Proposed Configurations for the Use of Smart Dampers with Bracings in Tall Buildings

Aly, Aly Mousaad; Zasso, Alberto; Resta, Ferruccio

doi:10.1155/2012/251543

Cited by 7 publications

(5 citation statements)

References 20 publications

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“…In recent years magnetorheological (MR) dampers have been verified with the unique ability to create the resisting force following the change of various characteristics. In Aly et al [65,66], MR dampers are placed in the tower as an alternative to TMDs and ATMD to reduce the wind-induced responses. The challenge in using such devices in tall buildings is related to where to put the device in the building.…”

Section: Magnetorheological Fluid Dampersmentioning

confidence: 99%

“…The benefits of using dampers in tall buildings under wind loads are discussed in Hart and Jain [67]. Magnetorheological dampers were used to reduce the acceleration and the design loads of the tower in the two lateral directions ( [65,66], see Figure 20). The authors are currently investigating proper techniques that can be used for mitigation under multihazard loading brought by both wind and earthquakes.…”

Section: Magnetorheological Fluid Dampersmentioning

confidence: 99%

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On the Design of High-Rise Buildings for Multihazard: Fundamental Differences between Wind and Earthquake Demand

Aly

Abburu

2015

Shock and Vibration

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In the past few decades, high-rise buildings have received a renewed interest in many city business locations, where land is scarce, as per their economics, sustainability, and other benefits. Taller and taller towers are being built everywhere in the world. However, the increased frequency of multihazard disasters makes it challenging to balance between a resilient and sustainable construction. Accordingly, it is essential to understand the behavior of such structures under multihazard loadings, in order to apply such knowledge to design. The results obtained from the dynamic analysis of two different high-rise buildings (54-story and 76-story buildings) investigated in the current study indicate that earthquake loads excite higher modes that produce lower interstory drift, compared to wind loads, but higher accelerations that occur for a shorter time. Wind-induced accelerations may have comfort and serviceability concerns, while excessive interstory drifts can cause security issues. The results also show that high-rise and slender buildings designed for wind may be safe under moderate earthquake loads, regarding the main force resisting system. Nevertheless, nonstructural components may present a significant percentage of loss exposure of buildings to earthquakes due to higher floor acceleration. Consequently, appropriate damping/control techniques for tall buildings are recommended for mitigation under multihazard.

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Section: Magnetorheological Fluid Dampersmentioning

confidence: 99%

Section: Magnetorheological Fluid Dampersmentioning

confidence: 99%

On the Design of High-Rise Buildings for Multihazard: Fundamental Differences between Wind and Earthquake Demand

Aly

Abburu

2015

Shock and Vibration

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“…To improve the structural behavior some active or passive mass dumpers solutions could be considered [6,[54][55][56]. In the present case, a solution represented by TMD is taken into account.…”

Section: Installation Of Dampersmentioning

confidence: 99%

Structural Improvements for Tall Buildings under Wind Loads: Comparative Study

Longarini

Cabras

Zucca

et al. 2017

Shock and Vibration

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The behavior of a very slender building is investigated under wind loads, to satisfy both strength and serviceability (comfort) design criteria. To evaluate the wind effects, wind tunnel testing and structural analysis were conducted, by two different procedures: (i) Pressure Integration Method (PIM), with finite element modeling, and (ii) High Frequency Force Balance (HFFB) technique. The results from both approaches are compared with those obtained from Eurocode 1 and the Italian design codes, emphasizing the need to further deepen the understanding of problems related to wind actions on such type of structure with high geometrical slenderness. In order to reduce wind induced effects, structural and damping solutions are proposed and discussed in a comparative study. These solutions include (1) height reduction, (2) steel belts, (3) tuned mass damper, (4) viscous dampers, and (5) orientation change. Each solution is studied in detail, along with its advantages and limitations, and the reductions in the design loads and structural displacements and acceleration are quantified. The study shows the potential of damping enhancement in the building to mitigate vibrations and reduce design loads and hence provide an optimal balance among resilience, serviceability, and sustainability requirements.

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“…The research results indicated that the use of torsion springs in rotational friction dampers is more effective in improving the seismic performance of structures than traditional dampers. Ribakov et al [16][17][18] studied different forms of the inclined brace lever damping system and proposed an optimal design program to realize the design of the lever damping system, demonstrating that this system possessed a good control effect on the inter-story displacement of the structure through numerical simulation. Combining a lever amplification device with a viscous damping wall, He et al [19,20] conducted model and vibration table experiments, revealing that this new amplification viscous damping wall had a significant energy dissipation ability.…”

Section: Introductionmentioning

confidence: 99%

Study on Vibration Reduction Effect of the Building Structure Equipped with Intermediate Column–Lever Viscous Damper

Zhou,

Pan,

Lan

2024

Buildings

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Generally speaking, the traditional lever amplification damping system is installed between adjacent columns in a building, which occupies a significant amount of space in the building. In contrast to amplification devices in different forms, the damper displacement of the intermediate column damper system is smaller, and the vibration reduction efficiency is lower. In light of these drawbacks, this study proposes a new amplification device for energy dissipation and vibration reduction, which is based on an intermediate column–lever mechanism with a viscous damper (CLVD). Initially, a specific simplified mechanical model of CLVD is derived. Subsequently, an equivalent Kelvin mechanical model of CLVD is derived to intuitively reflect CLVD’s damping and stiffness effect. The damping ratio added by CLVDs to the structure is calculated according to that model; the additional damping ratio and additional stiffness are utilized to calculate the displacement ratio Rd and shear force ratio Rv of the structure with CLVDs to the structure without CLVDs. Rd and Rv are introduced to evaluate the vibration reduction effect of the structure with CLVDs, and the effects of various parameters (such as intermediate column position, beam’s bending line stiffness, lever amplification factor, damping coefficient, and earthquake intensity) on Rd and Rv are analyzed. The results indicate that when the ratio of the distance from the intermediate column to the edge column to the span of the beam is 0.5, CLVD owns the optimal vibration reduction effect. Increasing the beam’s bending line stiffness is beneficial for CLVD to control structural displacement and shear force; when the leverage amplification factor is too large, the CLVD provides the structure with stiffness as the main factor, followed by damping. Additionally, when the ratio of the displacement amplification factor to the geometric amplification factor satisfies fd/γ = 1/21−0.5α, the CLVD has the optimal displacement control effect on the structure. After that, measures are provided to optimize the CLVD in different situations in order to effectively control the inter-story displacement and the story shear force of the structure. Consequently, a nine-story frame is taken as an example to elaborate the application of CLVDs in the design for energy dissipation and vibration reduction. The results reveal that the CLVD scheme adopting the proposed optimization method can effectively enhance the displacement amplification ability of CLVDs, resulting in an additional damping ratio of up to 12%. At the same time, the inter-story displacement was reduced by almost 40% under fortification earthquakes. Through the research in this study, designers can obtain a new choice in structural vibration reduction design.

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Proposed Configurations for the Use of Smart Dampers with Bracings in Tall Buildings

Cited by 7 publications

References 20 publications

On the Design of High-Rise Buildings for Multihazard: Fundamental Differences between Wind and Earthquake Demand

On the Design of High-Rise Buildings for Multihazard: Fundamental Differences between Wind and Earthquake Demand

Structural Improvements for Tall Buildings under Wind Loads: Comparative Study

Study on Vibration Reduction Effect of the Building Structure Equipped with Intermediate Column–Lever Viscous Damper

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