Strain-Gradient-Dependent Stress-Strain Curve for Normal-Strength Concrete

To date, various predictive models for high strength concrete (HSC) have been proposed that are capable of generating complete stress-strain curves. These models were validated for HSC prepared with and without silica fume. In this paper, an investigation on these predictive models has been presented by applying them on two different series of HSC. The first series of HSC was prepared by utilizing 100% cement content, while second series was prepared by utilizing 90% cement and 10% Metakaolin. The compressive strength of the concrete was ranged from 71-87 MPa. For each series of HSC, total four cylinders of the size 100×200mm were cast to obtain the stress-strain curves at 28 days.It has been found that the pattern of the stress-strain curve of each cylinder among four cylinders of each series was different from other, in spite of preparing from the similar batch. When predictive models were applied to these cylinders using their test data then it was found that all models more or less deficient to accurately predict the stress-strain behavior.

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Influence of Steel Fibers on Design Stress-Strain Curve for High-Strength Concrete

Journal of Engineering Mechanics ◽

10.1061/(asce)0733-9399(1996)122:8(695) ◽

1996 ◽

Vol 122 (8) ◽

pp. 695-704 ◽

Cited By ~ 23

Author(s):

L. Taerwe ◽

A. Van Gysel

Keyword(s):

High Strength Concrete ◽

Strain Curve ◽

High Strength ◽

Steel Fibers ◽

Stress Strain Curve ◽

Stress Strain ◽

Strength Concrete ◽

Design Stress

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Design-oriented axial stress–strain model for partially fiber-reinforced-polymer-confined normal-strength concrete

Advances in Structural Engineering ◽

10.1177/1369433220933461 ◽

2020 ◽

Vol 23 (16) ◽

pp. 3481-3495

Author(s):

Junlong Yang ◽

Jizhong Wang ◽

Ziru Wang

Keyword(s):

Axial Stress ◽

Concrete Columns ◽

Fiber Reinforced Polymer ◽

Confined Concrete ◽

Normal Strength Concrete ◽

Stress Strain ◽

New Model ◽

Strength Concrete ◽

Reinforced Polymer ◽

Normal Strength

Due to the influence of “arching action” in fiber-reinforced polymer (FRP) partially confined concrete columns as a result of the unconfined regions, the confinement of the concrete columns wrapped with discrete FRP strips is less efficient when compared with full wrapping schemes. This study comprehensively investigates the difference of the the confinement mechanism between fully and partially FRP confined circular normal-strength concrete and thus presents a new design-oriented model to predict the stress–strain relationships of partially FRP confined normal-strength concrete. The formulas used to determine the strength and corresponding strain of several key points on the stress–strain curves are also proposed by the regression analysis according to a reliable test database from the relevant literature. Besides, another selected database including 100 FRP partially wrapped circular concrete columns is also collected for model verification. The results show that better performance can be achieved by the new model compared with the selected models in predicting the ultimate conditions of partially FRP confined concrete. Finally, some specimens are chosen to assess the performance of the new model in predicting the complete axial stress–strain curves. The comparisons reveal that satisfactory accuracy and good agreement can be achieved between the theoretical predictions and experimental observations.

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