Dynamic Behaviour of Tall Building Soil-Structure Interaction

2009 ◽  
Author(s):  
M. Tehranizadeh
Keyword(s):  
Soil Structure ◽  
Dynamic Behaviour ◽  
Tall Building ◽  
Soil Structure Interaction ◽  
Structure Interaction

Importance of seismic site response and soil–structure interaction in dynamic behaviour of a tall building

Géotechnique ◽  
2015 ◽  
Vol 65 (5) ◽  
pp. 391-400 ◽  
Author(s):  
E. Bilotta ◽  
L.De Sanctis ◽  
R. Di Laora ◽  
A. D'Onofrio ◽  
F. Silvestri
Keyword(s):  
Soil Structure ◽  
Dynamic Behaviour ◽  
Site Response ◽  
Tall Building ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Seismic Site Response

A numerical study on the influences of underlying soil and backfill characteristics on the dynamic behaviour of typical integral bridges

Bauingenieur ◽  
2020 ◽  
Vol 95 (11) ◽  
pp. S 2-S 11
Author(s):  
H. D. B. Aji ◽  
M. B. Basnet ◽  
Frank Wuttke
Keyword(s):  
Soil Structure ◽  
Dynamic Behaviour ◽  
Numerical Study ◽  
Coupled System ◽  
Soil Structure Interaction ◽  
Dynamic Resistance ◽  
Soil Characteristic ◽  
Structure Interaction ◽  
Integral Bridges ◽  
Underlying Soil

Abstract The identification of the dynamic behaviour of a structure is one of the crucial steps in the design of the dynamic resistance of the structure. The dynamic behaviour is represented by the natural frequencies and damping which are subsequently used along with the considered dynamic actions in the design process. In regard of integral bridge concept, one of the consequences of the omission of joints and bearings is the substantial soil-structure interaction which in turn increases the sensitivity of the dynamic behaviour of the bridges to the surrounding soil characteristic. In this article, we extended our hybrid BEM-FEM steady-state dynamic numerical tool to the 3D regime, developed by utilizing an in-house BEM and the commercial FEM software ABAQUS and use it to analyse the dynamic interaction between the bridge and the underlying soil as well as the backfill. The numerical results from four typical integral bridges show that underlying soil characteristic has great effect on the resonant frequencies and the damping. The backfill material properties tend to have less significant role due to the abutment wingwalls dominating the force transfer between the soil and the superstructure. The results also show that the degree of influence of the soil-structure interaction on the coupled system is affected by the type of load pattern in addition to the flexural stiffness of the superstructure.

Effect of foundation flexibility on seismic response of reinforced concrete TV-towers

2001 ◽  
Vol 28 (3) ◽  
pp. 465-481 ◽  
Author(s):  
Amir M Halabian ◽  
M Hesham El Naggar
Keyword(s):  
Reinforced Concrete ◽  
Soil Structure ◽  
Dynamic Behaviour ◽  
Bending Moment ◽  
Soil Structure Interaction ◽  
Earthquake Ground Motion ◽  
Element Formulation ◽  
Base Shear ◽  
Deep Foundation ◽  
Structure Interaction

The analysis of tall reinforced concrete TV-towers is commonly simplified by assuming a fixed base and ignoring the effect of soil–structure interaction. However, the foundation flexibility affects the dynamic characteristics of tall structures and influences their dynamic behaviour. To design these towers for dynamic loading, the fundamental natural periods, base bending moment, and base shear force as the most important parameters are needed and must be evaluated properly. In the current study, a finite element formulation for the response analysis of TV-towers subjected to earthquake ground motion accounting for soil–structure interaction is presented. The effects of foundation flexibility on the dynamic behaviour of TV-towers were evaluated for two different types of foundation, shallow footing and deep foundation, and various soil profiles. A typical example for these towers is analysed and the results for a range of soil dynamic parameters are presented. It was found that the foundation flexibility increases the natural periods, alters the natural mode shapes, and decreases the base bending moment. It was also concluded that the effect of soil–structure interaction may have a large effect on the base shear of the tower and should be considered in the analysis, especially for the design of horizontal reinforcement.Key words: soil–structure interaction, TV-towers, natural period, base forces, foundation flexibility.

Seismic Control of High-Rise Buildings Equipped with ATMD Including Soil-Structure Interaction Effects

2018 ◽  
Vol 12 (03) ◽  
pp. 1850010 ◽  
Author(s):  
Mohammad Shahi ◽  
Mohammad Reza Sohrabi ◽  
Sadegh Etedali
Keyword(s):  
Optimum Design ◽  
Ground State ◽  
Seismic Behavior ◽  
Soil Structure ◽  
Tall Building ◽  
Soil Structure Interaction ◽  
Rigid Base ◽  
Control Force ◽  
Structure Interaction ◽  
Lqr Controller

The seismic behavior of the structures equipped with ATMD is often investigated based on the rigid base assumption without considering soil-structure interaction (SSI) effects. The SSI effects significantly modify the dynamic characteristics of the structures, while these changes may be ignored in the design process of the controllers. The present paper aims to address the issue of the SSI effects on the seismic behavior of the structures and performance of the adopted controllers. For this purpose, a mathematical model is developed for the time domain analysis of tall building equipped with ATMD including SSI effects. Considering the fixed base case and three types of ground states, namely soft, medium and dense soil, the numerical studies are carried out on a 40-story structure subjected to different earthquake excitations. Two well-known controllers, proportional-integral-derivative (PID) and linear-quadratic regulator (LQR) controllers, are employed for tuning control force of ATMD in different conditions of ground state. A particle swarm optimization (PSO) algorithm is used for the optimum design of Tuned mass damper (TMD) parameter and the gain matrices of the controllers in both cases without and with SSI effects. It is found that TMDs are more effective for the higher soil stiffness and their efficiencies are degraded in soft soils. Furthermore, the SSI significantly affects on the optimum design of the PID and LQR controllers. The adopted controllers are significantly able to mitigate the peak top floor displacement of the tall building. In addition that the PID controller is a simple strategy with design variables much less than LQR controller, it performs better than the LQR controller in most earthquakes for different conditions of ground state. The performance of the controllers decreases with increasing soil softness, so that ignoring the SSI effects may result in incorrect and unrealistic results of the seismic behavior of the structures.

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