• The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal


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

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.