A Performance-Based Design Approach for Coupled Core Wall Systems with Diagonally Reinforced Concrete Coupling Beams

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A Performance-Based Design Approach for Coupled
Core Wall Systems with Diagonally Reinforced
Concrete Coupling Beams
Gang Xuan1, Bahram M. Shahrooz2,*, Kent A. Harries3 and Gian A. Rassati2
1Christie Engineering LLC, Bedminster, New Jersey, USA
2University of Cincinnati, Ohio, USA
3University of Pittsburgh, Pennsylvania, USA
(Received: 16 October 2007; Received revised form: 18 March 2008; Accepted: 20 March 2008)
Abstract: Coupled core wall systems (CCWs) are lateral force resisting systems that
can provide remarkable lateral stiffness for mid- to high-rise buildings, exceeding the
lateral stiffness of isolated walls while providing the redundancy and force
redistribution capabilities of framed systems. The lateral stiffness provided by CCWs
largely depends on the type of coupling beams used to transfer forces between wall
piers. Diagonally-reinforced concrete coupling beams are one of the more common
details although composite alternatives (e.g., those using structural steel W-shapes,
hollow structural steel sections, or embedded steel plates) or beams with rhombic
reinforcement are increasingly being selected as viable alternatives. Despite the
favorable behavior exhibited by diagonally-reinforced coupling beams in experimental
studies, designing and constructing diagonally-reinforced coupling beams having
practical span-to-depth ratios presents significant difficulties, impacting the use of
CCWs as a viable lateral force resisting system. This paper presents a performancebased
design (PBD) approach that allows the designer to successfully proportion a
code-compliant CCW system that addresses the shortcomings related to the traditional
strength-based design approach. A prototype building is designed following both
approaches, and is analyzed both statically and dynamically. Results show that the
PBD approach produces a code-compliant structure that satisfies the most pressing
constructability constraints.

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