Fragility-Based Performance Evaluation of Asymmetric Single-Story Buildings in Near Field and Far Field Earthquakes

Aziminejad, Armin; Moghadam, Abdolreza S.

doi:10.1080/13632460902837728

Cited by 21 publications

(21 citation statements)

References 21 publications

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“…This model has a balance configuration in which the center of the mass is located between stiffness and strength centers and the strength eccentricity is equal to one-quarter yield eccentricity. This conclusion is consistent with the findings of Aziminejad and Moghadam [26]. Considering other diagrams of Figure 16(a), which is related to structures with flexible diaphragms, it was observed that the degree of flexibility affects the optimal configuration.…”

Section: Proper Configuration Of Stiffness and Strength Centers Insupporting

confidence: 82%

“…The displacement of walls in this model is consistent with that of the symmetric structure. This result is in accordance with the findings of Aziminejad and Moghadam [26]. With increase in the flexibility, while the responses of model 6 have a major similarity to symmetric structures in almost all the degrees of flexibility, in the flexibility of = 0.142 sec and higher values, model 8 offers displacements even less than that of the symmetric model.…”

Section: Proper Configuration Of Stiffness and Strength Centers Insupporting

confidence: 81%

“…Aziminejad and Moghadam [26] showed that, in this model, for eccentricities of yield displacement and strength in the range of −15 to 15%, the distance between centers of strength and stiffness can be assumed to be equal to yield displacement eccentricity with an acceptable approximation. Although these eccentricities are typically used to explain the asymmetry in structures with rigid diaphragm, in some researches conducted on asymmetric structures with flexible diaphragm, the same indices in similar structures to rigid diaphragm were used as convenient definitions [8,19].…”

Section: Configuration Of Stiffness and Strength Centers In Plan-asymmentioning

confidence: 99%

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Seismic Response of Plan‐Asymmetric Structures with Diaphragm Flexibility

Eivani

Moghadam

Aziminejad

et al. 2018

Shock and Vibration

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The seismic behavior of asymmetric structures with a flexible diaphragm was studied by conducting inelastic dynamic time-history analyses. Asymmetric structures with different configurations of mass, stiffness, and strength centers, in combination with a wide range of diaphragm flexibility, were evaluated. The behavior of structures was studied by considering three aspects: (1) effect of structural asymmetry on diaphragms deformation; (2) effect of diaphragm flexibility on demands of the lateral load-resisting elements; (3) optimum configuration of mass, stiffness, and strength centers to limit important engineering demand parameters in asymmetric structures with a flexible diaphragm. The results showed that the shear-dominant deformation of diaphragms is sensitive to both structure asymmetry specifications and the degree of diaphragm flexibility; therefore, it can be used for the qualitative classification of the seismic behavior of structures. Also, the center of strength in structures with flexible diaphragm is more important relative to the stiffness center and has a significant effect on engineering demands at all levels of diaphragm flexibility. Moreover, it was found that a suitable configuration of centers in torsionally stiff structures depends on the degree of diaphragm flexibility, in addition to the intensity of earthquakes (structure yield level) and selected engineering demand parameter.

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Section: Proper Configuration Of Stiffness and Strength Centers Insupporting

confidence: 82%

Section: Proper Configuration Of Stiffness and Strength Centers Insupporting

confidence: 81%

Section: Configuration Of Stiffness and Strength Centers In Plan-asymmentioning

confidence: 99%

See 1 more Smart Citation

Seismic Response of Plan‐Asymmetric Structures with Diaphragm Flexibility

Eivani

Moghadam

Aziminejad

et al. 2018

Shock and Vibration

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“…As shown in Figure 2b, elements stiffness was considered to be independent of their strength. It can be noted that, although current design procedures [17] have been developed based on this assumption, some studies [18,19] show that it does have limitations in some LLREs such as shear walls.…”

Section: Structural Systems and Methodology Of Analysis 21 Buildingmentioning

confidence: 99%

“…Given that W > 1 in the considered models, their responses were predominantly in transitional mode (torsionally stiff systems). The mentioned models are representative of a wide range of asymmetric buildings[19].…”

mentioning

confidence: 99%

Effects of diaphragm flexibility on seismic response of asymmetric-plan buildings

2018

JCE

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Effects of diaphragm flexibility on seismic response of asymmetric-plan buildings The effects of diaphragm flexibility on seismic response of asymmetric-plan buildings are investigated in this paper. The results show that the diaphragm flexibility could induce different effects depending on the asymmetric system characteristics, selected element, level of structure yield, and degree of diaphragm flexibility. When the structure behaves in elastic range, central walls exhibit a significant increase in response, and the situation can further be aggravated by asymmetricity in system. Also, all walls of the structure experience a significant increase in response in nonlinear range, which cannot be ignored.

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A seismic fragility model accounting for torsional irregularity in low‐rise non‐ductile RC moment‐resisting frames

Bhasker

Menon

2021

Earthq Engng Struct Dyn

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Buildings characterized by torsional irregularity are notorious for their vulnerability to earthquakes. However, most fragility/vulnerability models used for regional seismic risk assessment fail to distinguish between buildings with torsionally balanced and unbalanced configurations. The present study aims to develop a seismic fragility model sensitive to torsional irregularity for low-rise non-ductile RC moment frame buildings. To this end, a numerical investigation centred on 13 three-storied plan-asymmetric models, each characterized by a distinct combination of normalized stiffness eccentricity, torsional radius to mass radius of gyration ratio and normalized strength eccentricity, is presented. Using high-dimensional model representation (HDMR), a metamodel for the maximum inter-storey drift under bi-directional seismic action is calibrated, considering average spectral acceleration and the above trio of torsional irregularity descriptors (TIDs) as the predictor variables. Carrying out numerical simulations on limit state functions formulated using the above demand model and appropriate capacity thresholds, the seismic fragility is estimated. The parameters of a lognormal fragility function compatible with the above estimates are determined using the method of maximum likelihood. A strong correlation is observed between the TIDs and the fragility function parameters. This reinforces the importance of accounting for all three TIDs while rating the seismic fragility of a building. Using least-square error minimization technique, a functional relationship is established between the fragility model parameters and the TIDs. The framework described herein provides a simple, yet rational means to develop the next generation of seismic fragility models accounting for one of the most critical factors governing seismic behaviour--'torsional irregularity'.

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Fragility-Based Performance Evaluation of Asymmetric Single-Story Buildings in Near Field and Far Field Earthquakes

Cited by 21 publications

References 21 publications

Seismic Response of Plan‐Asymmetric Structures with Diaphragm Flexibility

Seismic Response of Plan‐Asymmetric Structures with Diaphragm Flexibility

Effects of diaphragm flexibility on seismic response of asymmetric-plan buildings

A seismic fragility model accounting for torsional irregularity in low‐rise non‐ductile RC moment‐resisting frames

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