Monotonic and Cyclic Axial Compressive Properties and Modeling of Basalt FRP-Retrofitted Predamaged Short Columns
Publication: Journal of Composites for Construction
Volume 24, Issue 4
Abstract
This study investigated the monotonic and cyclic axial compressive properties of predamaged concrete retrofitted using externally bonded basalt fiber-reinforced polymer (BFRP) sheets. Plain concrete cylindrical specimens were manufactured and predamaged under three axial compressive loading levels corresponding to peak strength, 10%, and 20% strength degradation after the peak strength of the plain concrete. Specimens for undamaged series were retrofitted with 2-, 4-, and 6-layer BFRP sheets, while the predamaged specimens were retrofitted with 2- and 4-layer BFRP and all the specimens for the cyclic loading series were retrofitted with 4-layer BFRP. Then these BFRP-retrofitted predamaged cylinders were retested under monotonic and cyclic compressive loadings to assess their compressive behavior. For BFRP-retrofitted specimens under monotonic compressive loading, the compressive strength and deformation capacities of the predamaged concrete cylinders were improved remarkably after the retrofitting. However, the initial elastic modulus and compressive strength of the BFRP-retrofitted predamaged cylinders decreased by 38%–55% and 7%–15%, respectively, compared to the retrofitted undamaged cylinders. Under cyclic compressive loading, the energy dissipation capacity of the BFRP-retrofitted concrete decreased gradually with an increase of the predamage level. Based on the test results and existing experimental data collected from the literature, peak strength, ultimate strain, and monotonic stress–strain relationship were newly defined for BFRP-retrofitted predamaged concrete considering the influence of the predamage level. Furthermore, based on the existing cyclic stress–strain model of FRP-retrofitted concrete, an equation for residual strain was introduced, and a modified cyclic compressive stress–strain model was established for BFRP-retrofitted damaged concrete.
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Acknowledgments
The authors express their appreciation for the financial support by the National Natural Science Foundation of China (Grant No. 51878268), the National Key Research and Development Program of China (Grant No. 2017YFC0703306), and the Natural Science Foundation of Hunan Province, China (Grant No. 2015JJ3032).
Notation
The following symbols are used in this paper:
- D
- diameter of the cylinder specimen;
- dc,c
- damage evolution parameters of concrete;
- Eco, Ec, Ec,d
- initial elastic modulus of plain concrete, FRP-retrofitted concrete, and FRP-retrofitted predamaged concrete, respectively;
- ESecu
- secant modulus of the unloading point;
- E2, E2,d
- second slope of the stress–strain curve of FRP-retrofitted undamaged concrete and predamaged concrete, respectively;
- compressive strength of plain concrete, FRP-retrofitted undamaged concrete, and FRP-retrofitted predamaged concrete, respectively;
- ffrp
- tensile strength of FRP laminates;
- fl
- confining pressure provided by FRP;
- fnew, fr, fre, fun
- stress corresponding to the intersection point, reloading point, return point, and unloading point, respectively;
- f0, f0,d
- Y-intercept of the linear second portion of the stress–strain curve of FRP-retrofitted undamaged concrete and predamaged concrete, respectively;
- k, kd
- values of (ɛun − ɛpl) calculated from the test results of FRP-retrofitted undamaged concrete and predamaged concrete, respectively;
- ke
- effective rupture strain coefficient of FRP;
- k1, k2
- fitting coefficients;
- m, p
- fitting coefficients;
- n
- shape parameter of the transition section of the stress–strain curve;
- tfrp
- thickness of one FRP layer;
- ɛco, ɛcc, ɛcc,d
- strain corresponding to , respectively;
- ɛef
- FRP hoop rupture strain;
- ɛnew, ɛr, ɛre, ɛun
- strain corresponding to the intersection point, reloading point, return point, and unloading point, respectively;
- ɛpl, ɛpl,d
- residual strain of FRP-retrofitted undamaged concrete and predamaged concrete, respectively;
- ɛuf
- ultimate strain of FRP laminate using tensile test;
- ζd, αd, βd, γd
- reduction coefficients of initial elastic modulus, compressive strength, ultimate strain, and intercept strength, respectively;
- ηc
- descending path parameter of the stress–strain curve of plain concrete; and
- ξd
- reduction coefficient for (ɛun − ɛpl).
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History
Received: Jun 5, 2019
Accepted: Feb 5, 2020
Published online: Apr 22, 2020
Published in print: Aug 1, 2020
Discussion open until: Sep 22, 2020
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