基于剪切位移法的桩基承台梁分析

Analysis of Pile Capping Beam Based on Shear Deformation Method

为探讨桩基承台梁中桩-土-承台梁的相互作用,首先基于剪切位移法得出G ibson地基中刚性桩与非刚性桩桩顶荷载与桩顶位移之间的关系矩阵,通过综合方法获得承台梁的总刚度矩阵,进而获得桩基承台梁上外力与桩顶位移的关系矩阵,并编制出相应的VB计算程序。最后,基于所建立的模型和编制的计算程序,结合某算例分析了桩距、承台梁刚度对承台梁下各单桩桩顶荷载的影响,以及桩基的压缩性对各单桩桩顶位移的影响。结果表明桩距会起到调整各桩桩顶荷载的作用,承台梁存在着一个合理刚度。

In order to investigate the interaction of pile-soil-beam in the pile capping beam,a matrix connecting load and deformation on the heads of rigid piles and compressible piles in Gibson subgrade was obtained based on shear deformation method.The total stiffness matrix of the pile capping beam was constructed by integrating method,the matrix connecting external force and pile head deformation was established,and the corresponding Visual Basic calculation program was developed.According to the developed model and calculation program,the influences of the factors such as pile spacing and pile capping beam＇s stiffness on the load distributed on each single pile under pile capping beam and the compressibility of piles on deformation of each single pile head were discussed respectively with a practical calculation example.The results indicate that the pile spacing can adjust the load distributed to each single pile,and the pile capping beam has a reasonable stiffness.