An evaluation of the inelastic response of systems under biaxial seismic excitations

Stefano, Mario De; Faella, Giuseppe

doi:10.1016/0141-0296(95)00216-2

Cited by 26 publications

(12 citation statements)

References 5 publications

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“…The capacity of columns in terms of dissipated energy has been also studied. De Stefano and Faella (1996) and Rodrigues (2012) found that columns subjected to bidirectional loadings with constant axial load lead to higher levels of dissipated energy than the observed in columns under uniaxial load. Nevertheless, this is not so evident when varying the axial loads (Rodrigues et al, 2015), just as in extreme or corner columns.…”

Section: The Energy Approach To Seismic Designmentioning

confidence: 96%

“…Unlike uniaxial loading, Sabastini et al (2018) proposed a method to obtain the critical incidence angle in bidirectional seismic loading that produces the maximum response of the structure. De Stefano and Faella (1996) reported that a lumped mass system subjected to bidirectional seismic loading shows a clear tendency to concentrate damage in the stiff direction (lower period), respect to the response obtained under unidirectional loading. In addition, the authors proposed a theoretically overstrength (between 20 and 40%) required to design structures considering only one-component of the earthquake.…”

Section: Waffle-flat Plate Systemsmentioning

confidence: 99%

“…The influence of the spatial effects derived from torsion is also a critical issue in structures subjected to bidirectional loadings (De Stefano & Faella, 1996;Kuang, Jiang, & Jiang, 2018;Magliulo & Ramasco, 2007;Marus̆ić & Fajfar, 2005;Zeris & Mahin, 1991). Buildings can be classified as torsional stiff or torsional flexible, depending on the ratio that relates the first translational period, 1, , with the first torsional period, 1, as Ω = 1, 1, ⁄…”

Section: Waffle-flat Plate Systemsmentioning

confidence: 99%

“…De Stefano and Faella (1996) proposed a yield condition in 2 DOF models under bidirectional loadings represented by an elliptical domain for both strength and displacement, respectively. Bousias (2002) carried out experimental tests on columns under biaxial loading and proposed an ultimate elliptical domain for the chord rotation from the one obtained under uniaxial loadings along the two main axes.…”

Section: The Energy Approach To Seismic Designmentioning

confidence: 99%

“…As pointed out in Chapter 5, there is still controversy in regards to the seismic capacity of structures obtained through independent unidirectional analysis along two orthogonal directions (De Stefano & Faella, 1996;Dutta & Kunnath, 2013;Lee & Hong, 2010;Rodrigues, Furtado, & Arêde, 2015). To shed light to this issue, a comparison is carried out in this section between the capacity of the WFP system with hysteretic dampers (obtained from the analysis under unidirectional seismic loadings using the records 212 Chapter 6 included in Set X and Set Y) and that obtained from the analyses under bidirectional seismic loadings using both components of the records considered in the previous ones.…”

Section: Seismic Capacity Of the Specimen Subjected To Unidirectionalmentioning

confidence: 99%

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Comportamiento sísmico de estructuras con forjados reticulares y disipadores de energía bajo acción simultánea de dos componentes horizontales del terremoto

Lamuela¹

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This Thesis investigates the seismic behavior of reinforced concrete structures consisting of waffle-flat plates supported on isolated columns, without and with hysteretic dampers, subjected to the simultaneous action of two components of the ground motion caused by an earthquake. The methodology applied involves two approaches: the experimental approach (dynamic shaking table tests), and the numerical approach (nonlinear response history analyses with a refined 3D finite element model). The study addresses the response of the structure from the initial elastic stages until collapse. Different parameters are used to characterize the seismic action and to evaluate the response and particular attention is given to the energy.Within the experimental approach, a prototype structure with waffle-flat plates and square columns was first designed following the Spanish structural codes. The structure was assumed to be located in Granada. A portion of this prototype was selected, scaled and built in the Laboratory of Structures of the University of Granada (test specimen). The specimen was tested with a biaxial shaking table using the horizontal components of a far field ground motion. These two components were applied simultaneously, scaled in amplitude to increasing values, until collapse. The analyses of the results allowed to describe in detail the evolution of the response in terms of drifts, rotations in column, forces, local deformations and energy that contributes to damage. Damage concentrated at column bases and at the exterior plate-column connection. The energy input in the structure until collapse under the biaxial seismic action was found very close to that obtained in past tests conducted with a similar specimen subjected to unidirectional seismic loadings. Further, based on the results of the tests, it is proposed to adopt the value = 2 as spectrum reduction factor in force-based seismic design methods.The numerical approach had two parts. The first part consisted on developing a refined 3D finite element model that represented the specimen tested with the shaking table. The model was calibrated with the experimental results to obtain a satisfactory fit between tests results and numerical prediction in terms of displacements and energies. This model was used to conduct a parametric study consisting on nonlinear response history analyses with a large set of ground motions. As a result, the ultimate energy dissipation capacity of this type of structures was evaluated, under uniaxial and under biaxial seismic loadings. In the second part of the numerical study, the model was equipped with displacement-dependent (hysteretic) dampers. A second parametric study was conducted with the new model to evaluate the response and the ultimate energy dissipation capacity of the mixed system. As a global result of the numerical approach, it is concluded that the ultimate energy dissipation capacity of the structure (without or with hysteretic dampers) is a relatively stable amount, scarcely influenced by the characteristic...

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Section: The Energy Approach To Seismic Designmentioning

confidence: 96%

Section: Waffle-flat Plate Systemsmentioning

confidence: 99%

Section: Waffle-flat Plate Systemsmentioning

confidence: 99%

Section: The Energy Approach To Seismic Designmentioning

confidence: 99%

Section: Seismic Capacity Of the Specimen Subjected To Unidirectionalmentioning

confidence: 99%

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Comportamiento sísmico de estructuras con forjados reticulares y disipadores de energía bajo acción simultánea de dos componentes horizontales del terremoto

Lamuela¹

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Estimating structural response to bidirectional seismic excitation using spectrum compatible motions: Performance of a pair of companion spectra

Acharjya,

Santra,

Roy

2024

Earthq Engng Struct Dyn

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Bidirectional analyses covering a range of incidence angles for several records are essential yet challenging for routine design. Recent studies have shown that the response to bidirectional shaking may be estimated per straightforward unidirectional analysis in the most preferred orientation in conjunction with the orthogonal combination rules, and this can also remove the need for various incidence angles. Further, it is well known that the mean response can be estimated with reduced dispersion using fewer spectrum‐compatible records. Combining the advantages of both, a pair of companion spectra independent of period and orientation has recently been developed. While the basis of the companion spectra is established therein from a sound mathematical perspective, the applicability of the proposed spectra to real structures may be revisited, especially to structures sensitive to bidirectional interaction, before recommending the companion spectra for practical design. To achieve this end, following a brief scrutiny of the companion spectra, the performance of the same is critically examined for idealized SDoF analogues and real structures such as bridge piers representative of SDoF systems and buildings with asymmetry using single storey and multistorey models (MDoF systems). The results show that the response of the real structures to bidirectional seismic loading can be reasonably estimated with reduced dispersion using fewer records compatible with the pair of the companion spectra. As such, the critical response parameters may be computed by actual bidirectional analyses or by combining responses to unidirectional analyses under fewer spectrum compatible records. Hence, the pair of companion spectra that can be used as “target” to independently match two components of a chosen record is useful for practical design.

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Generalized corrective eccentricities for nonlinear static analysis of buildings with framed or braced structure

Bosco

Ghersi

Marino

et al. 2017

Bull Earthquake Eng

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An evaluation of the inelastic response of systems under biaxial seismic excitations

Cited by 26 publications

References 5 publications

Comportamiento sísmico de estructuras con forjados reticulares y disipadores de energía bajo acción simultánea de dos componentes horizontales del terremoto

Comportamiento sísmico de estructuras con forjados reticulares y disipadores de energía bajo acción simultánea de dos componentes horizontales del terremoto

Estimating structural response to bidirectional seismic excitation using spectrum compatible motions: Performance of a pair of companion spectra

Generalized corrective eccentricities for nonlinear static analysis of buildings with framed or braced structure

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