SUMMARYPast severe earthquakes indicate that structural pounding may cause considerable damage or even lead to collapse of colliding structures if the separation distance between them is not su cient. Because of its complexity, modelling of impact is an extremely di cult task, however, the precise numerical model of pounding is essential if an accurate structural response is to be simulated. The aim of this paper is to analyse a non-linear viscoelastic model of collisions which allows more precise simulation of the structural pounding during earthquakes. The e ectiveness of the model is veriÿed by comparing the results of numerical analyses with the results of experiments conducted on pounding between di erent types of structures. The results of the study indicate that, compared to other models, the proposed non-linear viscoelastic model is the most precise one in simulating the pounding-involved structural response.
SUMMARYPast severe earthquakes indicate that pounding may cause considerable damage or even lead to collapse of colliding structures. The aim of this paper is to present an analysis of pounding between superstructure segments of an isolated elevated bridge induced by the propagating seismic wave. High-damping rubber bearings (HDRBs), used as isolation devices, are modelled by proposed non-linear formulation and the significance of the bearings model for pounding is indicated. The results of the study show that pounding leads to the increase or decrease of the forces acting on piers, depending on the gap size between superstructure segments.1998 John Wiley & Sons, Ltd.
SUMMARYEarthquake-induced structural pounding has been recently intensively studied with the help of di erent models of impact force. It has been veriÿed through comparisons, that the non-linear viscoelastic model may be considered somewhat the most accurate one among them. The aim of this short paper is to derive an approximating formula relating the impact damping ratio, as a parameter of the model mentioned, with a more widely used coe cient of restitution. The accuracy of the derived analytical formulation has been conÿrmed through the comparison with the results of numerical simulations.
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