scholarly journals Verification of Formulas for Periods of Adjacent Buildings Used to Assess Minimum Separation Gap Preventing Structural Pounding during Earthquakes

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
S. M. Khatami ◽  
H. Naderpour ◽  
R. C. Barros ◽  
R. Jankowski
Keyword(s):  
Numerical Analysis ◽  
Separation Distance ◽  
Seismic Gap ◽  
Structural Pounding ◽  
Large Separation ◽  
Adjacent Buildings ◽  
Linear And Nonlinear ◽  
Minimum Separation ◽  
New Equation

Insufficient separation distance between adjacent buildings may lead to serious damages during earthquakes due to structural pounding. The best way to prevent collisions is to provide sufficiently large separation distance between structures. In this paper, the periods of two closely spaced linear and nonlinear buildings have been investigated so as to accurately assess the minimum in-between separation gap. A new equation to calculate the effective periods of inelastic buildings has been proposed, and its effectiveness has been verified through numerical analysis. The results of the investigation conducted for inelastic buildings with different number of stories indicate that the proposed formula allows us to prevent earthquake-induced structural pounding by ensuring an adequate value of seismic gap.

scholarly journals Effect of passive coupling on seismic interaction optimization of adjacent structures

2021 ◽  
Vol 25 (1) ◽  
pp. 99-110
Author(s):  
Khadidja Reteri ◽  
Abdellatif Megnounif
Keyword(s):  
Numerical Study ◽  
Separation Distance ◽  
Flexible Structure ◽  
Seismic Events ◽  
Rigid Structure ◽  
The Past ◽  
Adjacent Buildings ◽  
Coupling System ◽  
Adjacent Structures ◽  
Minimum Separation

Abstract During the past few years, several studies have been conducted in various fields of civil engineering in order to design structures that can withstand the forces and deformations that might occur during seismic events. However, more recently, building adjacent structures close to each other and more resistant to earthquakes, provided with coupling systems, has been an issue of major concern. The effects of some parameters, such as the characteristics of adjacent structures and those of the coupling system, on the choice of the separation distance, were investigated using a program that was developed using MATLAB. This article aims to present a study that is intended to determine the parameters characterizing the coupling system. Moreover, the influence of rigidity of the structure was also examined. For this, three examples were investigated: a flexible structure, a rigid structure, and a very rigid structure. The results obtained from the numerical study made it possible to show that knowing the characteristics, number, and arrangements of the coupling systems can be used to find the minimum separation distance between two adjacent buildings.

scholarly journals Study on Earthquake-induced Structural Pounding Between Two Adjacent Building Structures with Unequal Heights

2021 ◽  
Vol 20 ◽  
pp. 196-208
Author(s):  
Pedro Folhento ◽  
Rui Carneiro De Barros ◽  
Manuel Braz-César
Keyword(s):  
Dynamic Behavior ◽  
Significant Influence ◽  
Dynamic Properties ◽  
Ground Motions ◽  
Separation Distance ◽  
Building Structures ◽  
Structural Pounding ◽  
Large Cities ◽  
Adjacent Buildings ◽  
Adjacent Building

Structural pounding has been found to have a significant influence on the dynamic behavior of building structures under earthquake excitations. This phenomenon is more probable when the buildings have insufficient separation distance and substantial different dynamic properties. In large cities, it is more common for adjacent buildings to have unequal heights, leading to different demands in the structures’ stories under earthquake-induced pounding. Hence, in this study five different buildings’ configurations with equal or unequal heights and subjected to different ground motions are considered, to study how pounding influences the dynamic behavior of the involved structures. It was found, among other results, that the peak responses tend to suffer amplifications at the stories of the taller building above the height of the shorter building.

scholarly journals Seismic Response Analysis of Fully Base-Isolated Adjacent Buildings with Segregated Foundations

2018 ◽  
Vol 2018 ◽  
pp. 1-21 ◽  
Author(s):  
Khaled Ghaedi ◽  
Zainah Ibrahim ◽  
Mohammed Jameel ◽  
Ahad Javanmardi ◽  
Hamed Khatibi
Keyword(s):  
Base Isolation ◽  
Separation Distance ◽  
Response Analysis ◽  
Seismic Gap ◽  
Base Shear ◽  
Earthquake Excitation ◽  
Isolation System ◽  
Adjacent Buildings ◽  
Construction Methods ◽  
Base Isolation System

In populous cities, construction of multistorey buildings close to each other due to space limitation and increased land cost is a dire need. Such construction methods arise several problems during earthquake excitation. The aim of this study is to investigate the bidirectional seismic responses of fully base-isolated (FBI) adjacent buildings having different heights and segregated foundations. Therefore, two scenarios, namely, (a) investigation of the responses of FBI adjacent buildings compared to those with fixed base (FFB) and (b) the effects of separation distance on FBI adjacent buildings, were studied. Based on these investigations, the results showed that isolation system significantly enhances the overall responses of the BI buildings. Spectacularly, the base isolation system was further efficient to decrease displacement rather than the acceleration. In addition, increase of the seismic gap changed the acceleration, pounding, base shear, base moment, and storey drift, as well as the force-deformation performance of the isolators. Therefore, it seems a need to focus on the effect of the separation distances for the design of base isolators for FBI adjacent buildings in future works.

scholarly journals Mitigating the seismic pounding of multi-story buildings in series using linear and nonlinear fluid viscous dampers

2021 ◽  
Vol 21 (4) ◽  
Author(s):  
Hytham Elwardany ◽  
Robert Jankowski ◽  
Ayman Seleemah
Keyword(s):  
Substantial Improvement ◽  
Point Of View ◽  
Steel Buildings ◽  
Viscous Dampers ◽  
Element Analysis ◽  
Fluid Viscous Dampers ◽  
Adjacent Buildings ◽  
In Series ◽  
Linear And Nonlinear ◽  
Nonlinear Fluid

AbstractSeismic-induced pounding between adjacent buildings may have serious consequences, ranging from minor damage up to total collapse. Therefore, researchers try to mitigate the pounding problem using different methods, such as coupling the adjacent buildings with stiff beams, connecting them using viscoelastic links, and installing damping devices in each building individually. In the current paper, the effect of using linear and nonlinear fluid viscous dampers to mitigate the mutual pounding between a series of structures is investigated. Nonlinear finite-element analysis of a series of adjacent steel buildings equipped with damping devices was conducted. Contact surfaces with both contactor and target were used to model the mutual pounding. The results indicate that the use of linear or nonlinear dampers leads to the significant reduction in the response of adjacent buildings in series. Moreover, the substantial improvement of the performance of buildings has been observed for almost all stories. From the design point of view, it is concluded that dampers implemented in adjacent buildings should be designed to resist maximum force of 6.20 or 1.90 times the design independent force in the case of using linear or nonlinear fluid viscous dampers, respectively. Also, designers should pay attention to the design of the structural elements surrounding dampers, because considerable forces due to pounding may occur in the dampers at the maximum displaced position of the structure.

Determination of the Interference Distance Between Two Objects Using Optimization Techniques

1994 ◽  
Author(s):  
Meyer Nahon
Keyword(s):  
Optimization Problem ◽  
Accurate Determination ◽  
Separation Distance ◽  
Optimization Techniques ◽  
Robotic Systems ◽  
Separation Problem ◽  
Optimization Formulation ◽  
Minimum Separation ◽  
Two Bodies

Abstract The determination of the interference distance between objects is a problem encountered in the off-line simulation of robotic systems. It is similar to the problem of finding the minimum separation distance between two bodies — a problem which, at present, is commonly solved using optimization techniques. This paper presents an analogous optimization formulation for the quick and accurate determination of the interference distance between two interfering objects. The optimization problem consists of finding the maximum amount by which the boundaries of two interfering object can be moved back while still maintaining a non-empty interference volume. Since the approach used is similar to that used in the minimum separation problem, a single algorithm has been implemented which, given the position and orientation of two objects, will return the separation or interference distance between the objects, as appropriate.

scholarly journals Optical Conveyor Belts for Chiral Discrimination: Influence of De-Phasing Parameter

2019 ◽  
Vol 9 (7) ◽  
pp. 1304
Author(s):  
Luis Carretero ◽  
Pablo Acebal ◽  
Salvador Blaya
Keyword(s):  
Numerical Analysis ◽  
Gaussian Beam ◽  
Enantiomeric Separation ◽  
Conveyor Belt ◽  
Separation Distance ◽  
Chiral Discrimination ◽  
Optimum Range ◽  
Conveyor Belts ◽  
Range Of Values ◽  
Maximum Separation

A numerical analysis is carried out of the influence of the de-phasing parameter of anoptical conveyor belt in the enantiomeric separation. The optical conveyor belt is obtained by theinterference of a Laguerre Gaussian and a Gaussian beam with different beam waists, which aretemporally de-phased. In order to obtain the maximum separation distance between enantiomers,we calculate the optimum range of values of the de-phasing parameter.

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