Seismic performance of a prefabricated concrete frame node

Shufeng Li; Di Zhao; Can Song; Ke Xu; Zijun Guo; Hangdong Ma; Panpan Wu

doi:10.56748/ejse.26830

Authors

Shufeng Li Xuchang University
Di Zhao Xuchang University
Can Song Xuchang University
Ke Xu Xuchang University
Zijun Guo Xuchang University
Hangdong Ma Xuchang University
Panpan Wu Xuchang University

DOI:

https://doi.org/10.56748/ejse.26830

Keywords:

prefabricated concrete, seismic performance, deformation, energy dissipation, mechanical properties

Abstract

The bolt end plate connection used in steel structures and composite structures has been extended to concrete, forming a through core high-strength bolt connection assembled concrete frame structure. To study the seismic performance and failure mode of the structure, the finite element software is used to simulate low cycle repeated loading tests of the node. Modeling analysis is carried out with axial compression ratio, concrete strength grade, end plate thickness, and other main variable parameters. The influence of different influencing factors on the seismic performance of the node is also explored. The results indicate that the ductility coefficient of the node is generally between 2.43 and 4.16, overall greater than 3.0, demonstrating good ductility and deformation capacity. When the node fails, the equivalent viscous damping coefficient is between 0.3-0.4, demonstrating good energy dissipation capacity. In addition, increasing the thickness of the end plate can significantly improve the stiffness of the node, optimize the efficiency of moment transmission, and suppress adverse deformation. Stress analysis shows that the force transmission of each component of the node is uniform, and key components such as end plates and high-strength bolts are subjected to reasonable forces. The node realizes the design criterion of "strong column, weak beam, stronger node", and the plastic hinge at the beam end is fully developed.

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