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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 : 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 : 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 : Mianheng Lai
Publisher :
ISBN 13 : 9781361013687
Total Pages : pages
Book Rating : 4.0/5 (136 download)
Download or read book Behaviour of Cfst Columns with External Confinement Under Uni-Axial Compression written by Mianheng Lai 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, "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 : 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 :
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 : 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 : Abdulaziz Lazkani
Publisher :
ISBN 13 :
Total Pages : 268 pages
Book Rating : 4.:/5 (11 download)
Download or read book Behavior of Expansive Concrete-filled Steel Tubular (EcfSt) Columns Under Axial Loadings written by Abdulaziz Lazkani and published by . This book was released on 2016 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete-filled steel tubes (CFST) have been introduced in high-rise buildings in order to expedite construction and increase the confinement of concrete by the steel tube, and hence increase the capacity of the column cross-section. More recently, expansive additives (EAs) that counteract the shrinkage of concrete have been used in CFST to improve the bond between the concrete and steel tube. Although changing the confinement level exerted by the steel tube on concrete will have an impact on the behavior of CFSTs, little information is available regarding the influence of EAs on the mechanical characteristics of expansive concrete-filled steel tubular (ECFST) columns. The objective of this study is thus twofold: (i) to experimentally assess the behavior of concentrically loaded ECFSTs with different parameters, and (ii) to investigate the correlation between the test results and those obtained from different analytical modeling techniques and previous prediction approaches. The experimental program of this study consists of testing 16 CFST/ECFST columns. Fourteen concrete mixes are prepared with four different concrete strength values (16, 40, 50 and 90 MPa), four EA dosages (0%, 6%, 12% and 24%), and two concrete mixing approaches. Steel tubes in two different diameters (89.6 and 153.6 mm), thicknesses (2 and 3 mm), and lengths (370 and 1500 mm) are fabricated. In order to arrive at an effective prestressing action during the hardening process of concrete, two end plates are tied to each ECFST specimen immediately after casting. Each of the tested specimens is effectively instrumented using four LVDTs and several strain gauges. The behavior of the tested column specimens and those collected from previous studies is also assessed using two numerical modeling techniques, namely the fiber-based modeling (FBM) and finite element method (FEM), as well as using several prediction approaches. The results indicate that increasing the concrete strength significantly improves the axial load capacity of CFST columns by up to 76%. Using EA with a concrete strength of 40 MPa results in the most pronounced improvements in the axial load capacity of columns, whilst the most promising EA dosage for the ECFST short columns is 6%.Good agreement is observed between the experimental results and those obtained fromboth FBM and FEM in terms of ultimate load capacity, and hence the adopted modeling techniques can be used in further parametric studies on CFSTs/ECFSTs. It is also recommended to employ specific confined concrete models with the predictive approaches of Euro code 4 and AISC to arrive at the best correlation with CFST test results. This study provides insights into the behavior of pre-stressing CFST columns and presents test results with diverse parameters that contribute to filling gaps in the existing research, verify computational models and provide support for the development of prediction approaches for ECFSTs.
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 : 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 : Mostafa Fahmi Hassanein
Publisher : Elsevier
ISBN 13 : 0443152292
Total Pages : 360 pages
Book Rating : 4.4/5 (431 download)
Download or read book Concrete-Filled Double-Skin Steel Tubular Columns written by Mostafa Fahmi Hassanein and published by Elsevier. This book was released on 2023-02-16 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete-Filled Double-Skin Steel Tubular Columns: Behavior and Design provides a thorough review of the recent advances on the behaviour and design of concrete-filled double-skin steel tubular (CFDST) columns. Drawing on their extensive knowledge and research, the authors cover topics such as different CFDST columns under axial compression, innovative techniques including the use of rubberised concrete, columns with different cross-sections, and steel material envelops and failure modes. This book is an overview of research carried out by this highly experienced and leading research group with specialist knowledge in the topic. It is an invaluable resource for researchers, graduates and post-graduate civil engineers and civil engineering designers. Provides a comprehensive overview of advances on the behaviour and design of concrete-filled double-skin steel tubular (CFDST) columns over the past decade Gives deep-dive explanation of important concepts such as the void ratio which makes these girders different from conventional concrete-filled steel tubular (CFST) columns Explains the failure modes of short and slender columns under compression, with detailed illustrations and photos from both real-life and virtual tests performed by the authors Presents in-depth analysis of the ultimate strengths of CFDST columns with different steel envelops and concrete infills Makes a detailed comparison with available international codes, such as Eurocode 3, and provides recommendations for future studies Discusses new innovative confining stress-based design for different types of CFDST short columns
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.
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 : 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 : Jiongyi Zhu
Publisher :
ISBN 13 :
Total Pages : 220 pages
Book Rating : 4.:/5 (18 download)
Download or read book Structural Behaviour of Octagonal Concrete-filled Steel Tubular Stub Columns Under Uniaxial Compression written by Jiongyi Zhu and published by . This book was released on 2019 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Masakazu Masada
Publisher :
ISBN 13 :
Total Pages : 414 pages
Book Rating : 4.:/5 (242 download)
Download or read book The Behavior of Concrete-filled Steel Tubular Short Columns Subjected to Axial Compression written by Masakazu Masada and published by . This book was released on 1990 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yueming Hu
Publisher :
ISBN 13 :
Total Pages : 684 pages
Book Rating : 4.:/5 (727 download)
Download or read book Behaviour and Modelling of FRP-confined Hollow and Concrete-filled Steel Tubular Columns written by Yueming Hu and published by . This book was released on 2010 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
