[1] Dong Bingqing, Pan Jinlong, Lu Cong,. Flexural behavior of steel reinforced engineeredcementitious composite beams [J]. Journal of Southeast University (English Edition), 2019, 35 (1): 72-82. [doi:10.3969/j.issn.1003-7985.2019.01.011]

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

35

Issue:

2019 1

Page:

72-82

Research Field:

Civil Engineering

Publishing date:

2019-03-30

Info

Title:

Flexural behavior of steel reinforced engineeredcementitious composite beams

Author(s):

Dong Bingqing;  Pan Jinlong;  Lu Cong

Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China

Keywords:

engineered cementitious composite(ECC);  steel reinforced ECC(SRECC);  composite beam;  flexural behavior;  ultimate load-carrying capacity

PACS:

TU398.9

DOI:

10.3969/j.issn.1003-7985.2019.01.011

Abstract:

In order to enhance the durability of steel encased concrete beams, a new type of steel reinforced engineered cementitious composite(SRECC)beam composed of steel shapes, steel bars and ECC is proposed. The theoretical analyses of the SRECC beam including crack propagation and stress-strain distributions along the depth of the composite beam in different loading stages are conducted. A theoretical model and simplified design method are proposed to calculate the load carrying capacity. Based on the proposed theoretical model, the relationship between the moment and corresponding curvature is derived. The theoretical results are verified with the finite element analysis. Finally, an extensive parametric study is performed to study the effect of the matrix type, steel shape ratio, reinforced bar ratio, ECC compressive strength and ECC tensile ductility on the mechanical behavior of SRECC beams. The results show that substitution concrete with ECC can effectively improve the bearing capacity and ductility of composite beams. The steel shape and longitudinal reinforcement can enhance the loading carrying capacity, while the ductility decreases with the increase of steel shape ratio. ECC compressive strength has significant effects on both load carrying capacity and ductility, and changing the ultimate strain of ECC results in a very limited variation in the mechanical behavior of SRECC beams.

References:

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Memo

Memo:

Biographies: Dong Bingqing(1990—), female, Ph.D. candidate; Pan Jinlong(corresponding author), male, doctor, professor, cejlpan@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.51778183), the National Key Research and Development Program of China(No.2016YFC0701907), the Distinguished Young Scholar Foundation of Jiangsu Province(No.BK20160027).
Citation: Dong Bingqing, Pan Jinlong, Lu Cong.Flexural behavior of steel reinforced engineered cementitious composite beams[J].Journal of Southeast University(English Edition), 2019, 35(1):72-82.DOI:10.3969/j.issn.1003-7985.2019.01.011.

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