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Author : 赖{273430}{27305f}
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (93 download)
Download or read book Behaviour of CFST Columns with External Confinement Under Uni-axial Compression written by 赖{273430}{27305f} and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mianheng Lai
Publisher : Open Dissertation Press
ISBN 13 : 9781361013670
Total Pages : 406 pages
Book Rating : 4.0/5 (136 download)
Download or read book BEHAVIOUR OF CFST COLUMNS W/EX written by Mianheng Lai and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Behaviour of CFST Columns With External Confinement Under Uni-axial Compression" by Mianheng, Lai, 赖{273430}{27305f}, 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: This thesis presents both experimental and theoretical studies on the structural behaviour of externally confined concrete-filled-steel-tube (CFST) short columns under uni-axial compression. External confinement in the form of tie bars, steel rings, spirals and jackets is proposed. From the study, it can be concluded that the external confinement is highly effective in improving the uni-axial behaviour of CFST columns by improving confining stress and suppressing inelastic local buckling. The first part of the thesis covers the experimental behaviour of concentrically loaded confined CFST columns. The experimental programme involved testing a total of 208 specimens that consisted of 46 hollow-steel-tube columns with or without external confinement and CFST columns: 28 unconfined, 25 tie-confined, 77 ring-confined, 24 spiral-confined and 8 jacket-confined columns. The test results are summarized and discussed. From analysing the obtained experimental results, a better understanding of the structural behaviours, such as steel-concrete interface bonding, stress state of steel tube, behaviour of core concrete of CFST columns can be obtained. Besides, the test results obtained are useful for deriving and verifying theoretical models in this study. In the second part of the thesis, a theoretical stress-strain model is proposed based on the obtained test results. This model is obtained through a four-step procedure. As the first crucial step, a new and accurate hoop strain equation is proposed and verified based on experimental results. Having validated the assumption of stress path independence of the core concrete in CFST columns under monotonic uni-axial compression, an actively confined concrete constitutive model is adopted to predict the axial stress-strain response of the core concrete. Next, with the aid of Generalized Hooke's Law and Prandtl-Reuss theory, the complicated stress-state of steel tube is accurately modelled. Lastly, by using the newly proposed hoop strain equation together with the interaction models among the core concrete, steel tube and external confinement, the uni-axial behaviours of CFST columns can be predicted. The validity of this model is subsequently verified with the author's and published experimental results of CFST columns and FRP-confined concrete. Finally, a parametric study using the proposed model is conducted in this thesis, involving a wide range of parameters, i.e. steel tube yield strength, concrete compressive strength, steel ratio (steel tube outer diameter / thickness) and external confinement (types and arrangements). From the parametric study, two sets of critical steel ratios based on two levels of ductility at different steel yield and concrete compressive strengths are established. Moreover, the maximum column strengths of CFST columns obtained from the model and previous experimental studies are compared with the design strengths calculated using different design codes and the results indicate that the design codes cannot give reasonably accurate predictions. Therefore, new design equations are proposed in this thesis to predict the maximum strength of the CFST columns. Subjects: Concrete-filled tubes
Author : 董春宵
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (877 download)
Download or read book Uni-axial Behaviour of Concrete-filled-steel-tubular Columns with External Confinement written by 董春宵 and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chien Ming Wang
Publisher : Springer Nature
ISBN 13 : 9811376034
Total Pages : 1104 pages
Book Rating : 4.8/5 (113 download)
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.
Author : Lie Luo (M. Phil.)
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (828 download)
Download or read book Uni-axial Behavior of Normal-strength Concrete Filled Steel Tubular Columns with External Confinement written by Lie Luo (M. Phil.) and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yi Ouyang
Publisher :
ISBN 13 : 9781361031599
Total Pages : pages
Book Rating : 4.0/5 (315 download)
Download or read book Nonlinear Analysis of Concrete Columns Under Non-Uniform and Anisotropic Confinement written by Yi Ouyang and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Nonlinear Analysis of Concrete Columns Under Non-uniform and Anisotropic Confinement" by Yi, Ouyang, 歐陽禕, 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: For the past twenty years, more and more attention has been drawn to the "performance-based design" of structures due to the concerns of earthquakes, dynamic impact, wind loads and so on. As a result, the ductility of a building has become an important aspect on par with its strength. As far as construction material is concerned, concrete structures have been the most prevalent in these years. As a matter of fact, the ductility of concrete structures is inferior to that of steel structures. However, recent studies have proved that the confinement effect will improve the strength and the ductility of concrete. In traditional concrete construction, confinement is provided by transverse steel hoops placed inside the concrete members with certain spacings, i.e. discontinuously. New forms of concrete structures, such as concrete columns confined by fibre-reinforced polymer (FRP) and concrete-filled steel tubular (CFST) columns, are therefore proposed to enhance the efficiency of confinement, since the concrete in these structures is confined continuously. The mechanisms of uniform and isotropic confinement effect in FRP-confined concrete columns and CFST columns have been well studied, and the existing theoretical models can be applied to those typical load cases, such as FRP-confined circular concrete columns and circular CFST columns under axial compression. But the research on the mechanisms of non-uniform and anisotropic confinement effect is still evolving, in order to predict the behaviour of confined concrete columns with sections of various shapes under combined axial loads and bending moments. Usually finite element (FE) method is used to analyse such complicated problems. However, in a lot of current studies using FE method, the dilation angle of plastic flow of concrete is often treated as a constant, which does not reflect the observed behaviour of concrete regarding the variation of volumetric strain under triaxial compression. In reality, the volume of concrete will eventually expand due to the propagation of splitting cracks, and the true dilatancy of concrete should be non-linear. In this study, a new FE model is developed through Fortran 90 to account for the nonlinearity of the dilatancy of concrete, and verified against several load cases with non-uniform and anisotropic confinement effect, i.e. eccentrically loaded FRP-confined circular concrete columns, axially loaded FRP-confined rectangular concrete columns and eccentrically loaded CFST columns. Moreover, a simplified method is also proposed to provide quick estimations on the behaviour of circular CFST columns under eccentric compression. Subjects: Columns, Concrete - Testing
Author :
Publisher : Research Publishing Service
ISBN 13 : 9810862180
Total Pages : 145 pages
Book Rating : 4.8/5 (18 download)
Download or read book Steel & Composite Structures written by and published by Research Publishing Service. This book was released on 2010 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lie Luo (M. Phil.)
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.:/5 (828 download)
Download or read book Uni-axial Behavior of Normal-strength Concrete Filled Steel Tubular Columns with External Confinement written by Lie Luo (M. Phil.) and published by . This book was released on 2012 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. G. Teng
Publisher : John Wiley & Sons
ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.3/5 (91 download)
Download or read book FRP written by J. G. Teng and published by John Wiley & Sons. This book was released on 2002 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fibre-reinforced polymer (FRP) composites are used to strengthen reinforced concrete (RC) structures. A large amount of research now exists on this. This book brings together all existing research into one volume.
Author : Chong Rong
Publisher : Elsevier
ISBN 13 : 0323853358
Total Pages : 435 pages
Book Rating : 4.3/5 (238 download)
Download or read book Concrete Composite Columns written by Chong Rong and published by Elsevier. This book was released on 2022-11-25 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete Composite Columns: Behavior and Design focuses on confined concrete and establishes analytical methods for each composite column. The volume moves beyond existing resources to study the relationship between existing composite structures and design methods for the sectional form of a concrete composite structure. Chapters cover the failure criteria of concrete, confined concrete types, models, including axial stress prediction, analysis and design-oriented constitutive models, the design and analysis of section form, axial and seismic behaviors of concrete composite columns, the seismic design of concrete composite columns, and the engineering application. This book offers a practical solution to students, researchers, and engineers working with both steel and FRP-confined concrete composite columns. Focuses on confined concrete and provides analytical methods for composite columns Discusses different types of composite columns, including FRP and steel-concrete composites Considers the construction method and confining forces in composite concrete columns Details confined concrete from basic theoretical analysis to seismic behaviors and design methods Provides a solution to students, researchers, and engineers working with confined composite columns
Author : Harsha Kharkwal
Publisher : CABI
ISBN 13 : 1780644477
Total Pages : 218 pages
Book Rating : 4.7/5 (86 download)
Download or read book Natural Polymers for Drug Delivery written by Harsha Kharkwal and published by CABI. This book was released on 2016-12-07 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural polymers have been utilized extensively in food, pharmaceuticals, cosmetics, textiles, oil drilling and paint industries. Their non-toxic and inexpensive attributes readily enhance their commercial acceptability and make them potent agents in lieu of synthetic polymers. This book explores the opportunistic utility of natural polymers in developing effective drug delivery systems and provides a comprehensive and up-to-date analysis of their source, chemical structure and mechanism of action. Covering novel polymers for drug delivery - in particular extracts from plants, microorganisms and proteins, as well as water soluble and water insoluble biodegradable polymers - it presents an encyclopaedic overview of natural polymers'. Natural Polymers for Drug Delivery is an invaluable resource for researchers, students and industrial scientists in the fields of biochemistry, chemistry, pharmacology and food science.
Author : De Sheng Guo
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (684 download)
Download or read book Behaviour of Reinforced Concrete Columns Strengthened by External Prepacked Concrete Jacketing Under Uniaxial Compression written by De Sheng Guo and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zhongya Zhang
Publisher : Frontiers Media SA
ISBN 13 : 2832553672
Total Pages : 222 pages
Book Rating : 4.8/5 (325 download)
Download or read book Recent Advances in Durability Improvement and Low-Carbon Strategy of Engineering Materials and Structures written by Zhongya Zhang and published by Frontiers Media SA. This book was released on 2024-08-28 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Global warming, caused by a significant increase in the concentration of greenhouse gases (GHGs) such as CO2, has become a concern all over the world. The whole process carbon emissions of the civil engineering industry account for nearly 40% of global energy and process-related CO2 emissions, more than half of which come from the process of producing, using, constructing and dismantling in civil engineering materials and structures, resulting in the embodied carbon emissions. With the acceleration of global warming, warmer and uncertain climates will make engineering materials and structures subject to more severe environmental conditions. A series of durability issues will occur more frequently, such as the significant variations of humidity in air, the chloride-induced corrosion caused by the severe chloride ingress, concrete cracking caused by the expansion of rusts, and more severe carbonation of concrete structures due to the increase in CO2 concentration. The adoption of positive measures to address climate change has become a global consensus, as global warming has led to serious threats and challenges to the survival and development of humankind.
Author : Giuseppe Carlo Marano
Publisher : Springer Nature
ISBN 13 : 3030803120
Total Pages : 1127 pages
Book Rating : 4.0/5 (38 download)
Download or read book Proceedings of SECON’21 written by Giuseppe Carlo Marano and published by Springer Nature. This book was released on 2021-09-03 with total page 1127 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers peer-reviewed contributions presented at the International Conference on Structural Engineering and Construction Management (SECON’21), held on 12-15 May 2021. The meeting served as a fertile platform for discussion, sharing sound knowledge and introducing novel ideas on issues related to sustainable construction and design for the future. The respective contributions address various aspects of numerical modeling and simulation in structural engineering, structural dynamics and earthquake engineering, advanced analysis and design of foundations, BIM, building energy management, and technical project management. Accordingly, the book offers a valuable, up-to-date tool and essential overview of the subject for scientists and practitioners alike, and will inspire further investigations and research.
Author : Ashok Kumar Gupta
Publisher : Springer Nature
ISBN 13 : 9811665575
Total Pages : 1041 pages
Book Rating : 4.8/5 (116 download)
Download or read book Advances in Construction Materials and Sustainable Environment written by Ashok Kumar Gupta and published by Springer Nature. This book was released on 2021-12-14 with total page 1041 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select papers presented at the International Conference on Construction Materials and Environment (ICCME 2020). The topics discussed revolve around the identification and utilization of novel construction materials primarily in the areas of structural engineering, geotechnical engineering, transportation engineering, and environmental engineering. The volume presents a compilation of thoroughly studied and utilized sustainable construction materials in different areas of civil engineering. Newly developed testing methodologies, physical modelling methods, numerical studies, and other latest techniques discussed in this book can prove to be useful for researchers and practitioners across the globe.
Author : Le Hoang An
Publisher :
ISBN 13 : 9783737604963
Total Pages : pages
Book Rating : 4.6/5 (49 download)
Download or read book Behavior of Circular Steel Tube Confined UHPC and UHPFRC Columns Under Axial Compression written by Le Hoang An and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Butje Alfonsius Louk Fanggi
Publisher :
ISBN 13 :
Total Pages : 306 pages
Book Rating : 4.:/5 (981 download)
Download or read book Axial Compressive Behavior of FRP-concrete-steel Double-skin Tubular Columns written by Butje Alfonsius Louk Fanggi and published by . This book was released on 2015 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A new type of composite structural system has been proposed in terms of FRP-concrete-steel double-skin tubular columns (DSTCs). This composite system consists of a steel tube inside, an FRP tube outside with concrete in between, and it combines the advantages of all three materials to achieve a high-performance structural member. This thesis is aimed at developing an improved understanding of the axial compressive behavior of DSTCs. To this end, six experimental studies were undertaken at the University of Adelaide. In each of these studies, the key parameters that influence the axial compressive behavior of DSTCs were identified and investigated. The results of these experimental studies indicate that concrete in a DSTC system is confined effectively by FRP and steel tubes. Both the normal-and high-strength concrete DSTCs exhibited a highly ductile compressive behavior under monotonic and cyclic axial compression. However, it is found that, for a given nominal confinement ratio, an increase in the concrete strength results in a decrease in the ultimate axial strain of DSTCs. The results also indicate that increasing the inner steel tube diameter leads to an increase in the ultimate axial stress and strain of concrete in DSTCs. It is observed that the concrete-filling of the inner steel tubes of DSTCs results in an increase in the compressive strength and a slight decrease in the ultimate axial strain of concrete in DSTCs, compared to the values observed in companion specimens with hollow inner steel tubes. It is also observed that cyclically loaded normal-strength concrete (NSC) DSTCs developed similar strength and strain enhancement ratios to those of monotonically loaded NSC DSTCs. The results also show that concrete in hollow DSTCs manufactured with square inner steel tubes develops significantly lower ultimate axial stresses and strains than those of concrete in companion hollow DSTCs with circular inner steel tubes. It is found, however, that the performance of these specimens improves dramatically when the square inner steel tube is filled with concrete. Apart from these experimental studies, this thesis also presents analytical models that were developed to predict the compressive strength and ultimate axial strain of concrete in DSTCs. The first of these models was developed to predict the compressive strength and ultimate axial strain of concrete in hollow circular DSTCs. After undertaking additional studies to expand the test database of square and concrete-filled DSTCs a second model that is applicale both circular and square and hollow and concrete-filled DSTCs was proposed. Comparison with experimental test results show that of the proposed models are in close agreement with the test results, and the models provide improved accuracy compared to the existing models." -- abstract, pages vii-viii.
