桩柱式桥墩-桩基连接的抗震性能分析

Seismic Performance of Column-to-drilled-shaft Connections

摘要:

为了深入揭示桩柱式桥墩-桩基连接区域的传力机理和破坏模式，对现有的试验结果进行了精细化的有限元模拟，分析连接区域的传力机理和破坏过程，并利用校验后的有限元模型进行参数分析，探讨剪跨比、承插深度、桩墩直径比、桩基配箍率对连接区域抗震性能的影响。结果表明：提出的有限元模拟方法能够较为准确地模拟桩柱式墩-桩基连接区域的力学行为；连接区域的破坏模式表现为桥墩承插段对桩基杯口顶部的水平推力导致的桩基箍筋屈服；增大剪跨比、桩墩直径比、承插深度、桩基配箍率均能提高连接区域的承载力。

Abstract:

In order to deeply reveal the force transmission and damage mechanism of column-to-drilled-shaft connections， detailed finite element simulation of exist experimental test was conducted， and force transmission and damage mechanism were analyzed. After verification of finite element models， the effect of shear-span ratio， embedment depth， connection diameter-to-column diameter ratio and pile transverse reinforcement ratio on seismic performance of column-to-drilled-shaft connections was studied by numerical simulation. Results indicate that proposed finite element models can adequately replicate the mechanical behavior of column-to-drilled-shaft connection. The damage of connection region is presented as pile stirrup yielding induced by horizontal compression from embedment pier segment. Additionally， the connection strength increases with the increasing of shear-span ratio， connection diameter-to-column diameter ratio， embedment depth and pile transverse reinforcement ratio.