Steel Connection Designer - Apex Haunch

Create and customize an Apex Haunch connection

 

The apex haunch joint is commonly used for roof beams. It consists of two beams spliced with bolted end plates, and optional haunches attached at the top and/or bottom. The haunches are created from beams or plates.

Steel Connection Designer - Apex Haunch Connection

Joint elements

Apex Haunch Connection - Joint elements

You can customize each joint element using the available buttons from the Joint elements panel. All changes made in every window can be viewed in real time. For example, you can define the geometry of the plates and stiffeners, set the configuration of bolts and customize the welds (thickness, type and quality) for each part of the joint or add different elements.

Each parameter is illustrated by a corresponding image in the dialog box.

Steel Connection Designer - Apex Haunch Connection
Steel Connection Designer - Apex Haunch Connection

Another simple way to change the joint elements geometry is by modifying directly the dimension line values available in the views. This way, the joint geometry will be much easier to define by double-clicking on the editable dimension line values (without parentheses).

The dimension lines that contain values between parenthesis cannot be modified and correspond to the greyed-out values that appear in the element dialog. For example, the user can change the bolts positioning directly in the views for values that are not grayed-out in the bolts dialog.

 

Joint profile section

For each joint member (left beam, right beam), a drop-down list is available for selecting the desired “I” section or creating a new parametric “I” section (laminated or welded). Steel class can be also set for each joint member.

 

Steel Connection Designer - Apex Haunch Connection

The angle of the main connection members (beams) can be set by changing the End Point from Absolute to Relative coordinates.

Member length can be defined in two different ways: as absolute (real length) or projected length.

Steel Connection Designer - Apex Haunch Connection
Steel Connection Designer - Apex Haunch Connection

The Presets command is used to save a defined geometry of a joint: keep all the characteristics for bolts, stiffeners, plates and later apply them for other beams sections.

Plates and stiffeners

The Plates dialog of an apex haunch connection allows users to configure the right end plate and the left end plate.

Steel Connection Designer - Apex Haunch Connection

The available stiffeners used for this joint type are web stiffeners and beam stiffeners. The last type of stiffeners can be either haunches (plates or profiles) or plates, and can be set for both upper and lower side of the beam.

Steel Connection Designer - Apex Haunch Connection
Steel Connection Designer - Apex Haunch Connection
Steel Connection Designer - Apex Haunch Connection

Chamfers

The user is able to set chamfers for any of the available stiffeners. When there are no stiffeners enabled the chamfers dialog will be grayed and a message will be displayed in order to inform the user that there are no stiffeners created.

Beam plate stiffeners chamfers

Steel Connection Designer - Apex Haunch Connection
Steel Connection Designer - Apex Haunch Connection

Welds

The weld for each element can be customized by changing the weld size, weld type (Fillet, Full penetration or Partial penetration) and weld quality (Site, Shop or Shop continuous) that will further influence the weld verification results.

Steel Connection Designer - Apex Haunch Connection

 

For an Apex Haunch joint, it is possible to configure welds for both left beam flange and right beam to end plate, or for any of the available stiffeners, only when they are enabled.

Bolts

Joint connectors (bolts) can be customized by changing the available option: bolts definition, positioning, holes and plates type.

The bolt standard can be set by using the drop-down list. This selection will influence the rest of the options available: bolt material, bolt set (nut/washer number) and diameter.

Apex Haunch Connection - Bolts
Apex Haunch Connection - Bolts

The positioning tab will configure, for each group of connectors, the number and the distances depending on the selected bounds.

Depending on the member for which the holes are created, the user can set the Hole tolerance and Hole type (slotted, countersunk or round), or enable the Backing plate option for each group of connectors.

Apex Haunch Connection - Bolts

Design assumptions

After defining the joint elements, the users have the possibility to choose the material for each element according to different standards and set the following steel design assumptions: steel corrosion, control of the shear plane for bolts (threaded/ unthreaded), weld design method, T-stub method and tensioned zone limit and give values for the safety factors that will influence the calculation results.

Apex Haunch Connection - Design assumptions

Definition of load cases and combinations

Users have the possibility to define load cases, load combinations and add values for the loads (N - axial force, M – bending moment, V- shear force). The sign convention is displayed in the Loads dialog for each joint type.

It is possible to set manually the combination coefficient or automatically generate combinations according to the Eurocode 0.

The users can add different load cases from the available list. Also, the envelope load case doesn’t require any combination, because it is interpreted as a special load case that has the meaning of a combination which consists only of the maximum value of the efforts. For example, the user can define an envelope case that can provide the maximum axial force, maximum shear force or maximum bending moment.

Apex Haunch Connection - Definition of load cases and combinations
Apex Haunch Connection - Definition of load cases and combinations

Calculation results

For the calculation of connections, BD Steel Connection uses Eurocode 3 international design standards, for all the connection components verification: bolts, welds, end plates, stiffener plates, etc. and parts of the connected elements, beams web and flanges.

The module can generate a report which contains a range of chapters that describe the calculation theoretical formula, the calculation results and work ratio for each verification.

Apex Haunch Connection - Calculation results

From a list, the chapters to be included in the report can be chosen. Here is an example of the main verification chapters that appear in the generated report.

Apex Haunch Connection - Calculation results

For each verification, the Calculation results tab displays: the work ratio, resistance, effort and combination. Above is an example of calculation results for a moment end plate.

Apex Haunch Connection - Calculation results
Apex Haunch Connection - Calculation results

Errors and warnings may appear in the console during this stage, whenever there are failed verifications, hole distances conditions that are not satisfied, or other joint design problems.

The Generate command available in the ribbon creates the report in .doc or .pdf file. With the Preview command, users can generate a report by selecting one of the available templates, or creating a new report using the Report Designer.

Generic detail view

The user can obtain a generic connection drawing (elevation and sections), which can further be exported and adjusted in other CAD software

Apex Haunch Connection - Generic detail view
Apex Haunch Connection - Generic detail view

The Drawing Settings dialog is used for customizing the drawing. Here, the user can set the page layout and the title blocks, disable different views (sections/elevation) in the drawing, change the section symbols and the scale for each view. The print margins can be set when printing the generated drawing.

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