Earthquakes and Structures

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The effect of rubber bumper in order to suggest a new equation to calculate damping ratio, subjected building pounding during seismic excitation

  • Khatami, S.M. (University of Applied Science and Technology, Center of Semnan Municipality) ;
  • Naderpour, H. (Faculty of Engineering, Semnan University) ;
  • Mortezaei, A.R. (Seismic Geotechnical and High Performance Concrete Research Centre, Civil Engineering Department, Semnan Branch, Islamic Azad University) ;
  • Barros, R.C. (Faculty of Civil Engineering, University of Porto (FEUP)) ;
  • Maddah, M. (University of Applied Science and Technology, Center of Semnan Municipality)
  • Received : 2021.12.19
  • Accepted : 2022.08.03
  • Published : 2022.08.25
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Abstract

One of the objectives to prevent building pounding between two adjacentstructures is to considerseparation distance or decrease relative displacement during seismic excitation. Although the majority of building codes around the world have basically suggested some equations or approximately recommended various distances between structuresto avoid pounding hazard, but a lot of reportsin zone of pounding have obviously shown thatsafety situation or economic consideration are not always provided due to the collisions between buildings and the cost of land, respectively. For this purpose, a dynamic MDOF model by having base isolation system is numerically considered and using various earthquake records, relative displacements are mathematically investigated. Different equations to determine the value of damping ratio are collected and the results of evaluations are listed for comparison among them to present a new equation for determination of impact damping ratio. Presented equation is depends significantly on impact velocity before and after impact based on artificial neural network, which the accuracy of them is investigated and also confirmed. In order to select the optimum equation, hysteresisloop of impact between base of building and rubber bumper is considered and compared with the hysteresis loop of each impact, calculated by different equations. Finally, using representative equation, the effect of thickness, number and stiffness of rubber bumpers are numerically investigated. The results of analysis indicate that stiffness and number of bumpers have significantly affected in zone of impact force while the thickness of bumpers have not shown significant influence to calculate impact force during earthquake. For instance, increasing the number of bumpers, gap size between structures and also the value of stiffness is caused to decrease impact force between models. The final evaluation demonstrates that bumpers are able to decrease peak lateral displacement of top story during impact.

Keywords

References

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