Structural Engineering and Mechanics

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Experiments and theory for progressive collapse resistance of ECC-concrete composite beam-column substructures

  • Weihong, Qin (The Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University) ;
  • Wang, Song (The Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University) ;
  • Peng, Feng (College of Civil Engineering, Tsinghua University) ;
  • Zhuo, Xi (The Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University) ;
  • Tongqing, Zhang (The Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University)
  • Received : 2022.05.04
  • Accepted : 2022.12.06
  • Published : 2023.01.10
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Abstract

To explore the effect of Engineered Cementitious Composite (ECC) on improving the progressive collapse resistance of reinforced concrete frames under a middle column removal scenario, six beam-column substructures were tested by quasistatic vertical loading. Among the six specimens, four were ECC-concrete composite specimens consisting of different depth of ECC at the bottom or top of the beam and concrete in the rest of the beam, while the other two are ordinary reinforced concrete specimens with different concrete strength grades for comparison. The experimental results demonstrated that ECC-concrete composite specimens can improve the bearing capacity of a beam-column substructure at the stages of compressive arch action (CAA) and catenary action in comparison with ordinary concrete specimen. Under the same depth of ECC, the progressive collapse resistance of a specimen with ECC at the beam bottom was superior to that at the beam top. With the increase of the proportion of ECC arranged at the beam bottom, the bearing capacity of a composite substructure was increased, but the increase rate slows down with the proportion. Meanwhile, the nonlinear numerical analysis software MSC Marc was used to simulate the whole loading process of the six specimens. Theoretical formulas to calculate the capacities of ECC-concrete composite specimens at the stages of flexural action, CAA and catenary action are proposed. Based on the research results, this study suggests that ECC should be laid out at the beam bottom and the layout depth should be within 25% of the total beam depth.

Keywords

Acknowledgement

The research described in this paper was financially supported by the National Natural Science Foundation of China (Nos. 51378108 and 51678137) and the Fundamental Research Funds for the Central Universities (Nos. 2242022k30031, 2242022k30033).

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