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Behavior Of Biaxially And Uniaxially Loaded Short High Strength Concrete Columns Strengthened Using Fiber Reinforced Polymer Laminates
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Book Synopsis Behavior of Biaxially and Uniaxially Loaded Short High Strength Concrete Columns Strengthened Using Fiber Reinforced Polymer Laminates by : Wael Mohammed Mohammed Hassan
Download or read book Behavior of Biaxially and Uniaxially Loaded Short High Strength Concrete Columns Strengthened Using Fiber Reinforced Polymer Laminates written by Wael Mohammed Mohammed Hassan and published by . This book was released on 2004 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Normal-strength and High-strength Concrete Columns Under Cyclic Axial Load and Biaxial Moment by : Mehdi Zarei
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 ICCS21 written by Antonio J.M. Ferreira and published by Società Editrice Esculapio. This book was released on 2018-07-23 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is well-known that the topic of composite mate- rials affects many engineering fields, such as civil, mechanical, aerospace, automotive and chemical. In the last decades, in fact, a huge number of scientific papers concerning these peculiar constituents has been published. Analogously, the industrial progress has been extremely noticeable. The study of composite materials, in general, is a challenging activity since the advancements both in the academia and in the industry provide continually new sparks to develop innovative ideas and applications. The communication, the sharing and the exchange of views can surely help the works of many researchers. This aspect represents the main purpose of this Conference, which aims to collect high-level contributions on the development and the application of composite materials. The establishment of this 21st edition of International Conference on Composite Structures has appeared appropriate to continue what has been begun during the previous editions. ICCS wants to be an occasion for many researchers from each part of the globe to meet and discuss about the recent advancements regarding the use of composite structures, sandwich panels, nanotechnology, bio-composites, delamination and fracture, experimental methods, manufacturing and other countless topics that have filled many sessions during this conference. As a proof of this event, which has taken place in Bologna (Italy), selected plenary and key-note lectures have been collected in the present book.
Book Synopsis Strengthening of Reinforced Concrete Columns Using Composite of Near Surface Mounted Cfrp Strips and Fabric by : Raed Abokwiek
Download or read book Strengthening of Reinforced Concrete Columns Using Composite of Near Surface Mounted Cfrp Strips and Fabric written by Raed Abokwiek and published by . This book was released on 2016 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In this study, the efficiency of using near surface mounted (NSM) carbon fiber reinforced polymer (CFRP) strips with CFRP confinement for strengthening reinforced concrete (RC) columns was investigated. The columns were subjected to concentric load and eccentric load which resulted in uniaxial and biaxial bending. Twenty seven specimens of RC columns with different reinforcement ratios were used. The specimens were divided into three groups; Axial, Uniaxial and Biaxial groups. Each group was subdivided into multiple subgroups with a control un-strengthened specimen. Experimental testing was carried out in order to study the effect of using NSM CFRP strips reinforcement on short columns considering the effect of several parameters. Likewise, the determination of the efficient increase in capacity of the RC columns by varying the number of CFRP strips to be used as reinforcement was studied. Moreover, a comparison was carried out between the efficiency of using NSM CFRP reinforcement with CFRP confinement and without the confinement. Besides, examination of the correlation between the loading pattern, load eccentricity and the effect of NSM CFRP strip on the column capacity was examined. Furthermore, the columns were well instrumented to measure lateral deflection, axial deflection and longitudinal and transverse strains. Failure modes, load-deflections and load-strains relationships were investigated. The strengthened specimens showed a significant increase in the load-carrying capacity and ductility over the control specimens. The increase in the load-carrying capacity for confined columns strengthened with strips in axial, uniaxial and biaxial bending ranged from 36 to 49%, 48 to 95% and 76 to 128%, respectively. The results showed that strengthening RC columns with NSM CFRP composites enhances the capacity and ductility consistently with respect to certain applied eccentricity ratio. In addition, an analytical model to predict the structural behavior of the NSM CFRP strengthened RC columns was developed and presented in this thesis showing fair agreement with the experimental results with deviations ranging from 1 to 18%. Finally, validation of the experimental results against the developed model was done in order to perform future parametric studies and to gain complete understanding of each parameter effect, separately."--Abstract.
Download or read book ACI Materials Journal written by and published by . This book was released on 2004 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior of High Strength Concrete and Slender Reinforced Concrete Columns with and Without Steel Fibers by : Lin Showmay Hsu
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.
Book Synopsis Behavior of L-shaped Reinfoced Concrete Columns Under Combined Biaxial Bending and Compression by : Amar Shah
Download or read book Behavior of L-shaped Reinfoced Concrete Columns Under Combined Biaxial Bending and Compression written by Amar Shah and published by . This book was released on 1984 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combined biaxial and axial compression for L-shaped reinforced concrete short columns is a common design Problem. Current code, provisions and the available design aids do not offer an insight into the determination of strength and ductility of biaxially loaded reinforced concrete column. An experimental and analytical investigation of the moment-deformation behavior of biaxially loaded L-shaped short columns were undertaken. Four 1/2 scaled specimens were tested till failure. Moment-curvature and load-deflection curves were developed from the experimental and the analytical results. The analytical results were obtained using a computer program developed by Hsu (1). From the investigation it is deduced that the computer program developed by Hsu (1) can be used to find the ultimate strength, the moment-deformation characteristics, the stress and the strain distributions across the section of L-shaped, biaxially loaded column with large and small eccentricities.
Book Synopsis Behavior and Design of Short Reinforced Concrete Columns Subjected to Biaxial Loading by : Imeh David A. Udom
Download or read book Behavior and Design of Short Reinforced Concrete Columns Subjected to Biaxial Loading written by Imeh David A. Udom and published by . This book was released on 1983 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior of Slender High Strength Steel Fiber Reinforced Concrete Columns Under Combined Biaxial Bending and Axial Compression by : Tzuoh-Jaw Wu
Download or read book Behavior of Slender High Strength Steel Fiber Reinforced Concrete Columns Under Combined Biaxial Bending and Axial Compression written by Tzuoh-Jaw Wu and published by . This book was released on 1990 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transactions of the American Society of Civil Engineers by : American Society of Civil Engineers
Download or read book Transactions of the American Society of Civil Engineers written by American Society of Civil Engineers and published by . This book was released on 2003 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. 29-30 contain papers of the International Engineering Congress, Chicago, 1893; v. 54, pts. A-F, papers of the International Engineering Congress, St. Louis, 1904.
Book Synopsis Behaviour of High Strength Concrete Columns Under Axial Load and Uniaxial Bending by : Natalie Anne Lloyd
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.
Book Synopsis Behavior of Full-scale Reinforced Concrete Members with External Confinement Or Internal Composite Reinforcement Under Pure Axial Load by : Antonio De Luca
Download or read book Behavior of Full-scale Reinforced Concrete Members with External Confinement Or Internal Composite Reinforcement Under Pure Axial Load written by Antonio De Luca and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The need to satisfy aerospace industry2s demand not met by traditional materials motivated researchers and scientists to look for new solutions. The answer was found in developing new material systems by combining together two or more constituents. Composites, also known as fiber reinforced polymers (FRP) consisting of a reinforcing phase (fibers) embedded into a matrix (polymer), offered several advantages with respect to conventional materials. High specific modulus and strength together with other beneficial properties, corrosion resistance and transparency to electrical and magnetic fields above all, made FRP also suitable for use as construction materials in structural engineering. In the early years of the twenty-first century, the publication by the American Concrete Institute (ACI) of design guidelines for the use of FRP as internal reinforcement and for external strengthening of concrete members accelerated their implementation for structural engineering applications. To date, FRP have gained full acceptance as advanced materials for construction and their use is poised to become as routine as the use of conventional structural materials such as masonry, wood, steel, and concrete. However, new concrete columns internally reinforced with FRP bars and FRP confinement for existing prismatic reinforced concrete (RC) columns have currently important unsolved issues, some of which are addressed in this dissertation defense. The dissertation is articulated on three studies. The first study (Study 1) focuses on RC columns internally reinforced with glass FRP (GFRP) bars; the second (Study 2) on RC prismatic columns externally confined by means of FRP laminates using glass and glass/basalt fibers; and the third (Study 3) is a theoretical attempt to interpret and capture the mechanics of the external FRP confinement of square RC columns. Study 1 describes an experimental campaign on full-scale GFRP RC columns under pure axial load undertaken using specimens with a 24 by 24 in. (0.61 by 0.61 m) square cross section. The study was conducted to investigate whether the compressive behavior of longitudinal GFRP bars impacts the column performance, and to understand the contribution of GFRP ties to the confinement of the concrete core, and to prevent instability of the longitudinal reinforcement. The results showed that the GFRP RC specimens behaved similarly to the steel RC counterpart, while the spacing of the ties strongly influenced the failure mode. Study 2 presents a pilot research that includes laboratory testing of full-scale square and rectangular RC columns externally confined with glass and basalt-glass FRP laminates and subjected to pure axial load. Specimens that are representative of full-scale building columns were designed according to a dated ACI 318 code (i.e., prior to 1970) for gravity loads only. The study was conducted to investigate how the external confinement affects ultimate axial strength and deformation of a prismatic RC column. The results showed that the FRP confinement increases concrete axial strength, but it is more effective in enhancing concrete strain capacity. The discussion of the results includes a comparison with the values obtained using existing constitutive models. Study 3 proposes a new theoretical framework to interpret and capture the physics of the FRP confinement of square RC columns subjected to pure compressive loads. The geometrical, physical and mechanical parameters governing the problem are analyzed and discussed. A single-parameter methodology for predicting the axial stress 6 axial strain curve for FRP-confined square RC columns is described. Fundamentals, basic assumptions and limitations are discussed. A simple design example is also presented.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 2000 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of the Flexural Behavior of Reinforced Concrete Beams Strengthened by Externally Bonded Fiber Reinforced Polymeric (FRP) Laminates by : María del Mar López Acevedo
Download or read book Study of the Flexural Behavior of Reinforced Concrete Beams Strengthened by Externally Bonded Fiber Reinforced Polymeric (FRP) Laminates written by María del Mar López Acevedo and published by . This book was released on 2000 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Short and Slender Concrete Columns Internally Or Externally Reinforced with Longitudinal Fiber-Reinforced Polymer Composites by : Koosha Khorramian
Download or read book Short and Slender Concrete Columns Internally Or Externally Reinforced with Longitudinal Fiber-Reinforced Polymer Composites written by Koosha Khorramian and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this thesis was to investigate the behavior of short and slender concrete columns internally and externally reinforced with longitudinal fiber-reinforced polymer (FRP) composites. The study was divided into two major parts. First part addressed the issues regarding the use of FRP as internal reinforcement for new constructions and the second part focused on external FRP reinforcement for strengthening of existing concrete columns. There is a lack of knowledge and experimental data on the use of longitudinal FRPs as external and internal reinforcement. The contribution of FRP bars in compression is ignored by many design guidelines and the use of longitudinally bonded FRPs in compression is not suggested by guidelines due to lack of experimental test data. There is also lack of knowledge regarding the effect of slenderness and associated parameters (e.g., critical slenderness ratio and flexural stiffness) for the columns. Also, the effectiveness of confinement for eccentrically loaded concrete columns is not well-known. Therefore, this thesis addressed the issues regarding the use of external and internal FRP reinforcement in concrete columns using experimental, analytical, numerical, and statistical approaches. To characterize the compressive behavior of FRP bars as internal reinforcement, three different experimental programs were conducted to include a total of 24 columns, including 10 large-scale and 14 small-scale tests, and 35 compressive FRP bar coupons, in part I of the study. In part II, the use of FRPs as external reinforcement were experimentally assessed by testing a total of 36 column in four different experimental programs, including 6 large-scale tests and 30 small-scale tests. For further investigation, a model was developed in MATLAB for second order analysis of concrete columns reinforced internally or externally with FRPs using one-dimensional finite difference method. The nonlinearity of material and geometry and the effect of eccentricity in confinement were also considered. After required verifications, the model was used to perform a parametric study for different parts of the study and to include 18432 different cases. The model was used for a preliminary reliability-based analysis including 800,000 second-order analysis to assess the reliability corresponding different critical slenderness ratios.
Book Synopsis Experimental Investigation of CFRP Wrapped Square Non-ductile Reinforced Concrete Columns by :
Download or read book Experimental Investigation of CFRP Wrapped Square Non-ductile Reinforced Concrete Columns written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of fiber-reinforced polymers (FRP) for retrofitting or strengthening deficient concrete columns noticeably increased in the past few decades. Plenty of research has been conducted on the behavior of FRP-strengthened circular concrete columns, but far less research has dealt with non-circular columns. In the current study, the focus was to investigate the behavior of square columns with low to medium grade concrete and low steel reinforcement that were strengthened using carbon fiber reinforced polymer (CFRP) wrap. In the experimental portion of this investigation, twelve short square reinforced concrete columns (5" x 5" in cross section and 12" high) were cast and tested under concentric axial loading. The specimens were divided evenly into two series, named C2 and C4. In the first series, C2, six column specimens were cast with 2000-psi concrete, representing low-grade concrete. One column was a "control specimen" designed based on older non-seismic codes. A second column, another "control specimen", was designed based on the current seismic design code, ACI 318-14. The four remaining columns were wrapped with CFRP sheets, but with a different number of CFRP wraps. The same scheme was followed for the specimens of the second series (C4), but they were cast with 4000-psi concrete, representing medium grade concrete. Thus, the main parameters considered in the current study were the concrete compressive strength and the thickness of the CFRP jacket (number of wraps). Those two parameters were utilized to investigate the effectiveness of the CFRP confinement in enhancing the axial load carrying capacity and ductility of the strengthened columns. Test results confirmed that the confinement produced by the CFRP jacket enhanced the axial load-carrying capacity, axial strain capacity, and energy absorption if compared to unwrapped columns. In addition, the results showed that there should be an effective thickness for the CFRP jacket in order to achieve a significant enhancement in the performance of the strengthened columns. Moreover, the test results demonstrated that the effectiveness of the CFRP confinement was more pronounced in the case of the low-grade concrete columns (Series C2).
Book Synopsis Behavior of Channel-shaped Reinforced Concrete Columns Under Combined Biaxial Bending and Compression by : Dureseti Chidambarrao
Download or read book Behavior of Channel-shaped Reinforced Concrete Columns Under Combined Biaxial Bending and Compression written by Dureseti Chidambarrao and published by . This book was released on 1983 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: He inelastic behavior of irregular shaped reinforced concrete columns has been a constant concern for a structural engineer, to design a safe and economic structure in modern buildings and bridge piers. The shape of the elements in a reinforced concrete structure may be used to optimize its structural strength, to make better use of the available space, to improve the aesthetic appearance of the structure, or to facilitate construction. Due to the locations of the columns, the shapes of the buildings and the nature of the applied loads, many columns are subject to combined biaxial bending and axial load. Seven 1/4 scale direct models of the short, tied columns with channel-shaped cross sections were constructed for the present investigation. All the specimens were tested and studied for their complete strength and deformation behavior under combined biaxial bending moments and axial compression, and were used to examine some of the variables involved such as relative eccentricities and loading variations. The end conditions are assumed to be pinned-ended. The experimental load-strain and biaxial moment-curvature curves have been compared with the analytical results of the strength and deformation for biaxially loaded channel-shaped column members, and a satisfactory agreement was obtained from zero up to the ultimate load condition. The above inelastic behavior of channel-shaped reinforced concrete columns has formed the basis of the redistribution of the moments and forces in a statically indeterminate structure, and these characteristics can also be found useful for the limit analysis and design of reinforced concrete structures.
