Expected extreme value of pounding force between two adjacent buildings

Rahimi, Sepideh; Soltani, Mohammad Reza

doi:10.12989/sem.2017.61.2.183

Cited by 4 publications

(3 citation statements)

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“…Numerical analysis involving time-history used the Ritz modal loading analysis [65] to measure lateral deflection and acceleration. Ritz vectors typically capture more response when compared with the same number of Eigen vectors, Mode numbers were selected targeting dynamics check modal participating mass ratios.…”

Section: Numerical Analysismentioning

confidence: 99%

A Mathematical Approach for Predicting Sufficient Separation Gap between Adjacent Buildings to Avoid Earthquake-Induced Pounding

Jaradat,

Far,

Mortazavi

2023

Civ Eng J

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Studies on earthquake-related damage underscore that buildings are vulnerable to significant harm or even collapse during moderate to strong ground motions. Of particular concern is seismic-induced pounding, observed in numerous past and recent earthquakes, often resulting from inadequate separation gaps between neighboring structures. This study conducted an experimental and numerical investigation to develop a mathematical equation to calculate a sufficient separation gap in order to avoid the collision between adjacent mid-rise steel-frame buildings during seismic excitation. In this study, the coupled configuration of 15-storey & 10-storey, 15-storey & 5-storey, and 10-storey & 5-storey steel frame structures was considered in the investigation. The investigation concluded with a large number of data outputs. The outputs were used to predict structural behavior during earthquakes. The obtained data were categorized into three main categories according to the earthquake's Peak Ground Acceleration (PGA) levels. Also, the derived equations were divided into three different equations to estimate the required seismic gap between neighboring buildings accordingly. The derived equations are distilled to empower engineers to rigorously evaluate non-irregular mid-rise steel frame buildings. Doi: 10.28991/CEJ-2023-09-10-02 Full Text: PDF

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Section: Numerical Analysismentioning

confidence: 99%

A Mathematical Approach for Predicting Sufficient Separation Gap between Adjacent Buildings to Avoid Earthquake-Induced Pounding

Jaradat,

Far,

Mortazavi

2023

Civ Eng J

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“…Several studies have shown that impact stiffness k has a great bearing on the pounding response, particularly on the inertia force response and the structural acceleration response, though the researchers have proposed various methods and equations to compute the stiffness of the impact element model [26,[42][43][44][45][46]. The decision to employ impact stiffness when examining structural pounding is difficult as it necessitates taking into account the uncertainties in the shapes of the impact surfaces, the material properties when subjected to impact loads, the fluctuating impact velocities, and additional factors.…”

Section: Introductionmentioning

confidence: 99%

Impact Stiffness of Linear Viscoelastic Model for Seismic Pounding Simulation: An Experimental Evaluation

Jaradat

Far

2023

Civ Eng J

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Pounding between adjacent structures occurs when the separating distance within the two buildings is inadequate to contain the movement between them during an earthquake event. Seismic pounding can lead to significant harm or even the destruction of neighbouring structures. In creating a model for structural response, impact stiffness is considered as a critical factor in calculating the impact force throughout the collision within adjacent structures. It is important to derive realistic stiffness values when performing a numerical simulation of pounding forces within abutting structures to attain valid results. The objective of this study is to ascertain the impact stiffness within the linear viscoelastic contact model, using data obtained from shaking table experiments of pounding between neighboring five-storey and 15-storey single-bay model of steel-frame. The steel models were subjected to scaled ground acceleration records, two far-field and two near-field. The study’s findings indicate that there is a significant discrepancy between the theoretical impact parameters and the measured experimental value because the assumptions made to derive the theoretical formulas do not align with the actual impact conditions. The accuracy and precision of the experimental formula adopted in this study have been validated in comparison with the numerical results. Doi: 10.28991/CEJ-2023-09-06-01 Full Text: PDF

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“…But it will suffer if the height of the short building is increased, and the most critical pounding scenario is when the shorter building's height is half of the height of the taller one, which demands increasing the separation gap. Rahimi and Soltanim [19] proposed an analytical approach for the pounding of adjacent buildings and showed that the proposed approach can significantly save computational costs by obviating the need for performing dynamic analysis. Shehata E. A. et al [20] compared the seismic response of structures with shallow raft base lying on soft soil with fixed support conditions.…”

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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Expected extreme value of pounding force between two adjacent buildings

Cited by 4 publications

References 0 publications

A Mathematical Approach for Predicting Sufficient Separation Gap between Adjacent Buildings to Avoid Earthquake-Induced Pounding

A Mathematical Approach for Predicting Sufficient Separation Gap between Adjacent Buildings to Avoid Earthquake-Induced Pounding

Impact Stiffness of Linear Viscoelastic Model for Seismic Pounding Simulation: An Experimental Evaluation

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

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