Technical Digest 12 Evaluation and Modification of Open Web Steel Joists and Joist Girders


SKU: TD12-2020 Categories: ,


The Steel Joist Institute’s third edition of Technical Digest 12 gives the reader information regarding the application and usage of steel joists and joist girders. Technical Digest 12 covers the evaluation of existing steel joists and joist girders to carry additional loads not accounted for in their original design. Technical Digest 12 also addresses situations where the configuration and/or the original geometry of the steel joists or joist girders need to be modified in the field.

The latest updates to Technical Digest 12 include a new section called “Reinforcing Joists Adjacent to a Wall or Other Obstruction” and a new section called “Welding Requirements for Reinforcement.” In addition, examples illustrating weld requirements at panel points and shear flow considerations have been included. Many examples have been updated to include grade 50 ksi reinforcement instead of A36.

Additionally, Example 2.3 has been updated because the labels in Figure 2.5 have been reversed, and a few figures that contained typos have been corrected.

This and other SJI technical digests serve to highlight specific areas of design and/or application for the benefit of architects, building inspectors, building officials, designers, engineers, erectors, students and others.

Chapters include:

  • Evaluation of existing joist strength
  • Methods of supporting additional load
  • Design approaches for strengthening joists
  • Design approached for modifying joists – shortening and lengthening
  • Other considerations
  • Modification instructions and summary

Download SJI’s errata to Technical Digest 12. Downloads of the full technical digest incorporate the updates from the errata. To order the full technical digest, add the download version to your cart.

Published Third Edition February 2023

Additional information

Weight 1.46875 lbs
Dimensions 14 × 10.75 × .4575 in
Publication type

Download, Hard Copy