Effect of friction damper on seismic response of structure considering soil-structure interaction

Heimann, Philip; Nagler, Bob; Lee, Hae Ja; Galtier, E.; Arnold, Brice; Xing, Z.

doi:10.14256/jce.1982.2017

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Therefore, in this study, the damping ratio is estimated using the Half-Power Bandwidth as shown in Eq. ( 5) [22].…”

Section: Foundation Dampingmentioning

confidence: 99%

Dynamic Earthquake Response of 3-DOF Structure with Substructures by Centrifuge Test

2024

Teh. vjesn.

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In recent years, strong earthquakes have caused a lot of damage around the world. In order to prevent such damage, proper evaluation of the seismic performance of buildings is absolutely necessary. However, the current analysis procedure in seismic design assumes fixed boundary conditions for the foundation and neglects the influence of the substructure on the superstructure. Previous studies have shown that the type of foundation affects structural responses during earthquakes. However, most of these studies have focused on single-degree-of-freedom (SDOF) structures and have not considered variations in response according to different substructure types. This study aims to investigate the effects of different substructures on ground motion and corresponding responses of the superstructure. Centrifugal simulations were conducted on a multi-degree-of-freedom (MDOF) superstructure, including a Half-embedded with Pile foundation, a fixed deep basement, and a Shallow foundation. The experimental results indicate that in the case of a half-substructure with a pile foundation, there was no significant difference between free field motion and foundation motion due to the pile foundation. However, in the case of a fixed deep basement, the embedment effect was most pronounced, especially in the short period range of 0.1 s to 0.5 s in the response spectrum. This resulted in a notable reduction in the spectrum. The analysis of the response spectra of foundation motion and free field motion revealed that the reduction effect was absent in the half-embedded with a pile foundation, but it was prominent in the fixed deep basement. Notably, the ratio of response spectrum increased in the fundamental period of the substructure. In the case of a shallow foundation, it was observed that foundation motion experienced larger amplification compared to free field motion. Shallow foundations have a relatively low stiffness of the substructure and are influenced by the inertial forces of the superstructure. Additionally, this tendency is believed to be more prominent due to the imperfectly fixed boundary conditions of shallow foundations to the ground. However, apart from the increase in foundation motion, the response of the superstructure was not proportional to it. These results contribute to a better understanding of the changes in seismic load and the response of multi-degree-of-freedom superstructures according to the type of substructure. The seismic design of the superstructure is safer and more reasonable when considering the effects of the type of substructure.

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“…Therefore, in this study, the damping ratio is estimated using the Half-Power Bandwidth as shown in Eq. ( 5) [22].…”

Section: Foundation Dampingmentioning

confidence: 99%

Dynamic Earthquake Response of 3-DOF Structure with Substructures by Centrifuge Test

2024

Teh. vjesn.

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“…The different structural configurations, impact models, analyses, and assumptions considered in these studies have indicated that structural pounding amplifies structural responses. Another exaggerating factor is the soil effect, which involves the sliding, rotation, and settlement of foundations during earthquakes [13][14][15][16][17][18][19][20][21]. The assumption of a fixed base that neglects the soil effect is sufficient for structures with low structural rigidity, in which the displacement of the superstructure is more important than that of the foundation.…”

Section: Introductionmentioning

confidence: 99%

Effect of soil on the capacity of viscous dampers between adjacent buildings

2023

JCE

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This study investigated the seismic pounding of two adjacent buildings considering soil–structure interaction (SSI). A comprehensive parametric study of buildings with different heights was performed to reveal the pounding-involved behaviour considering the soil effect. Wavelet transform has been conducted to gain insight into the differences in the frequency contents of the impact forces between fixed- and flexible-base adjacent structures. Linear viscous dampers (LVDs) between adjacent floors were used as pounding protection measures. The required supplemental damping ratio of the LVDs was determined through optimisation analysis under different soil types to verify the effect of the SSI on structural damping. Comparative results with and without SSI showed that incorporating the SSI worsens the pounding-involved responses during earthquakes.

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“…Structural scientists focused on strengthening structures, as well as the optimal design of buildings under earthquakes loads. The design of new buildings, including seismic restraint systems, is one of the new structural topics in recent decades (Nizic & Mestrovic, 2011;Majd et al, 2019;Sanghai & Pawade, 2020). These systems only act against various seismic vibrations without withstanding any static loads.…”

Section: Introductionmentioning

confidence: 99%

A Combined Analytical Method for Intelligent Control of Friction Damped Structures

Gharra¹,

Khanlari²,

Marnani³

2021

JST

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Controlling structures and increasing the prognosis of their behaviour before natural disasters are the most critical issues in structural engineering. To that end, predicting the destructive effects of earthquakes on both acceleration and displacement of structures would be beneficial. This paper suggests an intelligent control system that realises simultaneous control of acceleration and displacement parameters. There are two modules in the system. First, the preserving module aims to estimate the crisis thresholds of acceleration and displacement based on the historical seismic data of each area. Second, the processing module finds the optimum value of the slip load of the friction damper so that both acceleration and displacement are controlled. We introduce an analytical method based on a matrix analysis approach and heuristic algorithm (MAHA) as a core of the processing module. MAHA would analyse the structure response, and the friction damper would determine the optimum slip load. The numerical and software simulation results for various one-bay and two-bay steel structures show that the proposed intelligent control system applies to multiple frictions damped structures under different earthquake records. In addition, a control level of 80% in acceleration and displacement of structures is achieved compared to an uncontrolled state. Moreover, the mentioned system enables the engineers to find appropriate friction dampers during the design of structures.

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Effect of friction damper on seismic response of structure considering soil-structure interaction

Cited by 3 publications

References 9 publications

Dynamic Earthquake Response of 3-DOF Structure with Substructures by Centrifuge Test

Dynamic Earthquake Response of 3-DOF Structure with Substructures by Centrifuge Test

Effect of soil on the capacity of viscous dampers between adjacent buildings

A Combined Analytical Method for Intelligent Control of Friction Damped Structures

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