The Modification of the Estimated Seismic Behaviour of R/C Low-Rise Buildings Due to SSI

Askouni, Paraskevi K.; Karabalis, Dimitris L.

doi:10.3390/buildings12070975

Cited by 11 publications

(20 citation statements)

References 52 publications

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“…Domestic and international scholars have conducted numerous studies on this issue. No uniform result has been reached as to whether the interaction effect of soil and structure on the seismic response of an isolated structure is increased or decreased (Askouni and Karabalis, 2022;Zhang and Far, 2022). The interaction between soil and structure in…”

Section: Discussionmentioning

confidence: 99%

Study on the shock-absorbing effect of a new staggered story isolated structure under the long-period earthquake motion

Shu

Wang

et al. 2023

Front. Earth Sci.

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The finite element model of a new staggered story isolated structure is established. Using the time-history analysis method, the dynamic response state of the structure at each time step is calculated by integrating the acceleration time-history data step-by-step. Three different types of seismic waves (ordinary seismic wave, near-fault impulse seismic wave, far-field quasi harmonic and long-period seismic wave) are input respectively for dynamic time history analysis. The result indicates that the new staggered story isolated structure has a good shock absorption effect under the action of three different types of seismic waves. There are certain differences in the shock absorption effect under the three kinds of ground motions. The seismic response under ordinary ground motions is minimal, but the seismic response of the structure increases in response to far-field quasi harmonic and long-period ground motions and the near-field fault pulse ground motions. Meanwhile, the inter-story shear force, inter story acceleration, inter-story displacement, damage, and the energy input are all increasing, However, compared with the aseismic structure, the inter-story shear force is reduced by 48%, the inter-story acceleration is reduced by 23%, the inter-story displacement is reduced by 48%, and the energy dissipation rate of the isolated layer is 65%. In addition, the isolated bearing is in good condition during occasional earthquakes under normal ground motion. However, the bearing exceeds the permissible range during near-fault impulse ground motion and far-field harmonic and long-period earthquakes. Therefore, special consideration should be given to the area where the far-field harmonic and long-period ground motion are involved.

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Section: Discussionmentioning

confidence: 99%

Study on the shock-absorbing effect of a new staggered story isolated structure under the long-period earthquake motion

Shu

Wang

et al. 2023

Front. Earth Sci.

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“…Asymmetrical 3D RC frames were forced to strong ground excitations, providing a response comparison for the boundary ground conditions, i.e., rigid ground or deformable ground [6]. The elastoplastic behaviour of reinforced concrete buildings was found to be altered because of the ground deformability, as in [7].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the direction of the earthquake motion is recognized to have an impact on the structural response in a range of research articles, mostly considering rigid soil by using global quantities for the assessment of the response outcomes [19][20][21][22][23][24][25]. A few works have also considered the soil deformability on the response of RC buildings while regarding a changeable angle of the earthquake direction [5][6][7]. The aforementioned research works have indicated the most detrimental structural response from the perspective of the earthquake direction.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Sequential Excitations on Asymmetrical Reinforced Concrete Low-Rise Framed Structures

Askouni

2023

Symmetry

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In the current research, the elastoplastic behaviour of symmetrical and asymmetrical reinforced concrete buildings is explored by dynamic analysis. The used ground excitations are of sequential type, which is found in the literature to possibly strongly affect the dynamic structural behaviour. The contemporary seismic codes neglect the impact of sequential earthquakes on the seismic response, highlighting a scientific gap necessary to be studied. Within the scope of this study, ordinary 3D reinforced concrete low-rise building frames are forced to sequential ground excitations, as well as to a respective single-occurrence corresponding ground excitation, for comparability reasons. In the present dynamic analyses, the two horizontal directions of the excitations, along with the vertical one, are included in the analysis input. The nonlinear behaviour of reinforced concrete sections under strong strain is considered in the present analyses. The geometrical in-plan asymmetry of the 3D models is expressed by a simply defined ratio. Selected unitless resulting plots of the current dynamic analyses are presented and appropriately discussed given the relative geometrical asymmetry. The role of sequential ground excitations on the dynamic response is recognized, along with the role of simple geometrical symmetry or asymmetry, in the resulting response plots. Thus, useful conclusions are acquired, pointing to remarks on the geometrical structural design helpful for the development of recommendations of seismic provisions.

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“…Fontara [8] used asymetric simple storey bulding for investigattion and it was found that seismic incident angle, ground-motion reference axes and seismic intensity level have important effects on the structural responses. Askouni [9] investigated the effect of soil-structure interaction on the behavior of symmetric and asymmetric RC framed buildings. Seo and Hun [10] used lead-rubber bearing (LRB) isolation systems with super elastic shape memory alloy (SMA) bending bars functioning as damper and self-centering devices.…”

Section: Introductionmentioning

confidence: 99%

Effect of Seismic Isolation on the Performance of High-Rise Buildings with Torsional Instability

et al. 2022

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Seismic bearings have been used to mitigate the harmful effect of the earthquakes. Torsion mode, one of the most important irregularities, generally increases the shear forces to the vertical members such as columns and shear walls in turn this may results in brittle failure of the reinforced concrete (RC) members. Accordingly, it is vital to eliminate the torsion failure mode or switch to the higher modes with lower mass contribution. This study has evaluated the seismic performance of a high-rise building with torsion mode through push-over analysis including nonlinear time history analyses. The damage conditions of RC structural members are defined considering the Eurocode definitions and general performance assessments of the building have been evaluated accordingly. Lead rubber bearings have been used for base isolation system. By using enough number of rubber bearings, the dominant torsion mode (first free vibration mode) has been shifted to higher modes. Various earthquake records have been used in non-linear dynamic analysis to evaluate the positive effects of the bearings. The results revealed that proper arrangement of rubber bearings in structural plan of ground floor can effectively improve dynamic behavior of a high rise building with torsional instability to achieve better seismic performance.

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The Modification of the Estimated Seismic Behaviour of R/C Low-Rise Buildings Due to SSI

Cited by 11 publications

References 52 publications

Study on the shock-absorbing effect of a new staggered story isolated structure under the long-period earthquake motion

Study on the shock-absorbing effect of a new staggered story isolated structure under the long-period earthquake motion

The Effect of Sequential Excitations on Asymmetrical Reinforced Concrete Low-Rise Framed Structures

Effect of Seismic Isolation on the Performance of High-Rise Buildings with Torsional Instability

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