Assessment of seismic behaviour of steel frame structures with Pendulum Tuned mass Dampers and base isolator using 3D analysis

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Semnan University

Abstract

In this paper, evaluation of hybrid control system for achieving optimal frequency of pendulum mass damper mounted on mass center of roof story on 3D structures in different heights and same slenderness ratio (H/B) with nonlinar behaviour has been assessed. For investigation of 3D seismic performance of pendulum mass damper on isolated structures with plan period 2.5 seconds, three structure 6, 9 and 12 stories and intermediate steel miment frame have been considered. These structures have been designed by Load and Resistance Factor Design (LRFD) according to 2800 standard

Optimal frequency ratio among assumed frequency ratios and resulting optimum length of pendul to effect set of PTMD vibration on hybric control system by considering response on both directions, are 0.5 and 2.95 meters for 6 stories structure, respectively, and 0.65 and 2.8 meters for 9 stories structure, respectively. For 12 stories structure, determination of specific frequency ratio as optimal frequency ratio is difficult and with low safety factor.

The more PTMD length, the better performance of hybrid control system, actualy, PTMD has set for less frequency ratio among assumed frequency ratios.

Positive performance of hybrid control system for same frequency ratio, decrease with increasing structure height. In fact, displacement responses, drift ratio, maximum acceleration of roof story and structure base shear less reduced.

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Journal of Civil and Environmental Engineering

Articles in Press, Accepted Manuscript
Available Online from 30 October 2021

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