Download or read book Experimental Evaluation of the Axial Load Behavior of Tied High strength Concrete Columns written by Wen-Hsiung Lin and published by . This book was released on 1996 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Evaluation of the Behavior of Spirally reinforced High strength Concrete Columns written by Annette M. Pieroni and published by . This book was released on 1995 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Normal strength and High strength Concrete Columns Under Cyclic Axial Load and Biaxial Moment written by Mehdi Zarei and published by . This book was released on 2016 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: The technique of using Carbon Fiber Reinforced Polymer (CFRP) materials to repair and strengthen various concrete members has become popular in the structural retrofitting field as an effective way to enhance the strength and ductility of concrete members due to its superior mechanical properties. In this study a method was introduced to study the behavior of concrete columns with and without CFRP jackets under constant axial load and variable lateral load. The lateral load was applied monotonically and cyclically. To predict the behavior of concrete columns under monotonic and cyclic compressive loadings, a computer code was developed to produce the moment-curvature diagram for concrete sections. The moment-curvature diagram was then input in SAP2000 to study the behavior of reinforced concrete columns. The result of this analysis was found to correlate with experimental data well. The behavior of high-strength concrete (HSC) columns having various properties and subjected to a variety of loading conditions has been the topic of considerable investigation. Of particular significance in this area is the behavior of HSC columns under cyclic compressive load with bidirectional eccentricity. For the experimental investigation, tests of six square slender HSC columns were conducted under stroke control to achieve both ascending and descending branches of the load-deformation curves. Analysis of HSC columns subjected to cyclic axial compression with bidirectional eccentricity was approached from the standpoint of a three-dimensional problem. A computer program based on the extended finite segment method and accounting for geometrical nonlinearity has been proposed here to predict the load-deflection curves of HSC columns under cyclical loading. The HSC stress-strain relationship obtained by parametric study and experimental investigation into the behavior of concrete under cyclical load history has been incorporated into the numerical procedure. The presented computer analysis results have been compared with the experimental data, and a satisfactory agreement was attained for both the ascending and descending branches of the load-deformation curves.
Download or read book Strength of High Strength Concrete Columns Under Eccentric Compression written by R. H. Basappa Setty and published by . This book was released on 1995 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research work involved a study of behaviour and strength of eccentrically loaded High Strength Concrete columns. The research comprised experimental and analytical components. With regard to experimental work, twelve columns were manufactured and tested to failure. All columns were rectangular in cross-section with 300 mm x 100 mm as dimensions. The test specimens were loaded about the minor axis. The ratio of longitudinal reinforcement was either 1.47% (4 - 12 mm diameter bars) or 2.2% (6 - 12 mm diameter bars). The lateral reinforcement was in the form of rectangular closed ties made of 6 mm wires (W6). The spacing of ties was generally 50 mm, but, was decreased to 30 mm, at either ends to avoid premature failure.
Download or read book Behaviour of Square High strength Concrete Columns Under Load Reversals written by Wojciech Lipien and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strength and deformation characteristics of 10 square confined high-strength concrete columns were investigated. Properties of columns were selected to allow assessment of the importance of confinement parameters for high-strength concrete columns. The specimens were tested under constant axial compression and incrementally increasing lateral deformation reversals, simulating seismic action. The data indicate that high-strength concrete columns can be confined to behave in a ductile manner. The volumetric ratio of confinement reinforcement required for high strength concrete columns is higher than that required for normal-strength concrete columns, although the spacing requirement does not appear to be a function of concrete strength. Columns confined with higher grade lateral reinforcement require lower volumetric ratios of confinement steel. The arrangement of lateral reinforcement plays an important role on improving deformability. Columns confined with well-distributed longitudinal reinforcement, laterally supported by transverse reinforcement show improved deformability. The volumetric ratio and spacing limitations for these columns need not be as stringent as those required for less favourable steel arrangements. Axial compression reduces column ductility. An analytical investigation was also conducted to assess the applicability of conventional analyses techniques used for normal-strength concrete columns to those made with high-strength concrete. The applicability of a confinement model, based on test data under concentric compression, was verified against experimental data. The results indicate that the confinement model can be employed to columns under combined bending and axial load. Furthermore, moment-curvature relationships obtained by plane section analysis, moment-rotation and force-displacement relationships obtained by integration of curvatures and consideration of column plastic hinging region, as usually done for columns with normal-strength concrete, produce fairly accurate representation of experimentally observed force-deformation relationships. (Abstract shortened by UMI.).
Download or read book An Experimental Study of Combined Bending and Axial Load in Reinforced Concrete Members written by Eivind Hognestad and published by . This book was released on 1950 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behavior and Design of Axially Loaded High strength Composite Columns written by Chʻeng-chih Chʻen and published by . This book was released on 1993 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ACI Structural Journal written by and published by . This book was released on 2009 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behavior of High Strength Concrete Columns Under Axial Load and Cyclic Flexure written by Dharmendra Vallabhbhai Shah and published by . This book was released on 1991 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AASHTO LRFD Bridge Design Guide Specifications for GFRP reinforced Concrete Bridge Decks and Traffic Railings written by and published by AASHTO. This book was released on 2009 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glass fiber reinforced polymer (GFRP) materials have emerged as an alternative material for producing reinforcing bars for concrete structures. GFRP reinforcing bars offer advantages over steel reinforcement due to their noncorrosive nature and nonconductive behavior. Due to other differences in the physical and mechanical behavior of GFRP materials as opposed to steel, unique guidance on the engineering and construction of concrete bridge decks reinforced with GFRP bars is needed. These guide specifications offer a description of the unique material properties of GFRP composite materials as well as provisions for the design and construction of concrete bridge decks and railings reinforced with GFRP reinforcing bars.
Download or read book Experimental Evaluation of Steel Wide flange Columns in Moment resisting Frames Under High Axial Load and Lateral Drift Demands written by Julien Cravero and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Steel moment-resisting frames (MRFs) in seismic regions are designed to concentrate yielding in beams to dissipate the energy released by earthquakes. However, capacity design procedures in North American code provisions (CSA 2009; AISC 2010a) do not systematically prevent plastic deformations from occurring in columns. Under ground motions with a low probability of occurrence, steel columns as part of MRFs may develop plastic hinges which can lead to undesirable frame mechanisms. Due to a limited set of test data, the current modelling guidelines (PEER/ATC 2010; ASCE 2014) provide little guidance and often employ highly conservative component models for nonlinear modelling of steel columns. Thus, ASCE 41-13 (ASCE 2014) considers that a column possesses no plastic rotation capacity when the compressive axial load demands become larger than 50% of the critical load associated with the member. Hence, the seismic behaviour of steel columns needs to be characterized experimentally, in particular for high axial load and lateral drift demands. High axial load demands on columns are common in existing steel frame buildings due to gravity and can be increased by vertical accelerations and/or dynamic overturning effects in the case of end columns. This thesis intends to advance the state of knowledge on the hysteretic behaviour of steel columns with a large-scale testing program. Twelve column specimens utilizing W14 and W16 cross-sections that are typically used in steel MRFs are subjected to diverse axial and lateral loading sequences. Monotonic, symmetric and collapse-consistent loading histories are employed to push the columns far into the inelastic range and to assess their performance until collapse (i.e., point of loss of axial load carrying capacity). The transient effect on end columns within MRFs is also studied. Test results provide unique experimental data characterizing the cyclic behaviour of steel columns through the loss of their axial load carrying capacity. The effect of the local slenderness, the cross-section depth, the applied axial load ratio, the loading history and the steel material on the column performance is discussed. Moreover, test data are compared with pre-test simulation predictions carried out with a continuum finite element and a concentrated plasticity model.The thesis provides valuable insights on column performance under a wide range of seismic inputs, the interaction of axial load and lateral drift demands, strength and stiffness deterioration phenomena occurring at the component level and a failure mode associated with column axial shortening. In particular, experimental results show that all the tested column specimens exhibit an appreciable plastic rotation capacity even when subjected to high axial load demands. These results can serve to refine seismic design code provisions, revisit guidelines for the nonlinear analysis of steel columns and calibrate numerical models, on the basis of the proposed recommendations." --
Download or read book ACMSM25 written by Chien Ming Wang and published by Springer Nature. This book was released on 2019-09-03 with total page 1104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents articles from The Australasian Conference on the Mechanics of Structures and Materials (ACMSM25 held in Brisbane, December 2018), celebrating the 50th anniversary of the conference. First held in Sydney in 1967, it is one of the longest running conferences of its kind, taking place every 2–3 years in Australia or New Zealand. Bringing together international experts and leaders to disseminate recent research findings in the fields of structural mechanics, civil engineering and materials, it offers a forum for participants from around the world to review, discuss and present the latest developments in the broad discipline of mechanics and materials in civil engineering.
Download or read book Performance Evaluation of High strength Concrete Circular Columns Reinforced with GFRP Bars and Spirals written by Mu'taz Almomani and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of fifteen large-scale high-strength concrete (HSC) columns internally reinforced with GFRP bars and spirals are presented in this thesis. The concrete dimensions and reinforcement of the columns satisfied all the minimum requirements of the relevant Canadian standards. The test parameters in this study include reinforcement type (steel or GFRP), spiral pitch (50 or 85 mm), slenderness ratio (14, 20 or 28), the level of axial load eccentricity (60, 90, 120 or 150 mm) and the loading type (axial or flexural loading). The experimental results were then compared to the predictions of the Canadian and American FRP design codes and guidelines. Compared to the GFRP-reinforced concrete (RC) counterpart, the steel-RC specimen achieved a higher axial capacity (7.8%) with very similar behaviour up to the peak load but a more ductile post-peak behaviour. Both spiral pitches were able to provide adequate confinement up to the peak load, however, the smaller pitch was able to provide a more deformable post-peak behaviour. As the slenderness ratio increased, the lateral displacement increased and the lateral and axial stiffness decreased. The effect of increasing axial load eccentricity was more pronounced than the increase in slenderness ratio and resulted in reduced axial and lateral stiffness. The GFRP reinforcement was able to contribute to the carrying load capacity of both the axially-loaded columns and those under flexure. No failure of any bars or spirals was observed with the exception of the shortest column under the least eccentricity. Under flexural loading, the spirals were able to provide adequate confinement at different loading stages until failure. When compared with the experimental results, the examined codes and guidelines were found to be conservative in predicting the capacities of the columns for all loading conditions and slenderness ratios.
Download or read book Behavior of High Strength Concrete and Slender Reinforced Concrete Columns with and Without Steel Fibers written by Lin Showmay Hsu and published by . This book was released on 1992 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of compression tests are conducted on 3 in. by 6 in. cylindrical specimens using a modified testing method that give the complete stress-strain behavior for both plain and fibrous high strength concretes with or without tie confinements. The volume fractions of fiber in the concrete are 0%, 0.5%, 0.75%, and 1.0%, respectively. Empirical equations are proposed herein to represent the complete stress-strain relationships of high strength and high strength fibrous concretes with compressive strength exceeding 10,000 psi. Various parameters are studied and their relationships are experimentally determined. The comparison between the experimental and analytical results shows to have good agreement. The proposed empirical stress-strain equations for high strength and high strength steel fiber concretes are used as material properties to modify the existing computer program of biaxially loaded slender reinforced concrete columns. This computer program evaluates the complete biaxial load-deflection and moment-curvature relationships of slender columns from zero load until failure. A total of nine high strength and five high strength steel fiber slender reinforced concrete columns are tested to compare their experimental load-deformation results with the analytical values derived from the present theoretical studies. A satisfactory agreement is attained for both ascending and descending branches of the load-deformation curves.
Download or read book Proceedings of International Conference on Innovative Technologies for Clean and Sustainable Development ICITCSD 2021 written by Varinder S. Kanwar and published by Springer Nature. This book was released on 2022-04-28 with total page 865 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents select proceedings of the International Conference on Innovative Technologies for Clean and Sustainable Development (ICITCSD – 2021), held at the National Institute of Technical Teachers Training & Research and Chitkara University, Himachal Pradesh, India. It covers several important aspects of sustainable civil engineering practices, dealing with effective waste and material management, natural resources, industrial products, energy, food, transportation and shelter, environmental impact mitigation, waste minimization and management, sustainable infrastructure, and geospatial technology for sustainable and clean environment. Emphasis is placed on conserving and protecting the environment and the natural resource base essential for future development. The book includes case studies and ongoing research work from various fields related to civil engineering presented by academicians, scientists, and researchers. The book also discusses engineering solutions to sustainable development and green design issues. Special emphasis is given on qualitative guidelines for the generation, treatment, handling, transport, disposal, and recycling of wastes. The book is intended as a practice-oriented reference guide for researchers and practitioners. It will be useful for anyone working in sustainable civil engineering and related fields.
Download or read book ACI Materials Journal written by and published by . This book was released on 2002 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behaviour of High Strength Concrete Columns Under Axial Load and Uniaxial Bending written by Natalie Anne Lloyd and published by . This book was released on 1994 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to significant economic and structural advantages associated with the use of high strength concrete in compression members, the application of high strength concrete in columns and core walls is increasing. The advantages of using high strength concrete are well documented. Utilisation of high strength concrete leads to a reduction in column size. However, this results in an increase in slenderness of columns which would otherwise be stocky when built using low strength concrete. In addition, columns are rarely designed for pure axial load yet most research to date has focussed on high strength colurnns subject to concentric compression. Very limited data is available on columns subject to eccentric compression. The present research therefore focussed on slender columns subject to eccentric compression.
