地震研究

承台是桥梁结构中连接桥梁墩柱与桩基的主要受力与传力构件,一般分析时均假定为刚体。为了研究地震作用下承台的受力性能,首先阐述了在静力条件下承台刚体假定所需满足的条件; 通过改变承台的厚度,即承台的自身刚度,建立实体有限元模型与简化刚体假定有限元模型,通过两者之间的比较,分析在静力条件下得出的承台刚体假定条件在地震作用下是否仍具有一定的适用性。结果表明,通过静力方法得出的承台刚体假定的条件在地震作用下具有一定的适用性,但是仍存在一定修正的空间。

As the main force and the force transmission member,the pile caps connect the bridge pier columns and piles foundation in the bridge structure,and is generally assumes to be the rigid body for analyzing. In order to researching the mechanical behavior of pile caps under earthquake,firstly,we introduce the meeting condition when the pile cap assumed as rigid body in static condition. By changing the thickness of the cap,which is also the pile caps under different stiffness,we build solid finite element model and simplified rigid assumption finite element model. Based on the comparison of these two models,we analyze the pile cap in rigid body assumptions condition obtained in static condition whether still has certain applicability under the earthquake. The results show that the assumption condition has certain applicability,however,it is still need to correction.

引言
1 静力作用下承台刚体假定条件
2 计算模型及地震动输入
3 计算结果分析
4 结论

图1 桩基承台示意图<br/>Fig.1 Layout of the pile cap

图1 桩基承台示意图
Fig.1 Layout of the pile cap

图2 地震加速度反应谱<br/>Fig.2 Response spectrum of earthquake acceleration

图2 地震加速度反应谱
Fig.2 Response spectrum of earthquake acceleration

图3 承台实体模型<br/>Fig.3 Solid model of the pile cap

图3 承台实体模型
Fig.3 Solid model of the pile cap

图4 承台刚体假定模型<br/>Fig.4 Rigid body assumption model of the pile cap

图4 承台刚体假定模型
Fig.4 Rigid body assumption model of the pile cap

图5 竖向地震作用下桩顶轴力随承台相对刚度的变化规律<br/>Fig.5 Rules of the axial force on the pile top various with the relative stiffness of the pile cap under the effect of the vertical seismic action

图5 竖向地震作用下桩顶轴力随承台相对刚度的变化规律
Fig.5 Rules of the axial force on the pile top various with the relative stiffness of the pile cap under the effect of the vertical seismic action

图6 纵向地震作用下桩顶轴力随承台相对刚度的变化规律<br/>Fig.6 Rules of the axial force on the pile top various with the relative stiffness of the pile top under the effect of the longitudinal seismic action

图6 纵向地震作用下桩顶轴力随承台相对刚度的变化规律
Fig.6 Rules of the axial force on the pile top various with the relative stiffness of the pile top under the effect of the longitudinal seismic action

图7 纵向地震作用下桩顶剪力随承台相对刚度的变化规律<br/>Fig.7 Rules of the shear on the pile top various with the relative stiffness of the pile top under the effect of the longitudinal seismic action

图7 纵向地震作用下桩顶剪力随承台相对刚度的变化规律
Fig.7 Rules of the shear on the pile top various with the relative stiffness of the pile top under the effect of the longitudinal seismic action

图8 纵向地震作用下桩顶弯矩随承台相对刚度的变化规律<br/>Fig.8 Rules of the moment on the pile top various with the relative stiffness of the pile top under the effect of the longitudinal seismic action

图8 纵向地震作用下桩顶弯矩随承台相对刚度的变化规律
Fig.8 Rules of the moment on the pile top various with the relative stiffness of the pile top under the effect of the longitudinal seismic action

图9 横向地震作用下桩顶轴力随承台相对刚度的变化规律<br/>Fig.9 Rules of the axial force on the pile top various with the relative stiffness of the pile top under the effect of the transverse seismic action

图9 横向地震作用下桩顶轴力随承台相对刚度的变化规律
Fig.9 Rules of the axial force on the pile top various with the relative stiffness of the pile top under the effect of the transverse seismic action

图10 横向地震作用下桩顶剪力随承台相对刚度的变化规律<br/>Fig.10 Rules of the shear on the pile top various with the relative stiffness of the pile top under the effect of the transverse seismic action

图10 横向地震作用下桩顶剪力随承台相对刚度的变化规律
Fig.10 Rules of the shear on the pile top various with the relative stiffness of the pile top under the effect of the transverse seismic action

图11 横向地震作用下桩顶弯矩随承台相对刚度的变化规律<br/>Fig.11 Rules of the moment on the pile top various with the relative stiffness of the pile top under the effect of the transverse seismic action

图11 横向地震作用下桩顶弯矩随承台相对刚度的变化规律
Fig.11 Rules of the moment on the pile top various with the relative stiffness of the pile top under the effect of the transverse seismic action

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备注

引言

1 静力作用下承台刚体假定条件

2 计算模型及地震动输入

3 计算结果分析

4 结论

期刊信息