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Materials and Structures

, Volume 49, Issue 7, pp 2819–2827 | Cite as

Behavior of reinforced concrete-filled GFRP tubes under eccentric compression loading

Original Article

Abstract

This paper presents the results of experimental and theoretical study on the behavior of reinforced concrete-filled glass fiber reinforced polymer (GFRP) tubes (RCFFTs) under eccentric compression loading. A total of six RCFFT specimens were tested, the effects of the following parameters were examined: GFRP tube thickness (4.5 and 6.0 mm), longitudinal reinforcement, inserted I-shaped steel, and eccentricity (20 and 40 mm). The results of this investigation indicate that the ultimate load capacity and ductility of the RCFFT specimens are improved in terms of increasing the thickness of the GFRP tube under eccentric load. However, increasing the eccentricity significantly decreases the load capacity of RCFFT specimens. The internal steel bar could enhance the rigidity and loading capacity of RCFFT specimens. Furthermore, ultimate load capacity and ductility of the specimen are increased significantly by inserting shaped steel into concrete filled GFRP tube, Also, the simplified design equations are proposed to predict the ultimate load capacities of RCFFT specimens.

Keywords

Glass fiber reinforced polymers Tubes Reinforced concrete Eccentric compression Experimental research 

List of symbols

N0

Load capacity of short RCFFTs under compression load

Nu

Load capacity of short RCFFTs under eccentric compression load

φ1

Reduction factor of the loading capacity affected by slenderness ratio

φe

Reduction factor of the loading capacity affected by eccentricity

θ

Confinement index of GFRP tube

ρs

Shaped steel ratio, \(\rho_{\text{s}} = \frac{{f_{\text{y}} A_{\text{s}} }}{{f_{\text{c}} A_{\text{c}} }}\)

ρr

Steel bar ratio, \(\rho_{\text{r}} = \frac{{f_{\text{r}} A_{\text{r}} }}{{f_{\text{c}} A_{\text{c}} }}\)

fc

Axial compressive strength of unconstrained concrete

ff

Hoop tensile strength of GFRP tube

fy, fr

Strength of I shape steel and steel bar, respectively

Ac, Af, As, Ar

Cross-sectional area of concrete, GFRP tube, steel I, longitudinal reinforcement, respectively

e0

Eccentricity

r

Outer radius of the component section

Notes

Acknowledgments

The authors wish to acknowledge the financial support funded by National Ministry of Education of China, and Science and Technology Agency of Liaoning Province. Besides, the authors are also grateful to the support provided by colleagues and School of Resources and Civil Engineering Northeastern University during the experimental program. At last but not least, the authors would like to gratefully acknowledge fellow friends and 211 Test and Research Center of Northeastern University for their assistance on testing the specimens. This study was supported by the Fundamental Research Funds for the Central Universities (N120401010), the Doctoral Fund of National Ministry of Education (20090145012) and the Natural Science Foundation of Liaoning Province (20092019).

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Copyright information

© RILEM 2015

Authors and Affiliations

  1. 1.School of Resource and Civil EngineeringNortheastern UniversityShenyangChina
  2. 2.School of Architecture and Civil EngineeringShenyang University of TechnologyShenyangChina

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