Dynamic Bond Stress-Slip Relationship between Basalt FRP Sheet and Concrete under Initial Static Loading
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Abstract
Reinforced concrete structures strengthened by fiber-reinforced polymer (FRP) always suffer dynamic loadings. Furthermore, the dynamic loadings are always added at the base of static loadings. The success of this strengthening method relies on the effectiveness of the bond of the FRP sheet to the concrete. Although numerous experimental studies have investigated this bond, experimental data concerning dynamic tests on basalt FRP (BFRP) sheets applied on concrete specimens under different initial static loadings are still lacking. This paper presents an experimental investigation on the dynamic bond behavior between the BFRP sheet and concrete under different initial static loadings (0, 30, 50, 80, and 100%) and displacement rate of . Double-lap shear specimens were used for the tests. The results of the dynamic tests are reported and discussed to evaluate and compare the influence of initial static loading on the dynamic bond behavior between BFRP sheets and concrete. A nonlinear bond stress-slip relationship of the BFRP-concrete interface under different initial static loadings is determined based on an analysis of displacement data, which comprise four empirical parameters, namely, dynamic maximum bond stress under different initial static loadings, corresponding slip , curve characteristic constant , and local slip . The test results show that (1) the dynamic bond capacity of the BFRP-concrete interface decreases with increasing initial static loading; (2) the failure mode of all specimens is debonding in the concrete layer; (3) the dynamic effective bond length of the BFRP-concrete interface increases with increasing initial static loading; and (4) the dynamic maximum bond stress decreases with increasing initial static loading. The calculation models of dynamic bond capacity and dynamic effective bond length considering the influence of initial static loading are also presented.
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Acknowledgments
The open foundation of State Key Laboratory for Disaster Reduction in Civil Engineering of Tongji University (Grant No. SLDRCE 13-MB-05) is gratefully acknowledged. The Support of the Fundamental Research Funds for Central Universities (Grant No. 2014B07114) and the financial support of the National Natural Science Foundation of China (Grant No. 51279051 and 51008113) and Special Fund for Water Conservation Research in the Public Interest (Grant No. 201101014) are also gratefully acknowledged.
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Journal of Composites for Construction
Volume 19 • Issue 6 • December 2015
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© 2015 American Society of Civil Engineers.
History
Received: Sep 15, 2014
Accepted: Jan 12, 2015
Published online: Mar 2, 2015
Discussion open until: Aug 2, 2015
Published in print: Dec 1, 2015
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