Case study of seismic performance assessment of irregular RC buildings: hospital structure of Avezzano (L’Aquila, Italy)

Ferraioli, Massimiliano

doi:10.1007/s11803-015-0012-7

Cited by 38 publications

(23 citation statements)

References 7 publications

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“…The paper also investigated the suitability of the linearized elastic model for the analysis of the accidental torsional effects. The lateral-torsional response of structures was extensively studied in the literature [51][52][53][54]. Although the magnitude of shear and torque generated in an elastomeric isolated structure is generally less than that of the fixed-base structure, in general, the torsional amplifications cannot be ignored.…”

Section: Resultsmentioning

confidence: 99%

Base Isolation for Seismic Retrofitting of a Multiple Building Structure: Evaluation of Equivalent Linearization Method

Ferraioli

Mandara

2016

Mathematical Problems in Engineering

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Although the most commonly used isolation systems exhibit nonlinear inelastic behaviour, the equivalent linear elastic analysis is commonly used in the design and assessment of seismic-isolated structures. The paper investigates if the linear elastic model is suitable for the analysis of a seismically isolated multiple building structure. To this aim, its computed responses were compared with those calculated by nonlinear dynamic analysis. A common base isolation plane connects the isolation bearings supporting the adjacent structures. In this situation, the conventional equivalent linear elastic analysis may have some problems of accuracy because this method is calibrated on single base-isolated structures. Moreover, the torsional characteristics of the combined system are significantly different from those of separate isolated buildings. A number of numerical simulations and parametric studies under earthquake excitations were performed. The accuracy of the dynamic response obtained by the equivalent linear elastic model was calculated by the magnitude of the error with respect to the corresponding response considering the nonlinear behaviour of the isolation system. The maximum displacements at the isolation level, the maximum interstorey drifts, and the peak absolute acceleration were selected as the most important response measures. The influence of mass eccentricity, torsion, and high-modes effects was finally investigated.

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Section: Resultsmentioning

confidence: 99%

Base Isolation for Seismic Retrofitting of a Multiple Building Structure: Evaluation of Equivalent Linearization Method

Ferraioli

Mandara

2016

Mathematical Problems in Engineering

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“…The conventional approach is based on the assumption that the structure vibrates predominantly in a single mode and that the dynamic properties of the structure remain unchanged. The first assumption is not always fulfilled, especially in the case of torsionally flexible plan-asymmetric and/or high-rise buildings [8][9][10]. The second assumption neglects the progressive changes in the modal properties due to structural yielding.…”

Section: Pushover Methods and Estimation Of Target Displacementmentioning

confidence: 99%

P11.01: A multi‐mode pushover analysis procedure to estimate seismic demands for steel moment‐resisting frames

2017

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The main objective of the paper is the development and evaluation of a multi-mode pushover procedure for the approximate analysis of the seismic response of steel moment-resisting frames. A generalized force vector derived from modal combination simulates the instantaneous force distribution acting on the structure when the interstorey drift reaches its maximum value during the dynamic response to a seismic excitation. A set of generalized force vectors (each associated to maximum drift at one story) is applied separately to the structure until the corresponding target interstorey drift is attained. The envelope of results gives the maximum value of each response parameter. The proposed pushover procedure allows a simple implementation, reducing the computational effort compared with adaptive nonlinear static procedures and nonlinear response history analysis. Moreover, it does not suffer from the statistical combination of inelastic modal responses calculated separately. Its effectiveness and accuracy are verified through a comparative study involving regular steel moment resisting frames subjected to acceleration records.

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“…where u y is the yield displacement of Wall Y 1 . The figure shows that the yielding of Wall Y 1 occurs at the intersection of Equations (22) and (23). As will be discussed later, this coordinate system is very convenient to describe the inelastic torsional behavior of plan-asymmetric structures.…”

Section: Torsional Response Of Asymmetric Structures In the D-r Coordmentioning

confidence: 96%

“…Figure 8 schematically shows the typical lateral-torsional responses of asymmetric structures obtained using three different approaches on the D-R coordinate system based on the discussion up to this point. In the figure, the dashed line represents the linear elastic torsional response given by Equation (22), and the dotted line is the amplified linear elastic torsional response, which is adopted in most of the current design codes in terms of the amplified design eccentricity, as already discussed in Section 2. The solid line represents the inelastic torsional response based on the procedure presented in this section.…”

Section: (4) Second Yielding Pointmentioning

confidence: 99%

“…Cho et al [19] proposed a modified three-dimensional capacity spectrum method to efficiently evaluate the seismic behavior of a building structure with asymmetric walls. The application of plan-asymmetric analysis techniques to multi-story building structures was discussed by several researchers [20][21][22] by explicitly considering the nonlinear torsional and higher-order effects. Anagnostopoulos et al [23] published an excellent review paper on the earthquake induced torsion in buildings by grouping various publications into a number of subtopics.Considering all these issues, this paper proposes a simple method that can accurately assess the inelastic lateral displacement and rotation of plan-asymmetric wall structures.…”

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Effective Assessment of Inelastic Torsional Deformation of Plan-Asymmetric Shear Wall Systems

Hong

Cho

et al. 2019

Applied Sciences

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Torsional deformation may occur in plan-asymmetric wall structures during seismic events. In most current seismic design codes, the torsional deformation is handled using the concept of design eccentricity, in which design loads may be excessively amplified. This approach has limitations in accurately estimating the torsional deformation of the plan-asymmetric structures, mainly because it is based on linear elastic material behavior. In this paper, we propose a simple method that can accurately evaluate the inelastic lateral displacement and rotation of plan-asymmetric wall structures and is suitable for use in the displacement-based design method. The effectiveness of the proposed method is verified by comparing its predictions with the results of rigorous time history analyses for a model problem. The comparison shows that the proposed method is able to provide accurate estimates of the inelastic torsional deformation for the plan-asymmetric wall system, while requiring less computational cost than the time history analysis. become quite different from those in the elastic range. Some of the current design code provisions provide a simple solution to this problem by introducing the so-called accidental eccentricity, which is equivalent to the elastic eccentricity amplified by a certain factor. However, this accidental eccentricity may require excessive strength and stiffness for lateral force resisting components since it does not properly consider the actual torsional failure mechanism of the structure.There has been a lot of research performed to remove the limitations of the current seismic design codes and develop a proper design process. Early stage research on this issue focused on the force-based design approach, which still offers the theoretical basis to most of the current practical design codes. The main issue with this approach was the reasonable determination of design eccentricities. In [9], Goel and Chopra first proposed a design eccentricity based on the inelastic torsional behavior of plan-asymmetric structures by considering two performance levels, i.e., serviceability and ultimate limit states. However, their approach may overestimate the strength of relative flexible wall components. To handle this issue, Duan and Chandler [10] suggested a modified design eccentricity that provides optimal ductility requirements and overstrength factors on both flexible and stiff wall components, but it still may underestimate the design eccentricity at the intermediate inelastic stage. Humar and Kumar [11] investigated the effect of wall components perpendicular to the excitation direction based on concepts similar to those proposed in [9,10].The displacement-based design approach has also been researched to properly handle this issue. Since the deformation is a better measurement of structural performance than strength or stiffness, most recently proposed design methodologies adopt this approach. In [12,13], Paulay estimated the required system ductility of an asymmetric structure based on its torsional m...

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Case study of seismic performance assessment of irregular RC buildings: hospital structure of Avezzano (L’Aquila, Italy)

Cited by 38 publications

References 7 publications

Base Isolation for Seismic Retrofitting of a Multiple Building Structure: Evaluation of Equivalent Linearization Method

Base Isolation for Seismic Retrofitting of a Multiple Building Structure: Evaluation of Equivalent Linearization Method

P11.01: A multi‐mode pushover analysis procedure to estimate seismic demands for steel moment‐resisting frames

Effective Assessment of Inelastic Torsional Deformation of Plan-Asymmetric Shear Wall Systems

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