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 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 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 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 Seismic Behavior of Coupling Beams with Multi hook Steel Fiber Reinforced Concrete written by Mohamed Al-Tameemi and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic design provisions in the ACI 318-19 Building Code for coupling beams with span-to-depth ratio ranging between 2.0 and 4.0 require to be designed either with heavily-confined diagonal reinforcement proportioned to resist the entire shear demand or as beams in Special Moment Resisting Frames. Although diagonally-reinforced coupling beams are labor-intensive and time-consuming to construct, they are the preferred reinforcement scheme selected by design engineers because of their seismic performance and higher allowable shear stress. Because of the difficulties associated with constructing diagonally-reinforced coupling beams, researchers and structural engineers paid attention to the use of steel fiber reinforcement to simplify reinforcement detailing in coupling beams. Results from research conducted in the past two decades (Setkit, 2012 and Pe̹rez-Irizarry, 2020) have indicated that it is possible to eliminate diagonal reinforcement in coupling beams with span-to-depth ratio greater than or equal to 2.0 when adding hooked steel fibers to the concrete mix. Three types of single-hook short (1.2 or 1.4 in.) steel fibers, mostly at a fiber volume content of 1.5%, were evaluated, which has imposed a significant limitation in the application of steel fiber reinforced concrete coupling beams. In this study, Twelve large-scale coupling beams were tested under displacement reversals. The coupling beams span-to-depth ratio was either 2.0, 2.25, or 3.0. Test specimens were designed to reach a peak shear stress ranging between 68́(f'c (psi) and 108́(f'c (psi). Two types of double-hook steel fibers, at fiber volume contents of 1.0% or 1.25%, were evaluated. These fibers are almost double the length and diameter of the steel fibers used in past studies. The use of larger fibers leads to a smaller number of fibers for a given fiber volume content, which facilitates concrete mixing and pouring. Further, the production cost of the double-hook steel fibers is less expensive compared to that of the short single-hook steel fibers.
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 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 Nonlinear Behavior of Diagonally Reinforced Coupling Beams written by Hassan, Midhat A. and published by . This book was released on 2004 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Force Deformation Behavior of Conventionally Reinforced Coupling Beams written by Onur Ihtiyar and published by . This book was released on 2006 with total page 484 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 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 Analytical Investigation on the Non linear Behavior of Multi story Walls Using Unbonded Post tensioned Precast Concrete Coupling Beams Under Lateral Loads written by Theresa C. Aragon and published by . This book was released on 2013 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ACI Manual of Concrete Practice written by American Concrete Institute and published by . This book was released on 2007 with total page 1196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1970 with total page 1064 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Earthquake Disaster Simulation of Civil Infrastructures written by Xinzheng Lu and published by Springer Nature. This book was released on 2021-02-01 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first edition of this monograph, presenting accurate and efficient simulations of seismic damage to buildings and cities, has received significant attention from the research community. To keep abreast of the rapid development in recent years, our latest breakthrough achievements have been added to this new edition, including novel resilient structural components, secondary disaster simulations, emergency responses and resilient recovery of communities after earthquake. This edition comprehensively covers a range of numerical modeling approaches, higher performance computation methods, and high fidelity visualization techniques for earthquake disaster simulation of tall buildings and urban areas. It also demonstrates successful engineering applications of the proposed methodologies to typical landmark projects (e.g., Shanghai Tower and CITIC Tower, two of the world's tallest buildings; Beijing CBD and San Francisco Bay Area). Reported in this edition are a collection of about 60 high impact journal publications which have already received high citations.
