您的SkyCiv软件指南 - 教程, 使用指南和技术文章


  1. SkyCiv会员设计
  2. 成员设计模块
  3. 如 1720 会员设计

如 1720 会员设计

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



  • 长方形

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


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

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



细节 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.

会员 tab contains several tables:

  1. 设计成员 SkyCiv 的 3D 建模和分析工具: 见下文.
  2. 用料 桌子: for your reference to review the materials used in your design.
  3. 栏目 桌子: also for reference.

设计成员 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.

会员 tab you can edit:

  1. 会员ID(s) 领域: you can add multiple members to a single design member to simplify your design. Enter the member ids separated by commas.
  2. 国防部大号 领域: choose an appropriate deflection limit, this is required for calculating the deflection utility ratio.
  3. 参数标识 领域: the ID that links your design member to the 参数 table in the 参数 标签, read below for more information about setting parameters.

注意: Entering items like members or nodes as a comma separated list is a useful feature used widely in SkyCiv. 例如: when modelling you can apply the same loads to multiple members by entering a comma separated list of the member ids in the 会员ID 领域.



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 设计成员 SkyCiv 的 3D 建模和分析工具. 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.

参数标识 is entered in the 设计成员 table under the 会员 标签, 看上面.

注意: The bulk of parameters have been hiddento access them, 点击 edit icon under More Parameters 标题.

参数 tab you can edit:

  1. ķ4 领域: partial seasoning factor.
  2. ķ6 drop-down: temperature factor.
  3. drop-down: capacity factor.
  4. G13 drop-down: 有效长度因子.
  5. Description 领域: for your reference, does not appear in report.


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

  1. Intermediate Restraints 标签: for bending and compression buckling.
  2. 标签: 对于圆形截面.
  3. Strength Sharing 标签: for bending checks on rectangular sections.
  4. 张力 标签: for bolted members.

Intermediate Restraints Parameters

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

Intermediate Restraints tab you can edit:

  1. 长轴 drop-down: type of restraint against major axis buckling.
  2. 大号ax 领域: distance between discrete restraints.
  3. 短轴 drop-down: type of restraint against minor axis buckling and lateral-torsional buckling.
  4. 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. 大号ay 领域: the distance between discrete restraints, if the Minor Axis field is set to Discrete this is required.
  6. Fly Braces drop-down: partial restraint against lateral-torsional buckling.
  7. 大号a-φ 领域: The distance between fly braces.


Pole Parameters

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

On this tab you can edit:

  1. Species Class 领域: 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. Ĵ9 领域: immaturity rigidity factor.
  3. ķ20 领域: immaturity strength factor.
  4. ķ21 drop-down: shaving factor.
  5. ķ21b, ķ21cl, ķ21cp,v, 和 ķ21Ť fields: shaving factors for various strength properties.
  6. ķ22 drop-down: processing type.

Strength Sharing Parameters

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

Strength Sharing tab you can edit:

  1. Parallel System 领域: choose a combination of discrete and combined.
  2. ñ drop-down: number of elements combined into a discrete unit.
  3. ñmem drop-down: number of discrete units the the system.
  4. 间距 领域: centre-to-centre spacing of discrete units.
  5. 跨度 领域: effective span of the parallel members.


Tension Parameters

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

张力 tab you can edit:

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

注意: The calculation of Añ 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. 这使得设计木结构荷载变得更加复杂, 每个负载组合都需要考虑负载的持续时间.

To account for this effect AS 1720 为强度负荷持续时间提供一个系数 (ķ1) 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.

负荷 tab contains:

  1. 强度 标签: for strength load combinations.
  2. 适用性 标签: for serviceability load combinations.
  3. Unallocated 标签: user defined load combinations can be moved to either 强度 要么 适用性 标签.


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


强度 tab you can edit:

  1. 名称 drop-down: select the name of the load combination to be displayed.
  2. Description 领域: for reference, does not appear in report.
  3. Duration Units drop-down: 秒, 分钟, 小时, 天, months or decades, these correspond with the k1 factor table.
  4. Nominal Load Modification Factor drop-down: 没有任何, short-term, 长期, 地震, combination or custom.
  5. Nominal Load Modification Factors fields for each load group: to edit select the ‘custom’ 来自 Nominal Load Modification Factor drop-down custom type, otherwise these will be automatically filled with AS 1170 价值观.



适用性 tab you can edit:

  1. 名称 drop-down: select the name of the load combination to be displayed.
  2. Description: not required, does not appear in report.
  3. Nominal Load Modification Factor drop down: 没有任何, short-term, 长期, 地震, combination or custom.
  4. The fields in the Greater than 1 Year, 5 几个月, 5 Days and Less then 1 天 列: these factors are proportions of the load case that is equal to the each respective load duration.

注意: 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 检查设计 纽扣. The software will alert you if you have missed any required fields, otherwise you will be taken to the Results tab.

在里面 结果 tab you have an overview of the utility ratios of the important checks in the design code in the Member Design Ratios SkyCiv 的 3D 建模和分析工具, if you’d like more detail you can click on the 设计概要 button for a summary report.

In this member design module, individual reports are also available by clicking on the report icon in the 报告 column of the Member Design Ratios SkyCiv 的 3D 建模和分析工具.


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


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