Simulation Study of Mechanical Performance of Column-to-Column Dry Connection Joint Applicable to Jacking Reverse Construction

Abstract:

To address the inadequacies in the research of vertical permanent component connection joints， a column-to-column dry connection joint suitable for the jacking reverse construction is proposed. A static load-bearing calculation model for the new joint is developed. A finite element model is established to analyze the effects of parameters such as axial compression ratio， upper-to-lower column height ratio， and bolt arrangement in the joint on its seismic performance. The results indicate that the new joint can reliably connect the upper and lower segments of the column. The specimens exhibit ductile bending failure under a reasonable shear-span ratio. With the axial compression ratio increasing， the ultimate load of the specimen decreases. When the upper-to-lower column height ratio is 1/3， the bearing capacity of the specimens with the new column-to-column connection joint is equivalent to that cast-in-place specimen. Under high axial compression ratios， its displacement ductility is close to that of the cast-in-place specimen， and the energy dissipation capacity is only about 6% lower when the height ratio of the upper-to-lower column height ratio is 1/3. The proposed restoring force model is in good agreement with the simulation results.