The design of a single block is explained in this article. If a single pile is enough, we can design with a single block. The design process for a single block is different from other designs.
Generally, the truss analogy is used for design. However, for a single pile, the design concept is not the same.
Let's look at the basic arrangement of the single post connected to the column.
During the construction of the mound we may not be able to erect the pole in the exact locations. Pile specifications generally considered a design tolerance of 75 mm.
A pile cap design needs to be prepared to this tolerance as this is stated in the specification and we cannot expect the pile to be erected in the exact location. After construction, the centers are measured and the tolerances are less than 75 mm. If they are within limits and we have designed the pile tops for an eccentricity of 75mm, then the pile top is acceptable.
In addition to sizing the tops of the piles, we need to size the floor joists for this eccentricity (75mm). On the floor beam is the position of the pile (Floor beam support; commonly considered stud support) can be moved 75 mm on both sides. We can create another arrangement to obtain the critical bending moment.
If the deviation is more than 75 mm, special attention should be paid and the design should be revised depending on site conditions.
Practical example of constructing a pile top plate
In this pile cap design example, we consider connecting a single pile and column through a pile cap.
Support load = 900 kN
Pile eccentricity = 75mm
Bending moment = Ne = 900 x 75/1000 = 67.5 kNm
Since we know how to stack block dimensions and individual block reinforcement can be calculated based on the relevant standard you need to comply with.
In general, the size of the top of the pile can be calculated as follows: = diameter of the pile + 150 x 2
Here the enlargement of the pile Hat pile . This value can be adjusted as desired. However, we generally kept it around 150mm.
Furthermore, when sizing a single block, the reinforcement for the ultimate limit state and the heap could be designed for crack control based on the crack design provided in the design.
