ECCORBEL - Reinforced Concrete Corbel Design

This part of user manual describes how to use ECCORBEL for the design of Reinforced Concrete Corbel. 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 Ultimate and Service Loads
• ❸ Allowable safety factors
• ❹ Crack width and its limit

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

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Dimensions

This page allows to enter the dimensions of the concrete corbel.

Width of Corbel - b

Enter the width of the corbel.
↔ Range: 50 to 2500 mm (1 to 100 in)

Horizontal Length - a

Enter the horizontal length of the corbel.
↔ Range: 20 to 1000 mm (1 to 100 in)

Distance from Load to Column Face - a_v

Enter the distance between vertical load and face of the column.
↔ Range: 20 to 1000 mm (1 to 100 in)

Free End Depth - h₁

Enter the depth of the corbel at the free end.
↔ Range: 20 to 1000 mm (1 to 100 in)

Overall Depth of Corbel - h

Enter the overall depth of the corbel.
↔ Range: 0 to 6000 mm (1 to 100 in)

Length of Bearing Plate - L_b

Enter the length of the bearing plate.
↔ Range: 50 to 1000 mm

Width of Bearing Plate - W_b

Enter the width of the bearing plate.
↔ Range: 50 to 1000 mm

If the overall depth of corbel and depth of corbel at free end are same, it will be considered as nib.

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Reinforcement

This page allows to provide the reinforcement details for the corbel.

Main

Area of Main Reinforcement - A_stp

Area of main reinforcement provided will be displayed based on the number of bars and diameter of the bar provided.

No of Bars - N_m

Select the number of main bars to be provided.
↔ Range: 1 to 10

Diameter of Bar - D_m

Enter or select the diameter of bar to be provided as main reinforcement.
↔ Range: 4 to 60 mm

Shear

Diameter of Bar - D_s

Enter or select the diameter of bar to be provided as shear reinforcement.
↔ Range: 4 to 60 mm

Spacing between Stirrups - L_s

Enter the spacing between the shear reinforcement.
↔ Range: 20 to 450 mm (1 to 50 in)

Cover

Clear Cover - C_c

Enter the clear cover for the reinforcement.
↔ Range: 15 to 80 mm (1 to 50 in)

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Loads

This page allows to enter the ultimate and service loads for the corbel design.

Ultimate Axial Load - V

Enter the ultimate axial load for the design.
↔ Range: 20 to 5000 mm (1 to 5000 in)

Ultimate Horizontal Load - T

Enter the ultimate horizontal load for the design.
↔ Range: 0 to 5000 mm (0 to 70000 in)

Service Axial Load - V_sl

Enter the service axial load for calculation of crack width, in case of British standard.
↔ Range: 20 to 5000 kN

Service Horizontal Load - T_sl

Enter the service horizontal load for calculation of crack width, in case of British standard.
↔ Range: 0 to 5000 kN

Quasi Permanent Moment - M_q

Enter the quasi permanent moment for calculation of crack width, in case of European or American standard.
↔ Range: 0 to 10000 kNm (1 to 5000 kip-ft)

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Design Setting

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

Materials - British Standard

This popup allows te enter design data for materials used in corbel design by British Standard.

Concrete Grade - f_cu

↔ Range: 12 to 100 N/mm²

Main / Shears Reinforcement Grade - f_y / f_yv

↔ Range: 200 to 600 N/mm²

Modulus of Elasticity of Steel - E_s

↔ Range: 100000 to 300000 N/mm²

Materials - European Standard

This popup allows te enter design data for materials used in corbel design by European Standard.

Concrete Grade - f_ck

↔ Range: 12 to 100 N/mm²

Main Reinforcement Grade - f_yk

↔ Range: 200 to 600 N/mm²

Modulus of Elasticity of Steel - E_s

↔ Range: 100000 to 300000 N/mm²

Materials - American Standard

This popup allows te enter design data for materials used in corbel design by American Standard.

Concrete Type - C_type

▽ Normal Weight: Select this option to consider normal weight concrete.
▽ Sand Light Weight: Select this option to consider sand light weight concrete.
▽ All Light Weight: Select this option to consider all light weight concrete.
▽ Other Weight: Select this option to enter concrete modification factor manually.

Concrete Modification Factor - λ

↔ Range: 0.75 to 1

Concrete Grade - f'_c

↔ Range: 14 to 100 N/mm² (2500 to 15000 psi)

Main Reinforcement Grade - f_y

↔ Range: 200 to 600 N/mm² (40000 to 80000 psi)

Density of Reinforced Concrete - w_c

↔ Range: 1400 to 2500 kg/m³ (90 to 160 lb/ft³)

Modulus of Elasticity of Steel - E_s

↔ Range: 50 to 300 Gpa (15000 to 40000 ksi)

Material Safety Factors - British

This popup allows te enter material safety factors considered in corbel design by British Standard.

Concrete in Compression - γ_mc

↔ Range: 1 to 2

Concrete in Shear - γ_mcs

↔ Range: 1 to 2

Reinforcement - γ_ms

↔ Range: 1 to 2

Material Safety Factors - European

This popup allows te enter material safety factors considered in corbel design by European Standard.

Concrete in Compression - γ_mc

↔ Range: 1 to 2

Reinforcement - γ_ms

↔ Range: 1 to 2

Crack Width

This popup allows to select options for crack width calculation.

☐   Check for crack width
Enable this option to include crack width check in calculation.

Maximum Allowable Crack Width - w_k

Select the maximum allowable value for crack width in case of British, European and American (Metric) Standards. In case of American (English) Standard, enter the limiting value for crack width.
↔ Range: 0.004 to 0.014 in

National Annex

This popup allows to select options for national annex in case of European Standard.

Nation

Select the nation based on which the coefficient value to be considered. The available standards are Recommended, UK, Finland, Ireland, Malaysia, Norway, Singapore, Sweden and User Defined.

User Defined

Select this option to enter the coefficient values.

k

↔ Range: 0.2 to 0.6

α_cc

↔ Range: 0.7 to 1.2

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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.