Open-web joists are a common choice for supporting floors and roofs because they are lightweight and relatively easy to install. Dead load will tend to push down on the joists, and wind will typically...

Open-web joists are a common choice for supporting floors and roofs because they are lightweight and relatively easy to install. Dead load will tend to push down on the joists, and wind will typically cause uplift. To learn more about the behavior, we want to find the sense of the axial force in members FG, PF, PG, and PQ due to each type of load separately.