适用于顶升逆作法的柱‒柱干式连接节点力学性能仿真

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

摘要:

提出了一种适用于顶升逆作法的柱?柱干式连接节点，建立了受弯承载力计算模型。建立有限元模型分析轴压比、上下柱高比、节点螺栓排布等参数对该节点抗震性能的影响。结果表明，新型节点可实现上下两段柱的可靠连接，合理剪跨比下试件整体发生受弯延性破坏；随轴压比升高，试件极限荷载降低；上下柱高比为1/3时，采用新型柱?柱连接节点的试件承载力与现浇试件相同；在高轴压比下，其位移延性与现浇试件差别较小，上下柱高比为1/3时试件耗能能力仅比现浇试件低约 6%。建立的恢复力模型与模拟结果较为吻合。

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.