角柱失效工况下GFRP筋加固RC梁板子结构抗连续倒塌数值模拟研究OA

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 re-moval 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 us-ing 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 perfor-mance.Conclusions Optimizing the arrangement of GFRP bars can effectively enhance the progressive col-lapse resistance of RC beam-slab substructures.The findings provide useful references for structural strengthening design in engineering practice.