Update to CSA 086-14

Important Note – These are descriptions to changes implemented in WoodWorks Connections for version 9.3 and may not reflect current program behaviour.

The program now implements the new CSA O86-14 Engineering Design in Wood Standard. As the National Building Code referencing CSA O86-14 is not yet released, and provincial building codes have not yet mandated the use of O86-14, the program also allows you to continue using CSA O86-09.

1. Choice of CSA Editions
   1. Input

      A drop list box called Design Code has been added to the Settings menu, with the choices

      CSA O86-09/ NBC 2010

      CSA O86-14/ NBC 2010

   2. Output

      The heading in the design results output that previously said Design Results now adds …using CSA O86-09 or …using CSA O86-14, as the case may be.

   3. Program Information

      In the About Connections box accessed from the Help menu and in the Building Codes box accessed from Welcome box shows the edition of the O86 currently being used, and the fact that it is the May 2014 printing of the CSA O86-14. In the main body of the Welcome box, it indicates that either of these codes can be used.

2. Design Code Clause References
   1. Update to 2014

      The references to the CSA 086 design code clause numbers in the input forms and screen messages, and in warnings, design notes and other program output, have been updated to show the 2014 edition clause numbers when CSA O86-14/ NBC 2010 is chosen as the Design Code setting. It continues to show 2009 edition numbers when CSA O86-09/ NBC 2010 is chosen.

   2. Consistent Formatting

      The notes and messages were changed to consistently not include "CSA", always include "O86", and not include the edition year ("-09" or "-14"). The details about the design code being used are shown prominently elsewhere in the input and are not needed with every note and message.

      In the course of this work minor syntactical corrections were made to a few notes and messages.

   3. On-line Help

      The on-line Help in the new Web Help format has been updated to refer to the CSA O86-14 design code clauses. The older Help format is also included in the installation to allow you to use Help that references O86-09.

3. On-line Design Code

   The on-line 2014 edition of CSA O86 in .pdf form is now included in the Design Office installation. Refer to the Design Office Read me file for details.

Unless otherwise indicated, the remainder of the changes described in this topic occur when CSA O86-14 is selected as the design code edition in the Settings menu.

1. Fabrication Moisture Content
   1. Nomenclature

      In CSA O86-14 Table 12.2.1.5 for service condition K_SF, the terminology for fabrication conditions Seasoned and Unseasoned has been changed to Dry and Green, respectively. In Connections, this change has been implemented in the Fabrication Moisture Content input and in the Connection Data output. The output now includes the words service and fab., after the words wet, dry, or green, to qualify whether dry is being used for in-service or for fabrication conditions.

   2. Definition

      Please note that the threshold for which a member is considered to be wet or unseasoned has changed from 15% moisture content to 19%, so that projects with moisture contents between 15% and 19% are now considered dry rather than unseasoned, and have different service factors K_SF as a result. You will need to adjust older project files accordingly.

2. Service Condition Factors for Row Shear and Group Tear-out Calculations

   For bolted connections, the calculations for Row Shear Resistance from O86-14 12.4.4.4 and Group Tear-out Resistance from 12.4.4.5 now use the service condition factor K_sv for shear design, and in the case of group tear-out, the factor K_ST for tension design, instead of the factor K_SF for connection design. The K_ST and K_sv factors are from Tables 6.4.2 for sawn lumber and 7.4.2 for glulam, whereas the K_SF factor is from O86-09 10.2.1.5 (now 12.2.1.5).

   As a consequence, the service factor for these checks now depends on the type of material being used, and can be different for the main member and side member.

   The K_SV factor is now shown in the output table if it is used for row shear or group tear-out calculations. For both O86-09 and O86-14, K_SV is also shown if used for the effective depth check, which has always involved K_SV but the factor hadn’t been displayed in the output.

   The K_ST factor which was previously shown for the net tension check is now also shown when there is a group tear-out check.

3. Lag Screw Withdrawal Resistance

   The calculation of y_w, the withdrawal resistance per millimetre of lag screw penetration into main member, is now based on an equation in CSA O86-14 12.6.5.1 based on nominal lag screw diameter, d_F, and mean relative density G of the main member. Previously y_w, was based on Table 10.6.5.1 from CSA O86-09, which listed values based on diameter and species group.

4. Small Diameter Lag Screw Yield Strength

   The steel yield strengths f_y of ¼" and 5/16" diameter lag screws have been changed from 483 MPa and 414 MPa, respectively, to 310 MPa, the same strength as all other lag screw diameters, to comply with CSA O86-14 12.6.6.1.2. This yield strength is shown in the Fastener section of the design output report.

5. Lag Screw Steel Grade

   The steel grade SAE J429 Grade 1 is now shown in the Fastener section of the design output report, as this is now specified in CSA O86-14 12.6.6.1.2.