Pounding between adjacent buildings of varying height coupled through soil

Naserkhaki, Sadegh; El‐Rich, Marwan; Aziz, Farah Nora Aznieta Abdul; Pourmohammad, Hassan

doi:10.12989/sem.2014.52.3.573

Cited by 18 publications

(12 citation statements)

References 33 publications

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“…However, the response of the structure exposed to seismic excitations can be substantially influenced by SSI, especially for soft soils (Far, 2019;Kamgar et al, 2021). Recent studies confirm that the SSI (Naserkhaki et al, 2014) and the soil-pile-structure interaction (Fatahi et al, 2018) have a significant effect on the response of buildings experiencing pounding. This is referred to as the flexibility of the base induced by the soil, which leads to a decrease in the natural frequency of vibrating buildings (Stewart et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Miari

Jankowski

2022

Earthquake Spectra

View full text Add to dashboard Cite

show abstract

“…In most of the studies that were focused on earthquake-induced pounding, fixed based buildings were considered. However, the soil-structure interaction (SSI) and the soil-pile-structure interaction may have a significant effect on the response of colliding buildings (Korzec and Jankowski 2021;Fatahi et al 2018;Naserkhaki et al 2014;Kamgar et al 2021). This is due to the fact that the SSI reduces the natural frequency of buildings due to the flexibility induced by the soil/base (Stewart et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Analysis of floor-to-column pounding of buildings founded on different soil types

Miari

Jankowski

2022

Bull Earthquake Eng

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The aim of this study is to investigate the effect of the soil type on buildings experiencing floor-to-column pounding during earthquakes. Five buildings with 4-storeys, 6-storeys, and 7-storeys were considered. Three types of the 4-storey building with different total heights were taken into account which leads to floor-to-column pounding at 1/3, 1/2 and 2/3 of the height of the impacted column. Two pounding scenarios were considered, i.e. pounding between the 4-storey and 6-storey buildings (three cases when collisions occur at 1/3, 1/2 and 2/3 of the height of the impacted column) and pounding between the 4-storey and 7-storey buildings (three cases when collisions occur at 1/3, 1/2 and 2/3 of the height of the impacted column). In the first part of this study, the shear demands of the columns at the contact area were studied and compared with the no pounding case to investigate the effect of the floor-to-column pounding. Then, the shear demands of the columns at the contact area were studied for buildings founded on different soil types to investigate the effect of the soil type on the structural response. The results of this study illustrate that the shear demands of the impacted column significantly increase due to collisions and it exceeds the shear strength in all cases. Moreover, impacted column experiences higher shear demands for buildings founded on the soft clay soil, then for buildings founded on the stiff soil, then for buildings founded on very dense soil and soft rock, and finally for buildings founded on the rock and hard rock.

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“…Moreover, the earthquake-induced inter-storey pounding between adjacent structures is also recognized by the modern seismic codes (including Eurocode-8) as the most crucial case of interaction for the integrity of the structural stability. However, although the problem of earthquake induced pounding between adjacent buildings has received substantial attention over the last two to three decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] most of the studies have been focused on modeling the floor to floor collision. Furthermore, the majority of the studies have yielded conclusions not directly applicable for the design or the assessment of multi-storey buildings potentially under pounding.…”

Section: Introductionmentioning

confidence: 99%

Interaction of adjacent multi-storey RC frames at significant damage and near collapse limit states

Favvata¹

2015

WIT Transactions on the Built Environment

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The interaction problem between adjacent multi-storey reinforced concrete structures with unequal storey levels and different total heights at different limit states for three intensity levels of seismic hazard is evaluated. The seismic performance of the external column of the tall building that suffers the impact from the upper floor slab of the adjacent shorter structure is under consideration. The critical column's local requirements are checked at three different seismic demands according to the Eurocode 8 -part 3: (a) demand for damage limitation limit state (b) demand for significant damage limit state and (c) demand for near collapse limit state. More than 252 nonlinear dynamic step by step analyses have been performed. The results indicate that the column that suffers the impact appears to be in a critical condition due to high ductility demands when the limit state for the assessment is increased from damage limitation to significant damage and to near collapse state. As expected, the column that suffers the hit is always in a critical condition due to shear action. The limit state that is adopted for the evaluation of the pounding effect on the maximum shear requirements of the column slightly altered the results. However, the level of the seismic intensity influences the number of times the shear demands of the column exceed the available strength during the analysis. An increase of the developing requirements for inter-storey drift is also observed in all the cases where the seismic intensity is increased and the limit state becomes more exigent. The minimum gap distance between the adjacent structures that is required in order to eliminate the shear demands of the column seems to be depended on the limit state and the level of the seismic hazard that is used for the evaluation.

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Pounding between adjacent buildings of varying height coupled through soil

Cited by 18 publications

References 33 publications

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

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

Analysis of floor-to-column pounding of buildings founded on different soil types

Interaction of adjacent multi-storey RC frames at significant damage and near collapse limit states

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