ECBASEPLATE - Column Base Plate Fixed Design

This part of user manual describes how to use ECBASEPLATE for the design of Column base plate fixed. 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 column baseplate design concepts.
The minimum input data required to use this application is as follows:

• ❶ Structural Steel Section
• ❷ Baseplate Size
• ❸ Bolts and Anchorage
• ❹ Design Loads and Moment

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

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Design Options

This page allows to select the design standard and the unit.

Design Code

Select the relevant Code Standard for design.
Available Standard Codes: ☉ British, ☉ European and ☉ American.

American design Standard has option to select the design method:
☉ LRFD or ☉ ASD

British and European Standards are not available in the current version.

Unit

It displays the active unit. The unit   Change   button is displayed when ☉American Standard is selected.

Design Unit Change

Click this button to open the unit change pop-up dialog.

☐  Reset all Input Data
This option will reset the input data for the new unit. This option is recommended if the job is new and no input data has been entered yet.

☐  Convert Dimensions and Properties
This option allows to convert all the previously entered input data except Load data to the new unit.

☐  Convert Loads
This option allows to convert previously entered load data to the new unit.

Note: Both Convert Dimensions and Properties and Convert Loads options can be used simultaneously to convert all the previously entered input values to the new unit.

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Column and Base Plate

This page allows to select column section and enter the base plate details.

Type

Select the option between Standard, I Sec - User, RHS Sec - User or SHS Sec - User.
▽ Standard: Select this option to design base plate per British, Euro or American Standard.
▽ I Sec - User: Select this option for Base plate to assign as user defined I Section.
▽ RHS Sec - User: Select this option for Base plate to assign as user defined RHS Section.
▽ SHS Sec - User: Select this option for Base plate to assign as user defined SHS Section.

Steel Section Table

By choosing the Type as  Standard  , the Cross-sectional properties will be displayed for the selected Section. To change the selected Section, click button, a pop-up dialog box displays a list of standard section based on option listed in menu  Section Table  &  Cross Section 

▽ Section Table:

Select this option to have list of Standard British, European or AISC Sections.

▽ Cross Section:

This option allows user to select wider or narrow flange beam like UB, UC, IPE, HE, W, M, etc., based on selection at  Section Table  menu.

▽ Filter:

Based on name by user and with option selected at  Section Table  and  Cross Section , a filtered member list will be displayed.

I Sec User

By choosing the Type as  I Sec User , enter Cross-sectional properties.

Overall Depth - D

Enter overall depth of the section.
↔ Range: 50 to 1500 mm (1.5 to 60 inches)

Flange Width - B

Enter the flange width of the section.
↔ Range: 50 to 1500 mm (1.5 to 60 inches)

Flange Thickness - T

Enter the thickness of flange of the section.
↔ Range: 3 to 100 mm (0.1 to 4 inches)

Web Thickness - t

Enter the thickness of web of the section.
↔ Range: 2 to 100 mm (0.05 to 4 inches)

RHS Sec User

By choosing the Type as  RHS Sec User , enter Cross-sectional properties.

Overall Depth - D

Enter overall depth of the section.
↔ Range: 50 to 1500 mm (1.5 to 60 inches)

Flange Width - B

Enter the flange width of the section.
↔ Range: 50 to 1500 mm (1.5 to 60 inches)

Member Thickness - t

Enter the member thickness of the section.
↔ Range: 2 to 100 mm (0.05 to 4 inches)

SHS Sec User

By choosing the Type as  RHS Sec User , enter the Cross-sectional properties.

Overall Depth - D

Enter overall depth of the section.
↔ Range: 50 to 1500 mm (1.5 to 60 inches)

Member Thickness - t

Enter the member thickness of the section.
↔ Range: 2 to 100 mm (0.05 to 4 inches)

Major Axis

Select the option between Z-Axis and X-Axis,
This is the column orientation in the structural analysis model from which the loads are imported to the design. Orientation will affect the direction of the loads/reactions that will be considered for the baseplate design.

Base Plate

Length / Breadth of Base Plate - L_pl / B_pl

Enter the length / breadth of the base plate. Length is the dimension along the depth of the column section.
↔ Range: 200 to 2000 mm (8 to 80 inches)

Thickness of Base Plate - t_pl

Enter the thickness of the base plate.
↔ Range: 3 to 50 mm (0.1 to 6 inches)

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Bolts and Anchorage

This page allows to enter bolt and anchorage details.

Holding Down Bolts

Bolt Grade - f_b

Select the grade of bolt from the drop down list.

Bolt Yield / Ultimate Strength - Y_b / U_b

Displays yield / ultimate strength of bolt based on bolt grade. Enter bolt yield / ultimate strength in case of user defined bolt grade.
↔ Range: 100 to 1000 N/mm² (15 to 145 ksi)

Bolt Size - d

Select the size of bolt from the drop down list.

Number of Bolts - N_b

Select the total number of bolts from the drop down list. Available number of bolts are ▽ 4, ▽ 6 and ▽ 8

Horizontal / Vertical Edge Distance - e_x / e_z

Enter horizontal / vertical edge distance of holding down bolt.
↔ Range: >= 0 mm (>= 0 inches)

☐  Washer Plates welded to BP: Check this option if washer plates are welded to the base plate. When this option is selected, all bolts are considered to resist the shear force. If not checked, only the bolts on one side are considered effective to resist applied shear.

Bolt Anchorage

Click this button to open the bolt anchorage pop-up dialog.

Anchorage

Select whether anchorage is ▽ Defined or ▽ Not Defined from the drop down.

Anchorage = Defined

Reinforcement Ductility Effect

Check if reinforcement ductility is ▽Considered or ▽Not Considered from the drop down. If reinforcement ductility is selected, the reinforcement shall be defined in the pedestal page.

☐  Use default anchor dimensions based on bolt dia: Check this option to use predefined anchor plate dimensions based on size of anchor.

Embedment Depth - E_b

Enter the embedment depth of anchor plate.
↔ Range: 150 to 3000 mm (5 to 120 inches)

Width of Anchor Plate / Nut - b_a

Enter the width of the anchor plate / nut.
↔ Range: 0 to 300 mm (0 to 10 inches)

Thickness of Anchor Plate / Nut - t_a

Enter the thickness of the anchor plate / nut.
↔ Range: 0 to 100 mm (0 to 15 inches)

Anchorage = Not Defined

Anchorage Tension / Shear Capacity - C_t / C_s

Enter the anchorage tension / shear capacity of the bolt.
↔ Range: 0 to 5000 kN (0 to 1125 kips)

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Pedestal

Length / Breadth - L_p / B_p

Enter the length / breadth of the pedestal.
↔ Range: 250 to 1500 mm (10 to 50 inches)

Height - H_p

Enter the height of the pedestal.
↔ Range: 150 to 2000 mm (5 to 75 inches)

Clear Cover for Pedestal - C_ped

Enter the clear cover for pedestal.
↔ Range: 15 to 150 mm (0.5 to 6 inches)

Anchorage Reinforcement

Click this button to open the anchorage reinforcement pop-up dialog.

Tension

Size (mm)

Enter the size of main reinforcement.
↔ Range: 4 to 60 mm

Nos

Select the number of main reinforcement from the drop down menu.
↔ Range: 1 to 4 Nos

Shear

Size (mm)

Enter the size of ties per bolt.
↔ Range: 4 to 60 mm

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Loads

Click this button to open the factored load combinations popup to enter input for different load combinations. Loads are entered as force in X, Y, Z directions and moment about X (longitudinal axis) and Z (transverse axis) directions.
F_x / F_y / F_z
↔ Range: -100000 to 100000 kN (-100000 to 100000 kips)
M_x / M_y / M_z
↔ Range: -100000 to 100000 kN-m (-100000 to 100000 kips.in)

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Weld

☐  Weld Check: Check this option to include weld check.

Flange / Web - Base Plate Weld Size - S_f / S_w

Enter the base plate weld size for flange / web.
↔ Range: >= 0 mm (>= 0 inches)

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Design Setting

Setting for various Design Data such as Steel grade, Reinforced concrete properties and Weld strength properties. This setting pop-up can be accessed by clicking the bottom panel below the left navigation.

Steel Properties

Steel Properties

Column / Base Plate Yield Strength - f_yc / f_yb

↔ Range: 200 to 500 N/mm² (25 to 75 ksi)

Weld

Weld Strength - EC

↔ Range: 300 to 800 N/mm² (20 to 150 ksi)

Reinforced Concrete Properties

☐  Use Built up Grout pads: Check this option to use built up grout pads. When this is checked, the shear strength of the anchor bolt is reduced according to clause 17.7.1.2.1. This is to include the effect of anchor bolt bending that might arise due to cracking of grout.

Compressive Strength of Concrete - f'_c

↔ Range: 15 to 100 N/mm² (1 to 15 ksi)

Yield Strength of Reinforcement - f_y

↔ Range: 150 to 2000 N/mm² (20 to 300 ksi)

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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.