On the Influence of the Vertical Earthquake Component on Structural Responses of High-Rise Buildings Isolated with Double Friction Pendulum Bearings

Phuong Hoa Hoang,Hoang Nam Phan,Van Nam Nguyen

doi:10.3390/app11093809

Phuong Hoa Hoang, Hoang Nam Phan + Show 1 more

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https://doi.org/10.3390/app11093809

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Abstract

The double friction pendulum (DFP) bearing is adapted from the well-known single friction pendulum (SFP) bearing. This type of bearings has been widely used for structural vibration controls. The main advantage of the DFP is its capacity to accommodate larger displacements as compared with the SFP one. This paper aims to assess the effect of the vertical earthquake component on the seismic behaviour of a base-isolated high-rise building. In this respect, the mathematical model of the building subjected to earthquake excitations with an implementation of a DFP bearing system is established. The model presented herein considers earthquake excitations in horizontal (X and Y) and vertical (Z) directions. A series model of two friction elements is presented for the bearing, where the friction load of the bearing surface is governed by a modified Bouc-Wen model, which is dependent on the sliding velocity and the contact pressure. The numerical results of an example of a base-isolated 9-story steel building subjected to near-source and far-field earthquakes show the high effectiveness of the bearing system in reduction of the seismic response of the building, especially in the near-source region, as well as exhibit considerable effectiveness of the vertical earthquake component on the bearing and structural behaviour.

Highlights

IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
Based on the above discussion, this paper focuses on the modelling of base-isolated high-rise buildings implemented with the double friction pendulum (DFP) bearing system, which considers the effect of the vertical earthquake excitation
The results show the high effectiveness of the isolation system in the reduction of the seismic response of the building

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Seismic isolation devices have long been applied to control the structural response of buildings and to mitigate the extensive damage caused by earthquakes. Structural vibration control techniques under the impact of earthquakes using isolation devices have become one of the core technologies for enhancing the seismic performance of structures in seismic prone areas. These technologies allow a considerable reduction of horizontal seismic actions by shifting the fundamental period of the structures to the range of low spectral acceleration amplitudes [1]

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