Parametric study on earthquake induced pounding between adjacent buildings

Naserkhaki, Sadegh; Aziz, Farah Nora Aznieta Abdul; Pourmohammad, Hassan

doi:10.12989/sem.2012.43.4.503

Cited by 16 publications

(15 citation statements)

References 22 publications

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“…Furthermore, in the past earthquakes, it was observed that, generally for cases of adjacent buildings with same height, pounding location mainly took place at the top floors of the pounded buildings except for cases with relatively small gap distance, where pounding tended to take place at the middle or bottom floors (e.g. Naserkhaki et al 2013).…”

Section: Local Mechanism Associated With Structural Poundingmentioning

confidence: 99%

Fragility curves of masonry buildings in aggregate accounting for local mechanisms and site effects

Angiolilli

Brunelli

Cattari

2023

Bull Earthquake Eng

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The seismic evaluation of masonry buildings in aggregate, largely diffused within the existing Italian and European building stock, represents a difficult and open task that has not been exhaustively investigated so far. The study proposes a procedure aimed at evaluating the potential impact of the combination of local mechanisms and site-amplification in terms of fragility curves on an existing unreinforced masonry (URM) aggregate which is made of five adjacent structural units mutually interacting with each other during seismic sequences. The case study is inspired by built heritage of the historic centre of Visso struck by the Central Italy 2016/2017 earthquakes. The in-plane (IP) response of URM buildings was simulated through nonlinear dynamic analyses performed on a 3D equivalent frame model of the structure, whereas out-of-plane (OOP) mechanisms were analysed by adopting the rigid-block assumption but assuming, as seismic input, the floor accelerations derived from the post-processing of data derived from the global 3D model. An innovative procedure considering the pounding effect to the global response of the building is also presented. Two soil conditions were assumed with (freefield) and without (bedrock) site amplification. The results showed that site effects strongly affected the seismic vulnerability of the aggregate, also altering the combination between IP and OOP mechanisms. In fact, for bedrock condition, especially for medium–high damage levels, local mechanisms were prevailing with respect to the IP response. Conversely, for freefield condition, IP mainly governed the overall behaviour for all the damage levels, consistently with the field evidence.

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Section: Local Mechanism Associated With Structural Poundingmentioning

confidence: 99%

Fragility curves of masonry buildings in aggregate accounting for local mechanisms and site effects

Angiolilli

Brunelli

Cattari

2023

Bull Earthquake Eng

View full text Add to dashboard Cite

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“…Furthermore, in the past earthquakes, it was observed that, generally for cases of adjacent buildings with same height, pounding location mainly took place at the top oors of the pounded buildings except for cases with relatively small gap distance, where pounding tended to take place at the middle or bottom oors (e.g. Naserkhaki et al 2013).…”

Section: Local Mechanism Associated With Structural Poundingmentioning

confidence: 99%

Fragility curves of masonry buildings in aggregate accounting for local mechanisms and site effects

Angiolilli

Brunelli

Cattari

2022

Preprint

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Masonry buildings in aggregate are largely diffused within the existing Italian and European building stock, especially in historical centres. Their seismic evaluation represents a difficult and open task that has not been exhaustively investigated so far. The study proposes a procedure aimed at evaluating the potential impact of the combination of local mechanisms and site-amplification in terms of fragility curves on an existing masonry aggregate. The latter consists of five adjacent structural units mutually interacting with each other during seismic sequences. The aggregate is inspired by the unreinforced masonry (URM) built heritage of the historic centre of Visso struck by the Central Italy 2016/2017 earthquakes. It was proved to be negatively affected especially by the site-amplification phenomena. The in-plane (IP) response of URM buildings was simulated through nonlinear dynamic analyses performed on a 3D equivalent frame model of the structure, whereas out-of-plane (OOP) mechanisms were analysed by adopting the rigid-block assumption but assuming as seismic input the floor accelerations derived from the post-processing of data derived from the global 3D model. Also an innovative procedure considering the pounding effect to the global response of the building was presented. Two soil conditions were assumed with (freefield) and without (bedrock case) site amplification. In the first case, a site response analysis based on a 1D soil model aimed to reproduce the actual soil profile under the examined aggregate has been carried out. The results showed that site effects strongly affected the seismic vulnerability of the aggregate, also possibly altering the combination between IP and OOP mechanisms with respect to what expected on basis of evidence from other historical centres. More specifically, for bedrock condition, the overall seismic response of the buildings in aggregate was strongly affected by such a combination, especially for medium-high damage levels where local mechanisms were prevailing with respect to the IP response. Conversely, for freefield condition, IP mainly governed the overall behaviour for all the damage levels, consistently with the field evidence. The result appears also affected by the architectural configuration of such buildings, characterized by quite large openings at ground floor.

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“…This phenomenon, known as the structure-soil-structure interaction (SSSI), may also have a significant influence on the behavior of buildings close enough to pound during earthquakes (see, for example, Ghandil and Aldaikh, 2017;Li et al, 2017;Madani et al, 2015). Moreover, considering pounding together with the effects of soil was found to increase the displacements, shear forces, and impact forces in some studies (see Farghaly, 2017;Ghandil and Aldaikh, 2017;Kontoni and Farghaly, 2018;Li et al, 2017;Naserkhaki et al, 2012Naserkhaki et al, , 2013Naserkhaki et al, , 2014, whereas it was found to decrease these parameters in other investigations (see Elwardany et al, 2019;Mahmoud et al, 2013;Shakya et al, 2008;Shakya and Wijeyewickrema, 2009). These contradictory results can be attributed to the soil types and foundation types used in different analyses.…”

Section: Introductionmentioning

confidence: 99%

Seismic gap between buildings founded on different soil types experiencing pounding during earthquakes

Miari

Jankowski

2022

Earthquake Spectra

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Several formulas have been suggested in the literature to evaluate the minimum seismic gap that would prevent collisions between adjacent buildings during earthquakes, including those based on the absolute sum of the peak displacements (ABS), square root of the sum of the squares (SRSS), the double difference (DDC) method, Australian code, and approach proposed by Naderpour et al. The aim of the present study is to evaluate the influence of the seismic gap on the behavior of buildings experiencing pounding, as well as verify the accuracy of these five formulas for structures founded on different soil types. Three buildings (4-story, 6-story, and 8-story buildings) were considered and three pounding scenarios were modeled. In the first part of the study, these three pounding scenarios were analyzed by considering three different seismic gaps (1 mm, 1 cm, and 1 m). In the second part, the accuracy of the aforementioned formulas was verified for buildings founded on different soil types (hard rock, rock, very dense soil and soft rock, stiff soil, and soft clay soil). The results indicated that the seismic gap had a significant influence on the response of colliding buildings, including the peak story accelerations and pounding forces. Moreover, increasing the gap did not always lead to a reduction in the effects of pounding, unless it was large enough to eliminate structural collisions during earthquakes. In addition, all five formulas were found to provide poor estimates when considering different soil types. The ABS and the Naderpour et al. formulas were found to always be conservative, but they overestimated the minimum gap that would prevent pounding. Moreover, the DDC and Australian code formulas provided overestimate, accurate, and underestimate results, and the SRSS formula provided both accurate and overestimate results.

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Parametric study on earthquake induced pounding between adjacent buildings

Cited by 16 publications

References 22 publications

Fragility curves of masonry buildings in aggregate accounting for local mechanisms and site effects

Fragility curves of masonry buildings in aggregate accounting for local mechanisms and site effects

Fragility curves of masonry buildings in aggregate accounting for local mechanisms and site effects

Seismic gap between buildings founded on different soil types experiencing pounding during earthquakes

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