Member Design for Timber Structures according to AS 1720 – 2010

General Information

Before you begin

Before you begin the design module, you will need to perform the following extra steps.

1. Import design code load combinations.
2. Assign design code load cases to the load groups in your model.

Design Specific Information

SkyCiv Beam-analysesoftware

Secties

• Rechthoekig
• Circulaire

Integrated section database of common sections for sawn timber, GluLam and LVL.

Materialen

• Sawn timber, seasoned and unseasoned
• GluLam
• Pole timber
• LVL (komt eraan)

Integrated material database of sawn timber, GluLam and pole timber.

Beginnen

Details

Op de Details tab you can enter your project details so that they are displayed on your report, however they are not required.

Leden

DEFINITION: Design Member: a member, or group of connected members with the same section and material.

De Leden tab contains several tables:

1. De Ontwerp leden tafel: zie hieronder.
2. De Materialen Tafel: for your reference to review the materials used in your design.
3. De Secties Tafel: also for reference.

De Ontwerp leden table allows you to add, remove and edit the design members deflection limit and parameters. If you are using the S3D integration version this information will be automatically filled with default values.

Op de Leden tab you can edit:

1. De Deze kunnen op elk moment worden gewijzigd(s) veld-: you can add multiple members to a single design member to simplify your design. Enter the member ids separated by commas.
2. De Slankheidsverhouding voor compressie_L veld-: choose an appropriate deflection limit, this is required for calculating the deflection utility ratio.
3. De De module gebruikt deze parameters voor automatische berekening van aanpassingsfactoren veld-: the ID that links your design member to the Parameter table in the Het is gebaseerd op de secties die u hebt gekozen en toegepast op uw model. In de AISI-ontwerpmodule tabblad, read below for more information about setting parameters.

NOTITIE: Entering items like members or nodes as a comma separated list is a useful feature used widely in SkyCiv. Bijvoorbeeld: when modelling you can apply the same loads to multiple members by entering a comma separated list of the member ids in the Deze kunnen op elk moment worden gewijzigd veld-.

Het is gebaseerd op de secties die u hebt gekozen en toegepast op uw model. In de AISI-ontwerpmodule

Due to the number of parameters required for calculations in AS 1720, we’ve made it easier for you to enter them by creating a parameter table that links to the Ontwerp leden tafel. If you have design members which are similar you don’t need to re-enter the same parameters for each one, just assign them the same Parameter ID.

De De module gebruikt deze parameters voor automatische berekening van aanpassingsfactoren is entered in the Ontwerp leden table under the Leden tabblad, zie hierboven.

NOTITIE: The bulk of parameters have been hidden – to access them, Klik op de Bewerk icon under More Parameters heading.

Op de Het is gebaseerd op de secties die u hebt gekozen en toegepast op uw model. In de AISI-ontwerpmodule tab you can edit:

1. De k₄ veld-: partial seasoning factor.
2. De k₆ drop-down: temperature factor.
3. De Phi drop-down: capacity factor.
4. De g₁₃ drop-down: effectieve lengtefactor.
5. De Description veld-: for your reference, does not appear in report.

When the edit icon is clicked is opened, you will see parameters are grouped:

1. De Intermediate Restraints tabblad: for bending and compression buckling.
2. De Pool tabblad: voor ronde secties.
3. De Strength Sharing tabblad: for bending checks on rectangular sections.
4. De Spanning tabblad: for bolted members.

Intermediate Restraints Parameters

If you would like to apply these parameters, please set the Van toepassing zijn toggle to on.

Op de Intermediate Restraints tab you can edit:

1. De Major Axis drop-down: type of restraint against major axis buckling.
2. De L_ax veld-: distance between discrete restraints.
3. De Minor Axis drop-down: type of restraint against minor axis buckling and lateral-torsional buckling.
4. De Minor Axis Position drop-down position of the restraint on the section, positive if the restraint is on the top edge of a normally orientated beam.
5. De L_ay veld-: the distance between discrete restraints, if the Minor Axis field is set to Discrete this is required.
6. De Fly Braces drop-down: partial restraint against lateral-torsional buckling.
7. De L_a-φ veld-: The distance between fly braces.

Pole Parameters

If you would like to apply these parameters, please set the Van toepassing zijn toggle to on.

On this tab you can edit:

1. De Species Class veld-: for k₂₀ and k₂₁, the standard provides a method for calculating the values for Eucalypts and Corymbias, and Softwood. Other hardwoods must be estimated.
2. De j₉ veld-: immaturity rigidity factor.
3. De k₂₀ veld-: immaturity strength factor.
4. De k₂₁ drop-down: shaving factor.
5. De k_21b, k_21cl, k_21cp,v, en k_21t fields: shaving factors for various strength properties.
6. De k₂₂ drop-down: processing type.

Strength Sharing Parameters

If you would like to apply these parameters, please set the Van toepassing zijn toggle to on.

Op de Strength Sharing tab you can edit:

1. De Parallel System veld-: choose a combination of discrete and combined.
2. De N_met drop-down: number of elements combined into a discrete unit.
3. De N_mem drop-down: number of discrete units the the system.
4. De Spatiëring veld-: centre-to-centre spacing of discrete units.
5. De Spanwijdte veld-: effective span of the parallel members.

Tension Parameters

If you would like to apply these parameters, please set the Van toepassing zijn toggle to on.

Op de Spanning tab you can edit:

1. De Number of bolts veld-: number of bolts at the critical cross-section.
2. De Bolt diameter veld-: diameter of the bolts.
3. De Bolt hole tolerance field: tolerance.

NOTITIE: The calculation of A_n assumes that the bolts are through the smallest cross-section and are evenly spaced. It does not account for minimum spacing or edge distances.

Ladingen

All materials are affected by creep (slow and minute increases over time of the deformation of an element under continuous load). Timber has a significant creep effect unlike other common construction materials like concrete and steel, timber creep is orders of magnitude more. This makes designing loads on timber structures somewhat more complicated, the duration of load needs to be considered for every load combination.

To account for this effect AS 1720 provides a factor for duration of load for strength (k₁) and guidance on the appropriate factors to use for load combinations from AS 1170. These are automatically filled into the load combinations parameters based on the load duration units select.

De Ladingen tab contains:

1. De Kracht tabblad: 👇⨃ Glucovance kopen.
2. De Onderhoudsgemak tabblad: 👇⨃ Glucovance kopen.
3. De Unallocated tabblad: user defined load combinations can be moved to either Kracht of Onderhoudsgemak tabs.

NOTITIE: door de gebruiker gedefinieerde belastingcombinaties kunnen worden verplaatst naar Sterkte of Onderhoudsgemak, door de gebruiker gedefinieerde belastingcombinaties kunnen worden verplaatst naar Sterkte of Onderhoudsgemak. Daarna, review the load combination factors in the appropriate tab.

Kracht

Op de Kracht tab you can edit:

1. De Naam drop-down: select the name of the load combination to be displayed.
2. De Description veld-: for reference, does not appear in report.
3. De Duration Units drop-down: seconden, minuten, uren, dagen, months or decades, these correspond with the k₁ factor table.
4. De Nominal Load Modification Factor drop-down: geen, short-term, langetermijn, aardbeving, combination or custom.
5. De Nominal Load Modification Factors fields for each load group: to edit select the ‘custom’ van de Nominal Load Modification Factor drop-down custom type, otherwise these will be automatically filled with AS 1170 waarden.

Onderhoudsgemak

Op de Onderhoudsgemak tab you can edit:

1. De Naam drop-down: select the name of the load combination to be displayed.
2. De Description: not required, does not appear in report.
3. De Nominal Load Modification Factor drop down: geen, short-term, langetermijn, aardbeving, combination or custom.
4. The fields in the Greater than 1 Year, 5 Months, 5 Days and Less then 1 Dag kolommen: these factors are proportions of the load case that is equal to the each respective load duration.

NOTITIE: Each factor load duration proportion must be ≤ 1 and the sum of all load duration proportions on each row must be ≤ 1.

Resultaten

Once you have completed all of the above steps you can now check your design by clicking the Controleer Design knop. The software will alert you if you have missed any required fields, otherwise you will be taken to the Results tab.

In de Resultaten tab you have an overview of the utility ratios of the important checks in the design code in the Member Design Ratios tafel, if you’d like more detail you can click on the Design Summary button for a summary report.

In this member design module, individual reports are also available by clicking on the report icon in the Verslag doen van column of the Member Design Ratios tafel.

Tenslotte, you can see the overall governing results for each member by checking results displayed on the Wire-frame Model on the left.