Seismic safety of valuable non-structural elements in RC buildings: Floor Response Spectrum approaches

Bertó, Luisa; Bovo, Marco; Rocca, Irene; Saetta, Anna; Savoia, Marco

doi:10.1016/j.engstruct.2019.110081

Cited by 31 publications

(18 citation statements)

References 32 publications

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“…With reference to the alternative approach, the adoption of the behaviour factor values showed in Figure 3 provides some benefits with respect to the adoption of a unitary q value for all storeys. In fact, the adoption of a behaviour factor higher than the unitary value reduces the high peak floor acceleration values expected at the higher storeys of a multistorey framed building [41]. Further details about the values of the peak floor acceleration obtained for the structures will be provided in the following.…”

Section: The Case Study Buildingmentioning

confidence: 99%

Seismic Performance Assessment of a Multistorey Building Designed with an Alternative Capacity Design Approach

Bovo

Savoia

Praticò

2021

Advances in Civil Engineering

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The actual seismic building codes have a prescriptive nature, and they are principally aimed to guarantee a prescribed life-safety level against a design-level earthquake even if some methods have been proposed to evaluate the seismic performance of a building along its entire service life. Among these, the performance-based seismic design method permits the design of buildings with a more realistic understanding of both risk of life for occupants and economic losses that may occur in future earthquakes. On the other side, the capacity design method, providing criteria to properly spread the inelastic deformation demand between the different structural elements, allows to establish a ductile collapse mechanism avoiding undesired brittle failures. In this context, modern building codes consider the adoption of a single value for the behaviour factor q to be used in the design process. All this should be argued since, especially for buildings characterized by storeys with different uses and occupancy ratios, the adoption of a single value for q could guide the design process to a solution not minimizing the seismic loss. With reference to these aspects, the paper shows the comparison of the seismic responses of a multistorey framed building designed following two different approaches. The first approach, suggested by many international codes, follows the capacity design rules and considers a single value for the behaviour factor valid for the whole building. In this first case, the damage mechanisms could affect, theoretically, every storey of the building. The second approach, proposed here, considers instead the possibility to adopt different behaviour factors to attribute to different storeys. In this way, it is possible to concentrate and localize the most severe earthquake-induced structural damage on (few) storeys, selected by the designers. By means of the seismic performance assessment methodology, the comparison between the two building responses is provided in terms of expected losses during the whole building service life and is reported in terms of both economical loss and human life loss. The results in the paper show that, if different behaviour factors are properly selected for different storeys, the design process can provide a solution characterized by lower values of seismic loss with respect to the case of the design assuming a single-q value.

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Section: The Case Study Buildingmentioning

confidence: 99%

Seismic Performance Assessment of a Multistorey Building Designed with an Alternative Capacity Design Approach

Bovo

Savoia

Praticò

2021

Advances in Civil Engineering

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“…Here R is the structural strength reduction factor, i.e., R = Fe / Fy, whereas Fe and Fy is the elastic seismic force demand and the structural yield force, respectively. Berto et al (2020) found that the PFA of RC structures was significantly mitigated as the nonlinearity of buildings became remarkable. Lepage et al (2012) used shaking table tests and nonlinear THA results to generate an empirical prediction equation for the PFA of RC structures, in which an empirical response modification factor was adopted to account for the structural nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of a nonlinear spectral approach for peak floor acceleration of multi-story bilinear hysteretic buildings

Xiang

Zhang

Fei

et al. 2022

Bull Earthquake Eng

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To protect the acceleration-sensitive non-structural components in a multistory building, a proper seismic design of them against the peak floor acceleration (PFA) is needed. The PFA, therefore, should be estimated in advance. To efficiently estimate the PFA of multi-story buildings at the inelastic stage, a nonlinear modal combination approach is provided in this study. First, for the single-story building (single-degree-offreedom system), a PFA spectral ratio δ is proposed to measure the nonlinear reductions in PFA. A series of time history analysis (THA) revealed that there is a dependable relationship between the PFA spectral ratio δ, the strength reduction factor R, the postyield stiffness ratio α, and the period T of the structure. The scatter of δ is notably smaller than the ductility demand, showing the good feasibility of a δ-R-T-α relationship for predicting δ. Second, for the multi-story building (multi-degree-of-freedom system), the floor acceleration is decoupled in the modal space, the contribution of each mode to the elastic PFA is multiplied by δ to account for the nonlinear reduction in PFA at the inelastic stage. Here δ can be determined by an appropriate δ-R-T-α relationship, while R and α are determined via a modal pushover analysis. The modified modal contributions are combined via the complete-quadratic combination (CQC) rule, forming the modified CQC (MCQC) approach. The PFAs of some 2-, 5-, and 8-story building structures with different degrees of nonlinearity are computed via the THA and the MCQC approach.The results demonstrate the satisfactory accuracy of the MCQC approach. Notably, the effects of nonlinearities associated with the higher-order modes on the nonlinear PFA are well considered in the MCQC approach, thus the un-acceptable over-estimations of the inelastic PFA, which occurs in conventional methods, are avoided.

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“…The test results were utilized to derive ready‐to‐use fragility curves. It is worth noting that, when the building contents are located at higher floor levels, specific approaches have to be applied, for example, Berto et al., 30 Petrone et al., 31 Rodriguez et al 32 …”

Section: Introductionmentioning

confidence: 99%

“…The test results were utilized to derive ready-to-use fragility curves. It is worth noting that, when the building contents are located at higher floor levels, specific approaches have to be applied, for example, Berto et al, 30 Petrone et al, 31 Rodriguez et al 32 Kafle et al 33 carried out an extensive experimental program on the response of rigid blocks. Free-standing components were subjected to seven earthquake time histories using the peak displacement demand as the main intensity measure.…”

Section: Introductionmentioning

confidence: 99%

Seismic assessment of free‐standing artifacts: Full‐scale tests on large shake table

Bertó

Sarno

Fragiadakis

et al. 2023

Earthq Engng Struct Dyn

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Recent severe earthquakes highlighted the high vulnerability of artistic assets. Thus, the seismic assessment and formulation of preservation strategies of artifacts are key challenges of modern earthquake engineering, which require theoretical and experimental investigations. The present paper discusses the outcomes from large scale shake table tests carried out on full‐scale free‐standing artifacts. The study is also aimed at evaluating the reliability of existing simplified formulations to predict the rocking motion activation. Emphasis is on prototypes of marble busts with solid and hollow pedestals with different geometries. Comprehensive tests were performed within “Seismic Resilience of Museum Contents” (SEREME) project, which was recently funded by H2020 Framework Programme – Seismology and Earthquake Engineering Research Infrastructure Alliance for Europe (SERA). Uniaxial and biaxial earthquake natural records with different amplitudes and frequency contents were considered to assess the rocking motion of the sample specimens. Response parameters such as uplift, horizontal and vertical accelerations, angular velocity were measured to assess the rocking response of the sample freestanding busts and pedestals. Coefficients of amplification (CAF) of acceleration were also computed. The value of CAF showed that for solid pedestals they were not significantly influenced by peak ground acceleration (PGA) and earthquake type. Conversely, hollow pedestals, which were characterized by larger values of CAF than solid counterparts, ranging between 1 and 7, were affected by PGA and earthquake characteristics. Finally, the outcomes of the presented shake table tests showed that uplifts and angular velocity are effective measures for assessing rocking occurrence of tested artifacts.

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Seismic safety of valuable non-structural elements in RC buildings: Floor Response Spectrum approaches

Cited by 31 publications

References 32 publications

Seismic Performance Assessment of a Multistorey Building Designed with an Alternative Capacity Design Approach

Seismic Performance Assessment of a Multistorey Building Designed with an Alternative Capacity Design Approach

Feasibility of a nonlinear spectral approach for peak floor acceleration of multi-story bilinear hysteretic buildings

Seismic assessment of free‐standing artifacts: Full‐scale tests on large shake table

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