|Example 23: Settlement calculation for a rigid raft subjected to an
Description of the problem
In many cases, it is required to determine the settlement
under an abutment, a bridge pier, a building core or a raft of thick thickness. In these cases,
the foundation will be assumed as rigid foundation.
As an example for rigid rafts, consider the rectangular raft
of a core from concrete walls shown in Figure 55 as a part of 93.0 [m] structure. The length of
the raft is L
= 28.0 [m], while the width is B
= 25.0 [m]. Due to the lateral applied
wind pressure, the raft subjected to an eccentric vertical load of
P = 142000 [kN]. Figure 55 shows
section elevation through the raft and subsoil, while Figure 56 shows a plan of the raft, load,
dimensions and mesh.
It is required to estimate the expected settlement if the raft is
considered as perfectly rigid.