某地下室筏板柱下墩的优化设计

本文以带柱下墩的平板式筏板基础为例,在进行某地下室筏板柱下墩有限元分析时,利用地质勘察报告中的参数计算基础实际沉降,从而反推等效基床系数K,结合K值采用弹性地基梁板法对筏板进行有限元分析。同时对该基础采用倒楼盖法进行有限元分析,就这两种方法计算得到的配筋进行比较,并在保证一些参数不变的前提下,观察柱墩厚度的变化对筏板内力分布和配筋的影响。分析表明,适当增加柱墩厚度能优化筏板的配筋。

Finite Element Analysis on the Under Column Pier of Raft Foundation in Basement

This paper takes the flat raft basement of under column pier as an example. When the finite elements of raft column pier is analyzed, the basic actual settlement is calculated geological with data from survey to inverse the coefficient of subgrade reaction K and the beam on elastic foundation method is adopted to make finite element analysis on valve plate. In the meantime, the inverted floor calculation method based on the assumption of rigid upper structure is employed. The two reinforcing bars from above methods are compared. Under the premise that some parameters are unchanged, the effect on internal force distribution of valve plate and reinforcing bars from the change of column pier thickness is observed. The analysis indicates that the raft's reinforcement can be optimized through the proper enhancement of the thickness of column pier.