Design of Buildings with Seismic Isolation Using Linear Quadratic Algorithm

Chang, Chia‐Ming; Shia, Syuan; Yang, Cheng-Ta

doi:10.1016/j.proeng.2017.09.069

Cited by 8 publications

(2 citation statements)

References 12 publications

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“…Base isolation is a passive control technique that sued to separate the superstructure from the base with a low stiffness layer to transfer the fundamental frequency of structural vibration to a value lower than the frequencies of earthquake ground motions [1][2][3]. The aim of using base isolation devices is to lengthen the fundamental period of the structure by its inherent flexibility to reduce the transmission of energy from the ground [4,5]. This flexible layer is utilized to reduce the amount of force induced by the ground motions such as story accelerations, relative story drift, and story shear forces.…”

Section: Introductionmentioning

confidence: 99%

Seismic performance of double skin semi-base-isolated structures

2020

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Base isolation technology is a popular and powerful isolation technology. This technique can greatly reduce the seismic response of the structure, so as to reduce the damage to the structure. Base isolation method decouples the superstructure from the base by installing a flexible layer under each column to reduce dynamic response in the earthquake and elongate the time period of structures due to its inherent flexibility. However, the long time period causes large displacement. In addition, base isolation devices are highly vulnerable due to uplift forces produced by lateral force resisting systems (LFRS). In this study, an adjustable structure with a new configuration, namely double skin semi-base-isolated (SBI) structure is presented to solve the above problems. The LFRS is omitted in the proposed SBI structure and the time period and displacement are reduced compared to the conventional base-isolated structure. The forcedeformation behavior of an isolator is modeled as bi-linear hysteretic behavior which can be effectively used to model all isolation system in practice. This study investigates the seismic performance of 10-story double skin SBI reinforced concrete (RC) structure under far-fault earthquake ground motion by numerical method. Results demonstrate that the SBI system is significantly adjustable with the use of RC coupling beams between the inner core and outer frames. By increasing or reducing the number of connected floors in the SBI system, dynamic behaviors of the SBI system can be changed. The adjusted structure can be created by adding and removing RC coupling beams at every arbitrary floor level.

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Section: Introductionmentioning

confidence: 99%

Seismic performance of double skin semi-base-isolated structures

2020

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“…Note that in recent years the interest in the study of kinematic supports that provide the seismic resistance of buildings has noticeably increased [9][10][11]. See also [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Seismic stability of oscillating building on kinematic supports

Karnilovich

Петрович²,

Lovetskiy

et al. 2019

Discrete and Continuous Models

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The design of kinematic supports is considered, which allows to damp the oscillation energy of seismic waves during earthquakes. The building rests on supports that have the geometry of straight cylinders. When horizontal ground oscillations occur, the supports are deflected at a small angle. At the same time, their centre of gravity rises and tends to return to its original position under the action of two forces on each support: the weight of the building evenly distributed over all the supports, and the weight of the support itself. The first force is applied to the highest point of the support, the second one is applied to the centre of gravity of the support, so that the rotational moments of two forces act on the support. It should be noted that under very strong vibrations of the ground, the projection of the centre of gravity could move beyond the base of the support. In this case, the supports will begin to tip over. We confine ourselves to considering such deviations that the rotational moments of the forces of gravity still tend to return the supports to their initial state of equilibrium. Key words and phrases: ensuring seismic stability of buildings during earthquakes, the equation of motion of a physical pendulum, vibration damping.

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