CSI SAFE Professional Essential Training Series

Features and defining of materials like Concrete, Reinforcement etc.... Further defining of Footing and Stiff Column Thicknesses..

CSI SAFE - 02 Define Beam Properites.

Attachment of Excel Sheets

1- Pile Cap Design Calculations for CSI SAFE

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2-Pile Capacity Analysis Software

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Details for Pile Cap design

A pile cap is one of the types of foundation that consist of a thick concrete pad that is usually supported by piles. This is commonly used in building foundations with the geographical locations having a very low soil bearing capacity. Pile cap serves to transmit the load of the building into the hard strata of the soil via a pile or group of piles. Design-wise, the pile cap design uses a truss system principle that can be designed using a strut and tie method. Designing a pile cap seems to be complicated because a lot of considerations need to take into account to achieve a safe and sound foundation.  These considerations include the proper spacing of each pile, the pile cap thickness and so on. To achieve this can only be done by understanding its design principles and proper detailing of pile caps. The designer’s struggle on pile cap design begins with the consideration of what dimensions or pile cap geometry to assume at first. But knowing the correct pile cap dimensions can be considered as a halfway already in design completion.

In this article, we will be dealing with the standards in determining pile cap geometry and dimensions as well as its design considerations. To make it simple, we will break down our design assumption with the following

1.  Recommended Shape and Its Dimensions

The first thing to consider in the pile cap design is to determine the shape of the pile cap to use. The shapes vary according to the number of piles in the pile cap that can be deriving according to the load in a column supporting it. The figure below shows the most common use shapes of the pile cap and the recommended dimensions.

2. Recommended Thickness of Pile Cap

One of the important things to consider in a pile cap design is to determine enough thickness. Pile cap thickness must also be sufficient to meet anchorage-bond length requirements of starter bars and normal punching shear requirements. Here is how to assume the thickness of the pile cap:

If diameter of pile less than 550mm: thickness = 2 x diameter of pile

If diameter of pile greater than 550mm: thickness = 1/3[(8 x diameter of pile)-600]

3. Punching Shear Check

Punching shear along the column perimeter should be satisfied according to the standard codes.  Also, punching shear due to piles should also be considered in the design check.

4. Pile Cap Design Approach

There are so many ways to design a pile cap. Technically, it can be designed manually using a principle of strut and tie method. But if you are considering a wide pile cap supported by multiple numbers of piles, computer-generated structural design CSI SAFE software is available to design a massive pile caps.

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