Damage assessment due to pounding between adjacent structures with equal and unequal heights

Chenna, Rajaram; Ramancharla, Pradeep Kumar

doi:10.1007/s13349-018-0296-1

Cited by 11 publications

(3 citation statements)

References 24 publications

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“…Over time, it is becoming more challenging to meet the serviceability requirements (i.e., maintain an adequate lateral deflection or control the extensive vibrations on tall structures) compared to meeting the strength and capacity requirements within a structure [28,[37][38][39]. Due to structural sway in tall buildings, lateral deflection can damage the non-structural elements (i.e., cladding and partition) and main structural components to the extent of damaging possible adjacent structures [34,40,41]. Large levels of deflection in tall structures can be mitigated appropriately through structural design measures or by introducing external deflectionmitigation systems (e.g., dampers) [13,[42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Formulation of Separation Distance to Mitigate Wind-Induced Pounding of Tall Buildings

Brown,

Alanani,

Elshaer

et al. 2024

Buildings

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Structures in proximity subjected to a substantial lateral load (e.g., wind and earthquakes) can lead to a significant hazard known as structural pounding. If not properly mitigated, such impacts can lead to local and global damage (i.e., structural failure). Mitigation approaches can include providing a suitable separation gap distance between structures, installing adequate shock absorbers, or designing the structure for the additional pounding impact loads. Wind-induced pounding of structures can be of higher risk to buildings due to large deflections developed during wind events. The current study develops various mathematical formulas to determine the suitable separation distance between structures in proximity to avoid pounding. The developed procedure relies first on wind-load evaluations using Large Eddy Simulation (LES) models. Then, the extracted wind loads from the LES are applied to finite element method models to determine the building deflections. Various building heights, wind velocities, and flexibility levels are examined to prepare a training database for developing the mathematical formulas. A genetic algorithm is utilised to correlate the required separation gap distance to the varying parameters of the tall buildings. It was found that more complex formulas can achieve better mapping to the training database.

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Section: Introductionmentioning

confidence: 99%

Formulation of Separation Distance to Mitigate Wind-Induced Pounding of Tall Buildings

Brown,

Alanani,

Elshaer

et al. 2024

Buildings

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“…While most studies have focused on buildings with equal storey heights, leading to diaphragm-to-diaphragm pounding, it is crucial to highlight that adjacent buildings exhibit varying storey heights, leading to diaphragm-to-column pounding in various cases. This type of pounding can substantially affect critical columns' responses, particularly regarding shear demand and ductility requirements [13,20,21]. Furthermore, a recent study showed the significant influence of infill panels, as these can significantly affect the responses of structures subjected to pounding during earthquakes [22].…”

Section: Introductionmentioning

confidence: 99%

Structural Pounding Effect on the Seismic Performance of a Multistorey Reinforced Concrete Frame Structure

et al. 2023

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During intense ground motion excitations, the pounding between adjacent buildings may result in extensive structural damage. Despite the provision of regulations regarding the minimum separation gap required to prevent structural collisions, the majority of existing structures are poorly separated. The modern seismic design and assessment of structures are based on the definition of acceptable response levels in relation to the intensity of seismic action, which is usually determined by an acceptable probability of exceedance. From this point of view, the seismic performance of a typical eight-storey reinforced concrete (RC) frame structure is evaluated in terms of pounding. In particular, the performance is evaluated using six different separation gap distances as a fraction of the EC8 minimum distance. As the height of the adjacent structure affected the required separation distance, the examined RC structure was assumed to interact with four idealized rigid structures of one to four storeys. The typical storey height was equal between the examined structures; therefore, collision could occur at the diaphragm level. To this end, incidental dynamic analyses (IDAs) were performed, and the fragility curves for different limit states were obtained for each case. Finally, the seismic fragility was combined with the hazard data to evaluate the seismic performance probabilistically.

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“…Some studies also indicate that the stiffer structure response is amplified in a high-frequency range of earthquakes, while the flexible structure response is amplified in the low-frequency range of earthquakes (Dimitrakopoulos et al 2009(Dimitrakopoulos et al ,2010. In fact, the vibration frequencies of adjacent structures and the frequency of ground motion play a key role in the seismic response of flexible or stiffer structural response (Chenna and Ramancharla 2018). Therefore, it is possible to predict the seismic response of flexible or stiffer adjacent structures having an appropriate frequency range.…”

Section: Introductionmentioning

confidence: 99%

Investigating the effects of structural pounding on the seismic performance of adjacent RC and steel MRFs

Kazemi

Miari

Jankowski

2020

Bull Earthquake Eng

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An insufficient separation distance between adjacent buildings is the main reason for structural pounding during severe earthquakes. The lateral load resistance system, fundamental natural period, mass, and stiffness are important factors having the influence on collisions between two adjacent structures. In this study, 3-, 5- and 9-story adjacent reinforced concrete and steel moment resisting frames (MRFs) were considered to investigate the collision effects and to determine modification factors for new and already existing buildings. For this purpose, incremental dynamic analysis was used to assess the seismic limit state capacity of the structures using a developed algorithm in OpenSees software including two near-field record subsets suggested by FEMA-P695. The results of this paper can help engineers to approximately estimate the performance levels of MRFs due to pounding phenomenon. The results confirm that collisions can lead to the changes in performance levels, which are difficult to be considered during the design process. In addition, the results of the analyses illustrate that providing a fluid viscous damper between adjacent reinforced concrete and steel structures can be effective to eliminate the sudden changes in the lateral force during collision. This approach can be successfully used for retrofitting adjacent structures with insufficient in-between separation distances.

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Damage assessment due to pounding between adjacent structures with equal and unequal heights

Cited by 11 publications

References 24 publications

Formulation of Separation Distance to Mitigate Wind-Induced Pounding of Tall Buildings

Formulation of Separation Distance to Mitigate Wind-Induced Pounding of Tall Buildings

Structural Pounding Effect on the Seismic Performance of a Multistorey Reinforced Concrete Frame Structure

Investigating the effects of structural pounding on the seismic performance of adjacent RC and steel MRFs

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