Rigid-plastic approximation to predict plastic motion under strong earthquakes

Paglietti, A.; Porcu, Maria Cristina

doi:10.1002/1096-9845(200101)30:1<115::aid-eqe999>3.0.co;2-v

Cited by 18 publications

(7 citation statements)

References 7 publications

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“…The broken lines in Figures 5(a) and (b) show the rigid-plastic spectra in terms of the relative peak displacement, d max , for the N-S component of the JMA record of the Kobe 1995 Earthquake and the 360 component of the Sylmar record of the Northridge 1994 Earthquake, respectively. As already pointed out by Paglietti et al [16], the rigid-plastic spectrum intercepts the horizontal axis at a value corresponding to the Peak Ground Acceleration (PGA), since the system remains in the rigid domain if its strength is such that a y PGA. On the other hand, if the system cannot resist lateral loading at all, i.e.…”

Section: Rigid-plastic Spectramentioning

confidence: 85%

“…As first pointed out by Paglietti and Porcu [16], and independently by Marubashi et al [10], the dynamic response of rigid-plastic oscillators with lateral yield strength F y and mass m subjected to a given earthquake depends only on the quantity F y /m. Physically, F y /m is the ground acceleration at the onset of plastic behaviour if the system starts from rest, which conveniently may be designated a y .…”

Section: Rigid-plastic Spectramentioning

confidence: 93%

“…In fact, for strong earthquakes, the structure may be designed in such a way that plastic hinges 'perform' mainly in the non-linear range and the remaining part in the elastic domain. Thus, elastic deformations are very small when compared with the magnitude of plastic deformations, making their contribution to dynamic response, including resonance effects, negligible [16].…”

Section: Introductionmentioning

confidence: 99%

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Rigid‐plastic seismic design of reinforced concrete structures

Costa

Bento

Levtchitch

et al. 2006

Earthq Engng Struct Dyn

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In this paper a new seismic design procedure for Reinforced Concrete (R/C) structures is proposed-the Rigid-Plastic Seismic Design (RPSD) method. This is a design procedure based on Non-Linear Time-History Analysis (NLTHA) for systems expected to perform in the non-linear range during a lifetime earthquake event. The theoretical background is the Theory of Plasticity (Rigid-Plastic Structures).Firstly, a collapse mechanism is chosen and the corresponding stress field is made safe outside the regions where plastic behaviour takes place. It is shown that this allows the determination of the required structural strength with respect to a pre-defined performance parameter using a rigid-plastic response spectrum, which is characteristic of the ground motion alone. The maximum strength demand at any point is solely dependent on the intensity of the ground motion, which facilitates the task of distributing required strength throughout the structure.Any artificial considerations intended to adjust results according to empirical observations are avoided, which, from a conceptual point of view, is considered to be an advantage over other simplified design procedures for seismic design.The procedure is formulated using a step-by-step format followed by a design example of a 4-storey-R/C-plane-frame. Results are compared with refined NLTHA and found to be extremely encouraging.Gutierrez and Alpizar [6] also pointed out that ERS omits important information such as the failure modes, required global ductility and corresponding inelastic deformation of structural elements and components, which are essential to verify the seismic performance of the structure.A significant improvement in the development of simplified seismic design procedures was the so-called Capacity Spectrum Method, initially proposed by Freeman [7]. This is a non-linear static

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Section: Rigid-plastic Spectramentioning

confidence: 85%

Section: Rigid-plastic Spectramentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Rigid‐plastic seismic design of reinforced concrete structures

Costa

Bento

Levtchitch

et al. 2006

Earthq Engng Struct Dyn

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“…For the purpose of practical application of the method, a simple procedure is provided in the paper which leads to an estimation of the peak relative displacement of the disconnected mass under a given earthquake. This procedure is based on the earthquake rigid-plastic pseudo-spectrum, which is a single curve diagram introduced in [3], providing the peak displacements of rigid-plastic oscillators as a function of the ratio between yield load and mass of the oscillator, cf. [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…This procedure is based on the earthquake rigid-plastic pseudo-spectrum, which is a single curve diagram introduced in [3], providing the peak displacements of rigid-plastic oscillators as a function of the ratio between yield load and mass of the oscillator, cf. [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Reducing seismic stress on buildings through inertia limiters at floor level

Porcu

2013

WIT Transactions on the Built Environment

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Hybrid data‐driven hazard‐consistent drift models for SMRF

Zahra

Macedo

Mariotti

2023

Earthq Engng Struct Dyn

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The seismic design and assessment of steel moment resisting frames (SMRFs) rely heavily on drifts. It is unsurprising, therefore, that several simplified methods have been proposed to predict lateral deformations in SMRFs, ranging from the purely mechanics‐based to the wholly data‐driven, which aim to alleviate the structural engineer's burden of conducting detailed nonlinear analyses either as part of preliminary design iterations or during regional seismic assessments. While many of these methods have been incorporated in design codes or are commonly used in research, they all suffer from a lack of consideration of the causal link between the seismic hazard level and the ground‐motion suite used for their formulation. In this paper, we propose hybrid data‐driven models that preserve this critical relationship of hazard‐consistency. To this end, we assemble a large database of non‐linear response history analyses (NRHA) on 24 SMRFs of different structural characteristics. These structural models are subjected to 816 ground‐motion records whose occurrence rates and spectral shapes are selected to ensure the hazard consistency of our outputs. Two sites with different seismic hazards are examined to enable comparisons under different seismic demands. An initial examination of the resulting drift hazard curves allows us to re‐visit the influence of salient structural modelling assumptions such as plastic resistance, geometric configurations and joint deterioration modelling. This is followed by a machine learning (ML)‐guided feature selection process that considers structural and seismic parameters as well as key static response features, hence the hybrid nature of our models. New models for inter‐storey drift and roof displacements are then developed. A comparison with currently available formulations highlights the significant levels of overestimation associated with previously proposed non‐hazard consistent models.

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Rigid-plastic approximation to predict plastic motion under strong earthquakes

Cited by 18 publications

References 7 publications

Rigid‐plastic seismic design of reinforced concrete structures

Rigid‐plastic seismic design of reinforced concrete structures

Reducing seismic stress on buildings through inertia limiters at floor level

Hybrid data‐driven hazard‐consistent drift models for SMRF

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