哑铃型群桩承台的力学性能研究  

Study on Mechanical Properties of Dumbbell-shaped Group-pile Base Slab

作　　者：袁勇根 Yuan Yonggen

机构地区：[1]上海市政工程设计研究总院(集团)有限公司

出　　处：《城市道桥与防洪》2019年第12期71-74,M0009,共5页Urban Roads Bridges & Flood Control

摘　　要：以宁波市三官堂大桥主桥哑铃型低桩承台基础为工程背景,采用有限元模型研究了大型哑铃型承台的静动力特性,并与平面m法的计算结果对比,同时采用反应谱方法重点讨论了横系梁在地震作用下的传力规律。结果表明:平面m法计算桩顶轴力比较精确,且与有限元计算结果接近,但是用来计算桩顶弯矩和剪力时则误差较大;设置系梁后,系梁刚度会对哑铃型低桩承台基础的地震反应产生较大影响,随着系梁刚度的逐渐加大,系梁从小刚度时以传递轴力为主到大刚度时以传递弯矩为主变化。Taking the foundation of dumbbell-shaped low-pile base slab of Sanguantang Bridge in Ningbo as the engineering background, this paper studies the static and dynamic characteristics of large dumbbell-shaped base slab by the finite element model, and compares with the calculation results of the plane m method, and meanwhile, mainly discusses the law of force transfer of cross tie beam under the seismic action by the response spectrum method. The results show that the plane m method is more accurate in calculating the axial force on the top of pile, but the bending moment and shear error of pile top is large.The stiffness of tie beam after set up will have a greater impact on the seismic response of dumbbell-shaped low-pile base slab foundation. With the gradual increment of tie beam stiffness, the tie beam mainly transmits the axial force when it is small stiffness and mainly transmits the bending moment when it is large stiffness.

关 键 词：哑铃型承台 横系梁 地震反应 

分 类 号：U443.1[建筑科学—桥梁与隧道工程]