Title:
Outrigger Action in Tall Core-Wall Buildings with Flat-Plate Framing
Author(s):
Connie I. Chen and Jack P. Moehle
Publication:
Structural Journal
Volume:
121
Issue:
2
Appears on pages(s):
143-151
Keywords:
earthquake engineering; flat plate; gravity framing; nonlinear modeling; outrigger action; plastic hinge; post-tensioned slab; slab-column joint; slab-wall connection
DOI:
10.14359/51740250
Date:
3/1/2024
Abstract:
In tall core-wall buildings with concrete unbonded post-tensioned
flat-plate gravity framing, modeling the behavior of the slab-wallcolumn framing under earthquake loading can be crucial to determining structural response quantities for the design of the flat-plate framing. The outrigger action of the gravity system also affects the overall dynamic properties of the building and may affect wall
moment and shear demands. The outrigger effect can be modeled
using a slab-beam model, which uses linear-elastic frame elements
with concentrated nonlinear hinges at each end. In this study, the
slab-beam model is calibrated using results from a slab-wallcolumn
laboratory test. Recommendations suitable for design office
practice are presented.