Fibre Beam-Column Model for Non-Linear Analysis of R/C Frames: Part I. Formulation

Spacone, Enrico; Filippou, Filip C.; Fabio, Taucer

doi:10.1002/(sici)1096-9845(199607)25:7<711::aid-eqe576>3.0.co;2-9

Cited by 836 publications

(438 citation statements)

References 16 publications

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“…The force-based element formulation (also known as the flexibility-based approach) is based on the interpolation of member end-forces to identify the internal section forces (Kaba and Mahin, 1984;Spacone et al, 1996;Neuenhofer and Filippou, 1997). As a result, for RC components without transverse member loads, the linear variation of the moment along the component can be captured by utilizing a single element even beyond the elastic limit.…”

Section: Simulation Of the Element Flexural Response: Member Modelsmentioning

confidence: 99%

The use of post-earthquake residual displacements as a performance indicator in seismic assessment

Yazgan

Dazio

2011

Georisk: Assessment and Management of Risk for Engineered Syste

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PrefaceModern performance based earthquake engineering addresses design, evaluation, construction, maintenance and decommission of structures and requires that their performance during an earthquake can be predicted with a known degree of accuracy. In this framework the importance of residual displacements is twofold: On one hand they represent a significant source of damage affecting mainly the serviceability and the repairability of the structure. On the other hand, after an earthquake, residual displacements are often the only measurable indicator of the shaking occurred during the earthquake. In the framework of a pre-earthquake design or assessment process, the expected residual displacements need to be predicted; while during a post-earthquake assessment the actual residual displacements can be measured.Within his present doctoral dissertation, Mr. Yazgan developed and validated against experimental evidence a new and original methodology to improve the estimate of maximum deformations occurred during an earthquake taking into account both observable damage and measurable residual displacements. The methodology is based on the Bayesian probabilistic theory and, as a particular novelty, explicitly considers model error. To estimate model error Mr. Yazgan carried out a very extensive study on the numerical modelling of structures under earthquake, which also allowed the formulation of practical modelling recommendations. The quantification of model error is of course of fundamental importance also for any realistic pre-earthquake prediction of residual displacements.The thorough and comprehensive work presented by Mr. Yazgan allows a deep understanding of the challenges relevant to the use of residual displacements in the seismic performance assessment of structures and his developments represent a new effective way to achieve this important goal. Zurich, January 2010Dr. Alessandro Dazio SummarySafety assessment of damaged structures is a pivotal part of the post-earthquake recovery process. As a result of the deformation histories that have occurred during the damaging earthquake, the key structural properties of the columns, beams and walls that contribute to the seismic resistance change. The key structural properties include stiffness, strength and deformation capacity. An accurate estimation of the residual key structural properties is crucial in identifying vulnerability of the damaged structure.These residual structural properties are known to be strongly dependent on the maximum deformations that have occurred. A new post-earthquake assessment method is developed following this premise. After an earthquake, the maximum deformations experienced by a damaged structure can be estimated using the developed method.The essential idea behind the method is to probabilistically estimate the experienced maximum deformations based on the post-earthquake residual displacements and the visible structural damage. The major uncertainties related to the estimated maximum deformations are explicitly treated in the me...

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Section: Simulation Of the Element Flexural Response: Member Modelsmentioning

confidence: 99%

The use of post-earthquake residual displacements as a performance indicator in seismic assessment

Yazgan

Dazio

2011

Georisk: Assessment and Management of Risk for Engineered Syste

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“…The beam-column element with distributed inelasticity and force formulation is selected for the FE model [11]. The element formulation is based on the Navier-Bernoulli's hypothesis.…”

Section: Numerical Fe Modelling Of Buildingmentioning

confidence: 99%

Non-Linear Dynamic Analyses of an Rc Frame Building Collapsed During L’aquila 2009 Earthquake

Mulas¹,

Martinelli²,

Capriotti³

2017

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

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“…The applied formulations allow both geometric and material nonlinearities to be captured. Distributed material plasticity along the element length is considered based on the fiber approach to represent the cross-sectional behavior [14]. Each fiber is associated with a uniaxial stress-strain relationship and the sectional stress-strain state of the beam-column elements is obtained through the integration of the nonlinear uniaxial stress-strain response of the individual fibers in which the section is subdivided.…”

Section: Description Of Structural Modelsmentioning

confidence: 99%

Time-Dependent Seismic Vulnerability Assessment of Rc Buildings Considering Ssi and Aging Effects

Karapetrou¹,

Filippa²,

Fotopoulou³

et al. 2014

Proceedings of the 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. The present study aims at the assessment of the seismic vulnerability of reinforced concrete (RC) buildings taking into account the soil -structure -interaction (SSI) and the aging effects due to reinforcement corrosion. Two-dimensional non-linear dynamic analyses are performed to assess the seismic performance of initial (t=0 years) INTRODUCTIONThe seismic vulnerability of structures is commonly expressed through fragility functions, which provide the probability of exceeding prescribed levels of damage for a wide range of ground motion intensities. The assessment of the structure's seismic fragility represents a major step towards the seismic loss estimation and risk management. The soil conditions, which affect the foundation compliance, as well as the soil structure interaction, have not received much attention within the framework of structural vulnerability assessment. Although some fragility curves are available for different soil conditions taking into account the local site effects ([1]), in general, the influence of SSI effects on the seismic performance of RC structures are assumed to be beneficial and thus they are usually ignored. Nevertheless, it has been recently shown ([2], [3]) that soil deformability as well as foundation compliance may modify the structural response and fragility leading to either beneficial or unfavorable effects depending on the dynamic properties of the soil and the structure as well as the characteristics (frequency content, amplitude, significant duration) of the input motion.In common practice it is also implicitly assumed that the structures are optimally maintained during their lifetime neglecting any deterioration mechanism which may adversely affect their structural performance. On this basis, the impact of progressive deterioration of the material properties caused by aggressive environmental attack is not accounted for. Corrosion of RC members is considered as a primary source of structural deterioration, usually associated to carbonation process and chloride penetration, leading to the variation of the mechanical properties of steel and concrete over time. Consequently, both the safety and the serviceability of RC structures may be affected under the action of seismic (or even static) loading, compromising the ability of the structures to withstand the loads they are designed for. The severe uncertainties involved in corrosion phenomena pointed out the need for a probabilistic approach to predict degradation phenomena [4]. Recognizing the importance of this issue, researchers have introduced several probabilistic models into the time-variant vulnerability assessment of corroded bridges and RC frame buildings (e.g. [5], [6], [7]).Based on the above considerations, the aim of this study is the development of timedependent fragility curves taking into account the SSI and aging effects. To demonstrate the methodology for the time-dependent vulnerability assessment, two reference RC moment resisting frames are selected as case studies. In total, eight structu...

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Fibre Beam-Column Model for Non-Linear Analysis of R/C Frames: Part I. Formulation

Cited by 836 publications

References 16 publications

The use of post-earthquake residual displacements as a performance indicator in seismic assessment

The use of post-earthquake residual displacements as a performance indicator in seismic assessment

Non-Linear Dynamic Analyses of an Rc Frame Building Collapsed During L’aquila 2009 Earthquake

Time-Dependent Seismic Vulnerability Assessment of Rc Buildings Considering Ssi and Aging Effects

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