Effect of URM infills on inelastic floor response of RC frame buildings

Surana, Mitesh; Pisode, Mayur; Singh, Yogendra; Lang, Dominik H.

doi:10.1016/j.engstruct.2018.08.078

Cited by 25 publications

(10 citation statements)

References 39 publications

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Section: Time‐history Analysis Resultssupporting

confidence: 82%

“…Note also that, even if with a lower impact, also the peaks associated with higher vibration modes may be reduced due to structural nonlinearity. This was observed also by Surana et al 13 Based on the above considerations, which are corroborated by the discussion of literature and code proposals presented in Section 2, in can be concluded that, with reference to the set of case-study buildings analyzed for this study, the significant parameters influencing the values of the maximum PSA/PFA ratios associated with the resonance with the ith vibration mode at a certain floor are the PFA/PGA value at that floor, the S a (T a = T i ) value, potentially substituted directly by T i , and the PGA value (which is representative of the level of expected nonlinearity in the structure). On the other hand, the shape of the PSA/PFA profile is characterized by a peak associated with the resonance of the secondary element with the structure first vibration mode and with a group of close peaks associated with the resonance with the structure higher modes.…”

Section: Observed General Trendssupporting

confidence: 82%

“…Regarding the PFA distribution, it is worth noting that Equation 6 may yield to a de-amplification of the PFA with respect to the PGA value, especially in bottom floors of high-rise structures. This circumstance has been observed by some authors, 1,12,13 especially when analyzing elastic models, but not by other authors and never in the analyses performed in this study. A comment to this issue will be given in Section 4.2.…”

Section: Psa = Pga𝐶 𝐻𝑖 𝐶 𝑖 (𝑇 𝑎 )supporting

confidence: 51%

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Floor spectra for bare and infilled reinforced concrete frames designed according to Eurocodes

Domenico

Ricci

Verderame

2021

Earthq Engng Struct Dyn

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In this study, nonlinear time‐history analyses are performed to assess the floor response spectra of bare and infilled reinforced concrete framed buildings with different number of stories and designed according to Eurocode provisions for different intensity levels of the seismic action. Infill walls are modeled by neglecting and by accounting for the effects of their out‐of‐plane response and of the in‐plane/out‐of‐plane interaction. To this aim, a recent out‐of‐plane response model is updated and improved. The results of the numerical analyses are compared in order to assess, first, the different floor spectra obtained for bare and infilled buildings and, second, the effect of the in‐plane/out‐of‐plane interaction on the results obtained for infilled buildings. The main parameters influencing the shape and the amplitude of floor response spectra are investigated, namely higher vibration modes, structural nonlinearity, and damping of the secondary element. This is also performed with the support of the discussion and application of current code and literature formulations. Based on the results of the numerical analyses, a simplified code‐oriented formulation for the assessment of floor response spectra in bare and infilled reinforced concrete framed structures is proposed. The proposed formulation may be a useful tool for the seismic assessment and safety check of acceleration‐sensitive nonstructural components.

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Section: Time‐history Analysis Resultssupporting

confidence: 82%

Section: Observed General Trendssupporting

confidence: 82%

Section: Psa = Pga𝐶 𝐻𝑖 𝐶 𝑖 (𝑇 𝑎 )supporting

confidence: 51%

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Floor spectra for bare and infilled reinforced concrete frames designed according to Eurocodes

Domenico

Ricci

Verderame

2021

Earthq Engng Struct Dyn

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“…Finally, it is simply noted that the brief/basic overview proposed here by the authors can be merged with much more specific and detailed explanations of seismic demand criteria and/or formulations for acceleration-sensitive NSEs (amongst others; see [7,12,13,16,[21][22][23][24][25][26][27][28]). Out of these research contributions, the authors would refer interested…”

Section: Seismic Demand On Nsesmentioning

confidence: 99%

Towards Seismic Design of Nonstructural Elements: Italian Code‐Compliant Acceleration Floor Response Spectra

Chichino

Peloso

Bolognini

et al. 2021

Advances in Civil Engineering

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Seismic risk reduction of a building system, meant as primary building structure and nonstructural elements (NSEs) as a whole, must rely upon an adequate design of each of these two items. As far as NSEs are concerned, adequate seismic design means understanding of some basic principles and concepts that involve different actors, such as designers, manufacturers, installers, and directors of works. The current Italian Building Code, referred to as NTC18 hereinafter, defines each set of tasks and responsibilities in a sufficiently detailed manner, rendering now evident that achieving the desired performance level stems from a jointed contribution of all actors involved. Bearing in mind that seismic design is nothing else than proportioning properly seismic demand, in terms of acceleration and/or displacement, and the corresponding capacity, this paper gives a synthetic and informative overview on how to evaluate these two parameters. To shed some light on this, the concept of acceleration floor response spectrum (AFRS) is firstly brought in, along with basics of building structure-NSEs interaction, and is then deepened by means of calculation methods. Both the most rigorous method based on nonlinear dynamic simulations and the simplified analytical formulations provided by the NTC18 are briefly discussed and reviewed, trying to make them clearer even to readers with no structural/earthquake engineering background because, as a matter of fact, NSEs are often selected by architects and/or mechanical or electrical engineers. Lastly, a simple case study, representative of a European code-compliant five-storey masonry-infilled reinforced concrete frame building, is presented to examine differences between numerical and analytical AFRS and to quantify accuracy of different NTC18 procedures.

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“…The latter is a research field that gained increasing interest in the last years due to its important repercussion on the engineering practice (e.g. Menon and Magenes, 2011a-b;Sullivan et al, 2013;Calvi and Sullivan, 2014;Petrone et al, 2015;Vukobratović and Fajfar, 2016;Lucchini et al, 2017;Vukobratović and Fajfar, 2017;Surana et al, 2018;Degli Abbati et al, 2018;Merino et al, 2019;Di Domenico et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Validation of a practice-oriented floor spectra formulation through actual data from the 2016/2017 Central Italy earthquake

Abbati

Cattari

Lagomarsino

2022

Preprint

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Analytical expressions for the floor spectra evaluation play a key role for a correct definition of the seismic input induced to non-structural elements or local mechanisms in existing buildings. They have to be able to properly assess the possible amplification phenomena, but also to correctly describe the effects of nonlinearities due to structural damage. Due to the complexity of such phenomena, data on existing structures hit by earthquakes constitute a precious source for a better understanding of the topic and the validation of analytical expressions. In this framework, the paper aim is twofold. On one hand, it evaluates the entity of seismic amplification through experimental evidence from in-situ measurements on existing monitored structures. On the other hand, it presents the application of an analytical expression for the floor spectra already developed by the Authors to two unreinforced masonry (URM) buildings. The case-studies are the former Fabriano courthouse (Ancona, Italy) and the Pizzoli’s town hall (L’Aquila, Italy). They were both hit by the 2016/2017 earthquake in Central Italy and are permanently monitored by the Italian seismic monitoring system of the Italian Department of Civil Protection (DPC). With the aim of the validation, the paper shows the comparison between experimental and analytical floor spectra for various minor events and mainshocks of the Central Italy earthquake. Since the two case-studies exhibited different damage level (from slight to moderate, respectively), the comparison allowed to verify the reliability of the expression both in the pseudo-elastic and moderate nonlinear fields.

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Effect of URM infills on inelastic floor response of RC frame buildings

Cited by 25 publications

References 39 publications

Floor spectra for bare and infilled reinforced concrete frames designed according to Eurocodes

Floor spectra for bare and infilled reinforced concrete frames designed according to Eurocodes

Towards Seismic Design of Nonstructural Elements: Italian Code‐Compliant Acceleration Floor Response Spectra

Validation of a practice-oriented floor spectra formulation through actual data from the 2016/2017 Central Italy earthquake

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