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Mitigating the seismic pounding of multi-story buildings in series using linear and nonlinear fluid viscous dampers

Elwardany Hytham, Jankowski Robert, Seleemah Ayman

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 4

1--16

Seismic-induced pounding between adjacent buildings may have serious consequences, ranging from minor damage up to total collapse. Therefore, researchers try to mitigate the pounding problem using different methods, such as coupling the adjacent buildings with stiff beams, connecting them using viscoelastic links, and installing damping devices in each building individually. In the current paper, the effect of using linear and nonlinear fluid viscous dampers to mitigate the mutual pounding between a series of structures is investigated. Nonlinear finite-element analysis of a series of adjacent steel buildings equipped with damping devices was conducted. Contact surfaces with both contactor and target were used to model the mutual pounding. The results indicate that the use of linear or nonlinear dampers leads to the significant reduction in the response of adjacent buildings in series. Moreover, the substantial improvement of the performance of buildings has been observed for almost all stories. From the design point of view, it is concluded that dampers implemented in adjacent buildings should be designed to resist maximum force of 6.20 or 1.90 times the design independent force in the case of using linear or nonlinear fluid viscous dampers, respectively. Also, designers should pay attention to the design of the structural elements surrounding dampers, because considerable forces due to pounding may occur in the dampers at the maximum displaced position of the structure.

Adhesion control in the system of "wheel-rail"

Gorbunov N., Kovtanets M., Prosvirova O., Garkushin E.

Transport Problems

2012

T. 7, z. 3

15-24

The paper reviewed the proposed promising method for jet-abrasive treatment of contact surfaces of wheel and rail. The mathematical model of metal removal and the depth of penetration of abrasive particles, which are used in the method for determining surface roughness profile formed by jet-abrasive processing. Concluded that the choice of parameters and treatment regimes for optimal profile of the surface roughness.