Eurocode-Compliant Seismic Analysis and Design of R/C Buildings

Avramidis, Ioannis; Morfidis, Konstantinos; Athanatopoulou-Kyriakou, Asimina; Sextos, Anastasios; Giaralis, Agathoklis

doi:10.1007/978-3-319-25270-4

Cited by 14 publications

(9 citation statements)

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“…Upon convergence of the effective damping ratios (i.e., 3), the obtained pairs of ELPs are used to estimate the peak inter-storey drifts of the shearing frame in Figure 3(a) in conjunction with the input Eurocode 8 elastic response spectrum. This is pictorially shown in Figure 6 where the Eurocode 8 spectrum is plotted against the natural period for the three different values of damping ratio , j=1,2,3 found, in terms of spectral acceleration, , left vertical axis, and in terms of spectral displacement, , right vertical axis.…”

Section: Peak Inelastic Response Estimation Using the Elps And Assessmentioning

confidence: 99%

“…UHS provide the peak seismic response of linear viscously damped single-degree-offreedom (SDOF) oscillators having a pre-specified probability to be exceeded in a given time period as a function of the natural period, T. They are developed for a nominal critical viscous damping ratio , usually taken equal to 5%, and are complemented by damping adjustment factors [2] which reduce linear spectral ordinates in case a higher damping level from the nominal one needs to be adopted. Still, the vast majority of (ordinary) structures are expected to yield under the design seismic action since seismic codes and National regulatory agencies allow for structures to resist severe earthquakes through ductile behavior to achieve costeffective design for reduced strength [3]. In this setting, the problem of estimating the peak inelastic response (i.e., seismic demand) for structures modelled as multi-degree-of-freedom (MDOF) systems subject to smooth linear response UHS arises naturally in code-compliant seismic structural design and assessment.…”

Section: Introductionmentioning

confidence: 99%

“…In view of the above challenges, seismic codes and guidelines [9][10][11][12] favor the use of simplified methodologies for routine seismic design and assessment involving less demanding structural analysis steps compared to nonlinear RHA. In particular, the long-standing forcebased seismic design methodology utilizes modal response spectrum-based analyses applied to linear MDOF FE models in conjunction with modal combination rules without requiring explicit structural seismic performance assessment [3]. Further, displacement-based seismic design and assessment methodologies supporting modern performance-based earthquake engineering utilize nonlinear static (pushover) analyses applied to MDOF FE models to derive detailed pushover curves.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A novel stochastic linearization framework for seismic demand estimation of hysteretic MDOF systems subject to linear response spectra

et al. 2018

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Section: Peak Inelastic Response Estimation Using the Elps And Assessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A novel stochastic linearization framework for seismic demand estimation of hysteretic MDOF systems subject to linear response spectra

et al. 2018

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“…To account for the effect of concrete cracking, the elastic flexural and shear stiffness properties of the RC members were taken, for the structural analysis, equal to one-half of the corresponding stiffness properties of the uncracked elements [23]. However, this rather simplified practice, adopted by EN1998-1 most probably based on designers' convenience criteria, disregards the varying level of cracking expected for different RC structural members during the earthquake-imposed cyclic inelastic deformation (e.g., columns carrying large axial forces are prone to lower cracking compared to members under almost pure flexure) [25]. Moreover, based on the XC3 exposure class (i.e., corrosion induced by carbonation under moderate humidity carbonation [22]), the nominal concrete cover was equal to 0.03 m for the slabs and 0.035 m for beams and columns.…”

Section: Design According To the Eurocodesmentioning

confidence: 99%

Yield frequency spectra and seismic design of code‐compatible RC structures: an illustrative example

Katsanos

Vamvatsikos

2017

Earthq Engng Struct Dyn

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SUMMARYThe seismic design of an 8-story reinforced concrete space frame building is undertaken using a Yield Frequency Spectra (YFS) performance-based approach. YFS offer a visual representation of the entire range of a system's performance in terms of the mean annual frequency (MAF) of exceeding arbitrary global ductility or displacement levels versus the base shear strength. As such, the YFS framework can establish the required base shear and corresponding first-mode period to satisfy arbitrary performance objectives for any structure that may be approximated by a single-degree-of-freedom system with given yield displacement and capacity curve shape. For the 8-story case study building, deformation checking is the governing limit state. A conventional code-based design was performed using seismic intensities tied to the desired MAF for safety checking. Then, the YFS-based approach was employed to redesign the resulting structure working backwards from the desired MAF of response (rather than intensity) to estimate an appropriate value of seismic intensity for use within a typical engineering design process. For this high-seismicity and high-importance midrise building, a stiffer system with higher base shear strength was thus derived. Moreover, performance assessment via incremental dynamic analysis showed that while the code-design did not meet the required performance objective, the YFS-based redesign needed only pushover analysis results to offer a near-optimal design outcome. The rapid convergence of the method in a single design/analysis iteration emphasized its efficiency and practicability as a design aid for practical application.KEY WORDS: performance-based seismic design; seismic code; nonlinear analysis; yield frequency spectra; reinforced concrete; multi-story space frame building.

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“…Ductility is a key-concept in the response of yielding structures subject to very strong earthquake ground motions. Ductility is qualitatively defined as the ability of a cross-section, a structural member, or a structure as a whole to exhibit significant inelastic deformations under cyclic/seismic external loads without losing a significant part of its original stiffness and strength after each loading cycle (Avramidis, Athanatopoulou, Morfidis, Sextos, & Giaralis, 2015). A structural system as a whole must resist the lateral loadings forming a sequence of plastic hinges, which dissipate the input energy via hysteretic behavior.…”

Section: Global Collapse Mechanims Of the Specimenmentioning

confidence: 99%

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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Eurocode-Compliant Seismic Analysis and Design of R/C Buildings

Cited by 14 publications

References 0 publications

A novel stochastic linearization framework for seismic demand estimation of hysteretic MDOF systems subject to linear response spectra

A novel stochastic linearization framework for seismic demand estimation of hysteretic MDOF systems subject to linear response spectra

Yield frequency spectra and seismic design of code‐compatible RC structures: an illustrative example

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

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