单桩基础、地基梁与框架共同作用

针对山区高层建筑常采用一柱一桩，桩端为起伏变化基岩等条件，依现行桩基规范，采用m值法确定桩周地基弹性抗力系数，计算单桩桩顶的柔度、刚度矩阵；采用有限元法建立地基与地基梁总刚度矩阵；按逐步扩大子结构分析方法，分别对单跨地基梁、上部框架结构荷载及刚度的凝聚，求得两者各在桩顶处的边界结点等效荷载、等效刚度矩阵。然后按桩、地梁、框架柱在桩顶处变形协调条件建立整体刚度矩阵。对不同桩基条件下进行具体分析。上述方法还适用于其它上部结构或下部结构。

The Action Together of Single Pile,Base Beam and Fram

The principle of substructure analysis of the matrix displacement method is used to condense superstructural stiffness of tall building to the boundary stiffness of the foundation beams.The subsoil mode of the layers summation procedure of finite compressible layer is introduced herein.The flexibility matrix of the subsoil at the interface is attained by means of the integral transformation if settlement at the interface of the subsoil acted with rectangular loading.When conditions of the deflection compatibility and the boundary restrain at the interface are satisfied,a set of the matrix equations of displacement of the foundation beam is made equivalent to the actual conditons,thus the calculation is simplified.