[Zurück]

A. Pirrotta, R. Heuer, C. Adam:
"Passive Control of Earthquake Excited Shear Buildings. Experimental and Computational Studies";
1997.

Experimental and numerical investigations of 2DOF-response control are presented. A small-scaled plane two-storey model frame with a vibration absorber attached to the second floor, is considered for the case of random support excitation. Both elastic and elasto-plastic response are measured using different material properties of the second floor at various excitation levels. A parametric study is performed by varying the absorber’s fundamental frequency and damping, and the optimum structural parameters theoretically obtained are compared to those found by experiments. The experimental set-up, the determination of the system parameters and of the corresponding statistical values of the response functions are described. For the numerical simulations an iterative synthesis technique is chosen, which is based on a modal decomposition. Thereby, the inelastic relative displacements are considered as additional internal loads of the corresponding linear elastic background structure. Measured time histories of the base acceleration are used as the support excitation in the computational studies. Both experimental and numerical results show high efficiency of the absorber in the elastic case. However, for the elasto-plastic structure, the absorber decreases the vibrations of the main frame very slightly, or even can amplify the structural response.