Modelling rocking response via equivalent viscous damping     

Umberto Tomassetti  Francesco Graziotti  Luigi Sorrentino  Andrea Penna 《地震工程与结构动力学》2019,48(11):1277-1296

The assessment of the out-of-plane response of masonry structures has been largely investigated in literature assuming that walls respond as rigid or semi-rigid bodies, and relevant equations of motion of single-degree-of-freedom and multi-degree of freedom systems have been proposed. Therein, energy dissipation has been usually modelled resorting to the classical hypotheses of impulsive dynamics, delivering a velocity-reduction coefficient of restitution applied at impact. In fewer works, a velocity-proportional damping force has been introduced, by means of a viscous coefficient being constant or variable. A review of such models is presented, a criterion for equivalence of dissipated energy is proposed, equations predicting equivalent viscous damping ratios are derived and compared with experimental responses. Finally, predictive equations are examined in terms of incremental dynamic analyses for large sets of natural ground motions.  相似文献   

Contribution to knowledge regarding the sources of earthquakes on the island of Ischia (Southern Italy)     

Cubellis  Elena  Luongo  Giuseppe  Obrizzo  Francesco  Sepe  Vincenzo  Tammaro  Umberto 《Natural Hazards》2020,100(3):955-994

Natural Hazards - This paper analyses data regarding the seismicity and ground deformations of the island of Ischia. The goal is to describe these phenomena as a space–time process, exploring...  相似文献