Assessment of the diaphragm condition for floor systems used in urban buildings

Tena‐Colunga, Arturo; Chinchilla-Portillo, Karen Lineth; Juãrez-Luna, Gelacio

doi:10.1016/j.engstruct.2015.03.025

Cited by 31 publications

(23 citation statements)

References 27 publications

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“…As pointed out by Tena-Colunga et al [6], the stiffness properties of some concrete diaphragms such as two-way concrete slabs, ribbed RC slabs, and RC waffle flat slabs in two main directions are the same and therefore an isotropic material modeling can be used to model their stiffness properties in the elastic range. In modeling, the overall diaphragm stiffness was considered and the flexural stiffness of the diaphragm beams was not considered explicitly.…”

Section: Studied Modelsmentioning

confidence: 99%

“…Studies have shown that, with increase in flexibility, the effects of stiffness eccentricity and consequently the torsional response of the structures reduce significantly [8]. This performance has been introduced as one of the noticeable advantages of diaphragm flexibility [6].…”

Section: A Review Of Previous Studies On Flexibility Of Seismic Diaphmentioning

confidence: 99%

“…For example, it increases the natural vibrational periods of structures [1,3], and also the participation of higher modes in structural response [14,15]. An increase in the period, depending on the natural period of the initial structure with rigid diaphragm and the soil type, can cause an increase in the spectral acceleration (ascending branch), decrease in spectral acceleration (descending branch), or no change in the spectral acceleration (fixed branch) in structures with diaphragm flexibility [6]. Also, diaphragm flexibility can lead to the modification of mode shapes and cause a phenomenon called "mode shift" in which some modes of the structure with rigid diaphragm appear in higher modes of similar structures with a flexible diaphragm [13].…”

Section: A Review Of Previous Studies On Flexibility Of Seismic Diaphmentioning

confidence: 99%

“…The type of floor system is an important factor in the degree of diaphragm flexibility. Many types of reinforced concrete floors such as prestressed beam and block [4], RC waffle slabs [5], ribbed RC slabs [6], and the traditional beam and block floor systems [7] can be considered as flexible diaphragms under certain conditions. Based on previous studies, diaphragm flexibility depends not only on the floor type, but also on other parameters such as the diaphragm aspect ratio and ratio of diaphragm stiffness to adjoining lateral elements stiffness [6].…”

Section: Introductionmentioning

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: Studied Modelsmentioning

confidence: 99%

Section: A Review Of Previous Studies On Flexibility Of Seismic Diaphmentioning

confidence: 99%

Section: A Review Of Previous Studies On Flexibility Of Seismic Diaphmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seismic Response of Plan‐Asymmetric Structures with Diaphragm Flexibility

Eivani

Moghadam

Aziminejad

et al. 2018

Shock and Vibration

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“…Other authors studied this problem (Ju and Lin, 1999 [22] [27]), observing the differences of results of modal parameters and stresses, obtained by different modeling methods and using the hypothesis of rigid floor or not.…”

Section: State Of the Artmentioning

confidence: 99%

Influence of Rigid Floor Assumption in Seismic Analysis of Rc Existing Buildings

Porco¹,

Ruggieri²,

Raffaele³

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Assessment of the in-plane deformability of RC floors with traditional and innovative lightening elements in RC framed and wall structures

Pecce

Ceroni

Maddaloni

et al. 2017

Bull Earthquake Eng

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In this paper, the in-plane deformability of floors in Reinforced Concrete (RC) structures has been investigated in order to establish the role of lightening elements made of both traditional ceiling bricks and Expanded Polystyrene (EPS) blocks. The study has been firstly developed via the implementation of three-dimensional finite element models simulating the real geometry of the floors. The numerical results have been, then, used to assess the thickness of equivalent slabs introduced in three-dimensional finite elements models of simple structures made of Reinforced Concrete frames or walls. These models have been used for verifying the effective in-plane floor deformability as a function of the vertical resistant elements typology (frames or walls), the building geometry (plane shape ratio, height, number of floor, dimensions of vertical elements), and the thickness of the equivalent slab. The numerical analyses have enabled to give interesting indications about the reliability of the hypothesis of rigid floors as the investigated parameters change

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Assessment of the diaphragm condition for floor systems used in urban buildings

Cited by 31 publications

References 27 publications

Seismic Response of Plan‐Asymmetric Structures with Diaphragm Flexibility

Seismic Response of Plan‐Asymmetric Structures with Diaphragm Flexibility

Influence of Rigid Floor Assumption in Seismic Analysis of Rc Existing Buildings

Assessment of the in-plane deformability of RC floors with traditional and innovative lightening elements in RC framed and wall structures

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