An experimental study was carried out to develop a better understanding of the response of frame-wall structures to strong earthquake motions. Each small-scale structure (total height of 2. 29 meters) consisted of two three-bay frames and one wall resisting lateral loads in parallel. Measurements at each of the ten levels included accelerations, displacements and forces resisted by the interior wall. Experimental parameters of the four-structure series were the simulated earthquake motion and the strength of structure. Measured response of the test structures was examined in terms of apparent modal properties to evaluate the correctness of using a linear modal analysis with arbitrarily softened member stiffnesses to estimate response of the nonlinearly behaving structures. Internal-force measurements were also examined to investigate frame-wall interaction in the nonlinear range of response and to check the reliability of the proposed design method for proportioning individual elements.