An Innovative Model to Determine Damping Ratio based on an Experimental Test during Collision

Document Type : Regular Paper

Authors

1 Ph.D, University of Applied Science and Technology, Center of Semnan Municipality, Semnan, Iran

2 Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran

3 Associate Professor, Islamic Azad University, Semnan Branch, Semnan, Iran

4 Ph.D Student, Islamic Azad University, Semnan Branch, Semnan, Iran

5 M.Sc., Semnan Municipality, Semnan, Iran

Abstract

This study investigates the damping ratio to evaluate impact force and energy absorption during collisions between adjacent buildings under seismic excitation. Experimental tests using different balls and varying heights were conducted to calculate impact velocity. The case of pounding is carried experimentally out and numerically studied based on an experimental test by using different balls and various heights in order to fall and calculate impact velocity. For this challenge, special element is numerically considered which is included to have spring and dashpot. The stiffness of spring and damping ratio of dashpot needs to be accurately calculated for determining impact value and dissipated energy. The cogency of calculation the value of damping ratio is investigated by defining an impact that is basically described and mathematically simulated with a nonlinear viscoelastic model. Using energy role, energy absorption is calculated, and energy dissipation is estimated. Finally, a new equation of motion in field of damping ratio is approximately suggested, and the accuracy of the formula is numerically confirmed and also compared with the results of experimental analyses. For instance, the results of comparison show a 6% error between numerical study and experimental test. In order to investigate the results of evaluation and compare with other equations and experimental test, another study is generally carried out, which describes same peak impact force about 1192 kN in all various results. Finally, different situations by using various parameters are considered to describe the effect of suggested equation.

Graphical Abstract

An Innovative Model to Determine Damping Ratio based on an Experimental Test during Collision

Highlights

  • Pounding phenomena is accorded when two adjacent structures are built close to each other without sufficient separation distance.
  • In order to calculate impact force, a special parameter is numerically considered, which is called damping ratio and is determined by using stiffness, velocity and masses.
  • Comparison of experimental results and numerical analysis is able to confirm the accuracy of suggested formula in order to calculate the value of damping ratio.
  • Basically, dissipated energy and absorb energy by experimental test and numerical analysis are collected to compare and confirm the equations.

Keywords

Main Subjects

References

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History

  • Receive Date: 17 May 2024
  • Revise Date: 20 July 2024
  • Accept Date: 07 November 2024

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