Normal Strength And High Strength Concrete Columns Under Cyclic Axial Load And Biaxial Moment
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Normal Strength And High Strength Concrete Columns Under Cyclic Axial Load And Biaxial Moment
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Author : Mehdi Zarei
language : en
Publisher:
Release Date : 2016
Normal Strength And High Strength Concrete Columns Under Cyclic Axial Load And Biaxial Moment written by Mehdi Zarei and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
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.
Design Examples For High Strength Steel Reinforced Concrete Columns
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Author : Sing-Ping Chiew
language : en
Publisher: CRC Press
Release Date : 2018-04-17
Design Examples For High Strength Steel Reinforced Concrete Columns written by Sing-Ping Chiew and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-04-17 with Technology & Engineering categories.
This book is the companion volume to Design of High Strength Steel Reinforced Concrete Columns – A Eurocode 4 Approach. This book provides a large number of worked examples for the design of high strength steel reinforced concrete (SRC) columns. It is based on the Eurocode 4 approach, but goes beyond this to give much needed guidance on the narrower range of permitted concrete and steel material strengths in comparison to EC2 and EC3, and the better ductility and buckling resistance of SRC columns compared to steel or reinforced concrete. Special considerations are given to resistance calculations that maximize the full strength of the materials, with concrete cylinder strength up to 90 N/mm2, yield strength of structural steel up to 690 N/mm2 and yield strength of reinforcing steel up to 600 N/mm2 respectively. These examples build on the design principles set out in the companion volume, allowing the readers to practice and understand the EC4 methodology easily. Structural engineers and designers who are familiar with basic EC4 design should find these design examples particularly helpful, whilst engineering undergraduate and graduate students who are studying composite steel concrete design and construction should easily gain further understanding from working through the worked examples which are set out in a step-by-step clearly fashion.
Strength Of High Strength Concrete Columns Under Eccentric Compression
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Author : R. H. Basappa Setty
language : en
Publisher:
Release Date : 1995
Strength Of High Strength Concrete Columns Under Eccentric Compression written by R. H. Basappa Setty and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Columns, Concrete categories.
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.
Ultimate Strength Of Reinforced Concrete Columns Under Axial Load And Biaxial Bending
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Author : Sisir Kumar Sen Gupta
language : en
Publisher:
Release Date : 1967
Ultimate Strength Of Reinforced Concrete Columns Under Axial Load And Biaxial Bending written by Sisir Kumar Sen Gupta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Reinforced concrete categories.
Behaviour Of High Strength Concrete Columns Under Axial Load And Uniaxial Bending
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Author : Natalie Anne Lloyd
language : en
Publisher:
Release Date : 1994
Behaviour Of High Strength Concrete Columns Under Axial Load And Uniaxial Bending written by Natalie Anne Lloyd and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
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.
Behaviour Of Square High Strength Concrete Columns Under Load Reversals
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Author : Wojciech Lipien
language : en
Publisher:
Release Date : 1996
Behaviour Of Square High Strength Concrete Columns Under Load Reversals written by Wojciech Lipien and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
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.).
Seismic Resistance Of Concrete Filled Square Steel Hollow Structuralsection Beam Columns
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Author : Made S. Hardika
language : en
Publisher:
Release Date : 2002
Seismic Resistance Of Concrete Filled Square Steel Hollow Structuralsection Beam Columns written by Made S. Hardika and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
This thesis describes a research program designed to investigate the seismic performance of square concrete-filled tubular (CFT) columns subjected to a combination of axial load and biaxial bending moment. The square CFT columns included normal strength and high-strength concrete-filled square steel hollow structural section columns with two ratios of tube wall thickness to tube dimension. An extensive experimental program included testing twenty-four, concrete filled, square steel hollow structural section column specimens under constant axial compressive load and cyclic horizontal load with horizontal displacement control. This experimental investigation included strength capacity, ductility and flexural stiffness of CFT beam-columns for 203 x 203 x 9.5 HSS (Class 1, compact sections) and 203 x 203 x 4.8 (Class 4, slender sections) hollow structural section (HSS) filled with either normal strength or high strength concrete. Class 1 (compact) and Class 4 (slender) HSS CFT columns subjected to constant axial load and cyclic shear displacements exhibited excellent hysteresis behavior using either normal strength concrete or high strength concrete. No premature failure, local buckling before yielding, was observed for either Class 1 or Class 4 HSS CFT columns. The drift ratios exceeded 7%. The moment capacities of HSS CFT columns loaded with the plane of bending across the diagonal were only slightly less than those loaded with the plane of bending parallel to the square side. This reduces the need for elaborate procedures to calculate the biaxial moment capacities at orientations between 0 and 45°. The strength capacity of square HSS CFT columns subjected to constant axial compressive load and biaxial cyclic bending moment can be conservatively calculated by column section analysis using fully plastic behavior for both concrete and steel. Strength modification factors alpha1 and alpha 2 accommodate confinement and seismic loading, fast concrete strain rates, effects on the CFT column sections and softening of the columns caused by large axial load. Flexural stiffness of square HSS CFT columns can be calculated using the ACI 318-99 flexural stiffness formula with modification to the coefficient of the flexural stiffness contributed by the concrete.
Inelastic Design Of Reinforced
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Author : Ching-Ming Johnny Ho
language : en
Publisher: Open Dissertation Press
Release Date : 2017-01-27
Inelastic Design Of Reinforced written by Ching-Ming Johnny Ho and has been published by Open Dissertation Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-27 with Technology & Engineering categories.
This dissertation, "Inelastic Design of Reinforced Concrete Beams and Limited Ductile High-strength Concrete Columns" by Ching-ming, Johnny, Ho, 何正銘, 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 INELASTIC DESIGN OF REINFORCED CONCRETE BEAMS AND LIMITED DUCTILE HIGH-STRENGTH CONCRETE COLUMNS submitted by Ho Ching Ming Johnny for the degree of Doctor of Philosophy at The University of Hong Kong in January 2003 This thesis studies the inelastic analysis and design of normal- and high-strength reinforced concrete beams and high-strength reinforced concrete columns. Particular attention is given to the proposed design method of limited ductile high-strength reinforced concrete columns. Analytical studies on normal- and high-strength reinforced concrete beams and experimental research on high-strength reinforced concrete columns are conducted and discussed. To investigate the post-peak behaviour and flexural ductility performance of reinforced concrete beams and columns, the author proposes a new method of rigorous nonlinear moment-curvature analysis that incorporates the strain history effect of tension steel. The moment-curvature curves derived using the new method resemble more closely the actual post-peak behaviour of reinforced concrete members compared to their conventionally-derived counterparts. The results enable the author to derive: (1) a theoretical equation that correlates the curvature ductility factor of reinforced concrete beams to various structural parameters; (2) two sets of design ultimate concrete strains suitable for use with either the proposed equivalent rectangular concrete stress block or the equivalent rectangular stress block of BS 8110; and (3) a series of design charts that facilitates the concurrent design of flexural strength and ductility of reinforced concrete beams. A new parametric study using the proposed analysis method is also conducted to refine the author's previously-proposed equation on transverse steel content of limited ductile high-strength reinforced concrete columns. A series of high-strength reinforced concrete columns containing transverse reinforcement calculated in accordance with this refined equation are tested under compressive axial load and reversed cyclic inelastic displacements to assess its adequacy. These columns prove capable of achieving a curvature ductility factor close to 10, which is the commonly-accepted measure for limited ductile structures. They are subsequently compared with another series of columns containing transverse steel calculated in accordance with the shear requirement of BS 8110. The performance of the latter series is shown to be much worse than the former in terms of flexural strength and ductility. The influence of transverse steel configuration is investigated on some test specimens selected from these two series of columns. In addition, three column specimens are tested to investigate the effect of tension steel lap splice. The test results indicate that the lap splice should be located further away from the potential plastic hinge region. The author also proposes a rational evaluation of plastic hinge length, which could hitherto only be assessed empirically during experimental tests, using various methods that can be grouped into direct and indirect methods. The results are compared with the experimental data obtained from the majority of the column test specimens and with the experimental data obtained by other researchers, and they match closely. To facilitate the design of limited ductile hig
Confinement Study Of High Strength Concrete Columns Under Axial Load
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Author : Dennis Robert Paul
language : en
Publisher:
Release Date : 1991
Confinement Study Of High Strength Concrete Columns Under Axial Load written by Dennis Robert Paul and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Columns, Concrete categories.
Experimental Evaluation Of The Axial Load Behavior Of Tied High Strength Concrete Columns
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Author : Wen-Hsiung Lin
language : en
Publisher:
Release Date : 1996
Experimental Evaluation Of The Axial Load Behavior Of Tied High Strength Concrete Columns written by Wen-Hsiung Lin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Axial loads categories.