Investigation on shear behavior of precast assembled column connected with grouting sleeve
Prefabricated bridge technology adopts new construction technology and connection form,which is the development direction of future bridge engineering.Grouting sleeve connection is a common connection method for prefabricated bridge pier joints.In order to ascertain its shear behavior under earthquake action,this paper adopts a scale ratio of 1∶4 and designed grouting sleeve connection pier joints with shear-span ratios of 2.50 and 1.75.By carrying out low-cycle cyclic load tests,the mechanism of seismic failure of bridge piers was revealed,and the influence of different shear-span ratios on their seismic performance was explored.A finite element model was also established to predict the seismic performance of grouted sleeve connection nodes.The research shows that the failure mode of the specimens is that after the joint grouting material was damaged under compression,the longitudinal reinforcement of the pier column fractured,and increasing the shear-span ratio can increase the damage of the concrete at the bottom of the pier column.The comparisons of energy dissipation capacity,stiffness degradation and ductility performance show that the sleeve connection specimen has good seismic performance.The established finite element model can accurately predict the damage development and hysteresis curve of sleeve connection specimens.The research in this paper can provide technical reference for the application of low shear-span ratio grouting sleeves connecting prefabricated piers.
万方数据
维普
