Effect of axial restraint and loading history on the behavior of short reinforced concrete coupling beams

[en] Short reinforced concrete (RC) coupling beams are key for the adequate behavior of coupled-wall structures, while at the same time they are susceptible to brittle shear failures. Particularly vulnerable are existing pre-1970s coupling beams in seismic zones that feature orthogonal reinforcement with low amounts of stirrups. However, while the shear behavior of such members is influenced by the axial restraint provided by the stiff shear walls, lab tests have neglected this effect. In addition, lab tests typically feature a symmetrical cyclic loading history, while in reality large inelastic pulses in one direction may affect the behavior of the beam in the opposite loading direction. Therefore, this paper presents an experimental program consisting of four large-scale coupling beams with variable level of axial restraint and different types of loading. Load-displacement curves, crack diagrams, deformed shapes, steel strain measurements, photographs, and an advanced strut-and-tie model are used to establish a comprehensive picture of the behavior of the beams. It is shown that the axial restraint generates large compression in the beams and significantly alters their crack pattern and shear strength. Large inelastic pulses have a limited effect on the strength, but significantly influence the drift capacity of coupling beams.

Disciplines :

Civil engineering

Author, co-author :

Mihaylov, Boyan ; Université de Liège - ULiège > Département ArGEnCo > Structures en béton

Trandafir, Alexandru

Palios, Xenofontas

Strepelias, Elias

Bousias, Stathis

Language :

English

Title :

Effect of axial restraint and loading history on the behavior of short reinforced concrete coupling beams

Publication date :

01 July 2021

Journal title :

ACI Structural Journal

ISSN :

0889-3241

Publisher :

American Concrete Institute, Liege, United States

Volume :

118

Issue :

Pages :

71-82

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 20 November 2020

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