It is possible to design the
floor slab or raft foundation for punching due to concentrated loads
and reactions from columns, piles or supports. The design for
punching is carried out according to 4 different codes: ACI, DIN
1054, EC2 and ECP.
For rigid and elastic rafts, it
is convenient to determine the flexibility coefficient of interior
node at the characteristic point of the loaded area on that node.
While for flexible foundation, it is real to determine the
flexibility coefficient of interior node at that node.
Now it is possible to determine the flexibility coefficient of
the interior node due to a uniform load at that node (Figure
B-3):
-
at the characteristic point of the loaded area, where rigid
settlement equal to flexible settlement
-
at the midpoint of the loaded area, where maximum settlement
occurs
Earlier versions of ELPLA
determine flexibility coefficients for both interior and exterior
nodes by assuming uniform loaded areas on these nodes. This
assumption uses the principle of superposition for determining the
flexibility coefficients. Now it is possible to convert the loaded
areas on exterior nodes to point loads, Figure
B-3. By this way the program doesn't need to use the principle
of superposition in the analysis, making it much faster than the old
analysis. The new way of analysis is consequently faster and more
efficient for problems that contain a large finite element mesh.
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