马鞍山长江大桥根式锚碇基础设计

摘要

为了解决传统沉井基础力学性能的缺陷,提出了新型的根式锚碇基础.针对根式锚碇基础设计方案,利用现场试验数据对根式基础中根键的作用进行了分析.然后对根式基础进行了有限元分析,为设计提供数据支持.最后,对根式锚碇基础中根键部分进行设计简化计算,并为设计人员提供了简化的设计计算公式.研究表明,根键的压入能够大大提高基础的极限承载力,根式锚碇基础用于大跨度悬索桥是可行的.%In order to solve the defects of mechanical characteristics of traditional caisson foundation,a new type foundation is presented for the anchorages of suspension bridges, which is called the rootstalk foundation. According to the design plan, the field measured data is adopted to analyze the influence of rootstalks on the foundation. Then,finite element analysis of the rootstalk foundation is carried out to support the design of the rootstalk foundation. Finally, a simplified calculation formula is summarized for design engineers to calculate rootstalks.lt is shown that the rootstalk can obviously enhance bearing capability of the foundation, and the rootstalk foundation is reliable for the anchorages of long span suspension bridges.