Study on seismic behavior of embedded concrete filled steel tube(CFST)pier-cap beam socket joints
The prefabricated bridge adopts the construction method of factory prefabrication and on-site assembly,which has the advantages of high construction quality,short construction period and less environmental disturbance.To meet the construction requirements of the prefabricated bridge substructure,this paper proposes a new type of embedded concrete-filled steel tube(CFST)pier column-cap beam socket connection joint combined with Ultra High-Performance Concrete(UHPC).A quasi-static test with a scale of 1∶3 was carried out to reveal the damage development and failure modes of the joints,to study the influence of the socket depth on the seismic performance of the joints,and to establish a refined numerical analysis model of the joints based on ABAQUS.The research results show that the socket depth of 1.2 times the CFST diameter can ensure that the damage occurs outside the joint area,and the cap beam maintains an elastic state.The good seismic performance of the new joint is verified by analyzing the seismic performance indicators such as hysteretic curve,socket capacity and energy dissipation capacity.Based on the test results,it is verified that the joint numerical analysis model can predict the overall seismic response and capacity of the joints with reasonable accuracy.The research work in this paper can provide a reference for the engineering application of prefabricated bridge substructure in medium and high seismic intensity areas.
万方数据
维普
