Documentation

Getting Started

General Info

Beam

Structural 3D

Section Builder

Member Design

RC Design
General
Code Verification


Connection Design

API

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NDS National Design Specification for Wood Construction 2018 Edition

The National Design Specification for Wood Construction (ANSI/AWC NDS-2018) incorporates design provisions for both allowable stress design (ASD) and load and resistance factor design (LRFD). This specification is adopted in all model building codes in the United States.

Module NDS 2018 performs all cross-section resistance designs, stability analyses, and deformation analyses provided by the standard. In timber construction, the serviceability limit state represents an important design. The conservative limit deformation is present but can be modified, if necessary.

Module NDS 2018 is one of the add-on modules integrated into the S3D environment. Thus, the design-relevant input data is preset when you open the module. Also you can use standalone Design Software.

This documentation applies to NDS 2018 Edition in either ASD or LRFD provision. Learn more about SkyCiv's NDS module below, or at the design code page: NDS Wood Design.

Details

Once you have chosen either ASD or LRFD you will be presented with the Details tab as shown in the figure below. The units will be chosen automatically by program as imperial.

UI-Details-NDS

This is where you are able to insert project details such as:

Members

The Members tab contains all the input related to the each of the members to be designed in the module. These may contain specific parameters for each design software (hover over the tooltips for more info). These can be changed at anytime by changing the values in the cells.

Design Members

The Design Member table contains all the members, their materials, section IDs, length and their limit factors that have been automatically populated from the model. You can also delete certain members that you don't want to include in the design check.

The materials and Sections (in the lower tables) are automatically populated from the model. You can hover over the icon for more information.

UI-Members-NDS

Materials

The materials defined in S3D are preset, but you can always add the new: for that click + Add Database Material to open the material list.

According to the design concept of AWC NDS-2018 and its Supplement, the list includes only materials of the U.S. standard.

If you add the material description manually and used this material for design then you have to add this material in the S3D too.

UI-Import_Material-NDS

You can hover over the icon in the View column for more information about the material properties.

UI-Material_prop-NDS

Sections

This table shoves the cross-sections used for design. The cross-sections defined in S3D are present in this table.

The design is possible for the parametric round cross-section and for the standardized timber rectangular cross-section according to NDS-2018 Supplement.

Axis_systems_Sections-NDS

Axis systems of cross-section


You can hover over the icon in the View column for more information about the cross-section properties.

UI-section_prop-NDS

Parameters

The Parameters tab contains all the input related to the each of the members to be designed in the module. The module uses these parameters for automatic calculation of Adjustment Factors. These can be changed at anytime by changing the values in the cells.

UI-Parameters-NDS

Factors

The Parameters tab contains all the input related to the each of the members to be designed in the module. The module uses these parameters for automatic calculation of Adjustment Factors. These can be changed at anytime by changing the values in the cells.

UI-Factors-NDS

Forces

Internal member forces are automatically imported from the structural analysis, this includes load combinations. The software will display each of the forces as per the selected load combination. The software will design check based on the worst case for each member and load combination.

UI-Forces-NDS

By default, the module uses the worst case load combination, but you can choose one of them for design.

UI-Choose_lc-NDS

Results

There are three ways to review the results of your design check:

UI-Results-NDS

Below you can see the fragments from the Design Summary Report.

UI-Results_report1-NDS

UI-Results_report2-NDS

Learn more about this SkyCiv Wood Design software by visiting the specific design code page for NDS Wood Design