ECTHREEPILE - Reinforced Concrete Pilecap Design

This part of user manual describes how to use ECTHREEPILE for the design of Reinforced Concrete Pilecap. ECPlus applications are designed as wizard type which is a step by step guided input procedure. If you are new to ECPlus applications, click here for general guidance.

Prerequisites: The user is expected to have a basic understanding of foundation design concepts.
The minimum input data required to use this application is as follows:

• ❶ Dimension and Material Properties
• ❷ Concrete and Reinforcement Grades
• ❸ Allowable safety factors

Following sections are presented with various input pages of ECTHREEPILE application with descriptions:

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Pile cap

This page allows to select the dimensions of pilecap.

Pile Geometry - P

Select the geometry of the pile.
▽ Circle: Select this option to choose circular piles.
▽ Square: Select this option to choose square piles.

Pile Diameter - D

Enter the diameter of the pile.
↔ Range: 100 to 2000 mm

Spacing of Piles - s

Enter the spacing between the piles.
↔ Range: 300 to 5000 mm

Pile cap Overhang - e

Enter the pile cap overhang.
↔ Range: 50 to 1500 mm

Thickness of Pile cap - h

Enter the thickness of the pilecap.
↔ Range: 300 to 5000 mm

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Column

This page allows to select the dimensions of column over the pilecap.

Column Geometry - C

Select the geometry of the column.
▽ Rectangle: Select this option to choose rectangular column.
▽ Circle: Select this option to choose circular column.

Column Dimension - X Direction - x

Enter the dimension of column in X direction.
↔ Range: 150 to 2000 mm

Column Dimension - Y Direction - y

Enter the dimension of column in Y direction.
↔ Range: 150 to 2000 mm

Eccentricity - X Direction - e_x

Enter the eccentricity of column in X direction.
↔ Range: -1000 to 1000 mm

Eccentricity - Y Direction - e_y

Enter the eccentricity of column in Y direction.
↔ Range: -1000 to 1000 mm

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Reinforcement

This page allows to select the reinforcement details for the pilecap.

Size

Enter the size of the reinforcement.
↔ Range: 6 to 50 mm

Spacing

Enter the spacing of the reinforcement.
↔ Range: 20 to 450 mm

Area

Displays the area of the reinforcement provided based on the size and spacing of reinforcement provided.

%

Displays the percentage of reinforcement used based on the size and spacing of reinforcement provided.

Clear Cover - C_ot

Enter the clear cover for reinforcement.
↔ Range: 15 to 80 mm

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Design Loads

This page allows to select the load details for the pilecap.

Factored Axial Load - F_ult

Enter the factored axial load.
↔ Range: 50 to 15000 kN

Un-factored Axial Load - F_work

Enter the un-factored axial load. This un-factored load is used to calculate the service load on pile to check if it is within the allowable pile capacity.
↔ Range: 50 to 10000 kN

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Design Setting

Setting for various Design Data such as Material and Safety Factors are presented in this section. This setting pop-up can be accessed by clicking the bottom panel below the left navigation.

Materials

Concrete Grade - f_cu

↔ Range: 15 to 100 N/mm²

Main Reinforcement Grade - f_y

↔ Range: 200 to 600 N/mm²

Density of Concrete - γ_con

↔ Range: 16 to 30 kN/m³

Concrete in Compression / Concrete in Shear / Reinforcement
γ_mc, γ_mcs, γ_ms

↔ Range: 1 to 3

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Error Handling

Errors and Warnings are generated to prevent any inadvertent error in the input data. This section describes how to handle the errors and warnings. These errors are displayed at the bottom of the input page when the data in one or more input fields invalidate each other.