Experimental study and finite element analysis on flexural behavior of new assembled composite beams
To meet the development needs of prefabricated buildings and facilitate the rapid assembly of steel-concrete composite beams,a prefabricated composite beam based on high-strength bolted connections is proposed.The longitudinal flexural performance and connector reliability of the assembled composite beam were investigated through orthotropic two-point loading bending tests.Damage modes,load-deflection curves,mid-span section strain distribution curves,and load-slip curves of the assembled beam were obtained.A three-dimensional solid finite element model was established based on the flexural test,and the effects of precast concrete slab strength,cement-based grouting material(CGM)grout strength,high-strength bolt preload and shear connector degree on the flexural performance of the composite beam were analyzed.Test and finite element analysis results show that the combined beams mainly exhibit bending damage of the crushed concrete slab,demonstrating better performance under high-strength bolt connections.Increased concrete slab strength improves ultimate bearing capacity,although the overall increase is not substantial.CGM grout strength and high-strength bolt preload have minimal influence on ultimate bearing capacity but improve overall stiffness in the elastic phase.Beyond a shear connection degree of 0.7,further increasing the degree has limited effect on bending performance.These findings provide valuable insights for the application of this new type of assembled composite beam.
steel-concrete composite beambeam testfinite element analysisprefabricated structurehigh strength bolted connection
万方数据
维普
