Experimental Evaluation of the Behavior of Spirally-reinforced High-strength Concrete Columns PDF Download

Author: Annette M. Pieroni
Publisher:
ISBN:
Category : Columns, Concrete
Languages : en
Pages : 169

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Author: Wen-Hsiung Lin
Publisher:
ISBN:
Category : Axial loads
Languages : en
Pages : 177

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Author: David L. Montgomery
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description
An experimental investigation was conducted to study the behavior of spirally reinforced high strength concrete (HSC) columns subjected to axial compression loading. The main objective of the experiment was to investigate the effects of the volumetric ratio of spiral steel, the spiral spacing, the specimen size and the concrete strength on the strength and ductility performance of confined concrete. Behavior of the cover concrete, spiral reinforcement steel, and longitudinal reinforcing bars were also investigated to gain insight into the overall behavior of HSC columns. A total of 32 spirally reinforced HSC columns were tested, including ten 254 mm diameter columns with concrete strength f'c of 69.7 Mpa, nine 203 mm diameter columns with concrete strength f'c of 69.7 MPa, and thirteen 203 mm diameter columns with concrete strength f 'c of 89.8 MPa. Overall height of each specimen was four times the diameter. All of the specimens were reinforced longitudinally with five deformed reinforcement bars and laterally by various amounts of spiral reinforcement. An increase in the volumetric ratio of spiral steel resulted in increases in the strength and ductility of confined HSC, with the improvements in ductility being more pronounced. Reductions in spiral spacing resulted in improved strength and ductility of confined HSC when the volumetric ratio of spiral steel was sufficiently large. Increases in concrete strength were found to result in decreases in the peak strength enhancement, axial strain at peak strength, spiral stress at peak strength, and deformability of the specimens. Larger diameter columns achieved better participation of the cover concrete shell and had larger strengths at low axial strains. Cover concrete began spalling at lower concrete strengths and at earlier axial strains than expected in the columns with f'c of 89.8 MPa.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Salvador Martinez Morales
Publisher:
ISBN:
Category : Columns, Concrete
Languages : en
Pages : 602

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Author: Mu'taz Almomani
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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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.

Author: Ioan Tuns
Publisher: Springer Nature
ISBN: 3031607651
Category :
Languages : en
Pages : 500

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Book Description

Author: Guangliang Feng
Publisher: Springer Nature
ISBN: 9819925320
Category : Technology & Engineering
Languages : en
Pages : 627

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Book Description
This open access book is a compilation of selected papers from the 9th International Conference on Civil Engineering (ICCE2022). The work focuses on novel research findings on seismic technology of civil engineering structures, High-tech construction materials, digitalization of civil engineering, urban underground space development. The contents make valuable contributions to academic researchers and engineers.

Author: Alper Ilki
Publisher: Springer Nature
ISBN: 3030881660
Category : Technology & Engineering
Languages : en
Pages : 2516

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Book Description
This volume highlights the latest advances, innovations, and applications in the field of FRP composites and structures, as presented by leading international researchers and engineers at the 10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), held in Istanbul, Turkey on December 8-10, 2021. It covers a diverse range of topics such as All FRP structures; Bond and interfacial stresses; Concrete-filled FRP tubular members; Concrete structures reinforced or pre-stressed with FRP; Confinement; Design issues/guidelines; Durability and long-term performance; Fire, impact and blast loading; FRP as internal reinforcement; Hybrid structures of FRP and other materials; Materials and products; Seismic retrofit of structures; Strengthening of concrete, steel, masonry and timber structures; and Testing. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster multidisciplinary collaboration among different specialists.

Author: Salim R. Razvi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description
A comprehensive research project was conducted to investigate the behaviour and design of earthquake resistant normal-strength and high-strength concrete columns. The project included three essential components; testing of full size columns, development of an analytical model, and development of a design procedure. The experimental program consisted of material research and structural testing. The first phase was designed to study mechanical properties of high-strength concrete, which involved testing of a large number of concrete cylinders. The second phase was designed to investigate performance of confined normal and high-strength concrete columns under concentric compression. The experimental program included tests of 46 full size square and circular columns, with concrete strength ranging between 60 MPa and 124 MPa. The parameters considered included; cross-sectional shape (circular and square), volumetric ratio and spacing of transverse reinforcement, distribution of longitudinal reinforcement and resulting tie arrangement, yield strength of transverse reinforcement, concrete compressive strength, influence of longitudinal reinforcement in circular columns, and type of circular reinforcement (continuous spiral and circular hoops). The analytical component of the research program involved development of a mathematical model to represent stress-strain relationship of confined concrete. This was done in two steps. The first step included formulation of the relationship for normal strength concrete, for which extensive test data was available. The second step involved modification of the model for high-strength concrete. An extensive literature survey was first conducted, followed by evaluation of previous test data. This information was used, along with the results of the experimental phase of this investigation to develop a generalized cofinement model for normal-strength and high-strength concrete columns. The analytical and experimental research was used in developing a design procedure for confinement of earthquake resistant concrete columns. The procedure includes all the relevant parameters of confinement that have been observed to be important in column tests, and relates the design variables to deformation capacities. A displacement based design methodology was developed, where the lateral drift demand is a design parameter. This approach leads to different confinement steel requirements for columns with different deformability demands, an approach currently lacking in practice. Furthermore, the reinforcement arrangement is recognized as a design parameter, allowing lower volumetric ratio of confinement reinforcement for efficient arrangements. This may result in significant savings in steel, eliminating the common problem of steel congestion in earthquake resistant columns. (Abstract shortened by UMI.).