Novel Size-Effect Law for Shear Strength of CFRP-Strengthened Lightweight Concrete Deep Beams without Stirrups
Publication: Journal of Composites for Construction
Volume 26, Issue 1
Abstract
Several size-effect laws (SELs) have been proposed and verified for concrete-like quasi-brittle materials. However, there is no SEL that can quantitatively describe the influence of related factors on size effect in carbon fiber–reinforced polymer (CFRP)-strengthened lightweight aggregate concrete (LWC) components without stirrups, for example, the shear failure of beams. The main purpose of the present study is to develop a novel SEL for the evaluation of shear strength of CFRP-strengthened LWC and normal-weight concrete (NWC) beams. A 3D mesoscale simulation method is employed to explore the structural behavior of both LWC and NWC beams wrapped with CFRP sheets, in which both the concrete heterogeneities and the steel/concrete interactions are considered. Based on the modeling approach, the influences of shear span ratio and CFRP ratio on the shear failure behavior and the size effect on shear strength are studied. Also, the shear contribution by CFRP on the LWC beams having different shear span ratios under different structural sizes (i.e., beam-depth) is examined. Finally, a novel size effect law that can quantitatively describe the influence of shear span ratio and CFRP ratio on shear strength of CFRP-strengthened LWC beam is developed, and it is verified with the available test data and simulation results.
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Acknowledgments
This work was supported by the National Key Basic Research and Development Program of China (No. 2018YFC1504302) and the National Natural Science Foundation of China (Nos. 51822801 and 51708007). The support is gratefully appreciated.
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Journal of Composites for Construction
Volume 26 • Issue 1 • February 2022
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© 2021 American Society of Civil Engineers.
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Received: Feb 9, 2021
Accepted: Sep 5, 2021
Published online: Nov 30, 2021
Published in print: Feb 1, 2022
Discussion open until: Apr 30, 2022
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Cited by
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