Torsional balance of plan‐asymmetric structures with frictional dampers: experimental results

Vial, Ignacio; Llera, Juan Carlos de la; Almazán, José L.; Ceballos, Víctor

doi:10.1002/eqe.610

Cited by 21 publications

(15 citation statements)

References 7 publications

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“…Furthermore, response reduction factors are for most cases larger than 1, which implies that the use of FD in the structure simultaneously reduces the displacement demand at both edges of the plan. Results for other more exible structures as well as with other damper capacities follow similar trends [19].…”

Section: Ground Motions and Responses Considered In The Analysissupporting

confidence: 70%

Torsional balance of plan-asymmetric structures with frictional dampers: analytical results

Llera

Almazán

Vial

2005

Earthquake Engng Struct. Dyn.

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SUMMARYThis investigation deals with the torsional balance of the earthquake response and design of elastic asymmetric structures with frictional dampers. Plan asymmetry leads to an uneven lateral deformation demand among structural members and to unbalanced designs with larger capacities in some resisting planes. Frictional dampers are capable of controlling lateral-torsional coupling by placing the so-called empirical center of balance (ECB) of the structure at equal distance from all edges of the building. This rule is developed for single-story systems with linear and inelastic behavior. However, recently obtained theoretical and experimental results demonstrate that this rule carries over to multistory structures. Results show that the peak displacement demand at the building edges and that of resisting planes equidistant from the geometric center may be similar if the damper is optimally placed. It is also shown that torsional ampliÿcation of the edge displacements of arbitrary asymmetric structures relative to the displacement of the symmetric counterparts are approximately bound by a factor of 2. Furthermore, frictional dampers are equally e ective in controlling lateral-torsional coupling of torsionally exible as well as sti structures.

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Section: Ground Motions and Responses Considered In The Analysissupporting

confidence: 70%

Torsional balance of plan-asymmetric structures with frictional dampers: analytical results

Llera

Almazán

Vial

2005

Earthquake Engng Struct. Dyn.

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“…It is interesting to note from this figure that Criteria A and B lead exactly to the same optimal damper eccentricity. Thus, we have shown experimentally [8] that a minimum of the standard deviation of the maximum lateral displacement in plan occurs when both building edges attain the same value for the standard deviation of their displacements (torsional balance). The normalized standard deviation curves of the lateral displacements of the same structures considered above with e s = 0.2b are shown in Figure 11.…”

Section: Special Case: Harmonic Excitationmentioning

confidence: 91%

“…Because previous articles have shown specific applications of the concept, the emphasis of this article is in the theory of WTB [7][8][9], which may be applied as a design criterion of SD in single and multistory structures, linear or inelastic. This criterion is intended to produce more uniform displacement demand on different resisting planes in plan by modifying the correlation of the lateral and torsional motions.…”

Section: Introductionmentioning

confidence: 99%

“…The first article [7] evaluates torsional balance by means of a parametric study performed on single-story buildings and steel-teflon frictional dampers; the second [8] is an experimental validation (proof) of the concept that was performed on a small shaking table and 6-story building models with the same frictional dampers. The last article [9] is an analytic-experimental study of the WTB in singlestory structures with viscoelastic dampers.…”

Section: Introductionmentioning

confidence: 99%

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Torsional balance as new design criterion for asymmetric structures with energy dissipation devices

Almazán¹,

Llera²

2009

Earthq Engng Struct Dyn

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SUMMARYLateral-torsional coupling in asymmetric-plan buildings leads to correlated translations and rotations of the building plan, which generate uneven distributions of deformation demand among resisting planes. The deformation demand of a resisting plane depends on the relative magnitude of the plan translation and rotation and on the correlation between the two signals. Thus, small rotations highly correlated with building translation may lead to significantly different deformations of the resisting planes at the building edges. Consequently, the use of supplemental dampers is intended not only to reduce the magnitude of the plan translation and rotation, but also the correlation between these motions. For the sake of simplicity, linear viscous dampers are used in this investigation, which properly located in plan lead to a minimum response of the geometric center, thus achieving the same mean-square value of the displacements at the building edges. Mathematically, this condition may be understood as creating zero correlation between the translations and rotation at the geometric center of the plan, which represents an uncoupling in the mean-square sense. Results show that the optimal damper location depends on the static eccentricity and frequency ratio of the bare structure, the total amount of supplemental damping considered, and the frequency content of the excitation. Through a final 6-story model example, the torsional balance concept is demonstrated to work on multistory buildings subjected to bidirectional ground motions.

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“…Parametric studies determined optimal positions of employed friction isolation devices. Later, analytical and experimental studies [14,15] investigated frictional dampers as a means to improve response of asymmetric structures. A so-called weak torsional-balance approach is proposed where the goal of the controlling algorithm is to equalize damage in the structure incited by torsional responses.…”

Section: Introductionmentioning

confidence: 99%

Semi-active control of a torsionally-responsive structure

Shook

Roschke

Lin

et al. 2009

Engineering Structures

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Torsional balance of plan‐asymmetric structures with frictional dampers: experimental results

Cited by 21 publications

References 7 publications

Torsional balance of plan-asymmetric structures with frictional dampers: analytical results

Torsional balance of plan-asymmetric structures with frictional dampers: analytical results

Torsional balance as new design criterion for asymmetric structures with energy dissipation devices

Semi-active control of a torsionally-responsive structure

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