Load-deformation Behaviour of Eccentrically Loaded SSTT-confined High Strength Concrete Columns

2015 ◽  
Vol 74 (4) ◽  
Author(s):  
Ma Chau Khun ◽  
Abdullah Zawawi Awang ◽  
Wahid Omar
Keyword(s):  
High Strength Concrete ◽  
Deformation Behaviour ◽  
High Strength ◽  
Concrete Columns ◽  
Fiber Reinforced Polymer ◽  
Capacity Enhancement ◽  
Strength Concrete ◽  
Reinforced Polymer ◽  
Concentric Loading ◽  
Future Work

The application of steel-straps confinement or better known as steel-strapping tensioning technique (SSTT) has been proven to be effective in increasing the strength and ductility of High-Strength Concrete (HSC) column comparable to Fiber-Reinforced Polymer (FRP).  However, most of the research of confined HSC column has mainly concentrated on concentric loading. In actual practical condition, most of the columns are subjected to eccentric loading. The scarcity of the experimental data for eccentric loaded confined HSC column has prevented the potential use of this type of structure element. In this paper, five HSC columns were tested. The specimens were SSTT-confined and tested with 25mm and 50 mm eccentric loading. The results show that SSTT confinement can increase the strength and deformability of high-strength concrete column, although the strain gradient reduces the confining efficiency. Therefore, smaller capacity enhancement factor should be used in eccentrically loaded SSTT-confined HSC columns compared to concentrically loaded columns. Furthermore, the non-linear theoretical model established in this study can be used for templates for future work on SSTT-confined HSC columns.

Experimental Studies on High Strength Concrete Beams Reinforced with Steel and GFRP Rebars

2012 ◽  
Vol 238 ◽  
pp. 669-673 ◽  
Author(s):  
Ying Hao Liu ◽  
Yong Yuan
Keyword(s):  
High Strength Concrete ◽  
Experimental Studies ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Structural Behavior ◽  
Strength Concrete ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Steel Rebars ◽  
Gfrp Rebars

The paper analyzes the structural behavior of high strength concrete (HSC) beams reinforced with hybrid glass fiber reinforced polymer (GFRP) and steel reinforcements. The analysis refers to HSC beams reinforced with GFRP rebars and steel rebars placed in different layers. Results of the experimental and theoretical investigation are represented and discussed. Significant features of the structural behavior regarding flexural strength, deflection, are pointed out.

A Simple Design-Oriented Model for FRP-Confined High-Strength Concrete

2013 ◽  
Vol 743 ◽  
pp. 45-49
Author(s):  
Jian Chin Lim ◽  
Togay Ozbakkloglu
Keyword(s):  
High Strength Concrete ◽  
Concrete Strength ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Simple Design ◽  
Compressive Behavior ◽  
Strength Concrete ◽  
Strength Enhancement ◽  
Reinforced Polymer ◽  
Test Database

This paper presents a study on the axial compressive behavior of fiber reinforced polymer (FRP)-confined high-strength concrete (HSC). A large experimental test database assembled from the published literature was used to investigate and quantify factors influencing the compressive behavior of FRP-confined HSC. The database consisted of 976 test data having unconfined concrete strength ranging from 6.2 to 169.7MPa. Based on the analysis results of the database, it was found that the threshold confinement stiffness increases significantly with an increase in concrete strength, which in turn adversely affects the strength enhancement of confined concrete. It was also observed that the hoop rupture strain of FRP shell decreases with an increase in concrete strength. Existing confinement models that are applicable to FRP-confined HSC were assessed using the database. Finally, a new simple design-oriented model for FRP-confined HSC developed on the basis of the database is presented.

Experimental Investigation of Ductility of Reinforced High Strength Concrete T-Section Beams Retrofitted with CFRP

2012 ◽  
Vol 446-449 ◽  
pp. 601-610 ◽  
Author(s):  
Su Yan Wang ◽  
Ze Yuan Wang
Keyword(s):  
High Strength Concrete ◽  
Quantitative Relationship ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Interface Shear ◽  
Interface Shear Stress ◽  
Displacement Ductility ◽  
Strength Concrete ◽  
Reinforced Polymer ◽  
Cfrp Sheet

The objective of this paper is to investigate the ductility of reinforced high strength concrete (HSC) T-section beams retrofitted with carbon fiber reinforced polymer (CFRP) sheet, and to analyse how such retrofitting affects deflection, curvature and energy ductility of strengthened T-section beams. Two series, a total of nine T-section beams-two control specimen and seven strengthened beams were constructed and tested under flexural load. The effect of longitudinal CFRP amount, type of cross-section of specimen, and the location and configuration of U-anchorage on ductility was studied. The influence of distribution of strain and interface shear stress of CFRP sheets on ductility was analysed as well. This paper also proposes the quantitative relationship between CFRP amount and displacement ductility indiced by means of theoretic calculation method. And relevant suggestions for its design and application are also presented.

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