Beam Hoop Reinforcement for Large Beams in Special Moment Resisting Frames

Research purpose

The tall building design community is in need of resolving the requirements for beam hoop reinforcement necessary to achieve adequate performance in large beams in special moment resisting frames in seismic environments. The issue is especially critical in high-rise buildings for which seismic resistance is concentrated in a few frames, resulting in very large beams. Laboratory testing is needed to resolve this significant matter for the concrete industry. Three beams, 4 feet deep by 2.5 ft wide by 14 ft long, will be tested statically under cyclic load reversals. The results of this research study will be considered for adoption as an ACI 318 Building Code provision that will ensure improved seismic performance of certain reinforced concrete moment frame buildings.

University of California Berkeley
Project Area
Structural Engineering
CPF research grant #
Award amount
Grant period
Sep 2010 - Jul 2011
Grant Status
Principal Investigator
Professor Jack Moehle
Industry champions

ACI Committee 374

CPF allies

Effect of Hoop Reinforcement Spacing on the Cyclic Response of Large Reinforced Concrete Special Moment Frame Beams
Marios Panagiotou
Tea Visnjic
Grigorios Antonellis
Panagiotis Galanis
Jack P. Moehle