LI Z, LIU W X, SHI Y H, et al.Numerical study on progressive collapse resistance of GFRP-reinforced RC beam-slab substructures under corner column removal[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(3):163-170.

doi:10.16186/j.cnki.1673-9787.2024020015

Received:2024/02/22

Revised:2024/04/30

Published:2026/04/28

Numerical study on progressive collapse resistance of GFRP-reinforced RC beam-slab substructures under corner column removal

Li Zhi1,2, Liu Wangxiang1,2, Shi Yuhuan2, Lin Ruiwen2, Deng Lian1, Hu Haining3

1.Guangxi Key Laboratory of Green Building Materials and Construction Industrialization， Guilin  541004， Guangxi， China；2.College of Civil Engineering， Guilin University of Technology， Guilin  541004， Guangxi， China；3.Guangxi College of Water Resources and Electric Power， Nanning  530023， Guangxi， China

Abstract: Objectives To investigate the progressive collapse resistance of reinforced concrete （RC） beam-slab substructures strengthened with glass fiber reinforced polymer （GFRP） bars under a corner column removal scenario， and to evaluate the effects of reinforcement ratio， bar diameter， and arrangement of GFRP bars.  Methods A refined finite element （FE） model was developed based on pushdown tests of GFRP-reinforced RC beam-slab substructures. The load-resisting mechanisms and failure modes were analyzed using the proposed model.  Results The results indicate that increasing the GFRP reinforcement ratio by 0.36% leads to a 9.68% increase in peak load and a 49.17% increase in residual load-carrying capacity， demonstrating a more pronounced improvement in residual capacity. When the reinforcement ratio remains constant， reducing the bar diameter from 10 mm to 4 mm increases the peak load by 2.10%. Although the increase in load capacity is limited， smaller-diameter bars effectively reduce crack width. When GFRP bars are arranged perpendicular to the failure line， a comparable strengthening effect can be achieved with only 60% of the material used in the parallel arrangement. With the same amount of GFRP bars， the peak load increases by 6.03%， indicating that the perpendicular arrangement provides better strengthening performance.  Conclusions Optimizing the arrangement of GFRP bars can effectively enhance the progressive collapse resistance of RC beam-slab substructures. The findings provide useful references for structural strengthening design in engineering practice.

Key words:progressive collapse;corner column removal;RC beam-slab substructure;GFRP reinforcement;finite element method