承插式预制拼装桥墩的最小合理承插深度

Minimum Reasonable Socket Depth of Precast Pier-footing with Socket Connection

摘要:

预制桥墩和承台采用承插式连接即直接将预制桥墩插入承台预留槽中，并用灌浆料填缝形成整体的桥墩承台连接构造，这种连接的特点在于施工精度要求相对低，施工工序简单，现场作业量少.其力学性能取决于桥墩的插入深度和接缝灌浆料的粘结性能.以实际工程为研究背景，对采用不同承插深度的试件进行拟静力试验以及基于OpenSEES的数值模拟，通过分析和比较，研究承插深度对整个桥墩力学性能的影响，并结合公式推导提出最小合理承插深度建议值，为实际工程提供设计指导.

Abstract:

Socket connection is an approach to connect precast members by inserting the pier directly into a pre-opened socket of the footing that is precast or cast in site construction, and sealing with high strength non-shrink grout. The significant advantages of this connection are low alignment accuracy, simple construction and less on-site workload. Its mechanical performance highly depends on the socket depth of the pier and the bond property of grout. Therefore, quasi-static test of specimens designed from a real bridge with different socket depth was conducted together with the numerical simulation by OpenSEES, to study the influence of socket depth on the seismic performance of the bridge pier. The minimum reasonable socket depth was proposed based on the results experimentally and numerically, providing a reliable guidance for such pier design.