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Diseño de miembro de SkyCiv

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  4. AS 1720 Diseño de Miembro

AS 1720 Diseño de Miembro

Member Design for Timber Structures according to AS 1720 – 2010

General Information

Before you begin

Before you begin the design module, deberá realizar los siguientes pasos adicionales.

  1. Importar combinaciones de carga de código de diseño.
  2. Asigne casos de carga de código de diseño a los grupos de carga en su modelo.

Design Specific Information

Compatibilidad con la versión actual


  • Rectangular
  • Circular

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


  • Sawn timber, sazonado y sin sazonar
  • GluLam
  • Pole timber
  • LVL (próximo)

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



Sobre el Detalles tab you can enter your project details so that they are displayed on your report, however they are not required.



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

El Miembros tab contains several tables:

  1. El Miembros de diseño mesa: vea abajo.
  2. El Materiales Mesa: for your reference to review the materials used in your design.
  3. El compuestas Mesa: también para referencia.

El Miembros de diseño 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.

Sobre el Miembros tab you can edit:

  1. El Identificación de miembro(s) campo: you can add multiple members to a single design member to simplify your design. Enter the member ids separated by commas.
  2. El DefL campo: deflexion en una viga, deflexion en una viga.
  3. El ID de parámetro campo: the ID that links your design member to the Parámetro table in the Parámetros lengüeta, deflexion en una viga.

NOTA: Entering items like members or nodes as a comma separated list is a useful feature used widely in SkyCiv. Por ejemplo: when modelling you can apply the same loads to multiple members by entering a comma separated list of the member ids in the Identificación de miembro campo.



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 Miembros de diseño mesa. 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.

El ID de parámetro is entered in the Miembros de diseño table under the Miembros lengüeta, véase arriba en.

NOTA: The bulk of parameters have been hidden – para acceder a ellos, haga clic en el edit icon under More Parameters Bóveda.

Sobre el Parámetros tab you can edit:

  1. El k4 campo: factor de condimento parcial.
  2. El k6 desplegable: factor de temperatura.
  3. El Fi desplegable: factor de capacidad.
  4. El gramo13 desplegable: factor de longitud efectivo.
  5. El Description campo: for your reference, does not appear in report.


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

  1. El Intermediate Restraints lengüeta: for bending and compression buckling.
  2. El Polo lengüeta: para tramos circulares.
  3. El Strength Sharing lengüeta: for bending checks on rectangular sections.
  4. El Tensión lengüeta: for bolted members.

Intermediate Restraints Parameters

If you would like to apply these parameters, please set the Aplicar toggle to on.

Sobre el Intermediate Restraints tab you can edit:

  1. El Major Axis desplegable: tipo de sujeción contra pandeo del eje mayor.
  2. El Lax campo: distancia entre restricciones discretas.
  3. El Minor Axis desplegable: type of restraint against minor axis buckling and lateral-torsional buckling.
  4. El Minor Axis Position drop-down position of the restraint on the section, Positivo si la restricción está en el borde superior de una viga normalmente orientada.
  5. El Lay campo: la distancia entre restricciones discretas, if the Minor Axis field is set to Discrete this is required.
  6. El Fly Braces desplegable: restricción parcial contra pandeo lateral-torsional.
  7. El La-φ campo: La distancia entre las llaves de mosca.


Pole Parameters

If you would like to apply these parameters, please set the Aplicar toggle to on.

En esta pestaña puede editar:

  1. El Species Class campo: for k20 and k21, la norma proporciona un método para calcular los valores para eucaliptos y corymbias, y madera blanda. Other hardwoods must be estimated.
  2. El j9 campo: immaturity rigidity factor.
  3. El k20 campo: immaturity strength factor.
  4. El k21 desplegable: shaving factor.
  5. El k21b, k21cl, k21cp,v, y k21t fields: shaving factors for various strength properties.
  6. El k22 desplegable: processing type.

Strength Sharing Parameters

If you would like to apply these parameters, please set the Aplicar toggle to on.

Sobre el Strength Sharing tab you can edit:

  1. El Parallel System campo: choose a combination of discrete and combined.
  2. El nortecon desplegable: number of elements combined into a discrete unit.
  3. El nortemem desplegable: number of discrete units the the system.
  4. El Espaciado campo: centre-to-centre spacing of discrete units.
  5. El Span Length campo: effective span of the parallel members.


Tension Parameters

If you would like to apply these parameters, please set the Aplicar toggle to on.

Sobre el Tensión tab you can edit:

  1. El Number of bolts campo: number of bolts at the critical cross-section.
  2. El Bolt diameter campo: diámetro de los tornillos.
  3. El Bolt hole tolerance field: tolerancia.

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



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.

El Cargas tab contains:

  1. El Fuerza lengüeta: for strength load combinations.
  2. El Serviceability lengüeta: for serviceability load combinations.
  3. El Unallocated lengüeta: user defined load combinations can be moved to either Fuerza o Serviceability pestañas.


NOTA: To allocate your custom load combinations, simple click the button for the load combination type you’d like to move it to. Después, review the load combination factors in the appropriate tab.


Sobre el Fuerza tab you can edit:

  1. El Nombre desplegable: select the name of the load combination to be displayed.
  2. El Description campo: for reference, does not appear in report.
  3. El Duration Units desplegable: segundos, minutos, horas, dias, months or decades, these correspond with the k1 factor table.
  4. El Nominal Load Modification Factor desplegable: ninguno, short-term, a largo plazo, terremoto, combination or custom.
  5. El Nominal Load Modification Factors fields for each load group: to edit select the ‘custom’ desde el Nominal Load Modification Factor drop-down custom type, otherwise these will be automatically filled with AS 1170 valores.



Sobre el Serviceability tab you can edit:

  1. El Nombre desplegable: select the name of the load combination to be displayed.
  2. El Description: not required, does not appear in report.
  3. El Nominal Load Modification Factor drop down: ninguno, short-term, a largo plazo, terremoto, combination or custom.
  4. The fields in the Greater than 1 Year, 5 Months, 5 Days and Less then 1 Día columnas: these factors are proportions of the load case that is equal to the each respective load duration.

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



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

En el Resultados tab you have an overview of the utility ratios of the important checks in the design code in the Member Design Ratios mesa, 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 Reporte column of the Member Design Ratios mesa.


Finalmente, you can see the overall governing results for each member by checking results displayed on the Wire-frame Model a la izquierda.


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