Multihazard framework for investigating high‐rise base‐isolated buildings under earthquakes and long‐duration winds

Abstract

Japan experiences a considerable number of low to medium earthquake shocks and long‐duration winds throughout the year, which is relatively more as compared to other different regions of the world. Considering this multihazard scenario, structures designed using the existing guidelines may have significant chances to underestimate the induced distress level in the structure as well as in the energy dissipation devices, which are designed based on traditional peak variables neglecting accumulation of damage. To overcome the shortcoming of the existing assessment technique, a multihazard framework is formulated that deals in estimating probable number of earthquakes and long‐duration winds likely to occur in the design life of a structure. The sequence of design earthquakes and long‐duration winds obtained through the proposed methodology is subsequently implemented in base‐isolated high‐rise buildings of two different heights, which are designed based on Japanese standard. Responses are addressed in terms of displacement and acceleration at isolation and top floor level, force‐deformation and fatigue damage induced in the isolation devices under individual and multihazard scenarios. Results show that a particular range of building exists that is governed by both earthquake and wind events, and it is recommended that design of such building types should include the effects of both hazards. Moreover, the series of events likely to occur in design life of the buildings induce significant damage in the isolators as compared to the individual hazard event, thereby emphasizing a strong need to develop multihazard framework, where the occurrence rate of such extreme events is relatively higher.

Review of Vibration Control Strategies of High-Rise Buildings

“…Mostly, the base isolation technique is used for low- to medium-rise buildings for seismic response mitigation [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. However, recently, the application of isolation is proposed for high-rise buildings [ 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. A detailed review of the base isolation system was recently provided by Beirami Shahabi et al [ 42 ].…”

Performance of a BRB Rc High-Rise Building Under Successive Application of Wind-Earthquake Scenarios

“…During the lifetime of a building, the possibility of earthquake events preceded by wind events, or vis versa, is significantly high in the area like Japan which is prone to earthquakes and typhoons [4]. The objective of the current study is to evaluate the performance of the target building under different scenarios of successive wind and earthquake loadings.…”

A multi‐hazard analysis framework for earthquake‐damaged tall buildings subject to thunderstorm downbursts

“…proposed fragility surfaces for multi‐hazard analysis and assessment of suspension bridges under earthquakes and microbursts. Roy et al 27 . developed a multi‐hazard framework for investigating high‐rise base‐isolated buildings under sequential multiple earthquakes and winds likely to occur in the design life of a structure.…”

“…Martin et al 26 proposed fragility surfaces for multi-hazard analysis and assessment of suspension bridges under earthquakes and microbursts. Roy et al 27 developed a multi-hazard framework for investigating high-rise base-isolated buildings under sequential multiple earthquakes and winds likely to occur in the design life of a structure. Kwag et al 28 transferred a probabilistic risk-assessment framework into a deterministic performance-based framework to consider multiple hazards in structural design, and other studies have focused on the development of vibration control systems for tall buildings to reduce multi-hazard vibrations.…”

“…damage accumulation, fatigue, strength and stiffness deterioration). There are a few studies that account for sequential multi-hazard effects, 1,2,27 but their proposed analysis frameworks require the execution of all hazard analysis in series which is time-consuming and may induce uncertainties by the selection of each event. A more direct analysis framework that builds upon the existing well-established knowledge of single-hazard analysis without requesting its repetition would allow for a more rapid transition from the single-hazard design to multi-hazard design reflecting the current knowledge.…”