Evaluation and Modification of Open Web Steel Joists (Part II)

This is part two of a two-part series to discuss and demonstrate the methods to modify existing open web steel joists for revised loading conditions. This webinar parallels the Steel Joist Institute publication, Technical Digest No. 12 “Evaluation and Modification of Open Web Steel Joists and Joist Girders”.

View Part I

Learning Objectives of Webinar

  • Gives several methods and practices to modify existing joists to increase the load carrying capacity.
  • Provides details which are commonly used to increase the load carrying capacity of a joist component.
  • Addresses the realistic limits of modifications, with alternatives when modifications are not possible.
  • Shows examples where the joist lengths are altered.

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Take the Quiz


When considering using a replacement or new joist in an existing building, which of the following should be considered?


Which of the following is not true?


Design Approach 1 in the webinar assumes:


Design Approach 2 in the webinar assumes?


Shortening a joist will not cause a stress reversal in any of the webs?


When considering camber of a joist, joist the following is true:


A joist modification that affects the strength of a steel joist cannot be made without the approval of the following:


When lengthening a joist, if a joist has a top chord extension the following is true:


When considering shop welds on joist the follow is true:


There is only one acceptable way to reinforce a joist top chord:

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