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Flexural Behavior of FRP-reinforced ECC Beam(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2020年06期
Page:
46-54
Research Field:
Publishing date:

Info

Title:
Flexural Behavior of FRP-reinforced ECC Beam
Author(s):
ZHOU Jia-jia1;  YAO Shao-ke2;  JING Chuan3;  ZHAO Jun1;  ZHANG Li-juan1
1. School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China; 2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China; 3. State Grid Henan Economic Research Institute, Zhengzhou 450052, Henan, China
Keywords:
FRP-reinforced ECC beam;  flexural behavior;  theoretical analysis;  numerical calculation
PACS:
TU311
DOI:
-
Abstract:
In order to investigate the flexural behavior of fiber reinforced polymer(FRP)-reinforced engineered cementitious composites beam(FRP-reinforced ECC beam), the theoretical analysis and numerical calculation of the whole normal-section bending process were carried out. Firstly, based on the plane section assumption and the constitutive model of materials, the stress distribution of FRP-reinforced ECC beam during the whole bending process was obtained, and the formula for calculating normal-section flexural capacity was derived at each loading stage. The whole bending process of FRP-reinforced ECC beam was analyzed by numerical calculation with MATLAB. The correctness of the model was verified by comparing the calculated load-deflection curves with the existing test results. Then, based on the proposed theoretical model, the influence of ECC compressive strength and FRP reinforcement ratio on the flexural performance of the beam was analyzed. Finally, based on the proposed ductility coefficient calculation formula of FRP-reinforced ECC beam, the influence of FRP reinforcement ratio and ECC compressive strength on the ductility of beam was analyzed, and it was pointed out that the ductility change of FRP-reinforced ECC beam was closely related to the failure mode of beams. The results show that the change of ECC compressive strength and FPR reinforcement ratio can change the failure mode of the beam, but the influence of FRP reinforcement ratio is greater. ECC compressive strength has great influence on the initial crack load and ultimate bearing capacity of the beam. The reinforcement ratio can significantly improve the short-term stiffness and ultimate bearing capacity of the beam, but has little effect on the initial crack load of the beam.

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