大跨度悬索桥重力式锚碇基础结构优化分析  

Analysis on the Optimization of Gravity Anchorage Foundation Structure of Long-Span Suspension Bridge

作　　者：王超 李丹 张川龙 Wang Chao;Li Dan;Zhang Chuanlong(Nanjing Public Engineering Construction Center,Nanjing Jiangsu 210019,China;College of Civil and Transportation Engineering,Hohai University,Nanjing Jiangsu 210098,China)

机构地区：[1]南京市公共工程建设中心,江苏南京210019 [2]河海大学土木与交通学院,江苏南京210098

出　　处：《城市建筑》2021年第18期172-176,共5页Urbanism and Architecture

摘　　要：本文基于Plxis 3D有限元平台,对南京市仙新路大桥锚碇沉井基础进行结构优化分析。在现有规范的基础上,本文考虑结构与土体的相互作用,对该锚碇基础进行抗滑计算、抗倾覆计算、地基承载力验算;然后通过等比例加大主缆力计算锚碇的安全系数。计算结果表明,当锚碇沉井基础考虑土体抗力时,锚碇基础结构存在可进一步优化的空间。与悬索桥锚碇基础的常规设计相比,考虑土体抗力的设计方案更符合实际工况,可为今后大跨度悬索桥锚碇基础设计提供一定的参考。Based on the finite element software Plxis 3D,this paper analyzes the structural optimization of the anchorage caisson foundation of Nanjing Xianxin Road Bridge.On the basis of the existing specifications,considering the interaction between the structure and the soil,the anti-sliding calculation,the anti-overturning calculation,and the foundation bearing capacity of the anchor foundation are calculated.The safety factor of the anchorage is calculated by increasing the main cable force proportionally.The results show that when the anchorage caisson foundation considers the soil resistance,the safety factor is significantly increased,and there is some room for further optimization of the anchorage foundation structure.Compared with the conventional design of anchorage foundations of suspension bridges,the design scheme considering soil resistance agrees more with actual working conditions,and this can provide a certain reference for the design of anchorage foundations of long-span suspension bridges in the future.

关 键 词：有限元 重力式锚碇基础 土体抗力 结构优化 

分 类 号：U443.24[建筑科学—桥梁与隧道工程]