SERA/ARCO TA project - Tests completed

Node Image

ARCO project: Effect of Axial Restraint on the Seismic Behaviour of Shear-Dominated Coupling Beams

This research project intended to study the effect of axial restraint on the seismic behavior of short coupling beams. That effect is generated by the interaction between the coupling beam and adjacent shear walls. Due to the large stiffness of the walls, compression force develops in the beam under loading, which limits the opening of the cracks. As a consequence, the shear behavior of the coupling beam is modified and for that reason that type of beams are characterized by a shear-dominated response, being susceptible to brittle shear failures.
To address the research goal, four coupling beams featuring conventional orthogonal ties - which does not meet the current design requirements - were tested to failure. At first, three nominally identical specimens RB1, RB2 and RB3 were loaded monotonically to failure, in a displacement-controlled manner. The only variable in this series was the level of axial restraint. Furthermore, a fourth beam (RB4) was tested under a large inelastic pulse in one direction followed by a push to failure in the opposite direction. This unconventional cyclic loading scenario can be associated with a near-fault pulse-type ground motion.

Research team: B. Mihaylov, A. Trandafir, J. Almeida, M. Ferreira, L. Hagsten, J. Fisker, S. Bousias, X. Palios, N. Stathas, E. Strepelias

Funding source:
European Union’s Horizon 2020 research and innovation programme, SERA Project