Effects of soil-structure interaction in seismic analysis of buildings with multiple pressurized tuned liquid column dampers

Abstract

In this paper soil-structure interaction (SSI) effects are investigated while an array of Pressurized Tuned Liquid Column Dampers (PTLCD) is employed for seismic vibration control of buildings. This device represents the most general case of a passive damper, with different reduction options to other control devices obtained by simplifying the involved parameters. Soil conditions considerably affect the control device functioning, because dynamic parameters such as natural frequency, damping factor, and natural modes depend on the soil properties. A simplified mathematical model is developed for the building with multiple degrees of freedom connected to a flexible base. For the time-domain analysis, a computational routine is developed for the linearization of the equilibrium equations of the PTLCD, as well as details for the reduction to the other types of passive dampers. Several numerical examples are selected for the analysis of the damper efficiency in reducing seismic vibration considering SSI. These simulations include Kobe earthquake data, which is applied to the model to evaluate the device performance under different scenarios. It is verified the influence of SSI in the natural frequency and structural response, which is related to the earthquake frequency components. Results confirm that the array of PTLCD's can reduce the vibration amplitudes, being more effective for soils with higher stiffness values.

Calculating the Dynamic Impedances of Foundations and their Effect on the Seismic Response of Structures: Analytical and Numerical Study

“…Where,  and  are two damping coefficients that can be calculated based on the coefficient, the first mode fundamental frequency 1  , and the last mode n  [30].…”

Optimal design of pendulum-tuned mass damper for the vibration control of offshore wind turbines with a flexible monopile foundation

“…Several articles formulate an analytical or semi-analytical solution to describe the dynamic behavior of monopile OWT [3,[7][8][9][10][11] and onshore wind turbine [12]. By a structural dynamic approach, soilstructure modeling is done often by (i) discrete spring, (ii) apparent fixity method, and (iii) distributive springs (for instance, API p-y curves) [8,13,14], but there are other more complex approaches [15]. The principal uncertainty of monopile OWT is the soil-structure modeling, due to its complexity [16], the scale difference of maritime piles [17], or the soil response to dynamic/cyclic loads [18].…”

A study of TLCD parameters for structural vibration mitigation

“…Specifically, the main dynamic load considered in these structures is due to the wind. Just like the random action of the wind, efforts have been applied to the dynamic analysis of structures with TLCD for the control of earthquake vibrations (Gosh and Basu, 2005;Chakraborty et al, 2012;Mendes et al, 2019;Espinoza et al, 2018). For a better performance of the damper, (Gosh and Basu, 2004;Sonmez et al, 2016) propose a different composition, in which the TLCD is connected to the primary structure using an adaptive spring.…”