Pounding Dynamic Responses of Sliding Base-Isolated Rectangular Liquid-Storage Structure considering Soil-Structure Interactions

Xuansheng Cheng,Jia Chen,Xiaoyan Zhang,Wei Jing

doi:10.1155/2017/8594051

Xuansheng Cheng, Jia Chen + Show 2 more

Open Access

https://doi.org/10.1155/2017/8594051

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Abstract

The soil-structure interaction (SSI) is simulated by an artificial boundary, the pounding that occurs between the sliding base-isolated rectangular liquid-storage structure (LSS) and the surrounding moat wall is considered, the instantaneous pounding is simulated using the Hertz-damp model, and a simplified mechanical model with two particles and four degrees of freedom is established. Dynamic equation is obtained using Hamilton principle; effects of SSI, initial gap, and friction coefficient on the pounding responses under the action of near-field pulse-like Chi-Chi earthquake and far-field Imperial Valley-06 earthquake are studied. The results show that SSI will amplify liquid sloshing height but that structural acceleration and impact force will be reduced because of SSI. The responses caused by Chi-Chi earthquake are far greater than those of Imperial Valley-06 earthquake. Initial gap has a small effect on liquid sloshing height; structural acceleration and impact force first increase as the initial gap increases and then begin to decrease; in the design of moat wall of sliding isolation LSS, a certain gap exists that will more adversely affect the pounding responses of structure. Liquid sloshing height is less affected by coefficient of friction, but structural acceleration and impact force decrease as friction coefficient increases in general.

Highlights

In lifeline engineering, liquid-storage structures play irreplaceable roles in the development of a national economy, but many earthquakes have caused different degrees of damage to the liquid-storage structures
The foundation effect is not considered in the above studies when the base-isolated structure collides with the moat wall, but the soil-structure interaction (SSI) has a significant effect on the vibrational frequency [19], the system damping ratio and rotational displacement of the foundation [20], the structural dynamic responses [21], and the reasonable choice of the isolation bearing [22] of an isolation structure
By comparing the corresponding energy responses for the actions of the near-field pulse-like Chi-Chi earthquake and far-field Imperial Valley-06 earthquake, we found that EF, EP, and ED corresponding to the Chi-Chi wave are much larger than those of the Imperial Valley-06 wave

Summary

Introduction

Liquid-storage structures play irreplaceable roles in the development of a national economy, but many earthquakes have caused different degrees of damage to the liquid-storage structures. Some new types of sliding isolation methods can achieve independence of the isolation period and liquid sloshing period [5] and avoid the resonance phenomenon, which can reduce both the structural dynamic responses and liquid sloshing simultaneously [6, 7]. The foundation effect is not considered in the above studies when the base-isolated structure collides with the moat wall, but the SSI has a significant effect on the vibrational frequency [19], the system damping ratio and rotational displacement of the foundation [20], the structural dynamic responses [21], and the reasonable choice of the isolation bearing [22] of an isolation structure. The probability of pounding of the sliding base-isolated structure with the moat wall is larger than the rubber isolation, studies on the dynamic responses of a sliding isolation structure that consider the SSI have not been performed. Sliding isolation has a certain advantage in the shock absorption of a liquid-storage structure, and theoretical research on this type of damping method is helpful to its future application

Calculation Model

Pounding Dynamic Responses

Peak Response Analysis

Findings

Conclusions