矩形墩柱承插式连接设计与承插深度研究

Research on Socket-type Connection Design and Socket Depth of Rectangular Pier Columns

摘要:

预制拼装桥墩采用承插式连接具有受力可靠与施工方便的特点，构造设计的关键是确定承插深度。以实际工程为例详细阐述承插深度的确定过程。基于国外房屋建筑中承插式连接计算方法，并结合桥梁立柱与承台之间竖向受力特点，提出承受压力-弯矩-剪力共同作用的桥墩承插式构造节点受力计算图示，推导了最小承插深度的计算方法；对不同工况下的设计荷载进行了参数对比分析，得到了荷载对最小承插深度的影响规律；为验证计算方法的可靠性开展了模型试验研究，结果表明采用合理承插深度时，承插试件与现浇试件的破坏模式相似，采用的承插构造能够为桥墩提供有效的锚固约束作用。

Abstract:

The precast assembled pier with socket-type connection has the characteristics of reliable force-bearing and convenient construction, and the key of the structural design is to determine the socket depth. Taking an actual project as an example, the determination process of the socket depth is elaborated in detail. Based on the calculation method of socket-type connection in foreign building constructions and combined with the vertical force-bearing characteristics between bridge columns and base slabs, a diagram of force calculation for the socket-type structural nodes of bridge piers subjected to the combined action of pressure, bending moment and shear force is proposed, and the calculation method for the minimum socket depth is derived. The parametric comparison and analyses of design loads under different working conditions are carried out to obtain the influence rules of loads on the minimum socket depth. The model test studies are conducted to verify the reliability of the calculation method. The tests show that when a reasonable socket depth is adopted, the failure modes of socket specimens are similar to those of cast-in-place specimens. The socket structure used in this project can provide effective anchoring and restraining effects for piers.