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The beam to beam angle cleat connection allows for the design of up to two number flexible beam to beam, simple connections. As a simple connection, each joint is designed for the applied vertical shear force. Tying forces can also be specified as part of the disproportionate collapse design checks. The supported beams are assumed to to be perpendicular to the supporting beam, in line with the SCI Green Book design model.
The default set layout is for a beam on the left and right of the supporting beam, with partial depth end plates The initial shear force values are set at zero. The default screen layout is shown below.
The General area provides inputs to apply a title to the connection. along with inputs to control the supported beam connection. The General area also has a filter option to control the information displayed in the property editor to assist in the inputting and editing of information. The layout of the General area is shown below.
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Filter Properties - controls the display and contents of the property grid panel. The properties are selected by clicking in the row and selecting the required option from the drop down
Title - displays the input connection title. To enter a title, click on the row and input the required title.
Beam left - displays whether not a left side beam has been selected. The selection is made be clicking on the row and setting the required option from the drop down
Beam right - displays whether not a right side beam has been selected. The selection is made be clicking on the row and setting the required option from the drop down
The bolt details and angle grade area provides inputs to control the bolt grade and diameter, along with an input to define the grade of the angle cleat. The default layout of this area is shown below.
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Bolt Details - displays the currently selected bolt grade and diameter. The default bolts are grade 8.8, 20mm diameter bolts
Angle Grade - displays the currently selected steel grade for the angle cleats. The grade can be selected by clicking on the row and using the drop down to selected the required steel grade
To select the bolt grade and diameters, the Bolt Details row can be expanded by clicking on the arrow to the left of the row. This displays the following bolt parameter inputs.
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Bolt Grade - indicates the grade and diameter of the currently selected bolts
Bolt Diameter - indicates the selected bolt diameter. To select a bolt diameter, click to select the row and use the drop down options
Hole Dia - click to select and use the drop down options to select the required bolt diameter as a function of the selected bolt diameter
Slip factor - the slip resistance factor ks for preloaded bolts
Each row can be amended by clicking on the required row and using the drop down to select the required bolt parameter.
The Left Properties input area provides inputs to control the parameters of the left beam, including the applied shear force.
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Shear - the factored shear force on the left hand beam
Section - the currently selected beam section and steel grade
Cleat properties - the currently selected angel cleat dimensions
To define the left beam section, the Section row can be expanded by clicking on the arrow to the left of the row. The layout of the Section area is shown below.
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Steel Grade - display the currently selected steel grade
Section Type - shows the current section type. The default section is a UB
Section - displays the current section. The default is a 457x152UB67
Cell Depth - displays the overall depth for cellular or castellated beams. The default input is zero, meaning the section is based on the input Section only
To define the left hand side angle cleats, the Cleat Properties row can be expanded by clicking on the arrow to the left of the row. The layout of the Cleat Properties area is shown below.
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Number - the current set number of cleats. A connection can have 1 or 2 angle cleats.
Thickness - the current set thickness of the angle cleat
Web width - the width of the cleat at the supported beam web
Toe Width - the width of the cleat at the supporting beam web
Depth - the depth of the left hand angle cleat. A value of zero uses a default depth of 0.6 times the depth of the supported left hand beam
Left Web Bolts
The left web bolts area provides input to define the parameters of the bolts through the angle cleat and the left hand supported beam web. The Left Web Bolts area is shown below.
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Number of Rows - displays the current set number of bolts rows. An input of zero gives a default number of bolts rows based on the bolt centres and angle cleat depth
Top Edge Distance - the distance from the top of the angle cleat to the centre of the top bolt row. A value of zero gives a default based on the bolt diameter
Vertical c/c - the current vertical bolt centres.
Back Mark - the distance from the web face to the first line of bolts
Stagg Mark - the distance from the web face to the staggered or second line of bolts
Bolts in pairs - shows the current setting for staggered or bolts in pairs. To set, select the row and use the drop down
To set staggered bolts, the Stagg Mark must be set to a non-zero value, along with the Bolts in Pairs row being set to Bolts staggered if 2 per row. An input of zero in the Stagg Mark row means only a single bolt column per angle cleat will be defined. To set two bolts per row, the position of the second bolt in the row is defined using the Stagg Mark and the Bolts in Pairs row is then set to
Bolts in pairs if 2 per row.
Where a right hand supported beam has been selected, the main property grid will include input areas to allow the definition and set-up for the right hand beam, angle cleat and the bolts. The layout and functioning of these areas are as per the left hand beam and are, therefore omitted. For details, refer to the above section for the Left Properties and Left Web Bolts.
Toe Bolts
The Toe Bolts area provides inputs to control the parameters of the bolts through the toe of the angle cleat and the web of the supporting beam. The default layout of the Toe Bolts area is shown below
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Left: Number of bolts - the number of toe bolts in the angle cleat supporting the left hand beam
Right: Number of bolts - the number of toe bolts in the angle cleat supporting the right hand beam
Top Edge Distance - the distance from the top of the angle cleat to the centre of the top row of toe bolts
Vertical c/c - the vertical centres of the bolts
Horizontal c/c - the horizontal centre to centre of the bolt columns in the toe of the angle cleat. If a single angle cleat is used, the web to bolt column distance will be taken as half the input horizontal c/c distance
The supporting beam input area provides control for the parameters of the supporting beam. The default layout of the Supporting Beam area is shown below.
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Section - displays the currently selected beam section and steel grade.
Handed Channel - for use with a channel supporting beam. The orientation of the channel is chosen by selecting the row and using the drop down
Top Flange Offset - the offset of the top of the supporting beam relative to the tops of the supported beams. A positive value offsets the supporting beam downwards
Plate Offset - the offset of the end plate relative to the supported beams
Cantilever End Support - defines the supporting beam as a cantilever. This is used to check the shear force capacity of the supporting beam. To change, select the row and then use the drop down options
The Notches & Gap area provides inputs to define any notches in the top and/or bottom of the supported beams. The layout of the Notches & Gap area is shown below.
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Min Notch Depth Top - displays the current set minimum notch in the top of the supported beams
Min Notch Depth Bottom - displays the current set minimum notch depth in the bottom of the supported beams
Min Notch Length - displays the minimum notch length in the beams
Beam Gap - the currently defined gap between the end of the supported beam and the web of the supporting beam. An input of zero uses a default gap of the weld size plus 2mm
To input a specific value, select the appropriate line and then over-type the required value.
The Tie Force area provides an input to define the tie force for the disproportionate collapse design of the connections. The minimum tie force is 75kN.
In the case of a design to the British Standard, the tie force will be based on the greater of either 75kN or a percentage of the applied shear force on the connection, with the percentage of the shear force used being based on published guidance SCI P341. The percentage of the applied shear force to be used is set in the Connection Defaults Settings area.
For a connection design the BS EN 1993-1-8, the user must specify the value for the tie force check, subject to a minimum tying force of 75kN.