Australiens / Norme néo-zélandaise 4600 pour les structures en acier formées à froid, 2018 Édition
L'AS/NZS 4600:2018 module checks cold-formed steel members with the Méthode de force directe. It runs in SkyCiv Structural 3D and supports custom restraints along each member.
Pour le 2005 edition, voir Conception des membres AS4600.
With this module you can:
- Run design checks to AS/NZS 4600:2018 with the Direct Strength Method, y compris:
- Member pre-qualification
- Axial tension
- Axial compression: section capacity, and member capacity for global, local and distortional buckling
- Bending about both axes: section capacity, and member capacity for lateral-torsional, local and distortional buckling
- Shear along both axes
- Combined bending and shear
- Compression et flexion combinées
- Tension et flexion combinées
- Design channels, Z sections, hat sections, back-to-back channels and lipped channel boxes, prismatic or non-prismatic
- Define custom restraints and pseudo-restraints along each member
- Export detailed step-by-step PDF reports
- Exécutez le concepteur SkyCiv (Run Designer) to find the most efficient section
Current version support
Sections
- le profilé en C
- Canal à lèvres
- Lipped Channel single
- Section Z
- Lipped Z
- la spécification fournit un traitement intégré de la conception de la résistance admissible
- Back-to-back Channels
- Back-to-back Lipped Channels
- Boîte de canal LIPPED
Back-to-back lipped channels and lipped channel boxes are supported only by this code. Sections can be prismatic or non-prismatic, and the material must be steel. Sections must not come from the Australian/Steel (250 Noter), Australian/Steel (300 Noter), Australian/Steel (Cher) or American/AISI databases.
To see this list in the software, open the log and click View supported sections.
Logiciel
- SkyCiv Structural 3D
AS / NZS 4600-2018 is also listed in the Code de conception dropdown of SkyCiv Beam. This page describes the module in SkyCiv Structural 3D.
Remarque
Units must be in Métrique to use this design module. In the Model, ouvert Paramètres (top bar) > Unités and set the unit system to Métrique.
Opening the module
- Solve the model.
- Cliquez sur Conception in the top bar.
- Dans Select a Design Module, choisir Cold-Formed Steel Member.
- Dans Which design code would you like to start?, pick AS / NZS 4600-2018, puis cliquez Commencer.
If a design module is already open, utilisation L'une des fonctions les plus exclusives des modules de conception SkyCiv est les rapports de conception des membres individuels qui sont disponibles en cliquant sur l'une des icônes de rapport sous la colonne Rapport pour chaque membre. dans le Conception menu to switch codes.
The design panel opens on the left, with the 3D model on the right. The header shows the code, plus Request Feature et Run Designer. On the right of the tab bar are three buttons:
- the settings (gear) bouton, which opens Member Design Settings
- the log button, which opens the Member Design Log
- Vérifier, which runs the design check
When the module starts, an alert may tell you that there are important messages. They are shown in the Member Design Log, for example "6 members were loaded with default values", or members that were not imported because their section or material isn’t supported. The log has a View supported sections lien.
The tabs are Détails, Les facteurs, Matériaux, Sections, Membrures, Contraintes, Charges et Résultats.
Member Design Settings
Click the gear button to open Member Design Settings. It has one option:
- Checks based on geometric axes instead of principal axes: unchecked by default. It affects the capacity of sections that are not symmetric about both axes, such as Z sections.
As the dialog notes, engineering guidance should be used when you change these settings. Cliquez sur sauver to apply.
Détails
Sur le Détails tab you can enter the project details. You don’t have to fill them in, but anything you enter is shown in the détails du projet table of your reports. Project Units shows Métrique and can’t be changed here.
Les facteurs
Ce logiciel Les facteurs tab shows the capacity reduction factors:
| Facteur | La description | Défaut |
|---|---|---|
| PhiC | Compression | 0.85 |
| PhiB | Pliant | 0.9 |
| PhiV | Tondre | 0.9 |
| PhiT | Tension | 0.9 |
If a member is not pre-qualified (Clause 1.6.3(c)(je)), PhiC, PhiB and ΦV are reduced to 0.8. The factors used for each member are listed in its report under Strength Limit State Factors, with their clause references.
Matériaux
Ce logiciel Matériaux tab lists the materials used by the designed members, with their Limite d'élasticité et Force ultime. The table is filled in from the model and can’t be modified here. To change a material, go back to the Model.
Sections
Ce logiciel Sections tab lists the sections used by the designed members. The section data comes from the model and can’t be modified here.
- Conception: tick the box to design the members that use this section. The icon in the column header toggles all rows.
- ID de section, Section, Forme, Identifiant du matériau et Matériau: taken from the model.
- DSM: Cliquez sur Visualisation to see the DSM factors of the section.
Ce logiciel DSM Factors for Section n dialog shows a sketch of the section with its axes, and the elastic buckling stresses (in MPa) used by the Direct Strength Method:
| Symbole | Buckling stress |
|---|---|
| Fle,l,c | Flambage local, compression |
| Fle,d,c | Flambage par distorsion, compression |
| Fle,l,boîte | Flambage local, bending about x |
| Fle,d,boîte | Flambage par distorsion, bending about x |
| Fle,l,par,- et fle,l,par,+ | Flambage local, bending about y (négatif et positif) |
| Fle,d,par,- et fle,d,par,+ | Flambage par distorsion, bending about y (négatif et positif) |
Any factor that is not provided has its check skipped. For a section that is symmetric about an axis, the positive and negative factors about that axis are not needed. The values can’t be edited here: to change them, aller au Générateur de sections and launch the Conception en acier formé à froid module.
Membrures
Ce logiciel Membrures tab lists the design members. Each design member is made up of one or more model members.
- Expand Table Width: widens the table.
- Split Selected et Join Selected: split the selected design members, or join them into one design member.
| Colonne | La description |
|---|---|
| Sélectionner | Ticks the row, for example to split or join members |
| Conception | Tick to include the member in the design check, untick to leave it out |
| Design Member ID | The ID of the design member |
| la direction de la travée n'a pas besoin d'être identifiée | The model member(s) that make up the design member |
| ID de section | La section(s) of the design member |
| L (m) | The length of the design member |
| Restraint ID | The restraint set used by the member. Click it to open that restraint in the Contraintes languette |
Design Member ID, la direction de la travée n'a pas besoin d'être identifiée, ID de section et L (m) come from the model and can’t be changed here. Effective lengths and K factors are not entered on this tab: they come from the Contraintes languette.
Contraintes
AS / NZS 4600:2018 supports custom restraints, so you can add your own restraints to be used in the calculations. For a full description, see our documentation on contraintes des membres.
- Groupe automatique: gives similar members the same restraint ID.
- Restraint ID: selects the restraint ID to view or edit. Use the down and up arrows to go to the next or previous ID.
- Assign to Member(s): assigns the current restraint ID to members.
- Dupliquer: copies the current restraint ID to a new ID.
The restraint table is filled in from the model supports and connections. Par exemple, a member supported at both ends gets a row at each end.
| Colonne | La description |
|---|---|
| Sélectionner | Ticks the row, for example to apply a standard restraint to it |
| Position | Distance of the restraint from the start of the member |
| Major Compression | 2-key restraint code (F or R) for major-axis flexural buckling |
| Kz | Effective length factor for the major axis (auto par défaut) |
| Minor Compression | 2-key restraint code (F or R) for minor-axis flexural buckling |
| Ky | Effective length factor for the minor axis (auto par défaut) |
| Lateral-Torsional | 4-key restraint code (F, R or S) for lateral-torsional buckling |
| Global Buckling Bracing | Unbraced, Haut, Bas ou Les deux. If the lateral-torsional restraint fully braces a flange, the global buckling check is skipped for the cases that the bracing covers. Hover over the ℹ icon for details |
| Supprimer | Deletes the restraint row |
Pour ajouter des pseudo-contraintes (restraints that are not modelled), enter the spacings in Ajouter des pseudo-restrictions par espacement(s) et cliquez Ajouter. You can enter a comma separated list (par exemple 1.5,1.5,1.5), use the multiply operator (4*1.5), or use the < operator to fit as many restraints as possible. Cliquez sur Supprimer next to Ajouter to remove all the pseudo-restraints.
Pseudo-restraints are added as released (RR et RRRR), so they have no effect until you change their codes. Dans l'exemple ci-dessous, 4*1.5 adds rows at 1.5, 3 et 4.5 m on a 6 m member, and their Lateral-Torsional code is changed to FFFR.
Below the table are sub-tabs, each with an A (automatic) badge by default:
- Tension: avec Default values sur, the defaults are used. Switch it off to enter your own:
- kt: correction factor for the distribution of forces in a tension member. The default assumes a non-uniform force distribution, per AS/NZS 4600:2018 Clause 3.2.3.2.
- An facteur: factor that reduces the gross area to the net area. La valeur par défaut est 0.85, which assumes a bolted connection.
- Major Compression (Lz, Kz), Minor Compression (LY, KY), Twist Compression (LX, KX), Major Lateral-torsional (Lb, kLT, Cb) et Minor Lateral-torsional (Lb, kLT): par défaut, Determine from restraints (as defined in the restraints table) est allumé. Switch it off to enter your own values for the whole member. Sous Standard Restraints, click an icon to apply a standard restraint to the selected rows.
Ce logiciel Contraintes section of each member report shows the restraints that were used: the user input (positionner, restraint codes, knon et khé, top and bottom flange restraint, member rotation and global buckling bracing), the major-axis and minor-axis compression segments, the compression twist segments, the effective lateral-torsional restraints and the segments for each load combination.
Charges
Ce logiciel Charges tab lists the load combinations from the model, with their Nom et Critères. Tick Appliquer for each load combination you want to include. Serviceability combinations are listed and can be ticked, but no serviceability check is performed.
Résultats
Cliquez sur Vérifier to run the design check. Ce logiciel Résultats tab shows:
- Afficher les rapports de conception pour: chooses which ratios are shown, par exemple Governing Result, Membres ayant échoué, or a single check.
- GOVERNING: the highest ratio and its member.
- A toolbar to filter (Tout), sort, copie, show the table and open the report, plus a Résumé button for the summary report.
- Ce logiciel Ratios de conception des membres table, avec un Statut (Passer ou Échouer) et un rapport icon for each member. Hover over the ℹ icon in a column header to see the clause it refers to.
| Colonne | Vérifier | Clause |
|---|---|---|
| P | Axial (traction ou compression) | 3.2 ou 7.2.1 |
| MX | Bending about x | 7.2.2 |
| MY | Bending about y | 7.2.2 |
| VY | Shear along y | 7.2.3 |
| VX | Shear along x | 7.2.3 |
| CSBX | Combined shear and bending, about x | 7.2.3 |
| CSBY | Combined shear and bending, about y | 7.2.3 |
| CCB | Compression et flexion combinées | 7.2.4 |
| CTBm | Tension et flexion combinées, member capacity | 7.2.5(1) |
| CTBs | Tension et flexion combinées, section capacity | 7.2.5(2) |
In the 3D view, each member is coloured Échouer, Avertissement ou Passer and labelled with its governing ratio.
Contrôles effectués
| Vérifier | AS / NZS 4600:2018 référence |
|---|---|
| Member pre-qualification (sets Φ) | Clause 1.6.3 |
| Axial tension, section capacity | Section 3.2 |
| Axial compression, section capacity | Section 7.2.1.3 |
| Axial compression, member capacity (global, local and distortional buckling) | Section 7.2.1 |
| Bending about x and y, section capacity | Section 7.2.2.3.2 |
| Bending about x and y, member capacity (lateral-torsional, local and distortional buckling), including positive and negative bending about y for singly symmetric sections | Section 7.2.2.1 |
| Shear along y (la toile) and along x (bride) | Section 7.2.3 |
| Combined bending and shear, À propos des deux axes | Eq. 7.2.3(9) |
| Combined axial compression and bending | Eq. 7.2.4 |
| Combined axial tension and section bending capacity | Eq. 7.2.5(2) |
| Combined axial tension and member bending capacity | Eq. 7.2.5(1) |
The module does not check slenderness limits, la flèche (facilité d'entretien), web crippling or torsion.
Rapports
Click the report icon in a member’s rapport column to open its design report. It opens in a Design Report for Member #n dialog with Close, Ouvrir dans un nouvel onglet, Télécharger HTML et Télécharger le PDF boutons. The report is titled "AS/NZS 4600-2018 – Direct Strength Method", and contains:
- détails du projet
- Utilitaire: every check with its reference, symbole, description, ratio et statut
- Sections: the dimensions and properties of the section
- États limites ultimes: Pré-qualification des membres, Strength Limit State Factors, Member Internal Actions, Member and Restraints, followed by each check step by step
Cliquez sur Résumé on the Results tab to open the Rapport sommaire. It lists the project details (including the design code), the strength load combinations with their factors, and the results for all members.
