An Investigation on the Seismic Behavior of Deep Reinforced Concrete Coupling Beams

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Title: An Investigation on the Seismic Behavior of Deep Reinforced Concrete Coupling Beams

Author(s): Erwin Lim, Shyh-Jiann Hwang, Ting-Wei Wang, and Yu-Hsuan Chang

Publication: Structural Journal

Volume: 113

Issue: 2

Appears on pages(s): 1-10

Keywords: design procedure; diagonally reinforced deep coupling beam; seismic behavior; shear strength

Date: 3/1/2016

Abstract:
The ACI 318-14 design procedure for a diagonally reinforced coupling beam is questioned because it proportions the amount of diagonal reinforcement to meet shear demands by completely neglecting the participation of concrete and failing to recognize any flexural strength that may be developed. This ACI 318-14 design procedure might introduce unnecessary additional forces to the entire coupled wall system. This study proposes that the amount of diagonal reinforcement should be determined using beam flexural theory to satisfy the design moment at the Design Based Earthquake level. Test results of diagonally reinforced deep coupling beam specimens showed that they can preserve ductile flexural behavior up to the Maximum Considered Earthquake level, and part of the shear strength was contributed from concrete in addition to diagonal bars. Finally, a strut-and-tie model to illustrate the involved mechanism is also proposed.