed using a diagonally-reinforced concrete coupling beam. The need for special boundary elements in the wall piers was based on maximum concrete compressive strains at design loads. Properties of the coupling beams used in the analyses of the two structures were based on measured behavior obtained during the experimental phase of the research.
Download or read book Characterization of Replaceable Steel Coupling Beam Behavior Using a Computational Parametric Study written by Jared Alan Long and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
