Study on dynamic effect of bonded prestressed concrete frame ª¤structures in resisting progressive collapse(PDF)

¡¶½¨Öþ¿ÆѧÓ빤³Ìѧ±¨¡·[ISSN:1673-2049/CN:61-1442/TU]

Issue:

2026Äê01ÆÚ

Page:

173-182

Research Field:

½¨Öþ½á¹¹

Publishing date:

Info

Title:

Study on dynamic effect of bonded prestressed concrete frame ª¤structures in resisting progressive collapse

Author(s):

LI Zhi¹; 2;  MAI Caixia²;  CHEN Mingzhe²;  CHU Yixuan²;  QIAN Kai¹; 2

£¨1. Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin University of? Technology, Guilin 541004, Guangxi, China;?

2. School of Civil Engineering, Guilin University of Technology,? Guilin 541004, Guangxi, China£©

Keywords:

progressive collapse;  prestressed concrete;  bonded postª²tensioned strand;  finite element analysis;  dynamic effect

PACS:

TU378.8

DOI:

10.19815/j.jace.2024.12005

Abstract:

A high-precision finite element model of bonded prestressed concrete (BPC) frame structure was established by ANSYS/LS/DYNA finite element analysis software, and the instantaneous column removal dynamic test of BPC frame structure was simulated and analyzed. The accuracy of the highª²precision numerical simulation results was verified by comparing with the collapse test data of BPC frame substructure. On this basis, the influences of prestress degree, prestressed reinforcement ratio, prestressed reinforcement arrangement and weight distribution position on the dynamic effect of BPC structure were discussed. The results show that the increase of prestress degree and prestressed reinforcement ratio can improve the resistance but weaken the deformation capacity of the structure. The vertical stiffness of the linear prestressed tendon arrangement is about 1.17 times that of the parabolic arrangement. When the number of equal parts of the counterweight steel plate increases from 6 to 12, the peak displacement of the structure is reduced by 21.0%, and the vertical stiffness is increased by 26.5%. By comparing the two different boundary conditions, it can be seen that the first peak displacement and equilibrium displacement of the specimen with boundary condition two (actual edge column size) are increased by 17.5% and 34.1% respectively compared to those with boundary condition one (enlarged edge column size). The boundary one is safer than boundary two, but it will underestimate the dynamic effect of the structure. The two boundary conditions have their own advantages and disadvantages, which are suitable for multiple research objectives and experimental environments, and are of great significance for deepening the understanding of the mechanism of structural progressive collapse resistance.

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