Seismic Behavior of Coupled Wall Systems

Abstract

Structural walls connected by short coupling beams were investigated experimentally and analytically. Two one‐third scale coupled wall systems were tested with in‐plane reversing loads. The systems represented a lightly coupled wall with relatively weak beams and a heavily coupled wall with strong repaired beams. Under repeated inelastic load cycles, the lightly coupled wall system suffered severe damage in the coupling beams prior to yielding of the wall elements. The system subsequently behaved as two isolated walls in parallel. The heavily coupled wall system responded as a single structural element. High axial loads were induced in the walls from the accumulation of shear forces in the coupling beams. As a result, behavior and ductility of individual walls were significantly different from the lightly coupled system. An analytical model was developed to simulate experimental results. Parameters affecting behavior of wall systems were investigated. Comparisons were made between analytical results and experimental data. Redistribution of shear and moment through coupling beams was determined.