Wind effects on habitability of base-isolated buildings

Liang, Bo; Xiong, Shishu; Tang, Jiaxiang

doi:10.1016/s0167-6105(02)00300-8

Cited by 26 publications

(9 citation statements)

References 4 publications

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“…This is motivated by the general understanding that vibration effects caused by wind loading in the case of base isolated buildings are negligible. Nevertheless, base isolated buildings [10], even though often low-rise, have low natural frequencies of vibration, thus being potentially wind-sensitive and prone to wind-induced vibrations [11,12]. Thus, the lack of international criteria and standards that account for occupant comfort in base isolated buildings under wind loading does not appear to be fully justified at the present state of the knowledge and the investigation of this problem is a worth research effort, as addressed in this study.…”

Section: Introductionmentioning

confidence: 92%

A Simplified Parametric Study on Occupant Comfort Conditions in Base Isolated Buildings under Wind Loading

Ubertini

Comodini

Fulco

et al. 2017

Advances in Civil Engineering

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Vibrations in buildings can cause occupant discomfort in the form of annoyance, headache, or sickness. While occupant comfort is considered in international standards regarding the design of high rise buildings against wind loading, it is neglected in the design of buildings with seismic protective base isolation systems. Nevertheless, due to their low flexibility, base isolated buildings can be prone to wind-induced vibrations, which makes occupant discomfort a potentially significant serviceability limit state. This paper presents a study on occupant comfort conditions in wind-excited base isolated buildings. A numerical simplified parametric procedure is proposed in order to evaluate the return period of wind events causing human discomfort. A parametric investigation is then presented to evaluate the effects of salient parameters on comfort conditions. The procedure is based on (i) the nonlinear dynamic analysis of the structure modeled as a single-degree-of-freedom oscillator with hysteretic base isolators, (ii) the digital generation of time histories of turbulent wind velocity, and (iii) comfort evaluations based on international standards. Results demonstrate that discomfort conditions can occur a few times in a year, depending upon the wind-exposure of the site, what suggests considering this serviceability limit state in the design of base isolated buildings.

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Section: Introductionmentioning

confidence: 92%

A Simplified Parametric Study on Occupant Comfort Conditions in Base Isolated Buildings under Wind Loading

Ubertini

Comodini

Fulco

et al. 2017

Advances in Civil Engineering

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“…The governing equations of motion for the fixed‐base frame (the superstructure) may be written as follows 23,41

boldM \overset{u}{true} + boldC \overset{u}{true} + boldKu = boldF

where M is the structural mass matrix, C represents the structural damping matrix, and K reflects the structural stiffness matrix.…”

Section: Ufrei Systemmentioning

confidence: 99%

“…An increase in the initial stiffness and damping of a base isolation system is effective in mitigating the response to wind 22,23 . The elastomeric isolators (SREIs or FREIs) may be fabricated using either of the “low‐damped” or “high‐damped” rubber compounds.…”

Section: Introductionmentioning

confidence: 99%

On the wind‐induced motion of unbonded fiber‐reinforced elastomeric isolators: Designing for habitability

Chaghakaboodi

Toopchi‐Nezhad

2020

Struct Control Health Monit

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Summary A large number of studies have verified the satisfactory seismic performance of unbonded fiber‐reinforced elastomeric isolators (UFREIs). Typically, the total height of a UFREI will be shorter than its conventional elastomeric isolator counterpart. The shorter height results in a relatively larger isolator initial horizontal stiffness. The relatively large initial stiffness and damping values of UFREIs might be potentially sufficient in many cases to meet the wind serviceability requirements. However, in real practice, this must be examined for any UFREI system. The purpose of this study is to examine the dynamic wind response of a real UFREI system that its satisfactory seismic response was previously verified through shake table tests. The stochastic wind excitations were simulated in the time domain based on the code‐specified basic wind velocity, gust factor, and exposure category using the Cholesky decomposition technique. The root‐mean‐square (RMS) acceleration response of the UFREI system was calculated and then compared with the threshold of human comfort. The cases where the UFREI system could satisfy the wind serviceability requirements were determined. For the cases where the performance was found unsatisfactory, the wind response of the UFREI system was mitigated with the aid of a set of brittle fuses that serve as supplemental springs to increase the initial stiffness of the base isolation system. A simplified procedure is developed for the design of brittle fuses.

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“…However, in high‐rise buildings that have long periods, the effectiveness of the isolation systems is observed to be limited, as the shift in the fundamental period is relatively lesser. Nevertheless, considering other beneficial aspects such as habitability (occupant comfort) and functionality restoration (no damage to structural and nonstructural components), the base‐isolation systems have also emerged to be one of the attractive solutions for the newly constructed high‐rises against the earthquake and wind loadings 8,9 . Practical applications of the base‐isolation systems are also observed in high‐rise buildings, such as the Sendai MT building at Sendai, Japan (85 m), Nakanoshima Festival Tower at Osaka, Japan (200 m), Shimizu Corporation Tokyo Headquarters at Tokyo, Japan (100 m), etc.…”

Section: Introductionmentioning

confidence: 99%

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

Roy

Saito

Matsagar

2020

Earthq Engng Struct Dyn

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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.

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Wind effects on habitability of base-isolated buildings

Cited by 26 publications

References 4 publications

A Simplified Parametric Study on Occupant Comfort Conditions in Base Isolated Buildings under Wind Loading

A Simplified Parametric Study on Occupant Comfort Conditions in Base Isolated Buildings under Wind Loading

On the wind‐induced motion of unbonded fiber‐reinforced elastomeric isolators: Designing for habitability

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

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