Soil Structure interaction effects on optimal characteristics of Tuned Mass Dampers in suspension bridges against near field earthquakes

Articles in Press

Document Type : Original Article

Authors

1 Graduated Student, Faculty of Engineering, Kharazmi University, Tehran, Iran

2 Assistant Professor, Faculty of Engineering, Kharazmi University, Tehran, Iran

3 Associate Professor,, Faculty of Engineering, Kharazmi University, Tehran, Iran

10.22065/jsce.2023.400751.3137

Abstract

Determining the optimal parameters of TMD has a great effect on improving the seismic behavior of long span bridges. Parameters such as mass, damping ratio, angular frequency of damper and geometric characteristics of the structure change the seismic performance of the bridge. The main purpose of this paper is to provide design aid formulas to determine optimal properties of the damper to reduce the seismic response along the longitudinal axis of suspension bridges, taking into account the effects of soil-structure interaction. Therefore, various models of suspension bridges with a constant total length on two types of subsoil (stiff and soft soil) considered under the effect of near field earthquake records. Different values of the ratio of the length of side span to the middle span of the bridges (α) have been assumed. The optimal characteristics of the damper for the bridge has been determined by assuming a mass ratio of 2% for the damper according to different values of α and for each type of soil. Design aid formulas based on those results extracted. Then the effectiveness of the proposed formulas has been evaluated by evaluating them for designing TMD to improve the performance of three different bridge models. The results show the acceptable accuracy of the design aid formulas to determine the efficient values of damping percentage and angular frequency of TMD. Furthermore, it has been observed that by changing the soil stiffness, the optimal parameters and seismic performance of tuned mass damper will be changed to a significant extent. For instance, TMD reduces 40% and 24% the maximum deflection of the bridge deck in stiff and soft soil with respect.

Keywords

Main Subjects

Journal of Structural and Construction Engineering

Articles in Press, Accepted Manuscript
Available Online from 06 October 2023

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History

  • Receive Date: 20 June 2023
  • Revise Date: 02 September 2023
  • Accept Date: 06 October 2023

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