This study will use the FHWA Guide to load rate the connection capacity using advanced finite element analysis and attempt to develop prioritization techniques to identify critical checks that could be used to identify critical gusset connections. Furthermore, this study will specifically determine the proper values for unbraced length and buckling coefficient for plates in compression, as well as the necessary plate stiffness requirements to allow the development of the plastic resistance in shear. The new approach should enable bridge engineers to evaluate the capacity of gusset plates with near critical demand-to-capacity ratios to be identified for further, more refined, analysis and/or retrofit.

Detailed finite element models of selected WSDOT gusset plates have been developed and more are continuing to be developed. Key parameters that impact the stress state of the gussets have been identified. Currently, a study is being conducted to determine the impact of those parameters. A preliminary methodology for simplified gusset evaluation has been conceived and the results of the parametric analysis will be used assess the method's adequacy over the coming months.

Task 1 is continuing as additional WSDOT gusset plates of interest are identified.
Task 2 is continuing. A modeling methodology has been developed and is being applied to the selected gusset plates.
Task 3 is continuing. As new gussets are selected the FHWA procedure is being applies.
Task 4 is continuing. As new gussets are identified, a range of parameters is studies for each.
Task 5 is continuing. A preliminary simplified methodology has been conceived and is now being evaluated against the various finite model results.
Task 6 (examples) is not yet underway.
Task 7 (reporting) is not yet underway.

No new activity is proposed.

No problems have been identified.

No implementation of results has occurred yet.