ECSTAIR - Reinforced Concrete Staircase Design

This part of user manual describes how to use ECSTAIR for the design of Reinforced Concrete Staircase. 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
• ❹ Crack width and its limit

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

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Dimensions

This page allows to select the dimension of the slab.

Height of Staircase

Displays the height of the staircase based on number of risers present and height of each rise.

No of Risers in Flight

Select the number of risers in flight of staircase.

Rise

Enter the rise of the staircase.
↔ Range: 120 to 300 mm

Going

Enter the going of the staircase.
↔ Range: 120 to 300 mm

Length of Upper Landing

Enter the length of the upper landing of staircase.
↔ Range: 500 to 3000 mm

Length of Lower Landing

Enter the length of the lower landing of staircase.
↔ Range: 500 to 3000 mm

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Sizes

This page allows to select the thickness of the slab.

Waist Slab Thickness

Enter the thickness of the waist slab.
↔ Range: 75 to 500 mm

Upper Landing Thickness

Enter the thickness of the upper landing.
↔ Range: 75 to 500 mm

Lower Landing Thickness

Enter the thickness of the lower landing.
↔ Range: 75 to 500 mm

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Sizes - European

This page allows to select the thickness of the slab.

Waist Slab Thickness

Enter the thickness of the waist slab.
↔ Range: 75 to 500 mm

Upper Landing Thickness

Enter the thickness of the upper landing.
↔ Range: 75 to 500 mm

Lower Landing Thickness

Enter the thickness of the lower landing.
↔ Range: 75 to 500 mm

Width of Support (Upper)

Enter the width of the upper support.
↔ Range: 75 to 300 mm

Width of Support (Lower)

Enter the width of the lower support.
↔ Range: 75 to 300 mm

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Support Condition

This page allows to select the support condition of the staircase.

Upper Landing Support Condition

Select the support condition for upper landing.

Lower Landing Support Condition

Select the support condition for lower landing.

▽ Simple: Select this option to choose simple support condition.
▽ Continuous: Select this option to choose continuous support condition.

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Loads

This page allows to enter the load details.

Characteristic Imposed Load

Enter the characteristic imposed load.
↔ Range: 1 to 15 kN/m²

Characteristic Loads Due to Finishes

Enter the characteristic loads due to finishes.
↔ Range: 0 to 4 kN/m²

Imposed Load

Enter the factor for imposed load.
↔ Range: 1 to 3

Dead Load

Enter the factor for dead load.
↔ Range: 1 to 3

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Loads - European

This page allows to enter the load details.

Imposed Variable Actions

Enter imposed variable action.
↔ Range: 1 to 15 kN/m²

Permanent Actions for Finishing

Enter permanent actions for finishing.
↔ Range: 0 to 4 kN/m²

Partial Factor for Variable Action

Enter partial factor for variable action.
↔ Range: 0.5 to 3

Partial Factor for Permanent Action

Enter partial factor for permanent action.
↔ Range: 0.5 to 3

Quasi Permanent Value

Enter quasi permanent value.
↔ Range: 0 to 1

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Reinforcement

This page allows to enter the reinforcement details.

Size

Select size of the reinforcement for waist slab, upper landing and lower landing.
↔ Range: 4 to 50 mm

Spacing

Enter spacing of the reinforcement for waist slab, upper landing and lower landing.
↔ Range: 20 to 450 mm

Area

Displays area of the reinforcement provided for waist slab, upper landing and lower landing.

%

Displays percentage of the reinforcement provided for waist slab, upper landing and lower landing.

Clear Cover for Reinforcement

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

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Design Setting

Setting for various Design Data such as Material, Deflection 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 - British

Concrete Grade

↔ Range: 15 to 100 N/mm²

Main Reinforcement Grade

↔ Range: 200 to 600 N/mm²

Density of Concrete

↔ Range: 16 to 30 kN/m³

Materials - European

Compressive Cylindrical Strength

↔ Range: 12 to 100 N/mm²

Main Reinforcement Grade

↔ Range: 200 to 600 N/mm²

Density of Concrete

↔ Range: 16 to 30 kN/m³

Modulus Elasticity of Steel

↔ Range: 180000 to 260000 N/mm²

Aggregate Size

↔ Range: 10 to 40 mm

Deflection

Allowable L/d Ratio

↔ Range: 5 to 100

Material Safety Factors - British

Concrete in Compression / Concrete in Shear / Reinforcement

↔ Range: 1 to 2

Material Safety Factors - European

Concrete / Reinforcement

↔ 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 Crack Width

Select the maximum allowable value for crack width.

Nation 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.

k1

↔ Range: 0.3 to 0.5

k2

↔ Range: 1 to 1.5

k3

↔ Range: 0.3 to 0.6

k4

↔ Range: 1 to 1.5

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.