Optimization

The Hidden Costs of Optimization, Part II

  • Understanding how the computer software automatically loads a truss can help designers avoid unintended consequences when optimizing trusses.
  • When fascia loads are missing from a project, there is incorrect loading on the jack trusses, sub girders and the corner girder/hip jack.
  • Missing loads can lead to extensive repairs and may even require that the trusses be revised. 

Applying BCMC

BCMC session evaluations indicated that the BCMC Committee hit a home run in choosing the topics they did. Take a few moments to catch up on what you might have missed at this year's show.

The Hidden Costs of Optimization, Part I

  • When analyzing a girder truss, the Truss Designer needs to keep in mind the assumptions the truss analysis program makes regarding reaction capacities.
  • It is the Building Designer’s responsibility to verify the capacity of the bearing surface, but the Truss Designer must ensure that the truss-to-bearing connection has a chance of being made without crushing.
  • The article provides a series of concepts to use if a truss needs to be designed without knowing the bearing surface type and its feasibility of providing adequate support for the trusses.

Optimization

  • Examine each operational area for changes that could help improve overall economics.
  • Make sure the design department is up to date on price changes of stock lengths of lumber, especially changes due to design value adjustments.
  • Factor customer needs into optimization, along with producing a more efficient truss using less material and plant labor.

Single Top Plate in a Wood Stud Wall

  • The exception to IRC Section R602.3.2 allows for the use of a single top plate in a wood stud wall if the design meets specific requirements.
  • By cutting the volume of lumber in the top plate in half, a single top plate allows more space for insulation and can reduce thermal bridging through the lumber, which increases the thermal efficiency of the wall system.
  • When trusses are centered over the studs with a tolerance of not more than 1", the stud spacing can be increased to 24" o.c., which removes more lumber, improves energy efficiency and still provides a continuous load path.
  • To determine if the use of a single top plate is beneficial, a number of factors must be weighed. 

Uncovering the Value Proposition of Component Design

  • The fact that ten truss technicians may come up with ten completely different designs for the same project is evidence that components are not commodities.
  • It is very important to confirm that the applied loads are the loads that the EOR or building owner has specified.
  • Using unique ways to share design best practices is a great way to develop skills and build strong teams.