Moment-curvature relationship of FRP-concrete-steel double-skin tubular members

Abstract

Tests were conducted on 3 specimens to study the flexural behavior of fiber reinforced polymer (FRP)-concrete-steel double-skin tubular members (DSTMs). The strip method was used to calculate the section moment-curvature curves of the 3 specimens and 12 models. A theoretical formula is presented for the flexural strength of DSTMs. The test results show that the tension zone of the specimen FRP tubes was in hoop compression while the compression zone was in hoop tension. The load-carrying capacity did not decrease even when the mid-span deflection reached about 1/24 of the span length. The tests, simulation and theoretical analysis resulted in a simplified formula for the flexural strength of DSTMs and a tri-linear moment-curvature model was expressed as a function of the section bending stiffness for DSTMs.

Keywords

fiber reinforced polymer (FRP) / concrete / steel / double-skin tubular members (DSTMs) / moment-curvature curve / flexural strength

References

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Acknowledgements

This work was supported by the National Science Foundation of China (Grant No. 50329802). The authors would like to express their sincere gratitude for the financial assistance.

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg