CE 5310 Lecture Notes - Lecture 6: Strength Reduction
Document Summary
Use w14x109 as the beam section and w21x93 as the column section. The factored gravity load on the roof will be approximately 2,400 kips (see figure 1). The corresponding deformation parameters for beam are: plastic rotation (du) = 0. 03 rad. , (dl) = 0. 04 rad. ; residual plastic rotation (dr) = 0. 1 rad. ; maximum plastic rotation (dx) = 0. 15 rad. Therefore, it is on the safe side for modeling purposes to use the moment capacity-plastic rotation relation shown in figure 3(b) for columns, in which: plastic rotation (dl) = 0. 03 rad. , residual plastic rotation (dr) = 0. 1 rad. ; maximum plastic rotation (dx) = 0. 15 rad. (c) axial compression-moment capacity interaction and p effect in columns are accounted for by modeling the properties of w21x93 column using column moment hinge (not beam moment hinge ) in perform-2d. Assume that the ultimate moment capacity equals mp and ultimate axial force capacity equals fcrag.
