Adaptive control of damaged structures by using smart tunable liquid column gas damper considering dynamic soil–structure interaction

2021 ◽  
pp. 136943322110369
Author(s):  
Fereidoun Amini ◽  
Nazanin Nazmdar Shahri
Keyword(s):  
Soil Structure ◽  
Liquid Column ◽  
Soil Structure Interaction ◽  
Earthquake Excitation ◽  
Structure Interaction ◽  
Passive Dampers ◽  
Liquid Column Dampers ◽  
Control Forces ◽  
Gas Damper ◽  
External Forces

Liquid column dampers are adjusted based on the characteristics of the host structure and the type of external forces. It is assumed in most studies that the structure is rigidly connected to the ground, and the characteristics of the structure are invariant during external excitations. The performance of passive dampers may lose, or structural displacements may be increased by changing these conditions. This study presented a new method to find the optimal control forces for structures equipped with smart tuned liquid column gas damper (TLCGDs), considering variable characteristics of the structure and the soil–structure interaction. The proposed method calculates the gas pressure inside the columns by regularly adjusting and updating the frequency and damping of the TLCGD. The unknown or changed soil–structure characteristics are estimated by a system identification method, and damper parameters are determined through an optimization algorithm. The method was tested on 3- 9- and 10-story shear buildings under harmonic and earthquake excitation. According to the results, the smart damper more effectively reduced the structural displacement.

scholarly journals Seismic Behaviour of High-rise Frame-core Tube Structures Considering Dynamic Soil-Structure Interaction

2022 ◽  
Author(s):  
Xiaofeng Zhang ◽  
Harry Far
Keyword(s):  
Soil Structure ◽  
Design Method ◽  
Lateral Displacement ◽  
Building Design ◽  
Soil Structure Interaction ◽  
Seismic Behaviour ◽  
Earthquake Excitation ◽  
Core Tube ◽  
Structure Interaction ◽  
High Rise

Abstract As the population grows and land prices rise, high-rise buildings are becoming more and more common and popular in urban cities. Traditional high-rise building design method generally assumes the structure is fixed at the base, because the influence of soil-structure interaction is considered to be beneficial to the response of structures under the earthquake excitation. However, recent earthquakes and studies indicated that SSI may exert detrimental effects on commonly used structural systems. In this study, a numerical soil-structure model is established in Abaqus software to explore the impacts of SSI on high-rise frame-core tube structures. The seismic response of frame-core tube structures with various structural heights, height-width ratios, foundation types and soil types is studied. The numerical simulation results including maximum lateral deflections, foundation rocking, inter-storey drifts and base shears of rigid and flexible base buildings are discussed and compared. The results reveal the lateral displacement and inter-storey drifts of the superstructure can be amplified when SSI is taking into account, while the base shears are not necessarily reduced. Increasing the stiffness of the foundation and the subsoil can generally increase the seismic demand of structures. It has been concluded that it is neither safe nor economical to consider only the beneficial effects of SSI or to ignore them in structural design practice.

Behaviour of Colliding Multi-Storey Buildings under Earthquake Excitation Considering Soil-Structure Interaction

2012 ◽  
Vol 166-169 ◽  
pp. 2283-2292
Author(s):  
Sayed Mahmoud ◽  
Ayman Abd-Elhameed ◽  
Robert Jankowski
Keyword(s):  
Soil Structure ◽  
Time History ◽  
Soil Structure Interaction ◽  
Force Model ◽  
Lumped Mass ◽  
Earthquake Excitation ◽  
Structure Interaction ◽  
Impact Forces ◽  
Supporting Soil ◽  
The Impact

This paper investigates the coupled effect of the supporting soil flexibility and pounding between neighbouring, insufficiently separated buildings under earthquake excitation. Two adjacent three-storey structures, modelled as inelastic lumped mass systems with different structural characteristics, have been considered in the study. The models have been excited using the time history of the Kobe earthquake of 1995. A nonlinear viscoelastic pounding force model has been employed in order to effectively capture the impact forces during collisions. A discrete element model has been incorporated to simulate the horizontal and rotational movements of the supporting soil. Numerical simulations have been performed using developed software based on the Matlab code. The variation in storeys peak displacements, peak accelerations and peak impact forces for various gap sizes is presented in the paper and comparisons are made with the results obtained for colliding buildings with fixed-base supports. The results of the study indicate that the incorporation of the soil-structure interaction decreases both storey peak displacements and peak impact forces during collisions, whereas increase the peak accelerations at each floor level.

scholarly journals Study on Dynamic Structure-Soil-Structure Interaction of Three Adjacent Tall Buildings Subjected to Seismic Loading

2019 ◽  
Vol 12 (1) ◽  
pp. 336
Author(s):  
Jinsong Gan ◽  
Peizhen Li ◽  
Qiang Liu
Keyword(s):  
Soil Structure ◽  
Structural Characteristics ◽  
Tall Buildings ◽  
Dynamic Structure ◽  
Soil Structure Interaction ◽  
Soil Behavior ◽  
Earthquake Excitation ◽  
Skeleton Curve ◽  
Structure Interaction ◽  
Adjacent Structures

The dynamic structure-soil-structure interaction (SSSI) involving three adjacent structures with pile-raft foundations arranged along the east-west direction in a viscoelastic half-space is numerically studied under earthquake excitation. The direction of earthquake excitation is perpendicular to the direction of the structural arrangement. In the simulation, the Davidenkov model of the soil skeleton curve is assumed for soil behavior, and the viscous-spring artificial boundary is adopted. In order to investigate the effects of SSSI, the clear distance between structures, structure types, structure heights, and the first natural periods of structures are considered, and a series of numerical simulations are conducted. The peak floor displacement and the peak inter-story shear force of structures are examined to determine the SSSI effects. Results show that SSSI effects change significantly with these factors. Furthermore, the structural seismic response could be increased or reduced as a result of SSSI, depending mainly on the structural characteristics, rather than the location of the structures. These results are significant for studying the effects of SSSI and the sustainable development of cities, especially for the seismic design of dense urban buildings.

Pushover Analysis of Buildings Considering Soil-Structure Interaction

2016 ◽  
Vol 857 ◽  
pp. 189-194 ◽  
Author(s):  
P.V. Joy ◽  
Bennet Kuriakose ◽  
Mini Mathew
Keyword(s):  
Seismic Design ◽  
Soil Structure ◽  
Pushover Analysis ◽  
Design Procedure ◽  
Structural Response ◽  
Soil Structure Interaction ◽  
Seismic Behaviour ◽  
Earthquake Excitation ◽  
Structure Interaction ◽  
Performance Based Seismic Design

Structural vulnerability of buildings to damage needs to be identified during the time of earthquake for reliable seismic design. Conventional linear elastic design methods cease to predict seismic damages in buildings. Pushover analysis is a popular displacement-based nonlinear structural analysis procedure employed to predict the seismic behaviour of structures. Generally, buildings are designed based on the assumption that they are fixed at their base, without considering the foundation as well as soil. But in reality, when a structure is subjected to an earthquake excitation, it interacts with the soil, influencing the structural response. In this study, a multi-bay building with different heights are modelled and analysed, duly considering Soil-Structure Interaction (SSI). The study can form foundation for rigorous performance-based seismic design procedure, considering the effect of soil beneath the structure.

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