Influence of mass and contact surface on pounding response of RC structures

Khatiwada, Sushil; Larkin, Tam; Chouw, Nawawi

doi:10.12989/eas.2014.7.3.385

Cited by 11 publications

(2 citation statements)

References 21 publications

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“…Finally, it should be noted that, given the complexity of the pounding phenomenon, the formulations that are used to compute the impact stiffness and the damping coefficient for defining the pounding forces can be considered to be simplified models. For example, the formulations do not account for factors that may have an influence on the pounding forces such as the effect of damage concentration at the contact area, uncertainty about the geometry of the contact area, or uncertainty about the masses that contribute to the impact [79]. However, since previous research has shown that using different impact stiffness and damping coefficient values has a minor influence on the global response of the structure (e.g., see [19,73,77]), the referred formulations are expected to provide adequate values for the analyses that were performed.…”

Section: Modelling Of the Impact Forcesmentioning

confidence: 99%

Seismic Fragility Functions for Non-Seismically Designed RC Structures Considering Pounding Effects

Mohamed

Romão

2021

Buildings

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The proposed study develops fragility functions for non-seismically designed reinforced concrete structures considering different pounding configurations. The study addresses an existing research gap, since large-scale seismic risk assessment studies involving the seismic performance assessment of building portfolios usually do not involve fragility functions accounting for the possibility of pounding. The selected structures include configurations involving different separation distance values and exhibiting floor-to-floor pounding, floor-to-column pounding, pounding between structures with a significant height difference, and pounding between structures with a significant mass difference. The behaviour of these pounding configurations was analysed using incremental dynamic analysis and compared with that of the corresponding control cases (i.e., individual structures with no interaction with other structures). The results indicate the type of failure mechanism that contributes to the global collapse of the different configurations and the influence of the separation distance. Results highlight the main differences between the expected performance of different pounding configurations with respect to the occurrence of the failure mechanism that governs their collapse. Finally, results indicate that large-scale seismic risk assessment studies should consider fragility functions accounting for different pounding configurations when the possibility of pounding is not negligible, except in cases involving floor-to-floor pounding.

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Section: Modelling Of the Impact Forcesmentioning

confidence: 99%

Seismic Fragility Functions for Non-Seismically Designed RC Structures Considering Pounding Effects

Mohamed

Romão

2021

Buildings

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“…It was shown that the effect of the induced torsion on the structural response of the entire block is substantial due to the bi-directional seismic pounding because of the coupled building block system. Khatiwada et al [7] applied a parametric study of mass pendulums, relative velocities, and shape of contact surface on the restitution and acceleration. It was concluded that acceleration is not dependent on mass but on velocity, total participating mass, and the ratio of striker mass to struck block.…”

Section: Introductionmentioning

confidence: 99%

The combined effect of seismic-induced collision and soil stress irregularity on seismic response of adjacent high-rise buildings: Evaluation and mitigation

Ahmed

Farghaly²

2022

JES. Journal of Engineering Sciences

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Unequal distribution of stresses in soil underneath the foundations of adjacent buildings represents a great challenge in structural engineering, especially for buildings prone to earthquakes. Another serious problem facing earthquakeprone adjacent buildings is collision, which severely affects the behaviour of the buildings and changes the distribution of the soil stresses under the foundations of the buildings. This research investigates seismic responses of adjacent High-Rise Buildings (HRBs) exposed to seismic-induced pounding and impose irregular soil stress distribution considering the Soil-Structure Interaction (SSI) effect. For this purpose, numerical nonlinear dynamic analysis of three-dimensional models of adjacent four HRBs is conducted. To mitigate the exaggerated effect of seismic-induced collision and soil stress irregularity on the seismic response of the adjacent HRBs, three approaches are proposed; improving soil bearing capacity in the highly stressed zone, joining the adjacent HRBs by means of Fluid Viscous Links (FVLs), and combining the two previous approaches. Three-dimensional models of the adjacent 4HRBs group are studied under different earthquakes to examine the abovementioned three approaches. The combination approach shows promising results in moderating the collision effects; it considerably mitigates the pounding effects between the adjacent HRBs in terms of reducing straining actions and displacements of buildings as well as controlling stresses irregularity in soil under the foundations of such buildings .

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State-of-the-Art of Research on Seismic Pounding Between Buildings with Aligned Slabs

Kharazian

Almansa

2017

Arch Computat Methods Eng

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Collision between adjoining buildings with aligned slabs is relevant, since the huge impact forces significantly modify the buildings dynamic behavior. The separation required by the regulations avoids pounding; however, even in recent buildings, impact can occur due to not fulfillment of codes and seismicity underestimation. Given the importance of this issue, a significant research effort has been undertaken worldwide, and a considerable number of papers are available. The complexity of this field and this abundance of information might require a review task. This paper presents a summary of the theoretical developments, discusses the most common simulation software, provides an overview of the previous research, offers recommendations to researchers, and identifies research needs.

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Influence of mass and contact surface on pounding response of RC structures

Cited by 11 publications

References 21 publications

Seismic Fragility Functions for Non-Seismically Designed RC Structures Considering Pounding Effects

Seismic Fragility Functions for Non-Seismically Designed RC Structures Considering Pounding Effects

The combined effect of seismic-induced collision and soil stress irregularity on seismic response of adjacent high-rise buildings: Evaluation and mitigation

State-of-the-Art of Research on Seismic Pounding Between Buildings with Aligned Slabs

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